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Electrical Interface
Table 3-3 lists the pin functions of the SE-923 interface and illustrates typical input and
output circuitry.
Mnemonic
No.
NC
VBATT
GND
RXD
CTS*
AIM/WAKE*
11
TRIG*
12
Note: Signal names with the "*" modifier are asserted when at the ground level (active low).
Signal names without the "*" modifier are asserted when at the positive supply voltage
level (active high).
Table 3-3. Electrical Interface
Type
1
Not connected. Reserved for future versions of the SE-923.
Power Supply: This is the power supply voltage for the SE-923.
2
3
Ground: 0 V reference.
4
I
Received Data: Serial input port
6
I
Clear to Send: Serial port handshaking line
Wake Up: When the SE-923 is in the low power mode, pulsing
I
this pin low for 200 nsec awakens the SE-923.
Trigger: This pin is the hardware triggering line. Driving this pin
I
low causes the SE-923 to start a scan and decode session.
V
IL
V
IH
Name and Function
Min.
Max.
-0.3
1.0
3.85
V
+0.3
BATT
V
CC
10k
SCHOTTKY
SILICON
DIODE
SE-923-I000A Specifications
Condition
V
= 3.3
CC
V
= 5.5
CC
INPUT
3-7
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