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© Andigilog, Inc. 2006
www.andigilog.com
October 2006 - 70A05007
aSC7611
Temperature
Zone Hysteresis Hn-[3:0]
0°C
0000
1°C
0001
4°C (default)
0100
10°C
1010
15°C
1111
Table 19 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.
Miscellaneous Registers
Register 3Eh: Company ID
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
3Eh
R
Company ID
7
6
5
4
3
2
1
0
61
The company ID register contains the company identification number. For Andigilog this is 61h. This number is assigned by
Intel and is a method for uniquely identifying the part manufacturer. This register is read-only – a write to this register has no
effect.
Register 3Fh: Version/Stepping
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
3Fh
R
Version/Stepping
VER3
VER2
VER1
VER0
STP3
STP2
STP1
STP0
69
The four least significant bits of the Version/Stepping register [3:0] contain the current stepping of the aSC7611 silicon. The
four most significant bits [7:4] reflect the aSC7611 base device number when set to a value of 0110b. For the aSC7611, this
register will read 01101001b (69h).
The register is used by application software to identify which device in the hardware monitor family has been implemented in
the given system. Based on this information, software can determine which registers to read from and write to. Further,
application software may use the current stepping to implement work-around for bugs found in a specific silicon stepping.
This register is read-only – a write to this register has no effect.
Register 6Fh: Test Register
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
6Fh
R/W
Test Register
RES
RES
RES
RES
RES
RES
RES
XEN
00h
X
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