driven by - Elmos Semiconductor AG

driven by
E910.47
Non volatile contact monitor
Features
General Description
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The IC is designed for use in electric power window
systems to store and display the status of a childproof
lock function of the rear windows. The actual status
is stored in three bits of EEPROM whenever switch activity is detected. Redundancy of information is checked
periodically by a two out of three selection. In case one
bit differs from the others, the dominant information
is stored in all three EEPROM cells again. To ensure programming of the memory is successful under all supply conditions, the energy for EEPROM programming is
taken from the external capacitor at VDD.
Supply voltage range VS 6.9V to 19V
On chip voltage clamping
Internal voltage regulator (VDD)
Under voltage reset
Charge pump to generate programming voltage
Redundant non-volatile memory
Periodical check of data consistency
Automatic data correction in case of inconsistency
Two I/Os to detect switch activation and
drive LEDs
Operating temperature range – 40°C to + 85°C
SOIC 8N package
Applications
ÿ Status IC for switches
Switch detection and the start of EEPROM programming are disabled by an under voltage detection. A programming cycle once started will always be completed.
Two I/O pins are used for switch monitoring as well as
driving the status LEDs. An open drain low-side driver
output ( KISI ) is active when the rear window operation
is released. Short to ground, an open load or an overload condition at KISI is indicated by flashing the red
LED at 2Hz.
VBAT
VS
RED
GREEN
L0
int. Supply
VDD
L1
control
KISI
current
Limitation
Status E²
ELMOS Semiconductor AG
Info Sheet
E910.47
QM-No.: 25IS0025E.00 2009-08-27
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sales@elmos.de | 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.