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Freescale Semiconductor Electronic Components Datasheet

MC33970 Datasheet

Dual Gauge Driver Integrated Circuit

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MC33970 pdf
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Advance Information
Document Number: MC33970
Rev. 3.0, 1/2007
Dual Gauge Driver Integrated
Circuit with Improved Damping
Algorithms
33970
This 33970 is a single-packaged, Serial Peripheral Interface (SPI)
controlled, dual step motor gauge driver integrated circuit (IC). This
monolithic IC consists of four dual output H-Bridge coil drivers and the
associated control logic. Each pair of H-Bridge drivers is used to
automatically control the speed, direction, and magnitude of current
through the two coils of a two-phase instrumentation step motor,
similar to an MMT-licensed AFIC 6405.
The 33970 is ideal for use in automotive instrumentation systems
requiring distributed and flexible step motor gauge driving. The
device also eases the transition to step motors from air core motors
by emulating the air core pointer movement with little additional
processor bandwidth utilization.
IMPROVED GAUGE DRIVER
INTEGRATED CIRCUIT
DW SUFFIX
EG SUFFIX (Pb-FREE)
98ASB42344B
24-PIN SOICW
Features
• MMT-Licensed Two-Phase Step Motor Compatible
• Minimal Processor Overhead Required
• Fully Integrated Pointer Movement and Position State Machine
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
with Air Core Movement Emulation
• 4096 Possible Steady State Pointer Positions
• 340° Maximum Pointer Sweep
• Fixed Maximum Acceleration and Deceleration of 4500°/s2
MC33970DW/R2
MCZ33970EG/R2
-40°C to 125°C
24 SOICW
• Maximum Pointer Velocity of 400°/s
• Analog Microstepping (12 Steps/Degree of Pointer Movement)
• Pointer Calibration and Return to Zero
• SPI-Controlled 16-Bit Word
• Calibratable Internal Clock
• Low Sleep Mode Current
• Backward Compatible with MC33991
• Improved Pointer Movement, Diagnostics, and Return to Zero (RTZ)
• Pb-Free Packaging Designated by Suffix Code EG
VPWR
5.0 V
VDD
Regulator
33970
VPWR
VDD
SIN0+
SIN0-
COS0+
COS0-
Motor 0
MCU
RTZ SIN1+
RST SIN1-
CS
SCLK
SI COS1+
SO
COS1-
GND
Motor 1
Figure 1. 33970 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2007. All rights reserved.



Freescale Semiconductor Electronic Components Datasheet

MC33970 Datasheet

Dual Gauge Driver Integrated Circuit

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MC33970 pdf
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
VDD
VPWR
CS
SCLK
SO
SI
SPI
INTERNAL
REGULATOR
COS0
SIN0
COS1
RST
LOGIC
UNDER-
AND
OVERVOLTAGE
DETECT
STATE
MACHINE
ILIM
H-BRIDGE
AND
CONTROL
OVERTEMPERATURE
DETECT
SIN1
OSCILLATOR
SIGMA-DELTA
ADC
AGND
MULTIPLEXER
COS0+
COS0-
SIN0+
SIN0-
COS1+
COS1-
SIN1+
SIN1-
VDD
RTZ
GND (8)
Figure 2. 33970 Simplified Internal Block Diagram
33970
2
Analog Integrated Circuit Device Data
Freescale Semiconductor



Freescale Semiconductor Electronic Components Datasheet

MC33970 Datasheet

Dual Gauge Driver Integrated Circuit

No Preview Available !

MC33970 pdf
PIN CONNECTIONS
PIN CONNECTIONS
COS0+
COS0-
SIN0+
SIN0-
GND
GND
GND
GND
CS
SCLK
SO
SI
1
2
3
4
5
6
7
8
9
10
11
12
24 COS1+
23 COS1-
22 SIN1+
21 SIN1-
20 GND
19 GND
18 GND
17 GND
16 VPWR
15 RST
14 VDD
13 RTZ
Figure 3. 33970 Pin Connections
Table 1. 33970 Pin Definitions
A functional description of each pin can be found in the Functional Pin Description section beginning on page 10.
Pin Number Pin Name Pin Function Formal Name
Definition
1
2
3
4
5 – 8,
17– 20
9
10
COS0+
COS0
SIN0+
SIN0
GND
CS
SCLK
Output
H-Bridge Outputs 0 Each pin is the output pin of a half bridge, designed to source or sink
current.
Ground
Input
Input
Ground
Chip Select
Serial Clock
These pins serve as the ground for the source of the low-side output
transistors as well as the logic portion of the device.
This pin is connected to a chip select output of a LSI IC.
This pin is connected to the SCLK pin of the master device and acts as a
bit clock for the SPI port.
11
SO
Output
Serial Output
This pin is connected to the SPI Serial Data Input pin of the master
device, or to the SI pin of the next device in a daisy chain.
12
SI
Input
Serial Input
This pin is connected to the SPI Serial Data Output pin of the master
device from which it receives output command data.
13
RTZ
Output
Multiplexed Output This is a multiplexed output pin, for the non-driven coil, during a Return to
Zero (RTZ) event.
14
VDD
Input
Voltage
This SPI and logic power supply input will work with 5.0 V supplies.
15
RST
Input
Reset
This input has an internal active pull-up.
16
VPWR
Input
Battery Voltage
Power supply.
21
SIN1
Output
H-Bridge Outputs 1 Each of these pins are the output pin of a half bridge, designed to source
22 SIN1+
or sink current.
23 COS1
24 COS1+
Analog Integrated Circuit Device Data
Freescale Semiconductor
33970
3




Part Number MC33970
Description Dual Gauge Driver Integrated Circuit
Maker Freescale Semiconductor
Total Page 30 Pages
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