E910.35 Datasheet, PDF (1/1 Pages) ELMOS Semiconductor AG – Contact monitor (4 * GND & 4 * VBAT, adjustable, parallel interface)

BUS IC
DC/DC CONVERTER
MOTOR DRIVER IC
RIPPLE COUNTER
ÿ Contact monitor (4 * GND & 4 * VBAT, adjustable, parallel interface)
FEATURES
ÿ Programmable input current of 1mA / 10mA
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 comparing the
switch resistance with the internal reference
ÿ High noise immunity
ÿ – 40°C to + 125 ºC operating temperature
ÿ SO24w 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 1kÝ.
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
70
VS
VDD
VDD
Ref.
EN
4
D0
IN0
D1
4
D2
IN1
D3
IN2
D4
D5
IN3
D6
8
8
D7
µC
VS
4
IN4
control
LOAD
4
CLEAR
IN5
Ref.
EN
EN
EN
IN6
IN7
DRIVER IC
I/O IC
Analog multiplexer 8:1
Contact monitor 8 * to GND, par. out
Contact monitor 8 * to VBAT, par. out
ÿ 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 EN
11 LOAD
12 CLEAR
13 NC
14 NC
15 GND
16 OUT7
17 OUT6
18 OUT5
19 OUT4
20 OUT3
21 OUT2
22 OUT1
23 OUT0
24 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
Set current value register
Reset current value register
Not connected
Not connected
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
E910.35
PACKAGE
VS
1
IN0
2
IN1
3
IN2
4
IN3
5
IN4
6
IN5
7
IN6
8
IN7
9
EN
10
LOAD
11
CLEAR
12
24
VDD
23
OUT0
22
OUT1
21
OUT2
20
OUT3
19
OUT4
18
OUT5
17
OUT6
16
OUT7
15
GND
14
NC
13
NC
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
71