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.