E910.36 Datasheet, PDF (1/1 Pages) ELMOS Semiconductor AG – Contact monitor (4 * GND & 4 * VBAT, parallel interface)

BUS IC
DC/DC CONVERTER
MOTOR DRIVER IC
RIPPLE COUNTER
ÿ Contact monitor (4 * GND & 4 * VBAT, parallel interface)
FEATURES
ÿ Supply voltage range VS 5.25 to 25V
ÿ Supply voltage range VDD 4.75 to 5.25V
ÿ Maximum overvoltage protection up to 40V
ÿ Low standby current (typical < 10µA)
ÿ Contact status monitoring by comparison of the
switch resistance with internal reference
ÿ High noise immunity
ÿ – 40°C to + 125 ºC operating temperature
ÿ SO20w package
APPLICATION
ÿ Automotive electronics
ÿ Monitor for mechanical switches
ÿ Monitor for interface levels
DESCRIPTION
The IC is developed for automotive applications. It continuously
monitors the status of two groups of switch contacts connected
to GND or VBAT.
The input currents are compared to internal references. The IC is
designed to operate with an external resistor of 1k Ý.
If the switch resistance is less than 1.5kÝ the IC will lead into an
active state (‘1’ for switches to VBAT and ‘0’ for switches to GND).
If the resistance will be more than 9kÝ than the IC will switch
to the corresponding inactive state. The input current as well as
the tristate driver are activated with the enable pin. Due to the
tristate outputs the IC can be used in bus configuration.
BLOCK DIAGRAM
VBAT
VS
IN7
IN6
IN5
IN4
IN3
IN2
IN1
IN0
72
VDD
CH 7
CH4
Ref.
EN
CH3
CH0
VS
EN
Ref.
OUT7
OUT6
OUT5
OUT4
EN
OUT3
OUT2
OUT1
OUT0
VDD
µC
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
ÿ Contact monitor 2 * 4, par. out
Non volatile contact monitor
Contact monitor 16 *, ser. out
PINNING
Pin Name
1
VS
2
IN0
3
IN1
4
IN2
5
IN3
6
IN4
7
IN5
8
IN6
9
IN7
10 EN
11
GND
12
OUT7
13
OUT6
14 OUT5
15
OUT4
16 OUT3
17
OUT2
18 OUT1
19 OUT0
20 VDD
Description
Supply voltage
Input for switch to GND
Input for switch to GND
Input for switch to GND
Input for switch to GND
Input for switch to VBAT
Input for switch to VBAT
Input for switch to VBAT
Input for switch to VBAT
Chip enable for input current and
tristate outputs, active low
Ground
TTL compatible tristate data port
TTL compatible tristate data port
TTL compatible tristate data port
TTL compatible tristate data port
TTL compatible tristate data port
TTL compatible tristate data port
TTL compatible tristate data port
TTL compatible tristate data port
Logic supply voltage
SENSOR IC
SENSOR INTERFACE IC
E910.36
PACKAGE
VS
1
IN0
2
IN1
3
IN2
4
IN3
5
IN4
6
IN5
7
IN6
8
IN7
9
EN
10
20
VDD
19
OUT0
18
OUT1
17
OUT2
16
OUT3
15
OUT4
14
OUT5
13
OUT6
12
OUT7
11
GND
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
73