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 52 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 | [email protected] elmos product catalog june 2005 53