Interface Connector Pin out

Copyright WJ Communications 2007. Subject to change without notice.

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Next Generation RFID Reader Module

Based on WJC200 Gen2 RFID reader chipset

Pin #

Name

Description

1, 2

+5.0 V

Power Supply. +5.0V @ 1.3 A

3,4

GND

Power Supply Ground Return

5

N/C

No Connect

6

WJM_EN

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.

7

TX

3.3V CMOS logic-level UART transmit pin

8

RX

5V tolerant CMOS logic-level UART receive pin

9

nRESET

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.

10

nBL/nPD

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.

11

STATUS_LED

3.3V logic-level 3-state output:

Logic high: OK

Tri-State: Sleep Mode

Logic low: Error

12

GPIO1

Currently FW configures these pins as outputs, they display various debug and status

signals to LEDs. If unused they can be left un-connected.

13

GPIO2

14

GPIO3

15

GPIO4

WJ Communications

www.wj.com

04/03/2007