Analog Devices Inc. AD7879-1WARUZ-RL

Overview

AD7879-1WARUZ-RL from Analog Devices is a 12-bit SAR ADC touch screen controller with integrated 4-wire resistive touch interface, I²C serial interface, and auxiliary analog input/battery monitor. It operates from 1.6 V to 3.6 V, delivers 105 kSPS throughput, supports touch-pressure and temperature measurement, and is used in smart handheld devices and point-of-sale terminals.

For engineers reviewing the AD7879-1WARUZ-RL datasheet, AD7879-1WARUZ-RL pinout, AD7879-1WARUZ-RL application, or AD7879-1WARUZ-RL equivalent, key selection criteria include I²C compatibility, WLCSP package footprint (1.6 mm × 2 mm, 12-ball), programmable median/averaging filters, PENIRQ/INT/DAV interrupt functionality, and 6 µA shutdown current.

Technical Context

The AD7879-1WARUZ-RL implements a synchronous 12-bit successive approximation ADC with integrated 6-to-1 analog multiplexer, on-chip track-and-hold, and dual 3-to-1 reference MUX. It features an automatic conversion sequencer and timer that triggers on pen-down events or periodic intervals.

Its preprocessing block includes user-programmable median and averaging filters (up to 16 samples), variable acquisition time, and first-conversion delay - all configurable via I²C registers. The device supports three interrupt modes (PENIRQ, INT, DAV) on a single multifunction pin and provides dedicated X+, X−, Y+, Y− switch drivers with on-resistance ≤6 Ω.

Key Specifications

Pinout & Package

AD7879-1WARUZ-RL is packaged in a 12-ball, 1.6 mm × 2 mm wafer-level chip-scale package (WLCSP) with bottom-side ball layout. The exposed pad is not internally connected but must be soldered to PCB ground for thermal and mechanical reliability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar touch screen controller applications.

Compared with AD7879-1WARUZ-RL, AD7879WARUZ-RL offers identical analog performance but requires SPI infrastructure, while TSC2007IPWR lacks temperature sensing and occupies more PCB area - making AD7879-1WARUZ-RL optimal for space-constrained, thermally aware I²C-based touch systems.

Availability

AD7879-1WARUZ-RL is available at Aetrix Electronics and suitable for smart handheld devices, point-of-sale terminals, and medical handhelds requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AD7879-1WARUZ-RL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7879/AD7889 product line was designed specifically for low-power, high-accuracy resistive touch screen digitization in battery-operated portable electronics - integrating ADC, switch drivers, filtering, and I²C/SPI interfaces into a single compact package.

FAQ

What interface protocol does the AD7879-1WARUZ-RL support?

The AD7879-1WARUZ-RL supports I²C communication at up to 400 kHz. It uses SDA and SCL pins for bidirectional data transfer and ADD0/ADD1 pins to configure its 7-bit slave address. Unlike the SPI variant AD7879WARUZ-RL, the AD7879-1WARUZ-RL does not support SPI mode - its interface is fixed to I²C per the -1 suffix designation in the part number.

Does the AD7879-1WARUZ-RL include an integrated temperature sensor?

Yes, the AD7879-1WARUZ-RL includes an on-chip temperature sensor with ±2°C accuracy over −40°C to +85°C, calibrated at 25°C. Temperature readings are acquired through the same 12-bit SAR ADC and stored in dedicated result registers. This feature enables thermal compensation of touch coordinates or system-level thermal monitoring without external sensors.

What is the shutdown current specification for the AD7879-1WARUZ-RL?

The AD7879-1WARUZ-RL draws ≤6 µA in shutdown mode (PM = 00), as specified in the Rev. D datasheet under Power Requirements. This ultra-low quiescent current is achieved by disabling the ADC, reference, oscillator, and analog switches while retaining register state - making it ideal for battery-powered devices requiring long standby duration.

Can the AUX/VBAT/GPIO pin on the AD7879-1WARUZ-RL be used simultaneously for battery monitoring and GPIO functions?

No - the AUX/VBAT/GPIO pin on the AD7879-1WARUZ-RL is software-configurable for only one function at a time: auxiliary analog input (0.5–5 V), battery voltage monitoring, or general-purpose digital I/O. Configuration is controlled via Control Register 1 (bit 11). Simultaneous use is not supported due to shared analog front-end and digital buffer circuitry.

What package type and dimensions does the AD7879-1WARUZ-RL use?

The AD7879-1WARUZ-RL uses a 12-ball, 1.6 mm × 2 mm wafer-level chip-scale package (WLCSP) with ball pitch of 0.4 mm. The package marking "WARUZ" denotes this WLCSP variant; the "-RL" suffix indicates tape-and-reel packaging. The exposed pad is not internally connected but must be soldered to PCB ground for thermal and mechanical stability.