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National Semiconductor - ADC System Monitor

Numéro de référence ADC128D818
Description ADC System Monitor
Fabricant National Semiconductor 
Logo National Semiconductor 





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ADC128D818 fiche technique
ADC128D818
April 1, 2010
www.DataSheet4U.com
12-Bit, 8-Channel, ADC System Monitor with Temperature
Sensor, Internal/External Reference, and I2C Interface
1.0 General Description
The ADC128D818 I2Csystem monitor is designed for max-
imum 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 Stan-
dard 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 con-
serve power.
The ADC can use either an internal 2.56V reference or a vari-
able 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.
2.0 Applications
Communications Infrastructure
Thermal / Hardware Server Monitors
System Monitors
Industrial and Medical Systems
Electronic Test Equipment and Instrumentation
Power Supply Monitoring / Supervision
3.0 Features
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
4.0 Key Specifications
■ ADC Resolution
■ Supply Voltage Range
■ Total Unadjusted Error
■ Integral Non-Linearity
■ Differential Non-Linearity
■ Operating Current
■ Deep Shutdown Current
■ Temperature Resolution
■ Temp. Accuracy (–40°C to 125°C)
■ Temp. Accuracy (–25°C to 100°C)
12-bit
+3.0V to +5.5V
–0.45/+0.2%
±1LSb
±1LSb
0.56 mA
10 µA
0.5°C/LSb
± 3°C
± 2°C
5.0 Typical Application
I2C® is a registered trademark of the Philips Corporation.
© 2010 National Semiconductor Corporation 300963
30096301
www.national.com

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