LM63CIMAX National Semiconductor, LM63CIMAX Datasheet - Page 16

• 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

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Address
4A
2.0 LM63 Registers
LM63 Register Descriptions In Functional Order
Fan Control Registers
Hex
HEX
4A
FAN PWM AND TACHOMETER CONFIGURATION REGISTER
Read/
Write
R/W
Bits
7:6
1:0
5
4
3
2
Value
POR
00
00
1
0
0
0
(Continued)
PWM Clock
Tachometer
[Reserved]
Program
Polarity
Output
Name
Select
PWM
PWM
Mode
These bits are unused and always set to 0.
0: the PWM Value (register 4C) and the Lookup Table (50–5F) are
read-only. The PWM value (0 to 100%) is determined by the current
remote diode temperature and the Lookup Table, and can be read from
the PWM value register.
1: the PWM value (register 4C) and the Lookup Table (Register 50–5F)
are read/write enabled. Writing the PWM Value register will set the
PWM output. This is also the state during which the Lookup Table can
be written.
0: the PWM output pin will be 0 V for fan OFF and open for fan ON.
1: the PWM output pin will be open for fan OFF and 0 V for fan ON.
if 0, the master PWM clock is 360 kHz
if 1, the master PWM clock is 1.4 kHz.
Always write 0 to this bit.
00: Traditional tach input monitor, false readings when under minimum
detectable RPM.
01: Traditional tach input monitor, FFFF reading when under minimum
detectable RPM.
10: Most accurate readings, FFFF reading when under minimum
detectable RPM.
11: Least effort on programmed PWM of fan, FFFF reading when under
minimum detectable RPM.
Note: If the PWM Clock is 360 kHz, mode 00 is used regardless of the
setting of these two bits.
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Description