CAP1203-1-SN-TR

Overview

The CAP1203-1-SN-TR is a three-channel capacitive touch sensor controller manufactured by Microchip Technology. It operates on a supply voltage of 3V to 5.5V and draws typical quiescent current of 5µA in Deep Sleep mode. The device features SMBus/I2C communication interfaces, supports multiple pattern touch recognition, and includes automatic recalibration for parasitic capacitance. It is housed in an 8-pin SOIC package with an operating temperature range of -40°C to 125°C.

Feature Summary

• Three individual capacitive touch sensor inputs with programmable sensitivity and automatic recalibration capabilities.
• Supports Multiple Pattern Touch recognition allowing simultaneous button detection with interrupt generation.
• Includes low power operation modes such as Active, Standby, and Deep Sleep with specific current consumption profiles.
• Features analog filtering for system noise, RF detection avoidance filters, and digital EMI blocker.

Applications

• Desktop and Notebook PCs
• LCD Monitors
• Consumer Electronics
• Appliances

Procurement Notes

Verify the ordering suffix SN indicates the 8-pin SOIC package variant rather than TDFN. Confirm RoHS compliance status matches project requirements. Ensure host controller supports SMBus or I2C protocols compatible with the device's address configuration. Check that pull-up resistors are correctly sized for the bus capacitance limits specified in the datasheet.

Selection Notes

Select this component when a three-channel solution with pattern detection is required. Consider the SOIC package for through-hole or standard surface mount assembly needs. Evaluate power constraints against the 5µA Deep Sleep current if battery operation is critical. Verify interface compatibility with the host microcontroller's available SMBus or I2C ports.

Part Context

This part belongs to the CAP1203 family of capacitive touch sensor controllers from Microchip Technology. It shares core functionality with other variants like the CAP1203-1-AC3-TR but differs in packaging. The family is designed for embedded touch applications requiring low power and robust noise immunity.

Replacement Considerations

Direct replacements include other CAP1203 variants with different packages, such as CAP1203-1-AC3-TR (TDFN). Ensure pinout compatibility and software register mapping remain identical when substituting package types within the same functional family.

FAQ

What is the maximum clock frequency supported by the CAP1203?

The CAP1203 supports I2C fast mode at 400 kHz and SMBus communications down to 10 kHz.

How does the device handle environmental changes affecting touch sensitivity?

Each sensor input is calibrated to compensate for system parasitic capacitance and automatically recalibrates to compensate for gradual environmental changes.

Can the CAP1203 detect multiple buttons being pressed simultaneously?

Yes, it includes Multiple Pattern Touch recognition that allows users to select a specific set of buttons to be touched simultaneously, generating an interrupt if detected.