參數(shù)資料
型號： ST72T141K2M3XXX
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDSO34
封裝： 0.300 INCH, PLASTIC, SO-34
文件頁數(shù)： 74/132頁
文件大?。?/td> 1494K
代理商： ST72T141K2M3XXX
ST72141K
46/132
MOTOR CONTROLLER (Cont’d)
Sensorless Mode
This mode is used to detect BEMF zero crossing
and end of demagnetization events.
The analog phase multiplexer connects the non-
excited motor winding to an analog 100mV hyster-
esis comparator referred to a selectable reference
voltage.
The VR[1:0] bits in the MCRB register select the
reference voltage from four internal values de-
pending on the noise level and the application volt-
age supply.
BEMF detections are performed during the meas-
urement window, when the excited windings are
free-wheeling through the low side switches and
diodes. At this stage the common star connection
voltage is near to ground voltage (instead of VDD/2
when the excited windings are powered) and the
complete BEMF voltage is present on the non-ex-
cited winding terminal, referred to the ground ter-
minal.
The zero crossing sampling frequency is then de-
fined, in current mode, by the measurement win-
dow generator frequency (SA[3:0] bits in the
MPRSR register) or, in voltage mode, by the 16-bit
Timer PWM frequency and duty cycle.
During a short period after a phase commutation
(C event), the winding is no longer excited but
needs a demagnetisation phase during which the
BEMF cannot be read. A demagnetization current
goes through the free-wheeling diodes and the
winding voltage is stuck at the high voltage or to
the ground terminal. For this reason an “end of de-
magnetization event” D must be detected on the
winding before the detector can sense a BEMF
zero crossing.
For the end-of-demagnetization detection, no spe-
cial PWM configuration is needed, the comparator
sensing is done at a fixed 800kHz sampling fre-
quency.
So, the three events: C (commutation), D (demag-
netization) and Z (BEMF zero crossing) must al-
ways occur in this order.
The comparator output is processed by a detector
that automatically recognizes the D or Z event, de-
pending on the CPB or ZVD edge and level config-
uration bits as described in Table 12.
A 20
s filter after a C event disables a D event if
spurious spikes occur.
Another 20
s filter after a D event disables a Z
event if spurious spikes occur.
Table 12. ZVD and CPB Edge Selection Bits
ZVD bit
CPB bit
Event generation vs input data sampled
00
01
10
11
Note: The ZVD bit is located in the MPAR register, the CPB bit is in the MCRB register.
CDH
Z
20-s filter
CDH
Z
20-s filter
CDH
Z
20-s filter
CDH
Z
20-s filter
相關(guān)PDF資料
PDF描述
ST72T141K2MARE 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDSO34
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST72T141K2M6 功能描述:8位微控制器 -MCU OTP EPROM 8K SPI RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST72T212G2B6 功能描述:8位微控制器 -MCU OTP EPROM 8K SPI RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST72T212G2M6 功能描述:8位微控制器 -MCU OTP EPROM 8K SPI RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST72T213G1B6 功能描述:8位微控制器 -MCU OTP EPROM 4K SPI RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
ST72T213G1M6 功能描述:8位微控制器 -MCU OTP EPROM 4K SPI RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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