LM63CIMAX National Semiconductor, LM63CIMAX Datasheet - Page 15

• Manufacturer Part Number: LM63CIMAX
• Description: IC,Motor Controller,MOS,SOP,8PIN
• Manufacturer: National Semiconductor

Specifications of LM63CIMAX

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ALERT STATUS AND MASK REGISTERS
ID AND TEST REGISTERS
[RESERVED] REGISTERS — NOT USED
Register
2.0 LM63 Registers
C0–FD
2.3 LM63 INITIAL REGISTER SEQUENCE AND REGISTER DESCRIPTIONS IN FUNCTIONAL ORDER
The following is a Register Map grouped in functional and sequence order. Some address locations have been left blank to
maintain compatibility with LM86. Addresses in parenthesis are mirrors of named address for backwards compatibility with some
older software. Reading or writing either address will access the same 8-bit register.
2.3.1 LM63 Required Initial Fan Control Register Sequence
Important! The BIOS must follow the sequence below to configure the following Fan Registers for the LM63 before using any of
the Fan or Tachometer or PWM registers:
All other registers can be written at any time after the above sequence.
60–BE
1A–1F
22–2F
30–3F
40–45
[HEX]
Step
0C
FF
4E
02
16
06
15
17
18
20
1
2
3
4
5
ALERT Status
ALERT Mask
Stepping/Die Rev. ID
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
[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.
Choose, then write, only one of the following:
A. [4F–5F] the Lookup Table, or
B. [4C] the PWM value bits 0 through 5.
If Step 4A, Lookup Table, was chosen and written then write [4A] bit 5 = 0.
(Continued)
Register Name
[Register]
HEX
15
and Setup Instructions
Read/Write
Read Only
Read Only
R/W
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
POR Default
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[HEX]
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
A4
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