ADC128D818 System Monitor: Pinout, Features and Datasheet

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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 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. The ADC128D818’s 12-bit delta-sigma ADC supports Standard Mode (Sm, 100 kbps) and Fast Mode (Fm, 400 kbps) I²C interfaces. The ADC128D818 allows up to 8 single-ended inputs or 4 pseudo-differential inputs as selected by the modes of operation.

This article provides you with a basic overview of the ADC128D818, including its pin descriptions, features and specifications, etc., to help you quickly understand what ADC128D818 is.

• 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

The ADC128D818 provides 8 analog inputs, a temperature sensor, a delta-sigma ADC, an external or internal VREF option, and WATCHDOG registers on a single chip. An I²C Serial Bus interface is also provided. The ADC128D818 can perform voltage and temperature monitoring for a variety of systems. 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 continuously converts the voltage input to 12-bit resolution with an internal VREF of 0.625-mV LSb (Least Significant bit) weighting, yielding input range of 0 V to 2.56 V. There is also an external VREF option that ranges from 1.25 V to V+. The analog inputs are intended to be connected to several power supplies present in a variety of systems. Eight inputs can be configured for single-ended and/or pseudo-differential channels. Temperature can be converted to a 9-bit two's complement word with resolutions of 0.5°C per LSb.

The ADC128D818 provides a number of internal registers. The ADC128D818 supports Standard Mode (Sm, 100 kbps) and Fast Mode (Fm, 400 kbps) I²C interface modes of operation. ADC128D818 includes an analog filter on the I²C digital control lines that allows improved noise immunity. The device also supports TIME-OUT reset function on SDA and SCL to prevent I²C bus lock-up. Two tri-level address pins allow up to 9 devices on a single I²C bus. At start-up, ADC128D818 cycles through each measurement in sequence and continuously loops through the sequence based on the Conversion Rate Register (address 07h) setting. Each measured value is compared to values stored in the Limit Registers (addresses 2Ah - 39h). When the measured value violates the programmed limit, the ADC128D818 will set a corresponding interrupt bit in the Interrupt Status Registers (address 01h). An interrupt output pin, INT, is also available and fully programmable.

Functional Block Diagram

Typical Application Diagram

• Communications Infrastructure

• Thermal and Hardware Server Monitors

• System Monitors

• Industrial and Medical Systems

• Electronic Test Equipment and Instrumentation

• Power Supply Monitoring and Supervision

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