lm96163cisdx-1 National Semiconductor Corporation, lm96163cisdx-1 Datasheet - Page 18

• Manufacturer Part Number: lm96163cisdx-1
• Description: Remote Diode Digital Temperature Sensor With Integrated Fan Control And Trutherm Bjt Transistor Beta Compensation Technology
• Manufacturer: National Semiconductor Corporation

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[RESERVED] REGISTERS—NOT USED
Register
C0–FD
68–BE
1A–20
2.3 LM96163 REQUIRED INITIAL FAN CONTROL REGISTER SEQUENCE
Important! The BIOS or firmware must follow the sequence below to configure the following Fan Registers for the LM96163 before
using any of the Fan or Tachometer or PWM registers:
All other registers can be written at any time after the above sequence.
[HEX]
22–29
34–44
17-18
Step
0C
FF
06
15
1
2
3
4
5
6
7
Stepping/Die Rev. ID
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
After power up check to make sure that the Not Ready bit is cleared in the POR Status register [33] bit 7.
Enable or disable Remote Diode TruTherm mode, [30] bit 1.
[4A] Write bits 0 and 1; 3 and 4. This includes tach settings if used, PWM internal clock select (1.4 kHz or 360 kHz) and
PWM Output Polarity.
[4B] Write bits 0 through 5 to program the spin-up settings.
[4D] Write bits 0 through 4 to set the frequency settings. This works with the PWM internal clock select. If 22.5 kHz is
selected then enhanced fan control functions such as Lookup Table transition smoothing with extended PWM duty cycle
resolution is available and should be setup [45].
Choose, then write, only one of the following:
A. [4F–67] the Lookup Table and [4E] the Lookup Table Offset, [45] Lookup Table Temperature Resolution can also be
modified
or
B. [4C] the PWM value bits 0 through 5 or bits 0 through 7 if extended duty cycle resolution is selected.
If Step 4A, Lookup Table, was chosen and written then write [4A] bit 5 PWPGM = 0. PWPGM should be set to 1 to enable
writing to the fan control registers listed in this table.
Register Name
[Register]
HEX
18
and Setup Instructions
Read/Write
Read Only
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
POR Default
[HEX]
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
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