Rainbow Electronics LM96000 - Manual (Page 20)

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 frequency bits [3:0] determine the PWM frequency for the fan.The LM96000 has high and low frequency ranges for the
PWM outputs, that are controlled by the HLFRQ bit.
PWM Frequency Selection (Default = 0011 = 30.04 Hz).
TABLE 6. Register Setting vs PWM Frequency
HLFRQ Freq [2:0] PWM Frequency
0 000 10.01 Hz
0 001 15.02 Hz
0 010 23.14 Hz
0 011 30.04 Hz
0 100 38.16 Hz
0 101 47.06 Hz
0 110 61.38 Hz
0 111 94.12 Hz
1 000 22.5 kHz
1 001 24 kHz
1 010 25.7 kHz
1 011 25.7 kHz
1 100 27.7 kHz
1 101 27.7 kHz
1 110 30 kHz
1 111 30 kHz
Range Selection RAN [3:0]
RAN [3:0] Range (˚C)
0000 2
0001 2.5
0010 3.33
0011 4
0100 5
0101 6.67
0110 8
0111 10
1000 13.33
1001 16
1010 20
1011 26.67
1100 32
1101 40
1110 53.33
1111 80
This register becomes Read Only when the Ready/Lock/Start/Override register Lock bit is set. Any further attempts to write to this
register shall have no effect. After power up the default value is used whenever the Ready/Lock/Start/Override register Start bit
is cleared even though modifications to this register are possible.
4.16 Registers 62, 63h: Min/Off, Spike Smoothing
Register
Address
Read/
Write
Register
Name
Bit 7
(MSB)
Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
(LSB)
Default
Value
Lock?
62h R/W Min/Off, Zone1 Spike Smoothing OFF3 OFF2 OFF1 RES ZN1E ZN1-2 ZN1-1 ZN1-0 00h U
LM96000
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