Rainbow-electronics LM96000 Manual de usuario

LM96000Hardware Monitor with Integrated Fan ControlGeneral DescriptionThe LM96000, hardware monitor, has a two wire digitalinterface compatible with S

Functional Description (Continued)RegisterAddressRead/WriteRegisterNameBit 7(MSB)Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0(LSB)DefaultValueLock?49h R/

Functional Description (Continued)RegisterAddressRead/WriteRegisterNameBit 7(MSB)Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0(LSB)DefaultValueLock?6Fh R/

Functional Description (Continued)TABLE 1. Temperature vs Register Reading (Continued)Temperature Reading (Dec) Reading (Hex)...0˚C 0 00h...

Functional Description (Continued)Current Duty Value (Decimal) Value (Hex)0.3922% 1 01h...25.098% 64 40h...50.196% 128 80h...100% 25

Functional Description (Continued)Bit Name R/W Default Description0 START R/W 0 When software writesa1tothis bit, the LM96000 fan monitoring and PWMou

Functional Description (Continued)Bit Name R/W Default Description4 Zone 1 LimitExceededR 0 The LM96000 automatically sets this bit to 1 when the temp

Functional Description (Continued)Bit Name R/W Default Description7 Remote Diode2 FaultR 0 The LM96000 automatically sets this bit to 1 when there is

Functional Description (Continued)RegisterAddressRead/WriteRegisterNameBit 7(MSB)Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0(LSB)DefaultValue50h R/W Pro

Functional Description (Continued)to ensure that the limit is high enough not to cause sporadic alerts. The fan tachometer will not cause a bit to be

Functional Description (Continued)TABLE 5. Fan Spin-Up RegisterSPIN[2:0] Spin Up Time000 0 sec001 100 ms010 250 ms011 400 ms100 700 ms101 1000 ms110 2

Connection Diagram24 Pin TSSOP20084602NS Package MTC24ETop ViewLM96000CIMT (61 units per rail), orLM96000CIMTX (2500 units per tape and reel)Pin Descr

Functional Description (Continued)Above (Zone 1 Fan Temp Limit) + (Zone 1 Range), the duty cycle will be 100%.PWM frequency bits [3:0]The PWM frequenc

Functional Description (Continued)RegisterAddressRead/WriteRegisterNameBit 7(MSB)Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0(LSB)DefaultValueLock?63h R/

Functional Description (Continued)4.17 Registers 64-66h: Minimum PWM Duty CycleRegisterAddressRead/WriteRegisterNameBit 7(MSB)Bit 6 Bit 5 Bit 4 Bit 3

Functional Description (Continued)25.7KHz PWM FrequencyPWM Duty CycleLevel (%) Value in Decimal Value in Hex0007.14 1 - 17 01 - 1114.29 18 - 36 12 - 2

Functional Description (Continued)TABLE 10. Temperature Limit vs Register Setting (Continued)Temperature Reading (Decimal) Reading (Hex)0˚C 0 00h...

Functional Description (Continued)– The fan will remain on, at Fan PWM Minimum, until the temperature goes a certain amount below Fan Temp Limit.– The

Functional Description (Continued)•Mode 2: This mode is optimized for accurate RPM readings and activates circuitry that extends the lower side of the

Applications Information20084609Typical Applications SchematicLM96000www.national.com27

Physical Dimensions inches (millimeters) unless otherwise noted24-Lead Molded TSSOP Package,Order Number LM96000CIMT or LM96000CIMTXNS Package Number

Pin Descriptions (Continued)Symbol Pin Type Name and Function/ConnectionRemoteRemote1+ 18 Remote ThermalDiode PositiveInputPositive input (current sou

Absolute Maximum Ratings (Notes 1, 2)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distr

DC Electrical Characteristics (Continued)The following specifications apply for V+ = 3.0V to 3.6V, and all analog input source impedance RS=50Ω unless

AC Electrical Characteristics (Continued)The following specifications apply for V+ = 3.0V to 3.6V unless otherwise specified in conditions. Boldface l

Pin#PinName Circuit All Input Circuits1 SMBDAT ACircuit A2 SMBCLK3 GND B4 3.3V5 VID0 ACircuit B6 VID17 VID28 VID39 TACH310 PWM2Circuit C11 TACH112 TAC

Note 14: Holding the SMBDAT and/or SMBCLK lines Low for a time interval greater than tTIMEOUTwill reset the LM96000’s SMBus state machine, therefore s

Functional Description (Continued)1. Set limits and parameters (not necessarily in this order):– [5F-61h] Set PWM frequencies and auto fan control ran