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ADM1022ARQ Folha de dados(PDF) 1 Page - Analog Devices |
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ADM1022ARQ Folha de dados(HTML) 1 Page - Analog Devices |
1 / 19 page REV. 0 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. a ADM1022 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 Low-Cost PC Temperature Monitor and Fan Control ASIC FUNCTIONAL BLOCK DIAGRAM 2.5V BANDGAP REFERENCE ADDRESS POINTER REGISTER ADC RESET GENERATOR 1 ANALOG MULTIPLEXER ADM1022 RST1 RST2 D1+ D1– D2+/GPI D2–/ THERM GND SDA SCL ADD/NTEST_OUT MR VCC 20k VCC VMON FAN_SPD/NTEST_IN INT FAN_OFF LIMIT COMPARATORS INTERRUPT STATUS REGISTERS MASK GATING CONFIGURATION REGISTER SERIAL BUS INTERFACE INT MASK REGISTER ANALOG OUTPUT REGISTER AND 8-BIT DAC VALUE AND LIMIT REGISTERS RESET GENERATOR 2 BANDGAP TEMPERATURE SENSOR 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 Office Equipment Test Equipment and Measuring Instruments GENERAL DESCRIPTION The ADM1022 is a low cost temperature monitor and fan con- troller 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-pro- cessor systems. Measured values can be read out via a serial System Manage- ment 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 3.0 V to 5.5 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 office electronics. |
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