AD7147PACPZ-500R7

Overview

The AD7147PACPZ-500R7 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 features on-chip environmental calibration logic and automatic adaptive thresholds to compensate for ambient changes. It operates on a 2.6 V to 3.6 V supply with full power consumption of 1 mA and low power mode current as low as 21.5 μA. Communication is handled via an SPI-compatible serial interface with a separate VDRIVE level. The component is housed in a 24-lead, 4 mm × 4 mm LFCSP package.

Feature Summary

• 13 capacitance sensor inputs with femtofarad resolution
• On-chip automatic calibration and adaptive threshold logic
• SPI-compatible serial interface with independent VDRIVE voltage level
• Low operating current: 1 mA (full power), 21.5 μA (low power)

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 against the manufacturer's official documentation to confirm package type and automotive qualification status. Ensure that the VDRIVE pin voltage requirements are met for the target serial interface logic levels. Confirm that the host processor supports the required SPI timing specifications before integration.

Selection Notes

Select this component for applications requiring high-resolution capacitive sensing with minimal external components. The AD7147 supports buttons, scroll bars, and wheels using only a single PCB layer for sensors. Consider the AD7147-1 if an I2C interface is preferred over SPI. Ensure the design accommodates the 24-lead LFCSP footprint and provides adequate thermal dissipation for the exposed pad.

Part Context

The AD7147 is part of the Analog Devices CapTouch family, designed specifically for single-electrode capacitance sensing. It is functionally compatible with the AD7142 register map, facilitating migration from older designs. The device eliminates the need for external RC components and provides a complete solution for novel user input methods in portable electronics.

Replacement Considerations

The AD7147-1 serves as a direct functional alternative with an I2C-compatible interface instead of SPI. Both parts share the same package, pinout, and core CDC functionality. Verify interface compatibility with the host microcontroller when selecting between these variants.