Si9243A Vishay Intertechnology, Si9243A Datasheet - Page 4

• Manufacturer Part Number: Si9243A
• Manufacturer: Vishay Intertechnology

Si9243AEY
Vishay Siliconix
The Si9243AEY can be either in transmit or receive mode and
it contains over temperature, and short circuit V
detection circuits.
The voltage on the K and L pins are internally compared to
V
RX
is greater than V
In order to be in transmit mode, TX must be set “low.” The TX
signal is then internally inverted and turns the MOSFET on,
causing the K pin to be “low.” In transmit mode, the processor
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4
BAT/2
K
or RX
. If the voltage on the K or L pin is less than V
L
output will be “low.” If the voltage on the K or L pin
BAT/2
RX
V
RX
TX
DD
K
L
then RX
Narrow Body
SO Package
Top View
1
2
3
4
K
or RX
8
7
6
5
Pin Number
L
output will be “high.
L
V
K
GND
1
2
3
4
5
6
7
8
BAT
BAT/2
BAT
Symbol
GND
V
RX
RX
V
TX
BAT
fault
then
K
L
DD
K
L
K Receiver, Output
L Receiver, Output
Positive Power Supply
Transmit, Input
Ground Connection
K Transmit/Receive, Bidirectional
Battery Power Supply
L Transmit, Input
monitors the RX
there is no fault. In the event of over temperature, or short
circuit to V
protect the IC. The K pin will stay in high impedance and RX
will follow the K pin. The fault will be reset when TX is toggled
high. RX
V
any one of the TX, V
When the TX pin is set “high” the Si9243AEY is in receive
mode and the internal MOSFET is turned off. RX
outputs will follow L and K inputs respectively.
DD
while K and L pins have internal pull down resistors. When
Description
Part Number
Si9243AEY
K
, RX
BAT
, the Si9243AEY will turn off the K output to
L
K
and TX pins have internal pull up resistor to
and TX. When the two mirror each other
BAT
or GND pins is open the K output is off.
Temperature Range
–40 to 125_C
S-02936—Rev. D, 22-Jan-01
Document Number: 70788
L
and RX
K
K