driven by E100.15 Contact monitor (8 channel to GND, parallel interface) Features General Description ˘ ˘ ˘ ˘ ˘ ˘ The IC continuously monitors the status of all switch contacts connected between INn and ground. ˘ ˘ Supply voltage range VS 5.25V to 25V Logic supply voltage range VCC 4.75V to 5.25V Internal clamp diodes at each input to VS and GND Low standby current ( ENB=1 ) IVS < 20µA Contact status monitoring by comparing the input resistance to an internal reference High noise immunity Operating temperature range – 40°C to + 125°C SOIC20 package Applications ˘ ˘ The input currents are compared to the current through an internal reference resistor. The current driven through the contacts keeps their resistance low. The output switches to high when the input resistance increases to above 10kÝ and switches to low when the input resistance falls below 2.5kÝ. A series resistance of 1kΩ is assumed to be connected between INn and the switch for current limitation. A closed switch results in a low logic level on the corresponding output of OUT0-7. Monitor for mechanical switches Monitor for voltage levels VBAT VS VCC VCC CH7 CH0 ENB IN0 IN1 IN2 OUT0 Ref. OUT1 OUT2 IN3 External µC OUT3 IN4 OUT4 IN5 OUT5 IN6 OUT6 IN7 OUT7 E100.15 ELMOS Semiconductor AG Info Sheet QM-No.: 25IS0034E.00 2009-09-09 ELMOS Semiconductor AG – Headquarters Heinrich-Hertz-Str. 1 | 44227 Dortmund | Germany Phone + 49 (0) 231 - 75 49 - 100 | Fax + 49 (0) 231 - 75 49 - 149 email@example.com | www.elmos.de 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 © 2009 ELMOS Reproduction, in part or whole, without the prior written consent of ELMOS, is prohibited.