Rainbow Electronics LM93 - Manual (Page 72)

16.0 Registers
(Continued)
16.8.15 Register CAh PWM1 Control 3
Register
Address
Read/
Write
Register
Name
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Default
Value
CAh R/W
PWM1
Control 3
SU_DUR RES SU_DC 00h
Bit Name R/W Description
3:0 SU_DC R/W 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.
4 RES R Reserved
7:5 SU_DUR R/W Sets the Spin-Up duration for PWM1.
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:
SU_DUR Spin-Up Time
0h Spin-up disabled
1h 100 ms
2h 250 ms
3h 400 ms
4h 700 ms
5h 1000 ms
6h 2000 ms
7h 4000 ms
16.8.16 Register CBh Special Function PWM1 Control 4
Register
Address
Read/
Write
Register
Name
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Default
Value
CBh R/W
Special Function
PWM1 Control 4
RES RES RES RES RES FREQ1 00h
Bit Name R/W Description
2:0 FREQ1 R/W PWM1 frequency control. Setting this value controls
the frequency of the PWM1 output according to the
table below.
7:3 RES R Reserved
FREQ1 or FREQ2
Frequency of PWM1
or PWM2 (Hz)
0h 22500
1h 96
2h 84
3h 72
4h 60
5h 48
6h 36
7h 12
LM93
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