CAP1128 - Electronic component Microchip - Free user manual and instructions
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| Product Type | Capacitive Touch Controller |
| Brand | Microchip |
| Model | CAP1128 |
| Touch Channels | 8 capacitive inputs |
| Communication Interface | I2C (up to 400 kHz) |
| Supply Voltage | 2.7V to 3.6V (3.3V typical) |
| Active Current | 1 mA typical (all channels scanning) |
| Standby Current | 50 µA typical |
| Package | 16-pin QFN (4x4 mm) |
| Dimensions | 4.0 x 4.0 x 0.75 mm |
| Weight | 0.05 g (approximately) |
| Operating Temperature | -40°C to +85°C |
| Touch Sensitivity | Configurable via I2C registers |
| LED Drivers | 8 open-drain LED drivers |
| Interrupt Output | Active-low open-drain output |
| Power Modes | Active, Standby, and Sleep modes |
| Pattern Recognition | Supports tap, double-tap, and hold gestures |
| ESD Protection | Built-in ESD protection on touch inputs |
| Maintenance | Keep PCB surface clean and free of moisture |
| Cleaning | Wipe with a dry, lint-free cloth |
| Safety | Follow ESD-safe handling procedures during installation |
| Spare Parts | None; component is soldered directly onto the PCB |
| Repairability | Only replaceable by qualified technicians with reflow equipment |
| General Information | Designed for user interface applications in industrial and consumer devices |
Frequently Asked Questions - CAP1128 Microchip
How to adjust the touch sensitivity of CAP1128?
The sensitivity is set using the Sensitivity Register (SENS) via I2C. Lower values increase sensitivity. Actual counts are compared to a threshold; we recommend testing your specific overlay.
What is the I2C address of CAP1128?
The default 7-bit address is 0x28, but it can be changed through the I2C Address register and the ADDR pin configuration.
Can CAP1128 detect multitouch gestures?
CAP1128 focuses on individual touch detection and supports up to 8 simultaneous channels, but it does not have a built-in gesture engine. Use a microcontroller to analyze channel patterns.
How to reduce power consumption in battery-powered applications?
Use Sleep mode between measurements and periodically wake to scan. Set the averaging and sampling time to the minimum required. The Standby mode reduces current to ~50 µA.
What PCB layout guidelines should I follow?
Keep touch traces short and guarded. Place ground fill around each channel to reduce crosstalk. The sense electrode should be on the top layer with a ground plane underneath.
How to calibrate the sensor for a specific overlay material?
You can adjust the compensation values and set the base count through the registers. Microchip provides software libraries for automatic calibration.
Does CAP1128 support interrupt on touch?
Yes, the INT pin goes low when a touch event is detected. Configure the interrupt mask and enable it in the Interrupt Enable register.
Can I mount two CAP1128 devices on the same I2C bus?
Yes, use different I2C addresses for each. The ADDR pin allows several addresses (e.g., 0x28, 0x29, 0x2A, etc.) to avoid conflicts.
What is the typical response time for a touch?
With a fast scan rate, response time can be as low as 10 ms. It depends on the number of channels and the sampling settings.
How to handle the device during soldering?
The CAP1128 is sensitive to ESD; use grounded soldering equipment and a reflow profile compliant with JEDEC standards. Ensure temperature does not exceed 260°C peak.
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USER MANUAL CAP1128 Microchip
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Product information
Brand : Microchip
Model : CAP1128
Category : Electronic component