Freescale Semiconductor
Technical Data
MC34921
Rev 5.0, 07/2005
Configurable Motor Driver IC
with Power Supplies
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
5.0 V / 3.3 V
Serial
MCU
Ports
A/D
34921
H-BRIDGE MOTOR DRIVER
AND POWER SUPPLY
AE SUFFIX (Pb-Free)
98ARH98426A
64-LEAD LQFP-EP
ORDERING INFORMATION
Device
MC34921AE/R2
Temperature
Range (T
A
)
0°C to 70°C
Package
64 LQFP-EP
34921
MISO
MOSI
SCLK
CE
AN0
B+
B+
High-Side
MOSFET
GATEOUT
5.0 V
3.3 V
VCORE
ADCMA
Inputs
A
B+
B
Step
Motor
C
A
B+
AN3
SA/CDCMA
SB/LSOUT1
CPWMA
CPWMB
APWM
ADCMB
BDCMA
BPWM
BDCMB
GND
DC
Motor
B
DC
Motor
A
B
SB/LSOUT2
SA/CDCMB
DGND
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.
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
