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LM94 Datasheet(PDF) 2 Page - Texas Instruments |
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LM94 Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 112 page  CONFIGURATION AND IDENTIFICATION REGISTERS 8-Bit 6' ADC VOLTAGE REFERENCE INPUT ATTENUATORS, EXTERNAL DIODE SIGNAL CONDITIONING, AND ANALOG MULTIPLEXER ADDRESS POINTER REGISTER STEPPING AND DEVICE ID REGISTERS VDD SERIAL BUS INTERFACE SMBDAT Address Select PROCHOT AND VRD_HOT DETECT/CONTROL LOGIC DYNAMIC VCCP MONITORING *Note: These pins may be used for ±12V with external resistor dividers. The thevenin equivalent resistance at the pin must be between 1k and 7k. SMBCLK FAN TACH/ GPIO/GPI GPIO_0/TACH1 GPIO_1/TACH2 GPIO_2/TACH3 GPIO_3/TACH4 GPIO_4 GPIO_5 ALERT/XtestOut VALUE REGISTERS LIMIT REGISTERS HOST STATUS REGISTERS BMC STATUS REGISTERS FAN CONTROL CONFIG REGISTERS, LOOKUP TABLES, and PI LOOP PARAMETERS SLEEP STATE CONTROL AND MASK REGISTERS GPI AND OTHER MASK REGISTERS TEMPERATURE READING DIGITAL FILTER PWM FAN CONTROL PWM1 PWM2 GPIO_6 GPIO_7 GPI8 GPI9 + - VREF VREF (2.5V) 3.3SBY (AD_IN 16) AD_IN2(1.236V)/REMOTE2b+* AD_IN3(1.236V)* AD_IN10(6.67V) P1_PROCHOT REMOTE1a+ REMOTE1- REMOTE2- REMOTE2a+ AD_IN12(2.625V) AD_IN13(1.312V) AD_IN14(1.312V) AD_IN1(1.236V)/REMOTE1b+* AD_IN4(1.6V) AD_IN5(2V) AD_IN6(2V) AD_IN9(4.4V) P2_VID0/P2_VID7 P2_VID6 P1_VID0/P1_VID7 P1_VID6 AD_IN8(1.6V;P2_Vccp) AD_IN7(1.6V;P1_Vccp) AD_IN11(3.33V) P2_PROCHOT P1_VRD_HOT P2_VRD_HOT AD_IN15(1.236V)* INTERNAL TEMP SENSOR RESET# LM94 SNAS264C – APRIL 2006 – REVISED MARCH 2013 www.ti.com Description (continued) To set fan speed, the LM94 has two PWM outputs that are each controlled by up to six temperature zones. The fan-control algorithm can be based on a lookup table, PI (proportional/integral) control loop, or a combination of both. The LM94 includes digital filters that can be invoked to smooth temperature readings for better control of fan speed such that acoustical noise is minimized. The LM94 has four tachometer inputs to measure fan speed. Limit and status registers for all measured values are included. The LM94 builds upon the functionality of previous motherboard server management ASICs, such as the LM93. It also adds measurement and control support for dynamic Vccp monitoring for VRD10/11 and PROCHOT. It is designed to monitor a dual processor Xeon class motherboard with a minimum of external components. Block Diagram The block diagram of LM94 hardware is illustrated below. The hardware implementation is a single chip ASIC solution. 2 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LM94 |
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