ST92141 STMicroelectronics, ST92141 Datasheet - Page 116

• Manufacturer Part Number: ST92141
• Description: 8/16-bit Mcu For 3-phase Ac Motor Control
• Manufacturer: STMicroelectronics

ST92141 - 3-PHASE INDUCTION MOTOR CONTROLLER (IMC)
7.4 3-PHASE INDUCTION MOTOR CONTROLLER (IMC)
7.4.1 Introduction
The IMC controller is designed for variable speed
motor control applications. Three PWM outputs
are available for controlling a three-phase motor
drive. Rotor speed feedback is provided by captur-
ing a tachogenerator input signal.
7.4.2 Main Features
Figure 63. IMC Controller Block Diagram
116/179
INTCLK
ZPC Int.
TACHO
ADT Int.
ZPC Int.
10-bit PWM Up/Down Counter
Classical and zerocentered PWM operating
modes
Full-scale PWM generation
6-bit dead time generator
Rotor speed measurement
8 interrupt sources + 1 NMI
NMI
9
PWM Counter
Prescaler Reg.
8-bit Prescaler
8-Bit Repetition
8-bit Repetition
Down-Counter
CPT=0
Counter Reg.
CPT=0
DIV 2
NMI Control
Logic
NMIE
bit
NMIL
bit
NMI Int.
11-bit Preload Compare U Reg.
11-bit Preload Compare V Reg.
11-bit Preload Compare W Reg.
10-bit Preload Compare 0 Reg.
11-bit Compare W Reg.
11-bit Compare U Reg.
11-bit Compare V Reg.
10-bit Compare 0 Reg.
Tacho Prescaler Reg.
10-bit PWM Counter
12-Bit Prescaler
7.4.3 Functional Description
The IMC controller consists of the following func-
tion blocks:
– Input and Output pins
– Rotor speed measurement
– 3-Phase PWM signal generation
– 6-bit Dead Time generation
– Polarity selection
– Interrupt generation
The block diagram is shown in
CLR on CPT
16-Bit Tacho Capture Reg.
8-Bit Tacho Compare Reg.
CPU Int.
CPV Int.
CPW Int.
CM0 Int.
16-Bit Tacho Counter
CMS bit
CPC bit
Dead Time
Generator Reg.
Dead Time
Dead Time
Dead Time
Generator
Generator
Generator
OVF
Figure
OTC Int.
CPT Int.
63.
UL
VL
WL
UH
VH
WH