ADM1022ARQ-REEL7

ADM1022ARQ-REEL7 Datasheet

ADM1022

Part	Datasheet
ADM1022ARQ-REEL7	ADM1022ARQ-REEL7 (pdf)

Related Parts	Information
ADM1022ARQZ-REEL7	ADM1022ARQZ-REEL7
ADM1022ARQ-REEL	ADM1022ARQ-REEL
ADM1022ARQZ	ADM1022ARQZ
ADM1022ARQZ-REEL	ADM1022ARQZ-REEL

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Low-Cost PC Temperature Monitor and Fan Control ASIC ADM1022 FEATURES External Temperature Measurement with Remote Diode Two Channels On-Chip Temperature Sensor Interrupt and Over-Temperature Outputs Fault Tolerant Fan Control Brownout Detection LDCM Support System Management Bus SMBus Standby Mode to Minimize Power Consumption Limit Comparison of all Monitored Values APPLICATIONS Network Servers and Personal Computers Microprocessor-Based Equipment Test Equipment and Measuring Instruments GENERAL DESCRIPTION The ADM1022 is a low cost temperature monitor and fan controller for microprocessor-based systems. The temperature of one or two remote sensor diodes may be measured, allowing monitoring of processor temperature in single- or dual-processor systems. Measured values can be read out via a serial System Management Bus, and values for limit comparisons can be programmed in over the same serial bus. The ADM1022 also contains a DAC for fan speed control. Automatic hardware temperature trip points are provided and the fan will be driven to full speed if they are exceeded. Finally, the chip has two supply voltage monitors for brownout detection. The ADM1022’s V to V supply voltage range, low supply current, and SMBus interface make it ideal for a wide range of applications. These include hardware monitoring and protection applications in personal computers, electronic test equipment and electronics. FUNCTIONAL BLOCK DIAGRAM VCC VMON RST1 RESET GENERATOR 1 ADM1022 RST2 VCC RESET GENERATOR 2 BANDGAP TEMPERATURE SENSOR D1+ D2+/GPI ANALOG MULTIPLEXER ADDRESS POINTER REGISTER 2.5V BANDGAP REFERENCE SERIAL BUS INTERFACE ANALOG OUTPUT REGISTER AND 8-BIT DAC VALUE AND LIMIT REGISTERS LIMIT COMPARATORS INTERRUPT STATUS REGISTERS INT MASK REGISTER MASK GATING CONFIGURATION REGISTER ADD/NTEST_OUT SDA SCL FAN_SPD/NTEST_IN INT FAN_OFF 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: Fax 781/326-8703 Analog Devices, Inc., 2000 TA = TMIN to TMAX, VCC = VMIN to VMAX, unless otherwise noted. ORDERING GUIDE Model Temperature Range ADM1022ARQ 0°C to 85°C Package Description Package Option 16-Lead QSOP RQ-16 PIN CONFIGURATION FAN_OFF 1 16 SDA 15 SCL RST1 3 14 INT GND 4 ADM1022 13 ADD/NTEST_OUT TOP VIEW VCC 5 Not to Scale 12 D2+/GPI VMON 6 RST2 7 10 D1+ FAN_SPD/NTEST_IN 8 ADM1022 Pin No. Mnemonic 1 FAN_OFF 3 RST1 4 GND 5 VCC VMON 7 RST2 8 FAN_SPD/NTEST_IN 9 10 D1+ 11 12 D2+/GPI 13 ADD/NTEST_OUT 14 INT 15 SCL 16 SDA PIN FUNCTION DESCRIPTION Digital Output Open-Drain Fan Off Request. When asserted low this indicates a request to shut off the fan independent of the FAN_SPD output. When negated output FET off it indicates that the fan may be turned on. Digital Input, Manual Reset. A logic low on this input causes RST2 to be asserted. Once this input is negated that output will remain asserted for tRP. This input has an internal 20 pull-up resistor. Leave unconnected if not used. Digital I/O Open-Drain . This pin is asserted low while VCC remains below the reset threshold. It remains asserted for tRP after the reset condition is terminated. It is bidirectional so the ADM1022 can be optionally reset external logic must be used to prevent system auxiliary reset from occurring when used as an input. GROUND. Power and Signal Ground. POWER V. Power source and voltage monitor input for reset generator. Analog Input. Voltage monitor input for second reset generator. Digital Output Open-Drain . This pin is asserted low under any of the following conditions VMON or VCC remains below the reset threshold while MR is held low while RST1 is asserted. It remains asserted for tRP after the reset conditions are terminated. Analog Output/Test Input. An active-high input that enables NAND board-level connectivity testing. Refer to section on NAND testing. Used as an analog output for fan speed control when NAND test is not selected. Remote Thermal Diode Negative Input. This is the negative input current sink from the remote thermal diode. This also serves as the negative input into the A/D. Remote Thermal Diode Positive Input. This is the positive input current source from the remote thermal diode. This serves as the positive input into the A/D. Analog Input/Digital I/O Open-Drain . Can be programmed as negative input for a second diode temperature sensor, or as a digital I/O pin. In this case it is an active low thermal overload output that indicates a violation of a temperature set point over-temperature . Also acts as an input to provide external fan control. When this pin is pulled low by an external signal, a status bit is set and the fan speed is set to full on. Analog/Digital Input. Can be programmed as the positive input for a second diode sensor, or as a general-purpose logic input. In this case it can be programmed as an active high or active low input that sets Bit 4 of the Status Registers. This bit can only be reset by reading the status registers, provided GPI is in the inactive state. Digital I/O. The lowest order programmable bit of the SMBus Address. ADD is sampled at powerup and changing it while powered on will have no immediate effect. This pin also functions as an output when doing a NAND test. Digital Output Open Drain , System Interrupt Output. This signal indicates a violation of a set trip point. The output is enabled when Bit 1 of the Register is set to The default state is disabled. Digital Input SMBus Clock. Digital I/O Open-Drain SMBus Bidirectional Data. Performance Characteristics

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Low-Cost PC Temperature Monitor and Fan Control ASIC

ADM1022

FEATURES External Temperature Measurement with Remote

Diode Two Channels On-Chip Temperature Sensor Interrupt and Over-Temperature Outputs Fault Tolerant Fan Control Brownout Detection LDCM Support System Management Bus SMBus Standby Mode to Minimize Power Consumption Limit Comparison of all Monitored Values

APPLICATIONS Network Servers and Personal Computers Microprocessor-Based Equipment Test Equipment and Measuring Instruments

GENERAL DESCRIPTION The ADM1022 is a low cost temperature monitor and fan controller for microprocessor-based systems. The temperature of one or two remote sensor diodes may be measured, allowing monitoring of processor temperature in single- or dual-processor systems.

Measured values can be read out via a serial System Management Bus, and values for limit comparisons can be programmed in over the same serial bus.

The ADM1022 also contains a DAC for fan speed control. Automatic hardware temperature trip points are provided and the fan will be driven to full speed if they are exceeded.

Finally, the chip has two supply voltage monitors for brownout detection.

The ADM1022’s V to V supply voltage range, low supply current, and SMBus interface make it ideal for a wide range of applications. These include hardware monitoring and protection applications in personal computers, electronic test equipment and electronics.

FUNCTIONAL BLOCK DIAGRAM

VCC VMON

RST1

RESET GENERATOR 1

ADM1022

RST2 VCC

RESET GENERATOR 2

BANDGAP TEMPERATURE

SENSOR

D1+ D2+/GPI

ANALOG MULTIPLEXER

ADDRESS POINTER REGISTER
2.5V BANDGAP REFERENCE

SERIAL BUS INTERFACE

ANALOG OUTPUT REGISTER AND 8-BIT DAC

VALUE AND LIMIT

REGISTERS

LIMIT COMPARATORS

INTERRUPT STATUS

REGISTERS

INT MASK REGISTER

MASK GATING

CONFIGURATION REGISTER

ADD/NTEST_OUT SDA SCL FAN_SPD/NTEST_IN

INT FAN_OFF

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:

Fax 781/326-8703

Analog Devices, Inc., 2000

TA = TMIN to TMAX, VCC = VMIN to VMAX, unless otherwise noted.
ORDERING GUIDE

Model

Temperature Range

ADM1022ARQ 0°C to 85°C

Package Description

Package Option
16-Lead QSOP RQ-16

PIN CONFIGURATION

FAN_OFF 1
16 SDA
15 SCL

RST1 3
14 INT

GND 4 ADM1022 13 ADD/NTEST_OUT

TOP VIEW VCC 5 Not to Scale 12 D2+/GPI

VMON 6

RST2 7
10 D1+

FAN_SPD/NTEST_IN 8

ADM1022

Pin No. Mnemonic 1 FAN_OFF
3 RST1
4 GND
5 VCC

VMON
7 RST2
8 FAN_SPD/NTEST_IN
9 10 D1+ 11
12 D2+/GPI
13 ADD/NTEST_OUT 14 INT 15 SCL 16 SDA

PIN FUNCTION DESCRIPTION

Digital Output Open-Drain Fan Off Request. When asserted low this indicates a request to shut off the fan independent of the FAN_SPD output. When negated output FET off it indicates that the fan may be turned on. Digital Input, Manual Reset. A logic low on this input causes RST2 to be asserted. Once this input is negated that output will remain asserted for tRP. This input has an internal 20 pull-up resistor. Leave unconnected if not used.

Digital I/O Open-Drain . This pin is asserted low while VCC remains below the reset threshold. It remains asserted for tRP after the reset condition is terminated. It is bidirectional so the ADM1022 can be optionally reset external logic must be used to prevent system auxiliary reset from occurring when used as an input. GROUND. Power and Signal Ground. POWER V. Power source and voltage monitor input for reset generator.

Analog Input. Voltage monitor input for second reset generator. Digital Output Open-Drain . This pin is asserted low under any of the following conditions VMON or VCC remains below the reset threshold while MR is held low while RST1 is asserted. It remains asserted for tRP after the reset conditions are terminated. Analog Output/Test Input. An active-high input that enables NAND board-level connectivity testing. Refer to section on NAND testing. Used as an analog output for fan speed control when NAND test is not selected.

Remote Thermal Diode Negative Input. This is the negative input current sink from the remote thermal diode. This also serves as the negative input into the A/D.

Remote Thermal Diode Positive Input. This is the positive input current source from the remote thermal diode. This serves as the positive input into the A/D.

Analog Input/Digital I/O Open-Drain . Can be programmed as negative input for a second diode temperature sensor, or as a digital I/O pin. In this case it is an active low thermal overload output that indicates a violation of a temperature set point over-temperature . Also acts as an input to provide external fan control. When this pin is pulled low by an external signal, a status bit is set and the fan speed is set to full on.

Analog/Digital Input. Can be programmed as the positive input for a second diode sensor, or as a general-purpose logic input. In this case it can be programmed as an active high or active low input that sets Bit 4 of the Status Registers. This bit can only be reset by reading the status registers, provided GPI is in the inactive state. Digital I/O. The lowest order programmable bit of the SMBus Address. ADD is sampled at powerup and changing it while powered on will have no immediate effect. This pin also functions as an output when doing a NAND test.

Digital Output Open Drain , System Interrupt Output. This signal indicates a violation of a set trip point. The output is enabled when Bit 1 of the Register is set to The default state is disabled. Digital Input SMBus Clock.

Digital I/O Open-Drain SMBus Bidirectional Data.

Performance Characteristics

More datasheets: B82422H1223K100 | B82422H1222K100 | B82422H1102K100 | B82422H1104K100 | B82422H1473K100 | B82422H1103K100 | CDB5581 | A-2014-1-4-SMT-N-R | ADM1022ARQZ-REEL7 | ADM1022ARQ-REEL

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Datasheet ID: ADM1022ARQ-REEL7 517827