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Analog Devices Semiconductor Electronic Components Datasheet

M1025-1026 Datasheet

Low-Cost PC Hardware Monitor ASIC

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M1025-1026 pdf
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


Analog Devices Semiconductor Electronic Components Datasheet

M1025-1026 Datasheet

Low-Cost PC Hardware Monitor ASIC

No Preview Available !

M1025-1026 pdf
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


Part Number M1025-1026
Description Low-Cost PC Hardware Monitor ASIC
Maker Analog Devices
Total Page 16 Pages
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