ELMOS T911.45

BUS IC
DC/DC CONVERTER
MOTOR DRIVER IC
RIPPLE COUNTER
DRIVER IC
I/O IC
SENSOR IC
SENSOR INTERFACE IC
Position control
Position control + driver
Speed control
ÿ Ripple detection
ÿ Ripple detection IC
FEATURES
DESCRIPTION
PINNING
ÿ
Supply voltage VDD 4.75V to 5.25V
The IC detects the commutation ripple of a DC motor in speed
ÿ
High voltage input for motor voltage sensing
sensing or positioning systems.
ÿ
Variable SC filter for high noise immunity
ÿ
ÿ
controlled by motor voltage and current
The ripple signal is available on an output pin to connect control-
Hysteresis comparator with adaptive thresholds
lers or dedicated logic. The IC can be adapted to different motor
for min and max detection
characteristics by changing the RC-filter and the voltage divider.
Adjustable filter gain to match motor ripple
The resonant frequency of the variable band pass filter is auto-
amplitude
matically set close to the expected ripple frequency by measuring
ÿ
Logic level ripple output
both, motor voltage and current. Thus for all disturbing frequen-
ÿ
Low operating current (typ. 3mA )
cies generated by the power supply, the motor drive circuit and
ÿ
Few components to adjust motor type
the motor itself, good noise reduction is obtained. To optimize
ÿ
– 40°C to + 125°C operating temperature
the filter characteristics the gain can be programmed between
ÿ
SO14n package
3 and 12.
APPLICATION
ÿ
Seat-, mirror- and other positioning systems
ÿ
Pump-, fan- and other speed control systems
BLOCK DIAGRAM
T911.45
system evaluation chip
PACKAGE
Pin
Name
Description
1
RIPOUT
Ripple output
RIPOUT
1
14
PROG2
2
DGND
Digital ground
DGND
2
13
VDD
3
SHUNT
Current sense input
SHUNT
3
12
PROG1
4
INNC
Inverting input of current amplifier
INNC
4
11
CT
OUTC
5
10
RT
5
OUTC
Current amplifier output
VCRL
6
9
BPO
6
VCRL
Test output for VCO control voltage before filtering
AGND
7
8
VMOT
7
AGND
Analog ground
8
VMOT
Motor voltage input
9
BPO
Test output for SC bandpass filter output signal
10
RT
VCO pin for external timing resistor
11
CT
VCO pin for external timing capacitor
12
PROG1
Programming input 1 for gain adjust of bandpass filter
13
VDD
5V supply
14
PROG2
Programming input 2 for gain adjust of bandpass filter
AVAILABILITY
Samples
Series
available
tbd.
VBAT
VDD
BPO
VDD
VMOT
RPROT
PROG 1
+
PROG 2
M
_
Filter
µC
&
VCO
SHUNT
+
INNC
_
RIPOUT
RT
CT
GND
DGND
VCRL
RLP1
CLP1
RLP2
CLP2
RSHUNT
OUTC
R1
R2
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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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