T911.45 ELMOS | Alldatasheet
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Technical content
BUS IC DC/DC CONVERTER MOTOR DRIVER IC RIPPLE COUNTER BLOCK DIAGRAM DRIVER IC I/O IC SENSOR IC SENSOR INTERFACE IC 53elmos product catalog june 2005 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. www.elmos.de | sales@ elmos .de PINNING PACKAGE ÿ Ripple detection IC system evaluation chip T911.45
FEATURES
ÿ Supply voltage VDD 4.75V to 5.25V ÿ High voltage input for motor voltage sensing ÿ Variable SC filter for high noise immunity controlled by motor voltage and current ÿ Hysteresis comparator with adaptive thresholds for min and max detection ÿ Adjustable filter gain to match motor ripple amplitude ÿ Logic level ripple output ÿ Low operating current (typ. 3mA ) ÿ Few components to adjust motor type ÿ – 40°C to + 125°C operating temperature ÿ SO14n package APPLICATION ÿ Seat-, mirror- and other positioning systems ÿ Pump-, fan- and other speed control systems
DESCRIPTION
The IC detects the commutation ripple of a DC motor in speed sensing or positioning systems. The ripple signal is available on an output pin to connect control- lers or dedicated logic. The IC can be adapted to different m otor characteristics by changing the RC-filter and the voltage divider . The resonant frequency of the variable band pass filter is auto - matically set close to the expected ripple frequency by measuring both, motor voltage and current. Thus for all disturbing frequen- cies generated by the power supply , the m otor drive circuit and the motor itself , good noise reduction is obtained. To optimize the filter characteristic s the gain can be programmed between 3 and 12. RIPOUT DGND SHUNT INNC OUTC VCRL AGND PROG2 VDD PROG1 CT RT BP O VMOT Pin Name Description
1 RIPOUT Ripple output
2 DGND Digital ground
3 SHUNT Current sense input
4 INNC Inverting input of current amplifier
5 OUTC Current amplifier output
6 VCRL Test output for VCO control voltage before filtering
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
ÿ Ripple detection Filter VCO µC VDD BPO VDD VBAT RPROT RLP1 RLP2 RSHUNT PROG 1 PROG 2 RIPOUT RT CT GND DGND VCRL OUTC CLP1INNC SHUNT VMOT CLP2 _ M AVAILABILITY Samples available Series tbd.