AD7147ACPZ-500RL7

Overview

The AD7147ACPZ-500RL7 is a CapTouch programmable controller for single-electrode capacitance sensors, manufactured by Analog Devices Inc. It integrates a 16-bit, 250 kHz sigma-delta capacitance-to-digital converter (CDC) with 13 sensor inputs. The device operates on a 2.6 V to 3.6 V supply and features an SPI-compatible serial interface. Key specifications include a 9 ms update rate for all inputs, femtofarad resolution, and low power consumption of 21.5 μA in low power mode. It includes on-chip automatic calibration logic and adaptive threshold levels to compensate for environmental changes.

Feature Summary

• Integrated 16-bit capacitance-to-digital converter with 13 sensor inputs
• SPI-compatible serial interface with separate VDRIVE level
• On-chip automatic calibration and adaptive threshold logic
• Low operating current: 1 mA full power, 21.5 μA low power mode

Applications

• Cell phones
• Personal music and multimedia players
• Smart handheld devices
• Television, A/V, and remote controls
• Gaming consoles

Procurement Notes

Verify the specific ordering suffix RL7 corresponds to reel packaging quantities when sourcing. Confirm that the component meets RoHS compliance requirements for the intended market. Ensure the LFCSP-24 package dimensions align with the PCB footprint design guidelines provided in the datasheet.

Selection Notes

Select this model for applications requiring SPI communication; note that the AD7147-1 variant offers I2C compatibility. Consider the 2.6 V to 3.6 V supply range and the 21.5 μA low power mode for battery-operated devices. Ensure the host processor can handle the required software algorithms for high-resolution sensors like scroll bars.

Part Context

This component belongs to the AD7147 series of CapTouch controllers. It is designed to replace mechanical switches with capacitive sensing solutions. The register map is compatible with the AD7142, facilitating migration from previous generations. It supports functions such as buttons, scroll bars, and wheels using single-layer PCB electrodes.

Replacement Considerations

The AD7147-1ACPZ-500RL7 serves as a functional substitute if I2C interface compatibility is required instead of SPI. Both parts share identical pinouts and core CDC functionality within the same LFCSP-24 package.