ib technology
Micro RWD MF (Mifare) LP (low-power) specification
The MicroRWD MF (Mifare) LOW-POWER version is a complete read/write system for
13.56 MHz Mifare 1k, 4k and Ultralight cards. The module is pin-compatible and virtually
identical in operation and features to the “standard” version (NOTE differences in EEPROM
parameters and the three polling rates).
However the LOW-POWER version uses a different specification microcontroller offering
lower voltage operation and is designed to be powered from four alkaline battery cells.
During the Polling Delay period the microcontroller enters SLEEP mode with the RF device
in hard power-down mode to reduce the current consumption to a very low level.
The module wakes up after the polling delay period and the process repeats. The RWD-
MIFARE “low-power” Windows applications can be used to configure the parameters and
read/write data.
Parameter
Typical Value
Supply Voltage (performance optimised for 5 volt operation) 4 – 6 volts DC (operation
from 4 x alkaline cells)
Operating temperature
-40 deg C to + 85 deg C
AVERAGE current consumption. (1 second polling)
Active period for RF AND host communication (each
polling cycle).
Less than 150 µA
Up to 20 mS
Peak antenna voltage (optimum tuning)
30 volts peak-to-peak
Peak antenna current (optimum tuning) for short period each 150 mA
polling cycle (up to 10 mS burst)
Polling Delay (SLEEP / Power-down mode)
Current consumption during Polling delay / SLEEP
Current consumption during RF ON each polling cycle
Maximum data rate (between card and RWD)
Range (dependent on antenna dimensions and tuning)
Auxiliary output drives
4 mS to 8 seconds
Less than 20 µA
Less than 20mA
106k baud
25-50 mm
Up to 25mA
Serial Interface
Serial Communication Parameters
TTL level RS232
9600 baud, 8 data bits, no
parity, 1 stop bit protocol
with CTS handshake
Basic electrical specification with LEDs pins and auxiliary outputs NOT connected.
Note that the MicroRWD MF (Mifare) LOW-POWER version is designed for optimum
performance and range at 5-volt operation. Performance will be reduced at maximum and
minimum operating voltage.
During the “Polling Delay” SLEEP/Power-down period the logic levels on the RWD pins
remain active and so for minimum current consumption, the LEDs and the auxiliary output
drives must be disconnected (and the Beep output delay set to zero).
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