參數(shù)資料
型號(hào)： LM79CCVFX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PQFP44
封裝： 10 X 10 MM, PLASTIC, QFP-44
文件頁(yè)數(shù)： 21/31頁(yè)
文件大?。?/td> 469K
代理商： LM79CCVFX
Functional Description (Continued)
13.10 VID/Fan Divisor Register — Address 47h
Power on – <7:4> is 0101, and <3:0>is mapped to VID <3:0>
Bit
Name
Read/Write
Description
3-0
VID <3:0>
Read Only
The VID <3:0> inputs
5-4
FAN1 RPM
Control
Read/Write
FAN1 Speed Control.
<5:4> = 00 - divide by 1;
<5:4> = 01 - divide by 2;
<5:4> = 10 - divide by 4;
<5:4> = 11 - divide by 8.
7-6
FAN2 RPM
Control
Read/Write
FAN2 Speed Control.
<7:6> = 00 - divide by 1;
<7:6> = 01 - divide by 2;
<7:6> = 10 - divide by 4;
<7:6> = 11 - divide by 8.
13.11 Serial Bus Address Register — Address 48h
Power on default Serial Bus address <6:0> = 0101101 and <7> = 0 binary
Bit
Name
Read/Write
Description
6-0
Serial Bus
Address
Read/Write
Serial Bus address <6:0>
7
Reserved
Read Only
13.12 Chip Reset/VID4/Device ID Register Address 49h
Power on default for the latest version of LM79 <7:0> = 1100 000X.
Bit
Name
Read/Write
Description
0
VID4
Read Only
VID4 input
4-1
Reserved
Read Only
5
Chip Reset
Read/Write
A one will reset all the registers of the LM79 to the power on default state.
6
Reserved
Read Only
7
Device ID
Read Only
LM79 device identification. The LM78 has <7> = 0.
13.13 POST RAM — Address 00h–1Fh
The address pointer for the POST RAM auto-increments when written to at Port x0h or x4h. Once the address pointer reaches
1Fh, a FIFO overflow interrupt will be generated and the FIFO will stop incrementing. Normal reads via Port x5h and x6h
auto-increment a separate pointer, and will not cause a FIFO overflow interrupt.
13.14 Value RAM — Address 20h–3Fh or 60h–7Fh (auto-increment)
Address A6–A0
Address A6–A0 with
Auto-Increment
Description
20h
60h
IN0 reading
21h
61h
IN1 reading
22h
62h
IN2 reading
23h
63h
IN3 reading
24h
64h
IN4 reading
25h
65h
-IN5 reading
26h
66h
-IN6 reading
27h
67h
Temperature reading
LM79
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