EMPROT Datasheet, PDF (1/17 Pages) rfsolutions.ltd – Micro RWD EM4102 Low Power Version

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)
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.
+5v
Micro RWD EM4102 LP module connections
1k _{Red LED}
1
24
CTS
“BEEP” output ^{Green LED}
Current limiting
OP3
resistor
OP2
0v GND
700 µΗ Antenna
22R nom
2
23
3
22
4
21
5 _Micro 20
6 _RWD 19
7 _{EM LP} 18
8
17
9
16
10
15
11
14
Tx ^TTL
RS232 I/F
Rx
+5v DC supply
OP0
Auxiliary (automatic) data outputs:
OP1
9600 baud serial - OP0
OR
24/32-bit Weigand protocol
DATA HIGH – OP0
DATA LOW – OP1
Screen
(if applicable)
12
13
0v GND
Aux out (serial) data can be
redirected from OP0 to Tx, pin 23
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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