AD7142ACPZ-500RL7

Overview

The AD7142ACPZ-500RL7 is a programmable capacitance-to-digital converter (CDC) designed for touch sensor applications. It features 14 capacitance sensor input channels routed through a switch matrix to a 16-bit, 250 kHz sigma-delta converter. The device operates on a single supply voltage ranging from 2.6 V to 3.6 V and consumes less than 1 mA in full power mode. It includes an SPI-compatible serial interface, automatic environmental calibration logic, and adaptive threshold levels. The component is housed in a 32-lead, 5 mm × 5 mm LFCSP package.

Feature Summary

• 14-channel capacitance sensing with better than 1 fF resolution
• On-chip automatic calibration for environmental compensation
• SPI-compatible serial interface with separate VDRIVE level
• Integrated interrupt output and general-purpose I/O

Applications

• Personal music and multimedia players
• Cell phones and smart hand-held devices
• Digital still cameras
• Television, A/V, and remote controls
• Gaming consoles

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and reel quantity. Ensure compatibility with the host processor's SPI timing requirements, specifically the maximum clock frequency of 5 MHz. Confirm that the system design accommodates the required 32-lead LFCSP footprint and thermal dissipation characteristics.

Selection Notes

Select this component when high-resolution capacitive touch sensing is required without external tuning components. The AD7142 supports both button and scroll bar/wheel implementations. Consider the AD7142-1 variant if an I2C interface is preferred over SPI. Ensure the application environment remains within the specified -40°C to +85°C operating temperature range.

Part Context

This part belongs to the AD7142 family of capacitance-to-digital converters manufactured by Analog Devices Inc. The AD7142ACPZ-500RL7 specifically denotes the version with an SPI interface in a 32-lead LFCSP package, supplied in a tape and reel configuration. It serves as a complete solution for novel user input methods in portable electronics.

Replacement Considerations

The AD7142-1 is a direct functional substitute offering an I2C-compatible interface instead of SPI. Other members of the AD714x family may offer different channel counts or pin configurations; verify register compatibility and pinout alignment before substitution.