Datasheet

LM96163

www.ti.com

SNAS433D –JUNE 2008–REVISED MAY 2013

[HEX] [HEX]

ID AND TEST REGISTERS

FE Manufacturer ID Read Only 01

FF Stepping/Die Rev. ID Read Only 49

[RESERVED] REGISTERS—NOT USED

06 Not Used N/A N/A

0C Not Used N/A N/A

15 Not Used N/A N/A

17-18 Not Used N/A N/A

1A–20 Not Used N/A N/A

22–29 Not Used N/A N/A

34–44 Not Used N/A N/A

68–BE Not Used N/A N/A

C0–FD Not Used N/A N/A

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:

Step [Register]

HEX

and Setup Instructions

(1)

1 After power up check to make sure that the Not Ready bit is cleared in the POR Status register [33] bit 7.

2 Enable or disable Remote Diode TruTherm mode, [30] bit 1.

3 [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.

4 [4B] Write bits 0 through 5 to program the spin-up settings.

5 [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].

6 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

B. [4C] the PWM value bits 0 through 5 or bits 0 through 7 if extended duty cycle resolution is selected.

7 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.

(1) All other registers can be written at any time after the above sequence.

Product Folder Links: LM96163