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34921 Datasheet PDF

34921
Freescale Semiconductor

Part Number 34921
Description Configurable Motor Driver IC
Page 30 Pages
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Technical Data
Configurable Motor Driver IC
with Power Supplies
MC34921
Rev 5.0, 07/2005
34921
The 34921 power IC integrates multiple motor drivers, multiple
power regulators, and most other analog functions a small consumer
motion-enabled product needs. The 34921’s circuitry is fully protected
with current limiting, short-circuit shutdown, over-temperature, over-
voltage, and under-voltage detection. Supervisory functions can be
read and programmed through a 8-MHz Serial Interface.
A 5.0 V dual-mode (linear or switching) voltage regulator, 3.3 V
switching buck regulator, and a voltage-selectable (1.5 V, 1.8 V, 2.5 V)
linear regulator provide power management. Two H-Bridges and a
configurable motor driver are provided for controlling two dc motors
and one unipolar stepper motor.
The highly integrated 34921 brings together sensing,
communication, power management, system protection, and motor
control in one device.
Features
• Two Functionally Identical Pulse-Width Modulated (PWM) DC Motor
Drivers
• One Switching, One Linear, and One Dual-Mode Regulator
• Dual Mode Switching/Linear 5.0 V Regulator
• Supervisory Functions (Power-ON Reset and Error Reset Circuitry)
• 8-Channel, 8-Bit Analog-to-Digital Converter (ADC)
• Charge Pump for High-Side MOSFET Drive
• Complete Support for
• Analog Quadrature Encoder
• Pb-Free package is designated by suffix AE
H-BRIDGE MOTOR DRIVER
AND POWER SUPPLY
AE SUFFIX (Pb-Free)
98ARH98426A
64-LEAD LQFP-EP
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC34921AE/R2
0°C to 70°C
64 LQFP-EP
5.0 V / 3.3 V
B+
34921
Serial MISO
MCU MOSI
SCLK
Ports CE
A/D
AN0
B+
GATEOUT
5.0 V
3.3 V
VCORE
High-Side
MOSFET
ADCMA
AN3
Inputs
A
B+
APWM
B+ SA/CDCMA
B SB/LSOUT1 ADCMB
Step
Motor
C
B
A
CPWMA
CPWMB
SB/LSOUT2
SA/CDCMB
DGND
BDCMA
BPWM
BDCMB
GND
DC
Motor
A
DC
Motor
B
Figure 1. 34921 Simplified Application Diagram
*This document contains information on a product under development.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2005. All rights reserved.

















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