E910.40 Datasheet, PDF (1/1 Pages) ELMOS Semiconductor AG – Sensorless position control of DC-motors

BUS IC
DC/DC CONVERTER
MOTOR DRIVER IC
RIPPLE COUNTER
ÿ Position control
Position control + driver
Speed control
Ripple detection
ÿ Sensorless position control of DC-motors
FEATURES
ÿ Supply voltage range VDD 9V to 16V
ÿ Full motor control and diagnosis
ÿ Driving a four N-channel-power-MOSFET full bridge
ÿ Pulse width modulation with 8bit resolution for
high side drivers
ÿ Drive frequency 23 kHz
ÿ Reduced current peaks during motor start
and acceleration
ÿ Active motor braking
ÿ Motor position determined by sensing motor
current fluctuations
ÿ Shortcircuit and overvoltage protected outputs
ÿ One pin microprocessor interface with
automatic baud rate recognition
ÿ Motor turned off automatically 200 ms after the
last valid transmission
ÿ Low standby current (typ. < 200 µA)
ÿ – 40°C to + 125°C operating temperature
ÿ SO20w package
APPLICATION
ÿ Seat adjustment
ÿ Steering column adjustment
ÿ Fuel pump
DESCRIPTION
The IC enables a µC to track the position of a DC-motor by count-
ing its current ripples. The ripple signal is available on an output
pin to connect controllers or dedicated logic. With the bidirec-
tional interface the actual position can be read out and IC param-
eters can be changed. Main parameters are motor direction and
PWM to control high side drivers. The IC can be adapted to differ-
ent motor characteristics by changing the RC-filter on ODIF, IDIF,
OLP and the voltage divider on BRTH.
VBAT
BLOCK DIAGRAM
VCC
RB
BIAS
VDD
VDD Reg
VGH 1
VGH 2
VSA
AVDD
BSI
slewrate
VREF
VREF
controlled
µC
TEMP
FET
RSR
Control
Driver
M
DATA
IMPOUT
VREF
Short
Circuit
Detect
Incr.
Detect
S/H
Filter & Amplifier
BRTH
ODIF
IDIF
VGL 1
VGL 2
SENSE 1
SENSE 2
OLP
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DRIVER IC
I/O IC
SENSOR IC
SENSOR INTERFACE IC
PINNING
Pin Name
1 GND
2 VGH1
3 VGH2
4 VGL1
5 VGL2
6 VDD
7 BSI
8 SENSE1
9 SENSE2
10 RSR
11 OLP
12 IDIF
13 ODIF
14 VSA
15 RB
16 VREF
17 BRTH
18 TEMP
19 IMP OUT
20 DATA I/O
Description
Ground
Gate voltage for high side driver 1
Gate voltage for high side driver 2
Gate voltage for low side driver 1
Gate voltage for low side driver 2
Input supply voltage
Input bootstrap voltage
Voltage sense bridge 1
Voltage sense bridge 2
External resistor to adjust slew rate
Output low pass filter
Inverting input differential amplifier
Output differential amplifier
Internal 9V analog supply
External bias resistor
Internal 5V supply voltage
Input breake threshold
Input temperature monitor
Incremental output for counting pulses, open drain
Serial data I/O
E910.40
PACKAGE
GND
1
VGH1
2
VGH2
3
VGL1
4
VGL2
5
VDD
6
BSI
7
SENSE1
8
SENSE2
9
RSR
10
20
DATA I/O
19
IMP OUT
18
TEMP
17
BRTH
16
VREF
15
RB
14
VSA
13
ODIF
12
IDIF
11
OLP
Note ELMOS Semiconductor AG (below ELMOS) reserves the right to make changes to the product contained in this publication without notice. ELMOS assumes no responsibility for the use of any
circuits described herein, conveys no licence under any patent or other right, and makes no representation that the circuits are free of patent infringement. While the information in this publication
has been checked, no responsibility, however, is assumed for inaccuracies. ELMOS does not recommend the use of any of its products in life support applications where the failure or malfunction of
the product can reasonably be expected to cause failure of a life-support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications.
Copyright © 2005 ELMOS Reproduction, in part or whole, without the prior written consent of ELMOS, is prohibited.
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elmos product catalog june 2005
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