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ADM1025A Dataheets PDF



Part Number ADM1025A
Manufacturers Analog Devices
Logo Analog Devices
Description Low-Cost PC Hardware Monitor ASIC
Datasheet ADM1025A DatasheetADM1025A Datasheet (PDF)

a FEATURES Up to Eight Measurement Channels Five Inputs to Measure Supply Voltages V CC Monitored Internally External Temperature Measurement with Remote Diode On-Chip Temperature Sensor Five Digital Inputs for VID Bits Integrated 100 k⍀ Pull-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.

  ADM1025A   ADM1025A


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a FEATURES Up to Eight Measurement Channels Five Inputs to Measure Supply Voltages V CC Monitored Internally External Temperature Measurement with Remote Diode On-Chip Temperature Sensor Five Digital Inputs for VID Bits Integrated 100 k⍀ Pull-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 Low-Cost PC Hardware Monitor ASIC ADM1025/ADM1025A* PRODUCT DESCRIPTION The ADM1025/ADM1025A is a complete system hardware monitor for microprocessor-based systems, providing measurement 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 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 VDD VID0 VID1 VID2 VID3 300k⍀ 12VIN/VID4 VCC POWER TO CHIP 100k⍀ PULLUPS VID4 REGISTER SERIAL BUS INTERFACE ADD/RST/INT/NTO SDA SCL VID0–3 REGISTER ADM1025/ ADM1025A VALUE AND LIMIT REGISTERS VCCPIN 2.5VIN 3.3VIN 5VIN D+ D–/NTI BANDGAP TEMPERATURE SENSOR INPUT ATTENUATORS AND ANALOG MULTIPLEXER ADDRESS POINTER REGISTER LIMIT COMPARATORS MEASUREMENT STATUS REGISTERS ADC OFFSET REGISTER 2.5V BANDGAP REFERENCE 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 ADM1025/ADM1025A–SPECIFICATIONS (T = T A MIN to TMAX, VCC = VMIN to VMAX, unless otherwise noted.) Unit V mA µA °C °C °C °C °C µA µA Test Conditions/Comments (Note 1) Interface Inactive, ADC Active Standby Mode (Note 2) Parameter POWER SUPPLY Supply Voltage, VCC Supply Current, ICC TEMPERATURE-TO-DIGITAL CONVERTER Internal Sensor Accuracy Resolution External Diode Sensor Accuracy Resolution Remote Sensor Source Current ANALOG-TO-DIGITAL CONVERTER (INCLUDING MUX AND ATTENUATORS) Total Unadjusted Error, TUE Differential Nonlinearity, DNL Power Supply Sensitivity Conversion Time (Analog Input or Internal Temperature) Conversion Time (External Temperature) Input Resistance (2.5 V, 3.3 V, 5 V, 12 V, V CCPIN) OPEN-DRAIN DIGITAL OUTPUT ADD/RST/INT/NTO Output Low Voltage, V OL High Level Output Leakage Current, I OH RST Pulsewidth OPEN-DRAIN SERIAL DATA BUS OUTPUT (SDA) Output Low Voltage, V OL High Level Output Leakage Current, I OH SERIAL BUS DIGITAL INPUTS (SCL, SDA) Input High Voltage, V IH Input Low Voltage, VIL Hysteresis DIGITAL INPUT LOGIC LEVELS (ADD, VID0–VID4, NTI) 5 VID0–3 Input Resistance VID4 Input Resistance Input High Voltage, V IH6 Input Low Voltage, VIL6 DIGITAL INPUT LEAKAGE CURRENT Input High Current, I IH Input Low Current, IIL Input Capacitance, CIN 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 t SU:STO SCL Low Time, tLOW SCL High Time, t HIGH SCL, SDA Rise Time, t R SCL, SDA Fall Time, tF Data Setup Time, t SU:DAT Data Hold Time, tHD:DAT Min 3.0 Typ 3.30 1.4 32 Max 5.5 2.5 500 ±3 1 ±5 ±3 1 180 11 60°C ≤ TA ≤ 100°C; VCC = 3.3 V High Level Low Level 100 ±1 11.6 34.8 140 ±2 ±1 250 0.4 1 45 0.4 1 % LSB %/V ms ms kΩ V µA ms V µA V V mV (Note 3) (Note 4) (Note 4) 0.1 20 IOUT = –6.0 mA; VCC = 3 V VOUT = VCC; VCC = 3 V 0.1 2.1 IOUT = –6.0 mA; VCC = 3 V VOUT = VCC 0.8 500 100 300 100 2.1.


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