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ADM1025A Datasheet(PDF) 1 Page - ON Semiconductor

Part No. ADM1025A
Description  Low Cost PC Hardware Monitor ASIC
Download  21 Pages
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

ADM1025A Datasheet(HTML) 1 Page - ON Semiconductor

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Low Cost PC
Hardware Monitor ASIC
Preliminary Technical Data
©2008 SCILLC. All rights reserved.
Publication Order Number:
February 2008 – Rev. P5
Up to 8 measurement channels
5 inputs to measure supply voltages
VCC monitored internally
External temperature measurement with remote diode
On-chip temperature sensor
5 digital inputs for VID bits
Integrated 100 kΩ pull-ups on VID pins (ADM1025 only)
LDCM support
I2C® compatible system management bus (SMBus)
Programmable RST output pin
Programmable INT output pin
Configurable offset for internal/external channel
Shutdown mode to minimize power consumption
Limit comparison of all monitored values
Network servers and personal computers
Microprocessor-based office equipment
Test equipment and measuring instruments
The ADM1025/ADM1025A1 is a complete system hardware
monitor for microprocessor-based systems, providing measure-
ment 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 overtemperature 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.
Figure 1.
1 Patent Pending. Purchase of licensed I2C components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the
Philips I 2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips.

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