Low-Cost PC Hardware Monitor ASIC
Description
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FEATURES Up to Eight Measurement Channels Five Inputs to Measure Supply Voltages V CC Monitored Internally External Temperature Measurement with Remote Diode On-Chip Temperature Sensor Five Digital Inputs for VID Bits Integrated 100 k⍀ Pull-Ups on VID Pins (ADM1025 Only) LDCM Support I2C®-Compatible System Management Bus (SMBus) Programmable RESET Output Pin Programmable INT Output Pin Configurable Offset for Internal/External Channel Shutdown Mode to Minimize Power Consumption Limit Comparison of all Monitored Values APPLICATIONS Network Servers and Personal Computers Microprocessor-Based Office Equipment Test Equipment and Measuring Instruments
Low-Cost PC Hardware Monitor ASIC ADM1025/ADM1025A*
PRODUCT DESCRIPTION
The ADM1025/ADM1025A is a complete system hardware monitor for microprocessor-based systems, providing measurement and limit comparison of various system parameters.
Five voltage measurement inputs are provided, for monitoring 2.
5 V, 3.
3 V, 5 V and 12 V power supplies and the processor core voltage.
The ADM1025/ADM1025A can monitor a sixth power supply voltage by measuring its own VCC.
One input (two pins) is dedicated to a remote temperature-sensing diode, and an on-chip temperature sensor allows ambient temperature to be monitored.
The ADM1025A has open-drain VID inputs while the ADM1025 has on-chip 100 kΩ pull-ups on the VID inputs.
Measured values and in/out of limit status can be read out via an I2C-compatible serial System Management Bus.
The device can be controlled and configured over the same serial bus.
The device also has a programmable INT output to indicate undervoltage, overvoltage and over-temperature conditions.
The ADM1025/ADM1025A’s 3.
0 V to 5.
5 V supply voltage range, low supply current, and I2C-compatible interface make it ideal for a wide range of applications.
These include hardware monitoring and protection applications in personal computers, electronic test equipment, and office electronics.
FUNCTIONAL BLOCK DIAGRAM
VDD VID0 VID...
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