ADM1028ARQ

ADM1028ARQ Datasheet

ADM1028

Part	Datasheet
ADM1028ARQ	ADM1028ARQ (pdf)

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Remote Thermal Diode Monitor with Linear Fan Control ADM1028 FEATURES On-Chip Temperature Sensor External Temperature Measurement with Remote Diode Interrupt and Over-Temperature Outputs Fault-Tolerant Fan Control with Auto Hardware Trip Point Remote Reset and Power-Down Functions LDCM Support System Management Bus SMBus Communications Standby Mode to Minimize Power Consumption Limit Comparison of all Monitored Values DAC Output for Linear Fan Speed Control Ramp Rate Register for Control of Rate of Change of Fan Speed, Reduction of Fan Acoustics APPLICATIONS Network Servers and Personal Computers Microprocessor-Based Office Equipment Test Equipment and Measuring Instruments GENERAL DESCRIPTION The ADM1028 is a low-cost temperature monitor and fan controller for microprocessor-based systems. The temperature of a remote sensor diode may be measured, allowing monitoring of processor temperature in single processor systems. An on-chip temperature sensor monitors ambient system temperature. Measured values can be read out via the System Management Bus, and values for limit comparisons can be programmed in over the same serial bus. The ADM1028 also contains a DAC for fan speed control. An automatic hardware temperature trip point is provided and the fan will be driven to full speed if it is exceeded. A Ramp Rate Register is provided to control the rate with which fan speed is increased or decreased. This is to eliminate sudden changes in fan speed, thereby reducing fan acoustics and prolonging the fan’s life. Finally, the chip has remote reset and power-down functionality, allowing it to be remotely shut down via the SMBus. The ADM1028’s V to V supply voltage range, low supply current, and SMBus make it ideal for a wide range of applications. These include hardware monitoring applications in PCs, electronic test equipment, and office electronics. FUNCTIONAL BLOCK DIAGRAM VCC3AUX R_OFF VCC3AUX R_RST ADM1028 AUXRST RST RESET FAN_SPD SHUTOFF AND R_OFF RESET THERMA/NTEST_OUT VCC3AUX ANALOG SIGNAL CONDITIONING THERMB POWER-ON RESET REMOTE FUNCTION REGISTER ADDRESS POINTER REGISTER ALERT STATUS REGISTER 2.5V BANDGAP REFERENCE SERIAL BUS INTERFACE ANALOG O/P REGISTER, COUNTER AND 8-BIT DAC VALUE AND LIMIT REGISTERS LIMIT COMPARATORS INTERRUPT STATUS REGISTERS INT MASK REGISTER MASK GATING CONFIGURATION REGISTER 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies. ORDERING GUIDE Model Temperature Range ADM1028ARQ 0∞C to 100∞C Package Description Package Option Shrink Small Outline RQ-16 Package QSOP tBUF tLOW tR tHD STA tHD DAT tF tHIGH tSU DAT tHD STA tSU STA Figure Serial Bus Timing Diagram tSU STO P CAUTION ESD electrostatic discharge sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADM1028 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. ADM1028 PIN CONFIGURATION FAN_OFF 1 16 SDA GPI 2 15 SCL AUXRST 3 14 INT GND 4 ADM1028 13 R_OFF TOP VIEW VCC3AUX 5 Not to Scale 12 THERMB RST 6 11 THERMA/NTEST_OUT R_RST 7 10 D+ FAN_SPD/NTEST_IN 8 Pin No. 1 3 4 5 6 9 10 11 12 13 15 16 Mnemonic FAN_OFF AUXRST GND VCC3AUX RST R_RST FAN_SPD/NTEST_IN D+ THERMA/NTEST_OUT

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Remote Thermal Diode Monitor with Linear Fan Control

ADM1028

FEATURES On-Chip Temperature Sensor External Temperature Measurement with Remote Diode Interrupt and Over-Temperature Outputs Fault-Tolerant Fan Control with Auto Hardware Trip Point Remote Reset and Power-Down Functions LDCM Support System Management Bus SMBus Communications Standby Mode to Minimize Power Consumption Limit Comparison of all Monitored Values DAC Output for Linear Fan Speed Control Ramp Rate Register for Control of Rate of Change of

Fan Speed, Reduction of Fan Acoustics

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

GENERAL DESCRIPTION The ADM1028 is a low-cost temperature monitor and fan controller for microprocessor-based systems. The temperature of a remote sensor diode may be measured, allowing monitoring of processor temperature in single processor systems. An on-chip temperature sensor monitors ambient system temperature.

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

The ADM1028 also contains a DAC for fan speed control. An automatic hardware temperature trip point is provided and the fan will be driven to full speed if it is exceeded. A Ramp Rate Register is provided to control the rate with which fan speed is increased or decreased. This is to eliminate sudden changes in fan speed, thereby reducing fan acoustics and prolonging the fan’s life.

Finally, the chip has remote reset and power-down functionality, allowing it to be remotely shut down via the SMBus.

The ADM1028’s V to V supply voltage range, low supply current, and SMBus make it ideal for a wide range of applications. These include hardware monitoring applications in PCs, electronic test equipment, and office electronics.

FUNCTIONAL BLOCK DIAGRAM

VCC3AUX

R_OFF

VCC3AUX

R_RST

ADM1028

AUXRST RST

RESET

FAN_SPD SHUTOFF AND R_OFF RESET

THERMA/NTEST_OUT

VCC3AUX

ANALOG SIGNAL CONDITIONING

THERMB

POWER-ON RESET

REMOTE FUNCTION REGISTER

ADDRESS POINTER REGISTER

ALERT STATUS REGISTER
2.5V BANDGAP REFERENCE

SERIAL BUS INTERFACE

ANALOG O/P REGISTER, COUNTER AND 8-BIT DAC

VALUE AND LIMIT

REGISTERS

LIMIT COMPARATORS

INTERRUPT STATUS

REGISTERS

INT MASK REGISTER

MASK GATING

CONFIGURATION REGISTER

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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies.
ORDERING GUIDE

Model

Temperature Range

ADM1028ARQ 0∞C to 100∞C

Package Description

Package Option

Shrink Small Outline RQ-16 Package QSOP
tBUF
tLOW tR
tHD STA
tHD DAT
tF tHIGH
tSU DAT
tHD STA tSU STA

Figure Serial Bus Timing Diagram
tSU STO P

CAUTION ESD electrostatic discharge sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADM1028 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

ADM1028

PIN CONFIGURATION

FAN_OFF 1
16 SDA

GPI 2
15 SCL

AUXRST 3
14 INT

GND 4 ADM1028 13 R_OFF TOP VIEW

VCC3AUX 5 Not to Scale 12 THERMB

RST 6
11 THERMA/NTEST_OUT

R_RST 7
10 D+

FAN_SPD/NTEST_IN 8

Pin No. 1
3 4 5 6
9 10 11
12 13
15 16

Mnemonic FAN_OFF

AUXRST GND VCC3AUX RST

R_RST FAN_SPD/NTEST_IN

D+ THERMA/NTEST_OUT

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived ADM1028ARQ Datasheet file may be downloaded here without warranties.

Datasheet ID: ADM1028ARQ 517830