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.