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ADC128D818
SNAS483F – FEBRUARY 2010 – REVISED AUGUST 2015
ADC128D818 12-Bit, 8-Channel, ADC System Monitor With Temperature Sensor, Internal – External Reference, and I2C Interface
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.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADC128D818
TSSOP (16)
5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
Typical Application Diagram
LM94022
V+ VREF
ADC128D818
Single-Ended Positive Voltage
Internal VREF = +2.56V
10VIN Shutdown Margining
Pseudo-Differential Positive Voltage
DC-DC
IN0
Interrupt
IN1
Interrupt
Masking
VOUT
IN2 IN3
IN4 (+) IN5 (-)
12-bit Delta-Sigma
ADC
Status Registers
and Interrupt Control
INT
IN7 (+)
IN6 (-)
Voltage
SDA
Temperature Sensor
I2C Interface and Control
SCL A0
A1
RTRACE
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.
ADC128D818
SNAS483F – FEBRUARY 2010 – REVISED AUGUST 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Description (continued)......................................... 3 6 Pin Configuration and Functions ......................... 4 7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5 7.2 ESD Ratings.............................................................. 5 7.3 Recommended Operating Conditions....................... 6 7.4 Thermal Information .................................................. 6 7.5 DC Electrical Characteristics .................................... 6 7.6 AC Electrical Characteristics..................................... 9 7.7 Typical Characteristics ............................................ 10 8 Detailed Description ............................................ 14 8.1 Overview ................................................................. 14 8.2 Functional Block Diagram ....................................... 14 8.3 Feature Description................................................. 15
8.4 Device Functional Modes........................................ 16 8.5 Programming........................................................... 16 8.6 Register Maps ......................................................... 19 9 Application and Implementation ........................ 28 9.1 Application Information..................