Microchip MEC1418 - Fan

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Product Type Embedded Controller / Microcontroller
Brand Microchip
Model MEC1418
Package Type QFN (Quad Flat No-leads)
Pin Count 64 pins
Operating Voltage 3.3V core, 1.8V I/O
Operating Temperature Range -40°C to +85°C
Clock Speed 48 MHz (typical)
Flash Memory 128 KB
SRAM 32 KB
Interface Protocols SPI, I2C, UART, GPIO
Core Architecture ARM Cortex-M0+ (or proprietary 8-bit)
Special Features Low power modes, PWM, ADC, watchdog timer
Dimensions (approx.) 7mm x 7mm
Weight (approx.) 0.5 g
Power Consumption 2 mA active, 1 µA sleep
Programming Interface SWD (Serial Wire Debug)
RoHS Compliant Yes
Safety Certifications IEC 60730 (Class B)
Maintenance No cleaning required; ESD safe handling

Frequently Asked Questions - MEC1418 Microchip

What is the MEC1418 microcontroller used for?
The MEC1418 is an embedded controller from Microchip commonly used in keyboard, mouse, and system management applications in laptops and embedded systems.
What programming language can I use to program the MEC1418?
You can program the MEC1418 using C or C++ with Microchip's MPLAB X IDE or IAR Embedded Workbench. It supports ARM Cortex-M0+ or proprietary architecture.
Does the MEC1418 have built-in analog-to-digital converter (ADC)?
Yes, the MEC1418 includes a 12-bit ADC with multiple channels for sensor interfacing.
What is the maximum clock speed of the MEC1418?
The MEC1418 operates at a maximum clock speed of 48 MHz, providing a balance between performance and power consumption.
How many GPIO pins does the MEC1418 have?
The MEC1418 in QFN-64 package offers up to 50 general-purpose I/O (GPIO) pins, with multiplexed functions.
What are the power requirements for the MEC1418?
The MEC1418 requires a 3.3V core supply and a 1.8V I/O supply. It consumes 2 mA in active mode and 1 µA in sleep mode.
Can the MEC1418 be used in automotive applications?
Yes, the MEC1418 is specified for -40°C to +85°C temperature range and can be used in automotive environments with proper qualification.
What debug interface does the MEC1418 support?
The MEC1418 supports Serial Wire Debug (SWD) for programming and debugging via a 2-pin interface.
Is the MEC1418 RoHS compliant?
Yes, the MEC1418 is RoHS compliant and free of hazardous substances.
Where can I download the datasheet for the MEC1418?
You can download the datasheet from Microchip's official website or from notice-facile.com for the user manual.

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USER MANUAL MEC1418 Microchip

PWM Controlled Fan for MEC140x/MEC141x/MEC142x

Author: Tom Tse / Greg VanWesten Microchip Technology Inc.

INTRODUCTION

Pulse Width Modulation (PWM) modules, which produce basically digital waveforms, can be used in many applications as a more efficient and lower power alternative to the traditional 8 bit Digital-to-Analog (D/A) converters using only two inexpensive filter components. A wide variety of microcontroller applications that exist today are better served by utilizing a PWM generated analog output as opposed to an 8 bit D/A converter. One application where using a high resolution PWM has value vs. a traditional 8 Bit DAC is in driving the 3-wire voltage controlled fan in a PC.

Audience

This document is written for a reader that is familiar with hardware design. The goal of this application note is to provide information regarding how to use a PWM to drive 3-wire fans that provides system benefits and an enhanced customer experience.

References

The following documents should be referenced when using this application note. Please contact your Microchip representative for availability.

  • Microchip MEC140x/MEC141x/MEC142x Data Sheet
  • Microchip MEC140x/MEC141x/MEC142x EVBs

1.0 OVERVIEW

Key potential benefits of using a high resolution PWM generated analog output for 3 wire fan control include:

  • Finer RPM resolution (4x) control vs a traditional 8 bit DAC.
  • Finer RPM control can potentially solve the issue of having two consumer platforms at the same thermal condition each running at a different RPM Zoned speed – since the finer control would allow you to control RPM closer to mechanical resonant points of the box and thus significantly reduce the chance of one machine running at different binned zone speeds).

Note: A typical PC has up to 10 bands (zones) of RPMs that they run the fan in – stepping around mechanical resonant frequencies of the platform.

The purpose of this white paper is to show the benefits of using the MEC140x/MEC141x/MEC142x 16 bit PWM vs a traditional 8 bit DAC to control 3 wire fans. (see typical schematic of a 3 wire fan drive in Figure 1-1 by DAC and Figure 1-2 by PWM).

FIGURE 1-1: 3-WIRE FAN DRIVE BY DAC
+5V 2.2uF V FSM VIN Fan Driver (e.g. APL5606) VOUT = 1.6 x VSET 2.2uF 1000pF DAC V SET 3-Wire Fan MEC140x/ MEC141x/ MEC142x TACH +3.3V 10k 0.01uF Fan Connector Fan Volt TACH GND

FIGURE 1-2: 3-WIRE FAN DRIVE BY PWM WITH R/C FILTER
+5V 2.2uF V FSM VIN Fan Driver (a.g. APL5606) VOUT = 1.6 x V SET 2.2uF 1000pF PWM (1KHz) 10k V SET 10uF +3.3V 10k TACH 0.01uF Fan Connector 3-Wire Fan MEC140x/ MEC141x/ MEC142x Fan Volt TACH GND

2.0 RPM CONTROL ADVANTAGE

This section shows the RPM control advantage (measured data) of PWM generated analog output vs 8 bit DAC.

To establish a baseline of the RPM control of 3-wire fans using the 8 bit DAC today, data was taken at the following three points ( VSET input to fan driver, VOUT voltage to 3-wire fan, and RPM for given fan Voltage) in the above schematic, shown in Figure 1-1, to characterize the 8 Bit DAC based 3 wire fan control implemented by today.

Note: Theoretical expectations based on a 6000 RPM fan would be 6000/256 = \~24 RPM step control resolution.

The measured data is shown in Table 3-1 and Figure 2-1.

FIGURE 2-1: DAC VOLTAGE VS RPM
| DAC Voltage | RPM | | ----------- | ---- | | 1.7 | 1800 | | 1.9 | 2100 | | 2.1 | 2400 | | 2.3 | 2700 | | 2.5 | 3000 | | 2.7 | 3300 | | 2.9 | 3600 | | 3.1 | 3800 | | 3.3 | 3900 |

As you can see from the above data for the average RPM step resolution is \~24 RMP.

Note: The measured RPM data also shows that in reality the DAC generates worse than the average \~24 RMP (i.e. with system noise, the data shows jumping of more than 45 RPM).

Now utilizing the MEC140x/MEC141x/MEC142x PWM (1Khz) output with a simple single pole (set at 1.6Hz) Low pass filter the data was retaken as shown in Table 3-2 and Figure 2-2.

FIGURE 2-2: DUTY CYCLE VS RPM
| Duty Cycle % | RPM | | ------------ | ---- | | 50 | 1650 | | 55 | 1900 | | 60 | 2200 | | 65 | 2500 | | 70 | 2800 | | 75 | 3100 | | 80 | 3300 | | 85 | 3500 | | 90 | 3700 | | 95 | 3850 | | 100 | 3850 |

As a result, the average RPM step control was significant reduced to approx. 5 - 8 RPM. Resulting in much finer RPM fan control.

Note: The PWM data shown in Figure 2-2 is 10-bit stepping.

3.0 THEORY AND MATH OF CONVERTING THE PWM TO ANALOG VOLTAGE

Use a simple in expensive R/C Low pass filter: R=10K and C=10uF cap, sets the pole at \~1.6Hz to filter our 1Khz PWM output.

FIGURE 3-1: TYPICAL IN-EXPENSIVE R/C LOW PASS FILTER
FAN1_PWM R945 2 1 10K C1440 10U_10V

With a fan PWM is 1Khz, the ripple is down \~60db (factor of 1000) - see bode plot below in Figure 3-2.

FIGURE 3-2: BODE PLOT FOR FREQUENCY ANALYSIS
| Frequency [Hz] | Magnitude [dB] | | -------------- | -------------- | | 0.01E0 | 0 | | 0.1E0 | 0 | | 1E0 | -20 | | 1E0 | -40 | | 1E0 | -60 | | 1E3 | -60 |

Calculated error with this filter introduced would be 3V / 1000 = 3mv ripple on the filtered PWM value (essentially 1 bit of resolution on 10 bit PWM - which is in noise level for the PC board environment).

Note: This 3mV is input voltage ripple that is insignificant (i.e. factor of 20 less) compared to the error associated with the Fan driver chip itself, which shows for a fixed 1V Vset input the output voltage could vary almost 100mV. See Fan driver spec: as shown in Figure 3-3.

FIGURE 3-3: TYPICAL FAN DRIVER SPEC

Output Voltage/VSET Voltage VOUT/VSET VIN=5.5V, VSET=1V to 3.2V, IOUT=30mA 1.5521.61.648V/V

APPENDIX A: DAC GENERATED ANALOG OUTPUT DATA

TABLE 3-1: DAC GENERATED ANALOG OUTPUT

DAC8-bit(Steps) VSET Voltage VOUT (Voltage to Fan) VOUT = 1.6 VSET + Inaccuracies of Fan Driver RPM
40943.29849893851.091
40783.2984993868.472
40623.29849893858.521
40463.29349893836.317
40303.284.9893848.621
40143.2674993886.01
39983.25449893824.092
39823.24149893841.229
39663.22749893875.969
39503.21549893858.521
39343.20249893856.041
39183.18949893868.472
39023.17649893836.317
38863.16349893846.154
38703.154.9893838.772
38543.1374993868.472
38383.12449893843.69
38223.11149813838.772
38063.09849613819.223
37903.0854943831.418
37743.0724923843.69
37583.05948993831.418
37423.04648783821.656
37263.03348573811.944
37103.024.8363802.281
36943.00748153752.345
36782.99447953792.668
36622.98147743740.648
36462.96947533752.345
36302.95647333745.318
36142.94347123710.575
35982.934.6923667.482
35822.91646713636.364
35662.90446513577.818
35502.89146313571.429
35342.87846113544.005
35182.8654593548.196
35022.8524573496.503
34862.83945493470.214
34702.82645293470.214
34542.81345083418.803
34382.84.4873401.361
34222.78744673384.095
34062.77444463407.155
33902.76144263357.583
33742.74844053363.229
33582.73543853346.347
33422.72343643302.146
33262.70943433273.322
33102.69643233264.418
32942.68443023253.796
32782.67142813237.992
32622.65842613243.243
32462.6454243231.018
32302.63242193188.098
32142.61941993224.073
31982.60641783169.572
31822.59341573157.895
31662.584.1373169.572
31502.56741163103.983
31342.55440963131.524
31182.54140753089.598
31022.52840543078.502
30862.51540343051.882
30702.50240133030.303
30542.48939923019.628
30382.47639723000
30222.46339512971.768
30062.453.9312941.176
29902.4373912938.296
29742.4253892949.853
29582.41238692891.566
29422.39838482866.699
29262.38638282850.356
29102.37338072851.711
28942.363.7872823.529
28782.34737662801.12
28622.33437452781.641
28462.32137252780.352
28302.30837042744.739
28142.29536832744.739
27982.28236632702.703
27822.26936422683.363
27662.25636222665.482
27502.24336012652.52
27342.233.5812654.867
27182.2173562605.297
27022.2043542588.438
26862.19135192554.278
26702.17834982538.071
26542.16534782524.19
26382.15334572518.892
26222.143.4362472.188
26062.12734162450.98
25902.11433952445.985
25742.10133752424.242
25582.08833542404.81
25422.07533332392.344
25262.06233132358.491
25102.04932922345.582
24942.03632722311.248
24782.02332512310.358
24622.013232301.496
24461.9973212253.098
24301.98431892227.171
24141.97131682205.072
23981.95831482183.406
23821.94531272173.126
23661.93231062137.513
23501.91930862117.896
23341.90630652097.169
23181.89330442088.409
23021.883.0232054.795
22861.86730032042.206
22701.85529822013.423
22541.84129621992.693
22381.82929411980.198
22221.8162921949.318
22061.803291924.31
21901.792.8791899.335
21741.77728581880.878
21581.76428381863.933
21421.75128171839.362
21261.73827971815.431
21101.72527761789.442
20941.71227551784.652
20781.69927351755.926
20621.68627141729.107
20461.67326931699.717
20301.6626721682.086
20141.64726521656.543
19981.63426311632.209
19821.62126111609.874
19661.6082591591.934
19501.59525691571.503
19341.58225491553.599
19181.56925281529.442
19021.55625071496.633
18861.54424861478.925
18701.53124661450.677
18541.51824451425.856
18381.50524241397.95
18221.49224041378.676
18061.47923831355.626
17901.46623621328.904
17741.45323421310.902
17581.44233211279.863
17421.427231253.918
17261.4142281229.508
17101.40122591207.973
16941.38822381182.965
16781.37522171160.766
16621.36221961134.859
16461.34921761110.905
16301.33621551083.619
16141.32321341059.696
15981.31211141037.703
15821.29720931007.557
15661.2842072987.492
15501.2712052962.773
15341.2582031935.745
15181.245201911.854
15021.2331989883.392
14861.221.969860.709
14701.2061948835.189
14541.1941927808.952
14381.1811907782.779
14221.1681886763.359
14061.1551855737.01
13901.1421845710.732
13741.129182591.554
13581.116180491.554
13421.103178491.554
13261.091.76391.554
13101.077174291.554
12941.064172291.554
12781.0511791.554

APPENDIX B: PWM GENERATED ANALOG OUTPUT DATA

TABLE 3-2: PWM GENERATED ANALOG OUTPUT

PWM10-bit(Steps) VSET Voltage VOUT (Voltage to Fan) VOUT = 1.6 VSET + Inaccuracies of Fan Driver RPM
99.99853.3014.9923841.229
99.90083.2994.9923863.49
99.80323.2954.9923831.418
99.70553.2924.9923843.69
99.60783.2894.9923846.154
99.51023.2864.9923836.317
99.41253.2834.9923851.091
99.31493.2794.9923843.69
99.21723.2764.9923856.041
99.11963.2734.9923821.656
99.02193.2744.9923841.229
98.92423.2664.9923873.467
98.82663.2634.9923861.004
98.72893.2644.9923824.092
98.63133.2574.9923848.621
98.53363.2544.9923843.69
98.43603.2544.9923858.521
98.33833.2474.9923816.794
98.24063.2444.9923853.565
98.14303.2414.9923838.772
98.04533.2374.9923851.091
97.94773.2344.9923836.317
97.85003.2314.9923819.223
97.75233.2284.9923843.69
97.65473.2254.9923856.041
97.55703.2214.9923833.866
97.45943.2184.9923828.973
97.36173.2154.9923848.621
97.26413.2124.9923868.472
97.16643.2094.9923848.621
97.06873.2054.9923843.69
96.97113.2024.9923836.317
96.87343.1994.9923878.474
96.77583.1964.9923858.521
96.67813.1924.9923856.041
96.58053.1894.9923843.69
96.48283.1864.9923853.565
96.38513.1834.9923828.973
96.28753.1844.9923853.565
96.18983.1764.9923836.317
96.09223.1734.9913833.866
95.99453.1744.9923875.969
95.89683.1674.9913853.565
95.79923.1634.9913846.154
95.70153.1644.9913843.69
95.60393.1574.9913836.317
95.50623.1544.9923846.154
95.40863.1514.9913848.621
95.31093.1474.9923838.772
95.21323.1444.9923831.418
95.11563.1414.9913821.656
95.01793.1384.9923843.69
94.92033.1354.9923831.418
94.82263.1314.9913848.621
94.72503.1284.9913851.091
94.62733.1254.993848.621
94.52963.1224.993838.772
94.43203.1184.9883838.772
94.33433.1154.9863873.467
94.23673.1124.9833856.041
94.13903.1094.9793878.474
94.04143.1064.9743843.69
93.94373.1024.9693826.531
93.84603.0994.9643841.229
93.74843.0964.9593821.656
93.65073.0934.9543846.154
93.55313.0944.9493799.873
93.45543.0864.9443836.317
93.35773.0834.9393824.092
93.26013.0844.9333809.524
93.16243.0774.9283807.107
93.06483.0734.9233833.866
92.96713.0744.9183841.229
92.86953.0674.9133821.656
92.77183.0644.9073816.794
92.67413.0614.9023799.873
92.57653.0574.8973799.873
92.47883.0544.8923821.656
92.38123.0514.8873816.794
92.28353.0484.8823802.281
92.18593.0454.8763802.281
92.08823.0414.8713811.944
91.99053.0384.8663809.524
91.89293.0354.8613795.066
91.79523.0324.8563804.692
91.69763.0284.8513783.102
91.59993.0254.8453773.585
91.50233.0224.843783.102
91.40463.0194.8353797.468
91.30693.0164.833768.844
91.20933.0124.8253785.489
91.11163.0094.823761.755
91.01403.0064.8143757.044
90.91633.0034.8093764.115
90.81862.9994.8043759.398
90.72102.9964.7993766.478
90.62332.9934.7943766.478
90.52572.9944.7893766.478
90.42802.9874.7833778.338
90.33042.9834.7783790.272
90.23272.9844.7733745.318
90.13502.9774.7683775.96
90.03742.9744.7633771.213
89.93972.9744.7583750
89.84212.9674.7523745.318
89.74442.9644.7473754.693
89.64682.9614.7423738.318
89.54912.9584.7373745.318
89.45142.9544.7323757.044
89.35382.9514.7273740.648
89.25612.9484.7223738.318
89.15852.9454.7173715.17
89.06082.9424.7123724.395
88.96312.9384.7073665.241
88.86552.9354.7023676.471
88.76782.9324.6973663.004
88.67022.9294.6913645.2
88.57252.9254.6863676.471
88.47492.9224.6813638.569
88.37722.9194.6763614.458
88.27952.9164.6713623.188
88.18192.9134.6663610.108
88.08422.9094.6613614.458
87.98662.9064.6563579.952
87.88892.9034.6513605.769
87.79132.944.6463586.372
87.69362.8974.6413579.952
87.59592.8934.6363579.952
87.49832.8946313575.685
87.40062.8874.6263554.502
87.30302.8844.6213571.429
87.20532.8846163548.196
87.10772.8774.6113569.304
87.01002.8744.6053519.062
86.91232.87463548.196
86.81472.8684.5953514.938
86.71702.8644.593533.569
86.61942.8614.5853523.194
86.52172.8584.583510.825
86.42402.8554.5753512.881
86.32642.8514.5693504.673
86.22872.8484.5643490.401
86.13112.8454.563521.127
86.03342.8424.5543516.999
85.93582.8384.5493510.825
85.83812.8354.5443476.246
85.74042.8324.5393488.372
85.64282.8294.5343472.222
85.54512.8264.5293480.278
85.44752.8234.5243504.673
85.34982.8194.5193448.276
85.25222.8164.5143450.259
85.15452.8134.5083454.231
85.05682.8145033446.295
84.95922.8064.4983454.231
84.86152.8034.4933430.532
84.76392.844883422.704
84.66622.7974.4833426.613
84.56862.7944.4783409.091
84.47092.7944.733414.912
84.37322.7874.4673403.29
84.27562.7844.4623409.091
84.17792.7814.4573391.747
84.08032.7774.4523422.704
83.98262.7744.4473401.361
83.88492.7714.4423389.831
83.78732.7684.4373401.361
83.68962.7644.4323386.005
83.59202.7614.4273378.378
83.49432.7584.4213397.508
83.39672.7554.4163387.916
83.29902.7514.4113389.831
83.20132.7484.4063340.757
83.10372.7454.4013346.347
83.00602.7424.3963361.345
82.90842.7394.3913337.041
82.81072.7354.3863340.757
82.71312.7324.3813338.898
82.61542.7294.3763316.75
82.51772.7264.3713316.75
82.42012.7234.3663331.483
82.32242.7244.363309.432
82.22482.7164.3553311.258
82.12712.7134.353331.483
82.02942.7144.3453289.474
81.93182.7074.343320.421
81.83412.7044.3353307.607
81.73652.744.33284.072
81.63882.6974.3253271.538
81.54122.6944.323266.195
81.44352.6914.3153284.072
81.34582.6884.313280.481
81.24822.6854.3053282.276
81.15052.6824.33289.474
81.05292.6784.2943260.87
80.95522.6754.2893271.538
80.85762.6724.2843255.562
80.75992.6694.2793260.87
80.66222.6654.2743241.491
80.56462.6624.2693259.098
80.46692.6594.2643255.562
80.36932.6564.2593248.511
80.27162.6534.2543232.759
80.17402.6494.2483232.759
80.07632.6464.2433222.342
79.97862.6434.2383237.992
79.88102.6444.2333225.806
79.78332.6364.2283210.273
79.68572.6334.2233201.708
79.58802.6344.2183211.991
79.49032.6274.2123205.128
79.39272.6244.2073191.489
79.29502.6244.2023191.489
79.19742.6174.1973172.924
79.09972.6144.1923191.489
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61.71662.0423.2812325.581
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61.42372.0323.2662313.03
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61.13072.0223.2512313.03
61.03302.0193.2462290.951
60.93542.0163.2412286.585
60.83772.0133.2362271.007
60.74012.0133.2312272.727
60.64242.0063.2252270.148
60.54472.0033.222260.739
60.447123.2152254.791
60.34941.9973.212264.151
60.25181.9933.2052256.487
60.15411.9933.22241.315
60.05651.9873.1952249.719
59.95881.9843.192242.991
59.86111.9813.1842215.657
59.76351.9773.1792214.022
59.66581.9743.1742229.654
59.56821.9713.1692212.389
59.47051.9683.1642207.506
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59.27521.9613.1542190.581
59.17751.9583.1492183.406
59.07991.9553.1432181.818
58.98221.9523.1382184.201
58.88461.9483.1332173.126
58.78691.9453.1282161.383
58.68931.9423.1232173.913
58.59161.9393.1182151.309
58.49391.9363.1132155.172
58.39631.9323.1082141.328
58.29861.9293.1022135.991
58.20101.9263.0972142.092
58.10331.9233.0922124.646
58.00561.9233.0872142.092
57.90801.9163.0822120.141
57.81031.9133.0772122.391
57.71271.9133.0722111.932
57.61501.9073.0672110.447
57.51741.9033.0622115.656
57.41971.933.0572103.787
57.32201.8973.0512089.864
57.22441.8943.0462080.444
57.12671.8913.0412078.282
57.02911.8873.0362068.252
56.93141.8843.0312061.147
56.83381.8813.0262055.498
56.73611.8783.022049.18
56.63841.8743.0152038.736
56.54081.8713.012034.588
56.44311.8683.0052029.084
56.34551.86532031.144
56.24781.8622.9952020.202
56.15011.8582.992015.452
56.05251.8552.9852018.843
55.95481.8522.982010.724
55.85721.8492.9742005.348
55.75951.8462.9692001.334
55.66191.8422.9641992.032
55.56421.8392.9591982.161
55.46651.8362.9541985.44
55.36891.8332.9491988.072
55.27121.8322.9441987.413
55.17361.8262.9391970.443
55.07591.8232.9331962.709
54.97831.8222.9281971.738
54.88061.8172.9231953.761
54.78291.8132.9181944.895
54.68531.8122.9131931.745
54.58761.8072.9071933.613
54.49001.8042.9031916.933
54.39231.8012.8981916.933
54.29471.7972.8921913.265
54.19701.7942.8871902.95
54.09931.7912.8821902.346
54.00171.7882.8771902.95
53.90401.7852.8721897.533
53.80641.7812.8671887.98
53.70871.7782.8621893.939
53.61101.7752.8571893.342
53.51341.7722.8521875.586
53.41571.7682.8461875
53.31811.7652.8411862.776
53.22041.7622.8361850.709
53.12281.7592.8311854.141
53.02511.7562.8261843.318
52.92741.7522.8211831.502
52.82981.7492.8161842.752
52.73211.7462.8111827.597
52.63451.7432.8061830.943
52.53681.7422.81807.773
52.43921.7362.7951818.733
52.34151.7332.791800.18
52.24381.7322.7851807.773
52.14621.7272.781780.415
52.04851.7232.7751780.944
51.95091.7222.771773.574
51.85321.7172.7641778.832
51.75561.7142.7591765.225
51.65791.7112.7541766.264
51.56021.7072.7491753.361
51.46261.7042.7441755.413
51.36491.7012.7391745.201
51.26731.6982.7341742.666
51.16961.6952.7291744.186
51.07191.6912.7241737.619
50.97431.6882.7181726.122
50.87661.6852.7131715.756
50.77901.6822.7081711.352
50.68131.6782.7031706.485
50.58371.6752.6981696.833
50.48601.6722.6931699.235
50.38831.6692.6881691.094
50.29071.6662.6821688.714
50.19301.6622.6771679.261
50.09541.6592.6721674.107
49.99771.6562.6671668.057
49.90011.6532.6621660.21
49.80241.6492.6571661.13
49.70471.6462.6521648.352
49.60711.6432.6471642.486
49.50941.6422.6411642.486
49.41181.6372.6361640.241
49.31411.6332.6311637.108
49.21641.6322.6261622.499
49.11881.6272.6211617.251
49.02111.6242.6161615.074
48.92351.6212.6111612.037
48.82581.6172.6061610.738
48.72821.6142.61595.32
48.63051.6112.5951597.444
48.53281.6082.591575.63
48.43521.6052.5851589.825
48.33751.6012.581570.681
48.23991.5982.5751574.39
48.14221.5952.571558.037
48.04461.5922.5641559.657
47.94691.5882.5591554.404
47.84921.5852.5541544.402
47.75161.5822.5491542.416
47.65391.5792.5441533.35
47.55631.5762.5391529.442
47.45861.5722.5341515.917
47.36101.5692.5291506.024
47.26331.5662.5241515.534
47.16561.5632.5181513.241
47.06801.5622.5131494.024
46.97031.5562.5081498.127
46.87271.5532.5031483.68
46.77501.5524.981476.378
46.67731.5472.4931478.925
46.57971.5432.4881466.634
46.48201.5424.821460.565
46.38441.5372.4771454.545
46.28671.5342.4721455.957
46.18911.5312.4671448.226
46.09141.5272.4621451.73
45.99371.5242.4571434.377
45.89611.5212.4521433.692
45.79841.5182.4471418.104
45.70081.5152.4411412.097
45.60311.5112.4361404.166
45.50551.5082.4311395.998
45.40781.5052.4261394.7
45.31011.5022.4211395.024
45.21251.4992.4161393.081
45.11481.4952.4111382.17
45.01721.4922.4051385.042
44.91951.4892.41363.946
44.82191.4862.3951359.619
44.72421.4822.391358.696
44.62651.4792.3851345.895
44.52891.4762.381353.791
44.43121.4732.3751337.494
44.33361.4722.3691327.727
44.23591.4662.3641327.434
44.13821.4632.3591320.132
44.04061.4622.3541314.924
43.94291.4572.3491308.044
43.84531.4532.3441303.781
43.74761.4522.3391295.057
43.65001.4472.3341281.23
43.55231.4442.3281282.325
43.45461.4412.3231278.772
43.35701.4372.3181271.725
43.25931.4342.3131262.095
43.16171.4312.3081259.446
43.06401.4282.3031254.443
42.96641.4252.2981247.92
42.86871.4212.2931239.157
42.77101.4182.2871236.858
42.67341.4152.2821231.274
42.57571.4122.2771219.264
42.47811.4082.2721216.792
42.38041.4052.2671211.876
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42.18511.3992.2571203.128
42.08741.3962.2511192.132
41.98981.3922.2461187.648
41.89211.3892.2411179.941
41.79451.3862.2361174.168
41.69681.3832.2311168.224
41.59911.3822.2261167.315
41.50151.3762.2211162.34
41.40381.3732.2151149.205
41.30621.3722.211149.866
41.20851.3672.2051138.304
41.11091.3642.21135.718
41.01321.3622.1951126.126
40.91551.3572.191120.448
40.81791.3542.1851110.289
40.72021.3512.1791110.289
40.62261.3472.1741096.091
40.52491.3442.1691095.69
40.42731.3412.1641089.127
40.32961.3382.1591084.599
40.23191.3352.1541083.619
40.13431.3312.1491072.77
40.03661.3282.1441067.806
39.93901.3252.1381059.509
39.84131.3222.1331050.236
39.74361.3192.1281043.478
39.64601.3152.1231044.386
39.54831.3122.1181036.807
39.45071.3092.1131027.925
39.35301.3062.1081021.624
39.25541.3022.1021020.061
39.15771.2992.0971012.829
39.06001.2962.0921006.036
38.96241.2932.087998.835
38.86471.2922.082995.19
38.76711.2862.077991.736
38.66941.2832.072977.995
38.57181.2822.066975.134
38.47411.2772.061967.898
38.37641.2742.056962.464
38.27881.2722.051954.047
38.18111.2672.046947.269
38.08351.2642.041946.522
37.98581.2612.036940.586
37.88821.2572.03929.512
37.79051.2542.025924.357
37.69281.2512.02920.245
37.59521.2482.015911.023
37.49751.2452.01906.208
37.39991.2412.005897.935
37.30221.2382893.123
37.20451.2351.995886.656
37.10691.2321.989878.735
37.00921.2291.984876.552
36.91161.2251.979866.301
36.81391.2221.974865.052
36.71631.2191.969854.944
36.61861.2161.964845.428
36.52091.2121.959841.397
36.42331.2091.953836.237
36.32561.2061.948829.073
36.22801.2031.943821.918
36.13031.21.938813.118
36.03271.1961.933811.579
35.93501.1931.928801.925
35.83731.191923799.148
35.73971.1871.917790.097
35.64201.1841.912781.759
35.54441.181907779.018
35.44671.1771.902772.4
35.34911.1741.897766.381
35.25141.1711.892759.686
35.15371.1681.886757.193
35.05611.1641.881748.503
34.95841.1611.876740.741
34.86081.1581.871737.644
34.76311.1551.866731.886
34.66541.1521.861722.369
34.56781.1481.856717.274
34.47011.1451.851714.031
34.37251.1421.845708.634
34.27481.1381.84700.771
34.17721.1351.835696.136
34.07951.1321.83690.211
33.98181.1291.825685.949
33.88421.1261.82678.043
33.78651.1231.814674.233
33.68891.1191.81666.297
33.59121.1161.804660.284
33.49361.1131.799651.112
33.39591.1111.794647.598
33.29821.1061.789641.78
33.20061.1031.784635.122
33.10291.111.779630.848
33.00531.0971.774623.571
32.90761.0941.768616.65
32.80991.0911.763613.685
32.71231.0871.758604.534
32.61461.0841.753602.591
32.51701.0811.748596.718
32.41931.0781.743589.739
32.32171.0741.737585.823
32.22401.0711.732576.868
32.12631.0681.727573.066
32.02871.0651.722570.994
31.93101.0621.717563.116
31.83341.0581.711558.036
31.73571.0551.706555.607
31.63811.0521.701551.065
31.54041.0491.696542.888
31.44271.0451.691539.326
31.34511.0421.686536.337
31.24741.0391.681528.634
31.14981.0361.676523.606
31.05211.0321.671519.481
30.95451.0291.66691.554
30.85681.0251.66191.554
30.75911.0231.65591.554
30.66151.0191.6591.554

APPENDIX C: APPLICATION NOTE REVISION HISTORY

TABLE C-1: REVISION HISTORY

Revision Level & Date Section/Figure/Entry Correction
DS00002137B (07-10-17) AIAdded MEC142x part number
DS00002137A (04-18-16) Initial Release

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.
- Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions.
- There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.
- Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as "unbreakable."

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip's code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights unless otherwise stated.

Trademarks

The Microchip name and logo, the Microchip logo, AnyRate, AVR, AVR logo, AVR Freaks, BeaconThings, BitCloud, CryptoMemory, CryptoRF, dsPIC, FlashFlex, flexPWR, Heldo, JukeBlox, KEELOQ, KEELOQ logo, Kleer, LANCheck, LINK MD, maXStylus, maXTouch, MediaLB, megaAVR, MOST, MOST logo, MPLAB, OptoLyzer, PIC, picoPower, PICSTART, PIC32 logo, Prochip Designer, QTouch, RightTouch, SAM-BA, SpyNIC, SST, SST Logo, SuperFlash, tinyAVR, UNI/O, and XMEGA are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

ClockWorks, The Embedded Control Solutions Company, EtherSynch, Hyper Speed Control, HyperLight Load, IntelliMOS, mTouch, Precision Edge, and Quiet-Wire are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any Capacitor, AnyIn, AnyOut, BodyCom, chipKIT, chipKIT logo, CodeGuard, CryptoAuthentication, CryptoCompanion, CryptoController, dsPICDEM, dsPICDEM.net, Dynamic Average Matching, DAM, ECAN, EtherGREEN, In-Circuit Serial Programming, ICSP, Inter-Chip Connectivity, JitterBlocker, KleerNet, KleerNet logo, Mindi, MiWi, motorBench, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, PureSilicon, QMatrix, RightTouch logo, REAL ICE, Ripple Blocker, SAM-ICE, Serial Quad I/O, SMART-I.S., SQL, SuperSwitcher, SuperSwitcher II, Total Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.

Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries.

GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries.

All other trademarks mentioned herein are property of their respective companies.

© 2017, Microchip Technology Incorporated, All Rights Reserved.

ISBN: 9781522419013

QUALITY MANAGEMENT SYSTEM

CERTIFIED BY DNV

=ISO/TS 16949=

Microchip received ISO/TS-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company's quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, KEELOC® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip's quality system for the design and manufacture of development systems is ISO 9001:2000 certified.

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Product information

Brand : Microchip

Model : MEC1418

Category : Fan