參數(shù)資料
型號(hào)： ST72141K2B3/XXX
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封裝： 0.400 INCH, PLASTIC, SDIP-32
文件頁數(shù)： 92/133頁
文件大?。?/td> 2615K
代理商： ST72141K2B3/XXX
Obsolete
Product(s)
- Obsolete
Product(s)
ST72141K2
61/133
MOTOR CONTROLLER (Cont’d)
The measurement window frequency can be pro-
grammed between 195Hz and 25KHz by the
means of the SA[3:0] bits in the MPRSR register.
In sensorless mode this measurement window can
be used to detect either End of Demagnetization
or BEMF zero crossing events. Its width can be
defined between 5
μs and 30μs in sensorless mode
by the OT[1:0] bits in the MPOL register. In sensor
mode (SR=1) this off time is fixed at 1.25
μs.
Table 23. Off-Time Table
Table 24. Sampling Frequency Selection
Figure 38. Sampling clock generation block
OT1
bit
OT0
bit
Off-Time
Sensorless Mode
(SR bit=0)
Off-Time
Sensor Mode
(SR bit =1)
00
5
μs
1.25
μs
0
1
10
μs
1
0
15
μs
1
30
μs
SA3
SA2
SA1
SA0
Sampling Frequency
00
25.0 KHz
00
01
20.0 KHz
00
10
18.1 KHz
00
11
15.4 KHz
01
00
12.5 KHz
01
10.0 KHz
0
1
0
6.25 KHz
0
1
3.13 KHz
1
0
1.56 KHz
1
0
1
1.25 KHz
1
0
1
0
1.14 KHz
1
0
1
961 Hz
1
0
781 Hz
1
0
1
625 Hz
1
0
390 Hz
1
195 Hz
Frequency logic
4 MHz1
Off-Time logic
S
Q
R
4
SA[3:0] bits
2
OT[1:0] bits
Toff
Tsampling
(1) The MTC controller input frequency must always be 4 MHz,
whatever the crystal frequency is. The appropriate internal
frequency can be selected in the Miscellaneous register.
MPRSR Register
MPOL Register
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參數(shù)描述
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