LM96194CISQ/NOPB National Semiconductor, LM96194CISQ/NOPB Datasheet - Page 70

• Manufacturer Part Number: LM96194CISQ/NOPB
• Description: IC TRUTHERM HDWR MONITOR 48-LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®, TruTherm®r

Specifications of LM96194CISQ/NOPB

• Function: Fan Control, Temp Monitor
• Topology: ADC (Sigma Delta), Comparator, Fan Control, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 85°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM96194CISQTR

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16.12.9 Register B4–BBh Fan Tach Limit Registers
If a tachometer reading exceeds its limit (as defined by these registers) the corresponding bit is set in the Host and BMC Error
Status registers. The fan tachometer readings can be associated with a particular PWM output, but the tach errors are not auto-
matically masked when a PWM is at 0% or set to level that causes the fan RPM to be below the limit purposely. In order to prevent
false errors, care needs to be taken to make sure that the Fan Tach Limits are properly set. Errors are never generated for a fan
if its limit is set to 3FFFh.
Register
Address
B4h
B5h
B6h
B7h
B8h
B9h
BAh
BBh
Read/
Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Fan Tach 1
Fan Tach 1
Fan Tach 2
Fan Tach 2
Fan Tach 3
Fan Tach 3
Fan Tach 4
Fan Tach 4
Limit MSB
Limit MSB
Limit MSB
Limit MSB
Limit LSB
Limit LSB
Limit LSB
Limit LSB
Register
Name
Bit 7
Bit 6
70
Bit 5
TLIMIT1[5:0]
TLIMIT2[5:0]
TLIMIT3[5:0]
TLIMIT4[5:0]
Bit 4
TLIMIT1[13:6]
TLIMIT2[13:6]
TLIMIT1[13:6]
TLIMIT4[13:6]
Bit 3
Bit 2
Bit 1
RES
RES
RES
RES
Bit 0
Default
Value
FCh
FFh
FCh
FFh
FCh
FFh
FCh
FFh