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© Andigilog, Inc. 2006
www.andigilog.com
October 2006 - 70A06010
aSC7621
Register 6D-6Eh: Thermal Zone Hysteresis
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
6Dh
R/W
Zone 1 and
Zone 2
Hysteresis
H1-3
H1-2
H1-1
H1-0
H2-3
H2-2
H2-1
H2-0
44
X
6Eh
R/W
Zone 3 and
Zone 4
Hysteresis
H3-3
H3-2
H3-1
H3-0
H4-3
H4-2
H4-1
H4-0
44
X
If the temperature is above Fan Temp Limit, then drops below Fan Temp Limit, the following will occur:
•
The fan will remain on, at Fan PWM Minimum, until the temperature goes a certain amount below Fan Temp Limit.
•
The Hysteresis registers control this amount. See below table for details, all values from 0°C to 15°C are possible.
This register becomes read-only when the Ready/Lock/Start/Override register Lock bit is set. Any further attempts to write to
these registers shall have no effect.
Temperature
Zone Hysteresis Hn-[3:0]
0°C
0000
1°C
0001
4°C (default)
0100
10°C
1010
15°C
1111
Table 28 Zone Hysteresis Register Format
Register 75h: Fan Spin-Up Mode
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
75h
R/W
Fan Spin-
Up Mode
Tach4
Disable
Tach3/4
Disable
Tach2
Disable
Tach1
Disable
RES
PWM3
SU
PWM2
SU
PWM1
SU
00
X
The PWM SU bit configures the PWM spin-up mode. If PWM SU is cleared the spin-up time will terminate after time
programmed by the Fan Configuration register has elapsed. When set to 1, the spin-up time will terminate early if the TACH
reading interpreted as RPM exceeds the Tach Minimum RPM value or after the time programmed by the Fan Configuration
register has elapsed, which ever occurs first. Note that the magnitudes of the tach readings and the limits in the registers
represent a time period that is inversely proportional to RPM.
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.
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