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a
Low-Cost PC
Hardware Monitor ASIC
ADM1025/ADM1025A*
FEATURES
Up to Eight Measurement Channels
Five Inputs to Measure Supply Voltages
VCC Monitored Internally
External Temperature Measurement with Remote Diode
On-Chip Temperature Sensor
Five Digital Inputs for VID Bits
Integrated 100 kPull-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
PRODUCT DESCRIPTION
The ADM1025/ADM1025A 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 moni-
tored. The ADM1025A has open-drain VID inputs while the
ADM1025 has on-chip 100 kpull-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 under-
voltage, 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
VID0
VID1
VID2
VID3
12VIN/VID4
VCC
VDD
VID0–3
REGISTER
100k
300kPULLUPS
VID4
REGISTER
POWER TO CHIP
SERIAL BUS
INTERFACE
ADM1025/
ADM1025A
VALUE AND
LIMIT
REGISTERS
ADD/RST/INT/NTO
SDA
SCL
VCCPIN
2.5VIN
3.3VIN
5VIN
D+
D–/NTI
BANDGAP
TEMPERATURE
SENSOR
INPUT
ATTENUATORS
AND
ANALOG
MULTIPLEXER
ADDRESS
POINTER
REGISTER
ADC
2.5V
BANDGAP
REFERENCE
LIMIT
COMPARATORS
MEASUREMENT
STATUS
REGISTERS
OFFSET
REGISTER
CONFIGURATION
REGISTER
GND
*Patent Pending.
I2C is a registered trademark of Philips Corporation.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000

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ADM1025/ADM1025A–SPECIFICATIONS (TA = TMIN to TMAX, VCC = VMIN to VMAX, unless otherwise noted.)
Parameter
Min Typ Max Unit Test Conditions/Comments
POWER SUPPLY
Supply Voltage, VCC
Supply Current, ICC
3.0 3.30 5.5
V
(Note 1)
1.4 2.5 mA Interface Inactive, ADC Active
32 500 µA
Standby Mode (Note 2)
TEMPERATURE-TO-DIGITAL CONVERTER
Internal Sensor Accuracy
Resolution
External Diode Sensor Accuracy
Resolution
Remote Sensor Source Current
± 3 °C
1 °C
± 5 °C
± 3 °C 60°C TA 100°C; VCC = 3.3 V
1 °C
180 µA High Level
11 µA Low Level
ANALOG-TO-DIGITAL CONVERTER
(INCLUDING MUX AND ATTENUATORS)
Total Unadjusted Error, TUE
Differential Nonlinearity, DNL
Power Supply Sensitivity
±1
Conversion Time (Analog Input or Internal Temperature)
11.6
Conversion Time (External Temperature)
34.8
Input Resistance (2.5 V, 3.3 V, 5 V, 12 V, VCCPIN)
100 140
OPEN-DRAIN DIGITAL OUTPUT ADD/RST/INT/NTO
Output Low Voltage, VOL
High Level Output Leakage Current, IOH
RST Pulsewidth
0.1
20
±2
±1
250
0.4
1
45
%
LSB
%/V
ms
ms
k
V
µA
ms
(Note 3)
(Note 4)
(Note 4)
IOUT = –6.0 mA; VCC = 3 V
VOUT = VCC; VCC = 3 V
OPEN-DRAIN SERIAL DATA BUS OUTPUT (SDA)
Output Low Voltage, VOL
High Level Output Leakage Current, IOH
SERIAL BUS DIGITAL INPUTS (SCL, SDA)
Input High Voltage, VIH
Input Low Voltage, VIL
Hysteresis
0.4 V
IOUT = –6.0 mA; VCC = 3 V
0.1 1
µA VOUT = VCC
2.1
500
0.8
V
V
mV
DIGITAL INPUT LOGIC LEVELS
(ADD, VID0–VID4, NTI)5
VID0–3 Input Resistance
VID4 Input Resistance
Input High Voltage, VIH6
Input Low Voltage, VIL6
100 kADM1025 Only
300 kADM1025 Only
100 kADM1025A
2.1 V
0.8 V
DIGITAL INPUT LEAKAGE CURRENT
Input High Current, IIH
Input Low Current, IIL
Input Capacitance, CIN
–1
5
1
µA VIN = VCC
µA VIN = 0
pF
SERIAL BUS TIMING
Clock Frequency, fSCLK
Glitch Immunity, tSW
Bus Free Time, tBUF
Start Setup Time, tSU:STA
Start Hold Time, tHD:STA
Stop Condition Setup Time tSU:STO
SCL Low Time, tLOW
SCL High Time, tHIGH
SCL, SDA Rise Time, tR
SCL, SDA Fall Time, tF
Data Setup Time, tSU:DAT
Data Hold Time, tHD:DAT
50
1.3
600
600
600
1.3
0.6
100
300
400 kHz See Figure 1
ns See Figure 1
µs See Figure 1
ns See Figure 1
ns See Figure 1
ns See Figure 1
µs See Figure 1
µs See Figure 1
300 ns
See Figure 1
300 ns
See Figure 1
ns See Figure 1
ns See Figure 1
NOTES
1All voltages are measured with respect to GND, unless otherwise specified.
2Typicals are at TA = 25°C and represent most likely parametric norm. Shutdown current typ is measured with VCC = 3.3 V.
3TUE (Total Unadjusted Error) includes Offset, Gain and Linearity errors of the ADC, multiplexer and on-chip input attenuators, including an external series input
protection resistor value between zero and 1 k.
4Total monitoring cycle time is nominally 114.4 ms. Monitoring Cycle consists of 6 Voltage + 1 Internal Temperature + 1 External Temperature readings.
5ADD is a three-state input that may be pulled high, low or left open-circuit.
6Timing specifications are tested at logic levels of VIL = 0.8 V for a falling edge and VIH = 2.2 V for a rising edge.
Specifications subject to change without notice.
–2– REV. A

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ABSOLUTE MAXIMUM RATINGS*
Positive Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . 6.5 V
Voltage on 12 V VIN Pin . . . . . . . . . . . . . . . . . . . . . . . . . 20 V
Voltage on Any Input or Output Pin . . . . . . . . . –0.3 V to +6.5 V
Input Current at Any Pin . . . . . . . . . . . . . . . . . . . . . . . ± 5 mA
Package Input Current . . . . . . . . . . . . . . . . . . . . . . . ± 20 mA
Maximum Junction Temperature (TJ max) . . . . . . . . . . 150°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature, Soldering
Vapor Phase 60 sec . . . . . . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared 15 sec . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200°C
ESD Rating All Pins . . . . . . . . . . . . . . . . . . . . . . . . . . 2000 V
ADM1025/ADM1025A
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
THERMAL CHARACTERISTICS
16-Lead QSOP Package:
θJA = 105°C/W
θJC = 39°C/W
Model
ADM1025ARQ
ADM1025AARQ
Temperature
Range
0°C to 100°C
0°C to 100°C
ORDERING GUIDE
Package
Description
16-Lead QSOP
16-Lead QSOP
Package
Option
RQ-16
RQ-16
Option
Integrated 100 kVID Pull-Ups
Open-Drain VID Inputs
tR
tLOW
tF
tHD:STA
SCL
tHD:STA
SDA
tBUF
PS
tHD:DAT
tHIGH
tSU:DAT
tSU:STA
S
Figure 1. Diagram for Serial Bus Timing
tHD:STO
P
REV. A
–3–

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ADM1025/ADM1025A
Pin
No. Mnemonic
1 SDA
2 SCL
3 GND
4 VCC
5 VID0
6 VID1
7 VID2
8 VID3
9 D–/NTI
10 D+
11 12 VIN/VID4
12 5 VIN
13 3.3 VIN
14 2.5 VIN
15 VCCPIN
16 ADD/RST/INT/NTO
PIN FUNCTION DESCRIPTIONS
Description
Digital I/O. Serial bus bidirectional data. Open-drain output.
Digital Input. Serial bus clock.
System Ground.
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.
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 kpull-up resistor (ADM1025 only).
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 kpull-up resistor (ADM1025 only).
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 kpull-up resistor (ADM1025 only).
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 kpull-up resistor (ADM1025 only).
Analog/Digital Input. Connected to cathode of external temperature sensing diode. If held high at
power-up, initiates NAND tree test mode.
Analog Input. Connected to anode of external temperature sensing diode.
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 kpull-up resistor.
Analog Input. Monitors 5 V supply.
Analog Input. Monitors 3.3 V supply.
Analog Input. Monitors 2.5 V supply.
Analog Input. Monitors processor core voltage (0 V to 3.0 V).
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, can be programmed as an interrupt output for temperature/voltage
interrupts. Functions as the output of the NAND tree in NAND tree test mode.
PIN CONFIGURATION
SDA 1
16 ADD/RST/INT/NTO
SCL 2
15 VCCPIN
GND 3 ADM1025/ 14 2.5VIN
VCC 4 ADM1025A 13 3.3VIN
VID0
5
TOP VIEW
(Not to Scale) 12
5VIN
VID1 6
11 12VIN/VID4
VID2 7
10 D+
VID3 8
9 D/NTI
–4– REV. A

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Typical Performance Characteristics–ADM1025/ADM1025A
30
20
10
DXP TO GND
0
10
DXP TO VCC (5V)
20
30
40
50
60
1
3.3 10
30
LEAKAGE RESISTANCE M
100
Figure 2. Temperature Error vs. PC Board Track Resistance
120
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100 110
MEASURED TEMPERATURE
Figure 5. Pentium II ® Temperature Measurement vs.
ADM1025/ADM1025A Reading
6
5
4
250mV p-p REMOTE
3
2
1
100mV p-p REMOTE
0
1
50
500
5k 50k 500k
FREQUENCY Hz
5M 50M
Figure 3. Temperature Error vs. Power Supply Noise
Frequency
25
20
15
10
5
0
5
1 2.2 3.2 4.7 7 10
DXP-DXN CAPACITANCE nF
Figure 6. Temperature Error vs. Capacitance Between D+
and D–
25
20
100mV p-p
15
10
50mV p-p
5
0 25mV p-p
5
50
500
5k 50k 500k
FREQUENCY Hz
5M 50M
Figure 4. Temperature Error vs. Common-Mode Noise
Frequency
10
9
8
7
10mV SQ. WAVE
6
5
4
3
2
1
0
50 500 5k 50k 100k 500k 5M 25M 50M
FREQUENCY Hz
Figure 7. Temperature Error vs. Differential-Mode Noise
Frequency
Pentium II is a registered trademark of Intel Corporation.
REV. A
–5–