- 82 - 6.14 Fan Tachometer Block Fan Tachometer Block provides two groups of Fan Tachometer, can be by GP40, GP41 inputs th" />
參數(shù)資料
型號: W83L951DG
廠商: Nuvoton Technology Corporation of America
文件頁數(shù): 98/112頁
文件大小: 0K
描述: IC EMBEDDED CNTRLR 128-LQFP
標(biāo)準(zhǔn)包裝: 90
系列: W83
核心處理器: 8051
芯體尺寸: 8-位
速度: 24MHz
連通性: 主機接口,PS/2,SMBus,UART/USART
外圍設(shè)備: PWM,WDT
輸入/輸出數(shù): 104
程序存儲器容量: 64KB(64K x 8)
程序存儲器類型: 閃存
RAM 容量: 2K x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b; D/A 2x8b
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 128-LQFP
包裝: 托盤
W83L951DG/W83L951FG
- 82 -
6.14 Fan Tachometer Block
Fan Tachometer Block provides two groups of Fan Tachometer, can be by GP40, GP41 inputs the
wave form and calculates automatically that corresponding Count of cycle of rotational speed is
counted. When real RPM is lower than setting value, interrupt request will occur.
Table 6-23.Fan Tachometer Register Define
FAN BLOCK(2)
EXTADDR
NAME
7
6
5
4
3
2
1
0
00
FAN1
Fan 1 Count[7:0]
01
FAN2
Fan 2 Count[7:0]
Note:
Gray: Only with System Reset to initial.
6.14.1 Register Description
6.14.1.1
FAN 1/2 Count/Limit Register (FAN1/2) (Default Value: ????_????)
Read:
Input clock=24MHz :
Current Count. RPM = (60 × 1 × 10e6) / (2 × Count × 256) = 117187.5/Count
Input clock=12MHz :
Current Count. RPM = (60 × 1 × 10e6) / (4 × Count × 256) = 58593/Count.
Write:
Set Count of tolerance of minimum RPM. When real RPM is lower than setting value, interrupt request
will occur. The relation between RPM and Count is as follows:
Input clock=24MHz :
RPM = (60 × 1 × 10e6) / (2 × Count × 256) = 117187.5/Count.
Count = 117187.5/RPM.
Input clock=12MHz :
RPM = (60 × 1 × 10e6) / (4 × Count × 256) = 58593/Count.
Count= 58593/RPM.
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