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ADM1025ARQZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
Low Cost PC
Hardware Monitor ASIC
Preliminary Technical Data
ADM1025/ADM1025A
©2008 SCILLC. All rights reserved. Publication Order Number:
February 2008 – Rev. P5 ADM1025/D
FEATURES
Up to 8 measurement channels
5 inputs to measure supply voltages
V
CC
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
I
2
C® 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
APPLICATIONS
Network servers and personal computers
Microprocessor-based office equipment
Test equipment and measuring instruments
PRODUCT DESCRIPTION
The ADM1025/ADM1025A
1
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 V
CC
. 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 I
2
C 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
Figure 1.
1
Patent Pending. Purchase of licensed I
2
C components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the
Philips I
2
C Patent Rights to use these components in an I
2
C system, provided that the system conforms to the I
2
C Standard Specification as defined by Philips.
ADM1025/ADM1025A
Preliminary Technical Data
Rev. P5 | Page 2 of 21| www.onsemi.com
TABLE OF CONTENTS
Features...............................................................................................1
Applications .......................................................................................1
Product Description .........................................................................1
Functional Block Diagram...............................................................1
Revision History................................................................................2
Specifications .....................................................................................3
Absolute Maximum Ratings ............................................................5
Thermal Characteristics...............................................................5
ESD Caution ..................................................................................5
Pin Configuration and Function Descriptions .............................6
Typical Performance Characteristics..............................................7
General Description..........................................................................9
Measurement Inputs.....................................................................9
Sequential Measurement..............................................................9
Processor Voltage ID ....................................................................9
ADD/
RST
/
INT
/NTO ...................................................................9
Internal Registers of the ADM1025/ADM1025A.....................9
Serial Bus Interface .......................................................................9
Measurement Inputs...................................................................11
A/D Converter.............................................................................11
Input Circuits...............................................................................12
Temperature Measurement System ..............................................13
Internal Temperature Measurement ........................................13
External Temperature Measurement........................................13
Layout Considerations ...................................................................14
Limit Values.................................................................................14
Status Registers............................................................................14
Monitoring Cycle Time..............................................................14
Input Safety..................................................................................14
Layout and Grounding...............................................................15
RST/INT Output.........................................................................15
Genterating an
SMBALERT
......................................................15
NAND Tree Tests ........................................................................16
Using the ADM1025/ADM1025A................................................17
Power-On Reset ..........................................................................17
Initialization ................................................................................17
Using the Configuration Register.............................................17
Using the Offset Register ...........................................................17
Starting Conversion....................................................................17
Reduced Power and Shutdown Mode ......................................17
5 V Operation..............................................................................17
Registers ...........................................................................................18
Outline Dimensions........................................................................21
Ordering Guide...........................................................................21
REVISION HISTORY
02/08—Rev P5: Conversion to ON Semiconductor
x/07—Rev. C to Rev. D
4/03—Rev. B to Rev. C
10/02—Rev. A to Rev. B
11/99—Revision 0: Initial Version
Preliminary Technical Data
ADM1025/ADM1025A
Rev. P5 | Page 3 of 21| www.onsemi.com
SPECIFICATIONS
T
A
= T
MIN
to T
MAX
, V
CC
= V
MIN
to V
MAX
, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
POWER SUPPLY
Supply Voltage, V
CC
1
3.0 3.30 5.5 V
Supply Current, I
CC
2
1.4 2.5 mA Interface Inactive, ADC Active
32 500 μA Standby Mode
TEMPERATURE-TO-DIGITAL CONVERTER
Internal Sensor Accuracy ±3 °C
Resolution 1 °C
External Diode Sensor Accuracy ±5 °C
±3 °C 60°C ≤ T
A
≤ 100°C; V
CC
= 3.3 V
Resolution 1 °C
Remote Sensor Source Current 180 μA High Level
11 μA Low Level
ANALOG-TO-DIGITAL CONVERTER (INCLUDING MUX AND
AT TENUATORS)
Total Unadjusted Error, TUE
3
±2 %
Differential Nonlinearity, DNL ±1 LSB
Power Supply Sensitivity ±1 %/V
Conversion Time (Analog Input or Internal Temperature)
4
11.6 ms
Conversion Time (External Temperature)
4
34.8 ms
Input Resistance (2.5 V, 3.3 V, 5 V, 12 V, V
CCPIN
) 80 140 250 kΩ
OPEN-DRAIN DIGITAL OUTPUT ADD/
RST
/
INT
/NTO
Output Low Voltage, V
OL
0.4 V I
OUT
= −6.0 mA; V
CC
= 3 V
High Level Output Leakage Current, I
OH
0.1 1 μA V
OUT
= V
CC
; V
CC
= 3 V
RST
Pulsewidth 20 45 ms
OPEN-DRAIN SERIAL DATABUS OUTPUT (SDA)
Output Low Voltage, V
OL
0.4 V I
OUT
= –6.0 mA; V
CC
= 3 V
High Level Output Leakage Current, I
OH
0.1 1 μA V
OUT
= V
CC
SERIAL BUS DIGITAL INPUTS (SCL, SDA)
Input High Voltage, V
IH
2.1 V
Input Low Voltage, V
IL
0.8 V
Hysteresis 500 mV
DIGITAL INPUT LOGIC LEVELS (ADD, VID0–VID4, NTI)
5
VID0–VID3 Input Resistance 100 kΩ ADM1025 Only
VID4 Input Resistance 300 kΩ ADM1025 Only
100 kΩ ADM1025A
Input High Voltage, V
IH
6
2.1 V
Input Low Voltage, V
IL
6
0.8 V
DIGITAL INPUT LEAKAGE CURRENT
Input High Current, I
IH
−1 μA V
IN
= V
CC
Input Low Current, I
IL
+1 μA V
IN
= 0
Input Capacitance, C
IN
5 pF
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

ADM1025ARQZ

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Manufacturer:
ON Semiconductor
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IC MONITOR SYS/VOLT 5CH 16QSOP
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