AD7877
Info: : PRODUCTION
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AD7877

Touch Screen Controller

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 3
1ku List Price Starting From $2.86
Features
  • 4-wire touch screen interface
  • LCD noise reduction feature (STOPACQ pin)
  • Automatic conversion sequencer and timer
  • User-programmable conversion parameters
  • On-chip temperature sensor: −40°C to +85°C
  • On-chip 2.5 V reference
  • On-chip 8-bit DAC
  • 3 auxiliary analog inputs
  • 1 dedicated and 3 optional GPIOs
  • 3 interrupt outputs
  • 2 direct battery measurement channels (0.5V to 5V)
  • Qualified for automotive applications
  • See Data Sheet for additional features
Additional Details
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The AD7877 is a 12-bit, successive approximation ADC with a synchronous serial interface and low on resistance switches for driving touch screens. The AD7877 operates from a single 2.7 V to 5.25 V power supply (functional operation to 2.2 V), and features throughput rates of 125 kSPS. The AD7877 features direct battery measurement on two inputs, temperature and touch-pressure measurement.

The AD7877 also has an on-board reference of 2.5 V. When not in use, it can be shut down to conserve power. An external reference can also be applied and varied from 1 V to +VCC, with an analog input range of 0 V to VREF. The device includes a shutdown mode that reduces its current consumption to less than 1 μA.

To reduce the effects of noise from LCDs, the acquisition phase of the on-board ADC is controlled via the STOPACQ pin. User-programmable conversion controls include variable acquisition time and first conversion delay. Up to 16 averages can be taken per conversion. There is also an on-board DAC for LCD back-light or contrast control. The AD7877 runs in either slave or master mode using a conversion sequencer and timer. It is ideal for battery-powered systems such as personal digital assistants with resistive touch screens and other portable equipment.

The part is available in a 32-lead lead frame chip scale package (LFCSP), and a 25-ball wafer level chip scale package (WLCSP). AD7877W model is qualified for automotive applications.

APPLICATIONS

  • Personal digital assistants
  • Smart hand-held devices
  • Touch screen monitors
  • Point-of-sale terminals
  • Medical devices
  • Cell phones
  • Pagers
Part Models 3
1ku List Price Starting From $2.86

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
AD7877ACPZ-500RL7
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AD7877ACPZ-REEL7
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AD7877WACPZ-REEL7
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Part Models

Product Lifecycle

PCN

Nov 10, 2014

- 14_0047

Conversion of 5x5mm body Size LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to Amkor Philippines.

Oct 26, 2009

- 09_0202

Inclusion of Banding Tape for LFCSP REEL7 parts.

Aug 25, 2009

- 09_0172

AD7877 Datasheet specification changes

AD7877ACPZ-500RL7

PRODUCTION

AD7877ACPZ-REEL7

PRODUCTION

May 4, 2016

- 14_0178

Conversion of 3x3mm, 4x4mm and 5x5mm LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to Amkor Philippines

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Nov 10, 2014

- 14_0047

arrow down

Conversion of 5x5mm body Size LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to Amkor Philippines.

Oct 26, 2009

- 09_0202

arrow down

Inclusion of Banding Tape for LFCSP REEL7 parts.

Aug 25, 2009

- 09_0172

arrow down

AD7877 Datasheet specification changes

AD7877ACPZ-500RL7

PRODUCTION

AD7877ACPZ-REEL7

PRODUCTION

May 4, 2016

- 14_0178

arrow down

Conversion of 3x3mm, 4x4mm and 5x5mm LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to Amkor Philippines

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