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1-6
SE955 Integration Guide
Electrical Interface
Table 1-3
lists the pin functions of the SE955 interface and illustrates typical input and output circuitry for the SE955-I100R,
SE955-E100R, SE955-I105R and SE955-E105R. The SE955-I100R/E100R accepts a 3.3 VDC +/- 10% power input, designated as V
The SE955-I105R/E105R accepts a 3.2 VDC to 5.5 VDC power input, designated as V
Pin
Mnemonic
No.
Type
V
2
PWR
BATT
GND
3
PWR
AIM/WAKE*
11
I
FLASH_DWLD*
1
I
RXD
4
I
CTS*
6
I
TRIG*
12
I
TXD
5
O
RTS*
7
O
PWRDWN
8
O
BPR*
9
O
DLED*
10
O
Notes: 1. SE955-I105R input lines diode isolated to prevent back biasing of the engine.
2. Signal names with the "*" modifier are asserted when at the ground level (logic 0, active low).
3. Signal names without the "*" modifier are asserted when at the positive supply voltage level (logic 1, active high).
Input Characteristics
SE955-I100R/E100R
Min
V
IL
V
V
*0.8
IH
BATT
SE955-I105R/E105R
V
IL
V
2.26 V
IH
Table 1-3. Electrical Interface
Power Supply:
SE955-I100R/E100R: 3.0 to 3.6 VDC
SE955-I105R/E105R: 3.2 to 5.5 VDC.
Ground
Wake Up: When the SE955 is in low power mode, pulsing this pin low for 200 nsec awakens the SE955.
AIM: This pin provides a hard wired trigger line that creates an AIM pattern (a spot). This spot allows positioning the
bar code and laser beam alignment to maximize the scan capability of the SE955. Aim mode is not supported on the
SE955-E100R.
Flash Down Load: Do not drive high. Pull low for download.
Received Data: Serial input port.
Clear to Send: Serial port handshaking line.
Trigger: Hardware triggering line. Driving this pin low causes the SE955 to start a scan and decode session.
Transmitted Data: Serial output port.
Request to Send: Serial port handshaking line.
Power Down Ready: When high, the decoder is in low power mode.
Beeper: Low current beeper output.
Decode LED: Low current decode LED output.
Table 1-4. Input/Output Characteristics
Max
V
*0.2
V
BATT
OL
V
OH
0.28 V
V
OL
V
OH
.
BATT
Description
Output Characteristics
SE955-I100R/E100R
Min
Max
0.4 V
V
- 0.5 V
BATT
V
- 1.0 V
BATT
SE955-I105R/E105R
0.1 V
0.18 V
V
- 0.1 V
BATT
2.98 V
4.49 V
.
BATT
Conditions
I
= 0.8mA
OL
I
= -0.2mA
OH
I
= -1.0mA
OH
I
= 0.1mA
OL
I
= 1.0mA
OL
I
= -0.1mA
OH
I
= -1.0mA
OH
V
- 3.2 V
BATT
I
= -1.0mA
OH
V
- 5.5 V
BATT
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