MC34921 Datasheet, PDF (33/36 Pages) List of Unclassifed Manufacturers – Configurable Motor Driver IC with Power Supplies

TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
In typical applications such as a personal computer printer, the MC34921 would supply the motor drive and control for two bi-
directional dc motors, two unidirectional dc motors, and one unipolar stepper motor. In addition, the MC34921 would supply the
power management for the printer including: the system MCU core voltage, the 3.3V logic supply, and the 5V logic supply. The
MC34921 also would supply the system with the means to read and pre-process the carriage position information from an analog
optical encoder.
B+
B+
7, 20, 21, 28, 29, 62
CP1
0.1 µF
10 µF
+
CP2 VBOOST
DGND
26
23
22
56
560 µF
5 V SELECT 36
5 V SWITCH 37
5 V SUPPLY 38
5 V 39
+3.3 V
100 µH
3.3 V SWITCH 10
5.0 V
Dual Mode
Regulator
B+
Charge Pump
Gate Voltage
Generator
Thermal
Shutdown
B+
3.3 V 11
+
330 µF
10 µF
VCORE SUPPLY ₁₂
VCORE ₁₃
VCORE SELECT ₂
ENC_FILTB 46
ENC_FILTA 47
3.3 V Switching
Regulator
V_CORE
Linear
Regulator
I/V
Converter
Oscillator
Motor Driver B
B+
60 BPWM
BDCMA
34, 35
BDCMB
30, 31
59 APWM
ADCMA
14, 15
Analog
Encoder
AN3/ANALOGIN_B 45
AN2/ANALOGIN_A 44
AN1/ANALOGOUT_B 43
AN0/ANALOGOUT_A 42
51
MISO
52
MOSI
53
SCLK
54
CE
GATEOUT 27
A /D
Converter
and
Multiplexer
Motor Driver A
Serial I/O
Gate Driver
Active Clamp
Step
Motor Driver
SS DC Motor Driver
B+
ADCMB
18, 19
3 SA/CDCMA
4 SA/CDCMB
5 SB/LSOUT1
6 SB/LSOUT2
55 CPWMA/CDCPWM
58 CPWMB
RST 50
Supervisor
Circuitry
63 CDCMA/HSOUT1
61 CDCMB/HSOUT2
GND
1, 16, 17, 24, 32,
33, 41, 48, 49, 64
Figure 14. TYPICAL APPLICATION DIAGRAM
Analog Integrated Circuit Device Data
Freescale Semiconductor
34921
33