LM93CIMT National Semiconductor, LM93CIMT Datasheet - Page 72

• 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

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Register
Address
Register
Address
16.0 Registers
16.8.15 Register CAh PWM1 Control 3
Bits 7:5 configure the spin-up duration. When the duty cycle of PWM1 changes from zero to a non-zero value, the spin-up
sequence is activated for the specified amount of time. The available settings are defined according to this table:
16.8.16 Register CBh Special Function PWM1 Control 4
CBh
CAh
Read/
Write
R/W
Read/
Write
R/W
3:0
7:5
2:0
7:3
Bit
Bit
4
Special Function
PWM1 Control 4
Control 3
Register
PWM1
(Continued)
Name
Register
Name
SU_DUR
SU_DC
FREQ1
Name
Name
RES
RES
FREQ1 or FREQ2
Bit 7
SU_DUR
Bit 7
0h
1h
2h
3h
4h
5h
6h
7h
RES
0h
1h
2h
3h
4h
5h
6h
7h
R/W
R/W
R/W
R/W
R/W
SU_DUR
R
R
Bit 6
Bit 6
RES
This field sets the duty cycle that will be used
whenever PWM1 experiences a Spin-Up cycle. This
field accepts 16 possible values that are mapped to
duty cycles according the table in the Auto-Fan
Control section. Setting this field to 0h will effectively
disable Spin-Up.
Reserved
Sets the Spin-Up duration for PWM1.
PWM1 frequency control. Setting this value controls
the frequency of the PWM1 output according to the
table below.
Reserved
Bit 5
72
Bit 5
RES
Frequency of PWM1
Bit 4
Spin-up disabled
RES
or PWM2 (Hz)
Spin-Up Time
Bit 4
RES
1000 ms
2000 ms
4000 ms
100 ms
250 ms
400 ms
700 ms
22500
Description
Description
96
84
72
60
48
36
12
Bit 3
Bit 3
RES
Bit 2
Bit 2
SU_DC
Bit 1
FREQ1
Bit 1
Bit 0
Bit 0
Default
Default
Value
Value
00h
00h