參數(shù)資料
型號(hào)： LM85
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： Hardware Monitor with Integrated Fan Control
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO24
封裝： QSOP-24
文件頁(yè)數(shù)： 12/26頁(yè)
文件大?。?/td> 261K
代理商： LM85
Functional Description
(Continued)
Current Duty
.
.
.
50.196%
.
.
.
100%
Value (Decimal)
.
.
.
128
.
.
.
255
Value (Hex)
.
.
.
80h
.
.
.
FFh
4.5 Register 3Eh: Company ID
Register
Address
3Eh
Read/
Write
R
Register
Name
Company ID
Bit 7
(MSB)
7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
0
Default
Value
01h
6
5
4
3
2
1
The company ID register contains the company identification number. For National Semiconductor this is 01h. 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.
4.6 Register 3Fh: Version/Stepping
Register
Address
3Fh
Read/
Write
R
Register
Name
Version/Stepping
Bit 7
(MSB)
VER3
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
STP0
Default
Value
60h
VER2
VER1
VER0
STP3
STP2
STP1
The four least significant bits of the Version/Stepping register [3.0] contain the current stepping of the LM85 silicon. The four most
significant bits [7.4] reflect the LM85 base device number when set to a value of 0110b. All LM85 revisions will have a base
number of 6. For the LM85C, this register will read 01100000b (60h). The LM85B will read 01100010b (62h).If new revisions of
the LM85C or LM85B are released the last 4 bits of this register will change.
The register is used by application software to identify which device in the hardware monitor family of ASICs 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-arounds for bugs found in a specific silicon
stepping.
This register is read only — a write to this register has no effect.
4.7 Register 40h: Ready/Lock/Start/Override
Register
Address
40h
Read/
Write
R/W
Register
Name
Ready/Lock/Start/Override
Bit 7
(MSB)
RES
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
START
Default
Value
00h
RES
RES
RES
OVRID
READY
LOCK
Bit
0
Name
START
R/W
R/W
Default
0
Description
When software writes a 1 to this bit, the LM85 fan monitoring and PWM output
control functions will use the values set in the fan control limit and parameter
registers (address 5Ch through 6Eh). Before this bit is set, the LM85 will not
update the used register values, the default values will remain in effect.
Whenever this bit is set to 0, the LM85 fan monitoring and PWM output control
functions use the default fan limits and parameters, regardless of the current
values in the limit and parameter registers (5C through 6Eh). The LM85 will
preserve the values currently stored in the limit and parameter registers when
this bit is set or cleared. This bit becomes read only when the
Ready/Lock/Start/Override register Lock bit is set.
It is expected that all limit and parameter registers will be set by BIOS or
application software prior to setting this bit.
L
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