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ADT7462ACPZ-REEL Arkusz danych(PDF) 1 Page - Analog Devices |
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ADT7462ACPZ-REEL Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 92 page Flexible Temperature and Voltage Monitor and System Fan Controller ADT7462 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved. FEATURES One local and up to three remote temperature channels Series resistance cancellation on remote channels Thermal protection using THERM pins Up to four PWM fan drive outputs Supports both high and low frequency PWM drives Up to eight TACH inputs Measures the speed of 3-wire and 4-wire fans Automatic fan speed control loop Includes dynamic TMIN control Monitors up to 13 voltage inputs Monitors up to 7 VID inputs Includes VID-on-fly support Bidirectional reset Chassis intrusion detect SMBus 1.1- and SMBus 1.0-compatible 3.3 V and 5 V operation Extended operating range from −40°C to +125°C Space-saving 32-lead chip scale package APPLICATIONS Servers and personal computers Telecommunications equipment Test equipment and measurement instruments GENERAL DESCRIPTION The ADT7462 is a flexible systems monitor IC, suitable for use in a wide variety of applications. It can monitor temperature in up to three remote locations, as well as its ambient temperature. There are up to four PWM outputs. These can be used to control the speed of a cooling fan by varying the % duty cycle of the PWM drive signal applied to the fan. The ADT7462 supports high frequency PWM for 4-wire fans and low frequency PWM for 2-wire and 3-wire fans. There are up to eight TACH inputs, which can be used to measure the speed of 3-wire and 4-wire fans. There are up to 13 voltage monitoring inputs, ranging from 12 V to 0.9 V. The ADT7462 is fully compatible with SMBus 1.1 and SMBus 1.0. The ADT7462 also includes a THERM I/O and a RESET I/O. The ADT7462 is available in a 32-lead LFCSP_VQ. Many of the pins are multifunctional. There are five easy configuration options, which are set up using the easy configuration register. Users pick the configuration closest to their requirements; individual pins can be reconfigured after the easy configuration option has been chosen. FUNCTIONAL BLOCK DIAGRAM SMBus ADDRESS SELECTION SERIAL BUS INTERFACE VID REGISTER PWM REGISTERS ADDRESS POINTER REGISTER PWM CONFIGURATION REGISTERS INTERRUPT MASKING RESET CIRCUIT GPIO STATUS AND CONFIGURATION REGISTERS SCSI STATUS PERFORMANCE MONITORING THERMAL PROTECTION INPUT SIGNAL CONDITIONING AND ANALOG MULTIPLEXER BAND GAP TEMPERATURE SENSOR VID0 TO VID6 PWM1 TO PWM4 TACH1 TO TACH8 VR_HOT2 SCSI_TERM1 AND SCSI_TERM2 VR_HOT1 THERM2 THERMAL DIODE INPUTS VOLTAGE INPUTS ADT7462 VALUE AND LIMIT REGISTERS LIMIT COMPARATORS INTERRUPT STATUS REGISTERS AUTOMATIC FAN SPEED CONTROL ACOUSTIC ENHANCEMENT CONTROL DYNAMIC TMIN CONTROL 13-BIT ADC BAND GAP REFERENCE GPIO1 TO GPIO8 RESET CI GND SMBus ADDRESS SCL SDA ALERT FAN SPEED COUNTER FAN2MAX THERM1 Figure 1. |
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