ADC128D818_14 Datasheet, PDF (1/41 Pages) Texas Instruments – ADC128D818 12-Bit, 8-Channel, ADC System Monitor with Temperature Sensor Internal/External Reference, and I2C Interface

ADC128D818
www.ti.com
SNAS483E – FEBRUARY 2010 – REVISED MARCH 2013
ADC128D818 12-Bit, 8-Channel, ADC System Monitor with Temperature Sensor,
Internal/External Reference, and I²C Interface
Check for Samples: ADC128D818
FEATURES
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•2 12-bit Resolution Delta-Sigma ADC
• Local Temperature Sensing
• Configurable Single-Ended and/or Pseudo-Diff.
Inputs
• +2.56V 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
• TIMEOUT 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
APPLICATIONS
• Communications Infrastructure
• Thermal / Hardware Server Monitors
• System Monitors
• Industrial and Medical Systems
• Electronic Test Equipment and
Instrumentation
• Power Supply Monitoring / Supervision
KEY SPECIFICATIONS
• ADC Resolution 12-bit
• Supply Voltage Range +3 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
• Temp. Accuracy (–40°C to 125°C) ±3°C
• Temp. Accuracy (–25°C to 100°C) ±2°C
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 on-board 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 kbits/s) and Fast Mode
(Fm, 400kbits/s) 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.
The ADC can use either an internal 2.56V reference
or a variable external reference. An analog filter is
included on the I²C digital control lines to provide
improved noise immunity. The device also includes a
TIMEOUT reset function on SDA and SCL to prevent
I²C bus lock-up.
The ADC128D818 operates from +3.0 to +5.5V
power supply voltage range, –40°C to 125°C
temperature range, and the device is available in a
16-pin TSSOP package.
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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