ib technology
Data Sheet
EMPROT_LP.PDF
17 Pages
Last Revised 01/03/09
Micro RWD EM4102 Low Power Version
(with auxiliary data outputs)
The MicroRWD EM4102 (Low Power) version is a complete reader and tag acceptance
solution for 125kHz EM Marin EM4102 (and Microchip MCRF200/123) derived RF
transponders. The solution is entirely housed within a 24-pin DIL package and only needs a
700µH antenna connected and a 5v DC supply to be a fully featured RFID Reader system.
The MicroRWD EM4102 LP version behaves in the same manner as the standard reader
except that it has an
active, average current consumption of around 100µA (micro Amps)
µ
with 1 second polling rate. As with other RWD modules, all commands and data response are
via a simple TTL level RS232 interface. The RWD module also has output pins for indicator
LEDs, high-current outputs for driving external loads and a programmable “BEEP” output for
external sounders. In addition, the RWD EM4012 LP version has
auxiliary data outputs on
the OP0 / OP1 pins
that can be programmed to automatically output the UID (serial number)
as
asynchronous 9600 baud
serial or
Weigand protocol Data High / Data Low signals.
All
these features can be configured and turned ON/OFF by setting RWD EEPROM parameters.
The diagram below shows the pin out configuration for the RWD EM4102 LP module.
Micro RWD EM4102 LP module connections
1k
Red LED
1
2
24
23
22
21
20
+5v
CTS
Tx
TTL
Rx
+5v DC supply
OP0
OP1
9600 baud serial - OP0
OR
24/32-bit Weigand protocol
DATA HIGH – OP0
DATA LOW – OP1
Aux out (serial) data can be
redirected from OP0 to Tx, pin 23
0v GND
Auxiliary (automatic) data outputs:
RS232 I/F
“BEEP” output
Current limiting
resistor
Green LED
3
4
OP3
OP2
5
Micro
6
RWD
19
7
EM LP
18
8
9
17
16
15
14
13
0v GND
700
µΗ
Antenna
22R nom
10
11
12
Screen
(if applicable)
With the ultra-low-power current consumption and the additional auxiliary data output
features, this one of the most compact and flexible reader systems available.
The EM4102 based transponders provide 64 bits of read-only memory. This memory contains
a header bit sequence and parity bits that are decoded to give 40-bits (5 bytes) of user data.
This 5-byte Unique Identifier (UID) or serial number can be read using the READ TAG
(ASCII “R”, 0x52 Hex) command.
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