1 Features

1• 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 μA

– Temperature Resolution °C/LSb

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

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

2 Applications

• Communications Infrastructure

• Thermal and Hardware Server Monitors

• System Monitors

• Industrial and Medical Systems

• Electronic Test Equipment and Instrumentation

• Power Supply Monitoring and Supervision

3 Description

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.