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LPC47M14X датащи(PDF) 121 Page - SMSC Corporation

номер детали LPC47M14X
подробное описание детали  128 PIN ENGANCED SUPER I/O CONTROLLER WITH AN LPC INTERFACE AND USB HUB
PDF  205 Pages
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производитель  SMSC [SMSC Corporation]
домашняя страница  http://www.smsc.com
Logo SMSC - SMSC Corporation

LPC47M14X датащи(HTML) 121 Page - SMSC Corporation

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SMSC DS – LPC47M14X
Page 121
Rev. 03/19/2001
A representation of the logic for the fan tachometer implementation is shown below.
The following tables show examples of the desired functionality. Counts are based on 2 pulses per revolution
tachometer outputs with a default divisor of 2.
RPM
TIME PER
REVOLUTION
TERM 1 FOR “DIVIDE
BY 2” (DEFAULT) IN
DECIMAL
PRELOAD
COUNT =
(TERM 1) +
PRELOAD
COMMENTS
4400
13.64 ms
112 counts
32
144
Typical RPM
3080
19.48 ms
160 counts
32
192
70% RPM
2640
22.73 ms
186 counts
32
218
60% RPM
2204
27.22 ms
223 counts
32
255
(maximum count)
50% RPM
MODE
SELECT
NOMINAL
RPM
TIME PER
REVOLUTION
PRELOAD
COUNTS FOR
THE GIVEN
SPEED IN
DECIMAL
70% RPM
TIME PER
REVOLUTION
FOR 70% RPM
Divide by 1
8800
6.82 ms
32
144
6160
9.74 ms
Divide by 2
4400
13.64 ms
32
144
3080
19.48 ms
Divide by 4
2200
27.27 ms
32
144
1540
38.96 ms
Divide by 8
1100
54.54 ms
32
144
770
77.92 ms
Pins 51 and 52 are the fan tachometer inputs, FAN_TACH2 and FAN_TACH1, respectively.
The configuration registers for the fan tachometer inputs are defined in the “Runtime Registers” section.
Programmable
Divider
1, 2, 4, 8
Counter
Preload
Latch on Read
Sync
To nPME
Logic
32 kHz
MSB



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