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型号： ST72T141K2MARE
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDSO34
封装： 0.300 INCH, LEAD FREE, PLASTIC, SOP-34
文件页数： 65/131页
文件大小： 3096K
代理商： ST72T141K2MARE
ST72141K2-Auto
39/131
8 ON-CHIP PERIPHERALS
8.1 MOTOR CONTROLLER (MTC)
8.1.1 Introduction
The ST7 Motor Controller (MTC) can be seen as a
Pulse Width Modulator multiplexed on six output
channels,
and
a
Back
Electromotive
Force
(BEMF) zero-crossing detector for sensorless con-
trol of Permanent Magnet Direct Current (PMDC)
brushless motors.
The MTC is particularly suited to driving synchro-
nous motors and supports operating modes like:
– Commutation step control with motor voltage
regulation and current limitation
– Commutation step control with motor current
regulation, i.e. direct torque control
– Sensor or sensorless motor phase commutation
control
– BEMF zero-crossing detection with high sensitiv-
ity. The integrated phase voltage comparator is
directly referred to the full BEMF voltage without
any attenuation. A BEMF voltage down to
200mV can be detected, providing high noise im-
munity and self-commutated operation in a large
speed range.
– Realtime motor winding demagnetization detec-
tion for fine-tuning the phase voltage masking
time to be applied before BEMF monitoring.
– Automatic and programmable delay between
BEMF zero-crossing detection and motor phase
commutation.
8.1.2 Main Features
■ 2 on-chip analog comparators, one for BEMF
zero-crossing detection with 100mV hysteresis,
the other for current regulation or limitation
■ 4
selectable
reference
voltages
for
the
hysteresis comparator (0.2 V, 0.6 V, 1.2 V,
2.5 V)
■ 8-bit timer (MTIM) with two compare registers
and two capture features
■ Measurement
window generator for BEMF
zero-crossing detection
■ Auto-calibrated prescaler with 16 division steps
■ 8x8-bit multiplier
■ Phase input multiplexer
■ Sophisticated output management:
– The six output channels can be split into two
groups (odd and even).
– The PWM signal can be multiplexed on even,
odd or both groups, alternatively or simultane-
ously.
– The output polarity is programmable channel
by channel.
– An software enabled bit (active low) forces the
outputs in HiZ.
– An “emergency stop” input pin (active low)
asynchronously forces the outputs in HiZ.
Table 10. MTC Registers
8.1.3 Application Example
This example shows a six-step command se-
quence for a 3-phase permanent magnet DC
brushless motor (PMDC motor). Figure 26 shows
the phase steps and voltage, while Table 11
shows the relevant phase configurations.
To run this kind of motor efficiently, an autoswitch-
ing mode has to be used, that is, the position of the
rotor must self-generate the powered winding
commutation. The BEMF zero crossing (Z event)
on the non-excited winding is used by the MTC as
a rotor position sensor. The delay between this
event and the commutation is computed by the
MTC and the commutation event Cn is automati-
cally generated after this delay.
After the commutation occurs, the MTC waits until
the winding is completely demagnetized by the
free-wheeling diode: during this phase the winding
is tied to 0V or to the HV high voltage rail and no
BEMF can be read. At the end of this phase a new
BEMF zero-crossing detection is enabled.
The end of demagnetization event (D), is also de-
tected by the MTC or simulated with a timer com-
pare feature when no detection is possible.
Register Description
Page
MTIM
Timer Counter Register
66
MZPRV
Capture Zn-1 Register
66
MZREG
Capture Zn Register
66
MCOMP Compare Cn+1 Register
66
MDREG
Demagnetization Register
66
MWGHT An Weight Register
66
MPRSR
Prescaler and Sampling Register
66
MIMR
Interrupt Mask Register
67
MISR
Interrupt Status Register
67
MCRA
Control Register A
68
MCRB
Control Register B
69
MPHST
Phase State Register
70
MPAR
Parity Register
70
MPOL
Polarity Register
70
相关PDF资料
PDF描述
ST7FL09Y0MATRE 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PDSO16
ST7FL09Y0MBE 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PDSO16
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ST7FL05Y0MBTRE 8-BIT, FLASH, 16 MHz, MICROCONTROLLER, PDSO16
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