The ADC128D818 I2C system monitor is designed for maximum flexibility. The system monitor can be configured for single-ended and/or pseudo-differential inputs. An onboard temperature sensor, combined with WATCHDOG window comparators, and an interrupt output pin, INT, allow easy monitoring and out-of-range alarms for every channel. A high performance internal reference is also available to provide for a complete solution in the most difficult operating conditions.

The ADC128D818’s 12-bit delta-sigma ADC supports Standard Mode (Sm, 100 kbps) and Fast Mode (Fm, 400 kbps) I2C interfaces. The ADC128D818 includes a sequencer to control channel conversions and stores all converted results in independent registers for easy microprocessor retrieval. Unused channels can be shut down independently to conserve power.

The ADC can use either an internal 2.56-V reference or a variable external reference. An analog filter is included on the I2C digital control lines to provide improved noise immunity. The device also includes a TIME-OUT reset function on SDA and SCL to prevent I2C bus lock-up.

The ADC128D818 operates from 3-V to 5.5-V power supply voltage range, –40°C to 125°C temperature range, and the device is available in a 16-pin TSSOP package.

Features

12-Bit Resolution Delta-Sigma ADC

Local Temperature Sensing

Configurable Single-Ended and/or Pseudo-Diff.

Inputs

2.56-V Internal VREF or Variable External VREF

WATCHDOG Window Comparators with Status

and Mask Registers of All Measured Values

Independent Registers for Storing Measured

Values

INT Output Notifies Microprocessor of Error Event

I2C Serial Bus Interface Compatibility

9 Selectable Addresses

TIME-OUT Reset Function to Prevent I2C Bus

Lock-Up

Individual Channel Shutdown to Limit Power

Consumption

Deep Shutdown Mode to Minimize Power

Consumption

TSSOP 16-Lead Package

Key Specifications

ADC Resolution 12-Bit

Supply Voltage Range 3 V to 5.5 V

Total Unadjusted Error –0.45%/+0.2%

Integral Non-Linearity ±1 LSb

Differential Non-Linearity ±1 LSb

Operating Current 0.56 mA

Deep Shutdown Current 10 ±A

Temperature Resolution °C/LSb

Temperature Accuracy (–40°C to 125°C) ±3°C

Temperature Accuracy (–25°C to 100°C) ±2°C