Freescale Semiconductor
Technical Data
Document Number: MC33977
Rev. 2.0, 1/2007
Single Gauge Driver
The 33977 is a Serial Peripheral Interface (SPI) Controlled, stepper
motor gauge driver Integrated Circuit (IC). This monolithic IC consists
of a dual H-Bridge coil driver and its associated control logic. The H-
Bridge drivers are used to automatically control the speed, direction,
and magnitude of current through the coils of a two-phase
instrumentation stepper motor, similar to an MMT-licensed AFIC 6405
of Switec MS-X156.xxx motor.
The 33977 is ideal for use in instrumentation systems requiring
distributed and flexible stepper motor gauge driving. The device also
eases the transition to stepper motors from air core motors by
emulating the damped air core pointer movement.
Features
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MMT-Licensed Two-Phase Stepper Motor Compatible
Switec MS-X15.xxx Stepper Motor Compatible
Minimal Processor Overhead Required
Fully Integrated Pointer Movement and Position State Machine
with Air Core Movement Emulation
4096 Possible Steady State Pointer Positions
340° Maximum Pointer Sweep
Maximum Acceleration of 4500°/s
2
Maximum Pointer Velocity of 400°/s
Analog Microstepping (12 Steps/Degrees of Pointer Movement)
Pointer Calibration and Return to Zero (RTZ)
Controlled via 16-Bit SPI Messages
Internal Clock Capable of Calibration
Low Sleep Mode Current
Pb-Free Packaging Designated by suffix code EG
33977
SINGLE GAUGE DRIVER
DW SUFFIX
EG SUFFIX (Pb-FREE)
98ASB42344B
24-PIN SOICW
ORDERING INFORMATION
Device
MC33977DW/R2
- 40°C to 125°C
MCZ33977EG/R2
24 SOICW
Temperature
Range (T
A
)
Package
V PWR
33977
5.0 V
Regulator
V DD
VPWR
VDD
SIN+
SIN-
Motor
RTZ
RST
CS
SCLK
SI
SO
COS+
COS-
MCU
GND
Figure 1. 33977 Simplified Application Diagram
Freescale Semiconductor, Inc. reserves the right to change the detail specifications,
as may be required, to permit improvements in the design of its products.
© Freescale Semiconductor, Inc., 2007. All rights reserved.
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
