1 Features

1• Small package size:

– 3-mm × 3-mm WQFN

• 8 channels configurable as any combination of:

– Up to 8 analog inputs, digital inputs, or digital

outputs

• GPIOs for I/O expansion:

– Open-drain, push-pull digital outputs

• Analog watchdog:

– Programmable thresholds per channel

– Event counter for transient rejection

• Wide operating ranges:

– AVDD: 2.35 V to 5.5 V

– DVDD: 1.65 V to 5.5 V

– –40°C to +125°C temperature range

• CRC for read/write operations:

– CRC on data read/write

– CRC on power-up configuration

• I2C interface:

– Up to 3.4 MHz (high-speed mode)

– 8 configurable I2C addresses

• Programmable averaging filters:

– Programmable sample size for averaging

– Averaging with internal conversions

– 16-bit resolution for average output

2 Applications

• Automotive center information displays

• Mobile robot CPU boards

• Rack servers

• Intra-DC interconnect (metro)

3 Description

The ADS7138 is an easy-to-use, 8-channel,

multiplexed, 12-bit, successive approximation register

analog-to-digital converter (SAR ADC). The eight

channels can be independently configured as either

analog inputs, digital inputs, or digital outputs. The

device has an internal oscillator for ADC conversion

processes.

The ADS7138 communicates via an I2C-compatible

interface and operates in either autonomous or

single-shot conversion mode. The ADS7138

implements analog watchdog function by eventtriggered

interrupts per channel using a digital

window comparator with programmable high and low

thresholds, hysteresis, and an event counter. The

ADS7138 has a built-in cyclic redundancy check

(CRC) for data read/write operations and the powerup

configuration.