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ADM1025 Datasheet(PDF) 6 Page - ON Semiconductor

Part No. ADM1025
Description  Low Cost PC Hardware Monitor ASIC
Download  21 Pages
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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ADM1025 Datasheet(HTML) 6 Page - ON Semiconductor

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ADM1025/ADM1025A
Preliminary Technical Data
Rev. P5 | Page 6 of 21| www.onsemi.com
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Figure 3.Pin Configuration
Table 3. Pin Function Descriptions
Pin
No.
Mnemonic
Description
1
SDA
Digital I/O. Serial bus bidirectional data. Open-drain output.
2
SCL
Digital Input. Serial bus clock.
3
GND
System Ground
4
VCC
Power. Can be powered by 3.3 V standby power if monitoring in low power states is required. This pin also
serves as the analog input to monitor VCC.
5
VID0
Digital Input. Core voltage ID readouts from the processor. This value is read into the VID0−VID3 Status
Register. It has an on-chip 100 kΩ pull-up resistor (ADM1025 only).
6
VID1
Digital Input. Core voltage ID readouts from the processor. This value is read into the VID0−VID3 Status
Register. It has an on-chip 100 kΩ pull-up resistor (ADM1025 only).
7
VID2
Digital Input. Core voltage ID readouts from the processor. This value is read into the VID0−VID3 Status
Register. It has an on-chip 100 kΩ pull-up resistor (ADM1025 only).
8
VID3
Digital Input. Core voltage ID readouts from the processor. This value is read into the VID0−VID3 Status
Register. It has an on-chip 100 kΩ pull-up resistor (ADM1025 only).
9
D−/NTI
Analog/Digital Input. Connected to cathode of external temperature sensing diode. If held high at power-up, it
initiates NAND tree test mode.
10
D+
Analog Input. Connected to anode of external temperature sensing diode.
11
12VIN/VID4
Programmable Analog/Digital Input. Defaults to 12 VIN analog input at power-up but may be pro-grammed as
VID4 Core Voltage ID readout from the processor. This value is read into the VID4 Status Register. In analog 12
VIN mode, it has an on-chip voltage attenuator. In VID4 mode, it has an on-chip 300 kΩ pull-up resistor.
12
5VIN
Analog Input. Monitors 5 V supply.
13
3.3VIN
Analog Input. Monitors 3.3 V supply.
14
2.5VIN
Analog Input. Monitors 2.5 V supply.
15
VCCPIN
Analog Input. Monitors processor core voltage (0 V to 3.0 V).
16
ADD/RST/INT/NTO
Programmable Digital I/O. The lowest order programmable bit of the SMBus Address, sampled on SMB activity
as a three-state input. Can also be configured to give a minimum 20 ms low reset output pulse. Alternatively, it
can be programmed as an interrupt output for temperature/voltage interrupts. Functions as the output of the
NAND tree in NAND tree test mode.


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