WJM3000
G
Next Generation RFID Reader Module
Based on WJC200 Gen2 RFID reader chipset
Interface Connector Pin out
1, 2
3,4
5
6
7
8
9
+5.0 V
GND
N/C
WJM_EN
TX
RX
nRESET
Pin #
Name
Description
Power Supply. +5.0V @ 1.3 A
Power Supply Ground Return
No Connect
Active High Power Enable. Grounding this pin shuts off entire module. Minimum logic
high voltage is +2.5V. 5V tolerant. Low impedance driver or a pull up resistor less than
2K required.
3.3V CMOS logic-level UART transmit pin
5V tolerant CMOS logic-level UART receive pin
5V tolerant Active Low Reset Pin. 10K internal pull up, interface with open collector
driver. When held low, WJM draws current but will not respond to commands. If nBL/
nPD is held low as nRESET is brought high, the WJM enters Bootloader mode. If nBL/
nPD is held high as nRESET is brought high, the WJM application starts. This pin can
be left unconnected for minimal hardware configuration. A reset controller may be re-
quired if power supply rise time is slow.
5V tolerant Active Low Bootloader/PowerDown pin. 10K internal pull up, interface with
open collector driver. This pin serves two functions.
1) If this pin is low at the rising edge of nRESET (including power-on), the Boot-
loader is activated for writing a new Firmware application (FW). If it is high, FW
starts.
2) Once FW starts, bringing this pin low enables sleep mode. The module will not
respond to API commands in sleep mode. Keep it high for normal operation.
This pin can be left unconnected for minimal hardware configuration.
3.3V logic-level 3-state output:
Logic high: OK
Tri-State: Sleep Mode
Logic low: Error
Currently FW configures these pins as outputs, they display various debug and status
signals to LEDs. If unused they can be left un-connected.
10
nBL/nPD
11
STATUS_LED
12
13
14
15
GPIO1
GPIO2
GPIO3
GPIO4
WJ Communications
www.wj.com
04/03/2007
Copyright WJ Communications 2007. Subject to change without notice.
All trademarks, trade names, service marks, and logos remain the property of the rightful owners
WJCI [ WJ COMMUNICATION. INC. ]
