ADC128D818_15 Datasheet, PDF (1/46 Pages) Texas Instruments – ADC System Monitor

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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.