E910.34 Datasheet, PDF (1/1 Pages) ELMOS Semiconductor AG – Contact monitor (8 channel to VBAT, parallel interface)

BUS IC
DC/DC CONVERTER
MOTOR DRIVER IC
RIPPLE COUNTER
ÿ Contact monitor (8 channel to VBAT, parallel interface)
FEATURES
ÿ Supply voltage range VDD 4.25V to 5.25V
ÿ Monitor supply voltage range VS 5.25V to 25V
ÿ Maximum overvoltage protection up to 40V
ÿ Internal clamp diodes at each input to VS and GND
ÿ Low standby current (typical < 10µA)
ÿ Contact status monitoring by comparison of the
resistance at the inputs with an internal reference
ÿ High noise immunity
ÿ – 40°C to + 125°C operating temperature
ÿ SO20w package
APPLICATION
ÿ Automotive electronics
ÿ Monitor for mechanical switches
ÿ Monitor for voltage levels
DESCRIPTION
The IC monitors the status of all switch contact connected to VS
continuously .
The input currents are compared with the current of an internal
reference resistor. The IC is designed to operate with an external
series resistor RIN0 to RIN7 of 1kÝ. The current, driven through the
contacts keeps their resistance low.
The output switches to high when the input resistance increases
to above 9kÝ and switches to low when the input resistance falls
below 1.5kÝ. These values are valid within the supply range 5.25V
to 25V.
A closed switch corresponds to a low logic level on the outputs
OUT0-7.
BLOCK DIAGRAM
VBAT
VS
VDD
IN 0
IN 1
IN 2
IN 3
IN 4
IN 5
IN 6
IN 7
68
CH 7
CH 0
Ref.
VDD
EN
OUT 0
OUT 1
µC
OUT 2
OUT 3
OUT 4
OUT 5
OUT 6
OUT 7
DRIVER IC
I/O IC
Analog multiplexer 8:1
Contact monitor 8 * to GND, par. out
ÿ Contact monitor 8 * to VBAT, par. out
Contact monitor 2 * 4, adj., par. out
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 ENB
11 GND
12 OUT7
13 OUT6
14 OUT5
15 OUT4
16 OUT3
17 OUT2
18 OUT1
19 OUT0
20 VDD
Description
Monitor supply voltage
Input for switch / voltage sensing
Input for switch / voltage sensing
Input for switch / voltage sensing
Input for switch / voltage sensing
Input for switch / voltage sensing
Input for switch / voltage sensing
Input for switch / voltage sensing
Input for switch / voltage sensing
Chip - enable active low
Ground
TTL compatible bidirectional data port
TTL compatible bidirectional data port
TTL compatible bidirectional data port
TTL compatible bidirectional data port
TTL compatible bidirectional data port
TTL compatible bidirectional data port
TTL compatible bidirectional data port
TTL compatible bidirectional data port
Logic supply voltage
SENSOR IC
SENSOR INTERFACE IC
E910.34
PACKAGE
VS
1
IN0
2
IN1
3
IN2
4
IN3
5
IN4
6
IN5
7
IN6
8
IN7
9
ENB
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
69