LM93CIMT National Semiconductor, LM93CIMT Datasheet - Page 61

• Manufacturer Part Number: LM93CIMT
• Description: Microprocessor Support IC
• Manufacturer: National Semiconductor

Specifications of LM93CIMT

• Peak Reflow Compatible (260 C): No
• Supply Voltage Max: 3.6V
• Leaded Process Compatible: No
• Supply Voltage Min: 3V
• Operating Temperature Min: 0��C
• Package / Case: 56-TSSOP
• Operating Temperature Max: 85°C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Register
Address
16.0 Registers
16.7.6 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
automatically 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.
BAh
BBh
B4h
B5h
B6h
B7h
B8h
B9h
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
(Continued)
Name
Bit 7
Bit 6
Bit 5
TLIMIT1[5:0]
TLIMIT2[5:0]
TLIMIT3[5:0]
TLIMIT4[5:0]
61
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
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Default
Value
FCh
FCh
FCh
FCh
FFh
FFh
FFh
FFh