Analog Integrated Circuit Device Data

Freescale Semiconductor

33

34921

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.

Figure 15. TYPICAL APPLICATION DIAGRAM

Supervisor

Circuitry

50

RST

Gate Driver

27

GATEOUT

22

VBOOST

23

CP2

26

CP1

B+

+

Charge Pump

Gate Voltage

Generator

39

5 V

38

5 V SUPPLY

37

5 V SWITCH

36

5 V SELECT

5.0 V

Dual Mode

Regulator

2

VCORE SELECT

13

VCORE

12

VCORE SUPPLY

Linear

Regulator

11

3.3 V

10

3.3 V SWITCH

+3.3 V

B+

3.3 V Switching

Regulator

42

AN0/ANALOGOUT_A

43

AN1/ANALOGOUT_B

44

AN2/ANALOGIN_A

45

AN3/ANALOGIN_B

A/D

Converter

and

Multiplexer

I/V

Converter

47

ENC_FILTA

46

ENC_FILTB

Analog

Encoder

GND

1, 16, 17, 24, 32,

33, 41, 48, 49, 64

Serial I/O

DGND

B+

7, 20, 21, 28, 29, 62

56

+

CE

SCLK

MOSI

MISO

51

52

53

54

CPWMA/CDCPWM

55

CPWMB

58

SB

/LSOUT2

6

S

B/LSOUT1

5

SA

/CDCMB

4

S

A/CDCMA

3

Active Clamp

Step

Motor Driver

B+

CDCMB/HSOUT2

61

CDCMA/HSOUT1

63

SS DC Motor Driver

18, 19

ADCMB

Motor Driver A

B+

14, 15

ADCMA

APWM

59

30, 31

BDCMB

Motor Driver B

B+

34, 35

BDCMA

BPWM

60

Thermal

Shutdown

Oscillator