Description

The AD7879-1ACPZ-500R7 is a touch screen controller with 12-bit successive approximation analog-to-digital converter (ADC), synchronous serial interface, and low on-resistance switches. It is designed to work with a single 1.6 V to 3.6 V low power supply and has a maximum throughput rate of 105 kSPS. The device features a shutdown mode that reduces its current consumption to less than 6 μA, making it an energy-efficient choice. The AD7879-1ACPZ-500R7 has a WLCSP package that measures 12-ball, 1.6 mm x 2 mm or a LFCSP package that measures 16-lead, 4 mm x 4 mm.

Specifications and features

• 4-wire touch screen interface
• 1.6 V to 3.6 V operation
• Median and averaging filter to reduce noise
• Automatic conversion sequencer and timer
• User-programmable conversion parameters
• Auxiliary analog input/battery monitor (0.5 V to 5 V)
• 1 optional GPIO
• Interrupt outputs (INT, PENIRQ)
• Touch-pressure measurement
• Wake-up on touch function
• Shutdown mode: 6 μA maximum
• 12-ball, 1.6 mm × 2 mm WLCSP
• 16-lead, 4 mm × 4 mm LFCSP

Application Scenarios

The AD7879-1ACPZ-500R7 is commonly used in various devices that require touch screen displays, such as personal digital assistants, smart handheld devices, touch screen monitors, point-of-sale terminals, medical devices, and cell phones.

Comparison

• Low power supply requirement
• Energy efficient with its shutdown mode
• 12-bit successive approximation ADC for accurate data conversion
• Automatic conversion sequencer and timer for convenience
• Supports touch-pressure measurement for additional data capture

• Restricted to use with 4-wire resistive touch screens
• Pin count limited to 12 or 16, which may not be sufficient for applications requiring more input/output ports