E910.47 Datasheet, PDF (1/1 Pages) ELMOS Semiconductor AG – Non volatile contact monitor

BUS IC
DC/DC CONVERTER
MOTOR DRIVER IC
RIPPLE COUNTER
ÿ Non volatile contact monitor
FEATURES
ÿ Supply voltage range VS 6.9V to 19V
ÿ On chip voltage clamping
ÿ Under voltage reset
ÿ Charge pump to generate programming voltage
ÿ Redundant non - volatile memory
ÿ Periodical check of data consistency
ÿ Automatic data correction in case of inconsistency
ÿ Two I/Os to detect switch activation and
drive LEDs
ÿ – 40°C to + 85°C operating temperature
ÿ SO8n package
APPLICATION
ÿ Status IC for switches
DESCRIPTION
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 the
EEPROM whenever switch activity is detected. The redundant in-
formation is checked periodically by a two out of three selection
and in case of one bit distinguishes from the others, the dominant
information is stored in all three EEPROM cells again.
To make sure that programming the memory is successful under
all supply voltage conditions, the energy is taken from an external
capacitor once the programming cycle has started. The capacitor
is charged by an internal voltage regulator. Switch detection and
the start of the programming cycle are disabled by an undervolt-
age detection, while a programming cycle once started will al-
ways be completed.
Two I/O Pins are used for detecting switch activation as well as
driving the LEDs to display the status. An open drain low-side
driver output “KISI” is active when the rear window operation is
released.
Detection of a short to ground, an open load or an overload condi-
tion on KISI will be indicated by flashing the red LED with 2Hz.
BLOCK DIAGRAM
VBAT
RED
GREEN
L0
L1
74
VS
int. Supply
VDD
control
Status E²
KISI
current
Limitation
DRIVER IC
I/O IC
Analog multiplexer 8:1
Contact monitor 8 * to GND, par. out
Contact monitor 8 * to VBAT, par. out
Contact monitor 2 * 4, adj., par. out
Contact monitor 2 * 4, par. out
ÿ Non volatile contact monitor
Contact monitor 16 *, ser. out
PINNING
Pin Name
1
KISI
2
L1
3
VS
4
TEST1
5
VDD
6
TEST2
7
L0
8
GND
Description
Output for status; low side driver
Input and LED driver
Supply voltage
For test only; connect to GND
VDD output
For test only; connect to GND
Input and LED driver
GND
SENSOR IC
SENSOR INTERFACE IC
E910.47
PACKAGE
KISI
1
L1
2
VS
3
TEST1
4
8
GND
7
L0
6
TEST2
5
VDD
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
75