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12-pin FPC Connector
The following table lists the pin functions of the 12-pin FPC connector.
Table 4-1
PIN#
Signal
1
PIN1
2
VIN
3
GND
4
RXD
5
TXD
6
USB_D-
7
USB_D+
8
OUT_LIGHT_EN
9
BUZ
10
LED
11
nRESET
12
nTRIG
※ I = Input; O = Output
※ 1 The OUT_LIGHT_EN signal (PIN 8) can be used to turn on external illumination LED when configured as an output.
To program the external illumination On or Off, please see the EM50S user guide.
For the external illumination LED circuit design, please see the "External Illumination LED Circuit" section in this chapter. If
the OUT_LIGHT_EN pin is not used, leave it unconnected.
※ 2 This output signal can be used by an external beeper circuit to generate audible feedback to the user to indicate
power-on and good read statuses.
Power On beep: The BUZ pin (PIN 9) produces a PWM output (duration: 400ms; frequency: 4184Hz, both parameters are
NOT user-programmable) 970ms after power-on. The beep can be programmed On or Off. To learn how to program the
parameter, please see the EM50S user guide.
Good Read beep: The BUZ pin (PIN 9) produces a PWM output (default duration: 80ms; default frequency: 2730Hz, both
parameters are user-programmable) when a good read occurs. The beep can be programmed On or Off. To learn how to
program these parameters, please see the EM50S user guide.
For the external beeper circuit design, please see the "Beeper Circuit" section in this chapter. If the BUZ pin is not used,
leave it unconnected.
I/O
-
No connection
-
3.3V power supply input
-
Power-supply ground
I
TTL level 232 receive data
O
TTL level 232 transmit data
I/O
USB D- differential data signal
I/O
USB D+ differential data signal
External illumination control
-
Default: disable (external illumination Off), input with ≥20K ohm pull up
O
Beeper output
O
Good Read LED output
I
Reset signal input: active low
I
Trigger signal input: active low
Function
Remark
See Note 1
See Note 2
See Note 3
See Note 4
See Note 5
22
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