User's Manual

RU00-M04 RFID Spitfire Module Specifications
PAGE: 13
11- RU00-M04-X001-01
DATE: 10-25-2016
7 Interfacing to the RU00-M04
 Power and Ground
All circuits on the RU00-M04 are powered from inputs at pin 1, 2, 3. The RU00-M04 operates with any
supply voltage between 3.3 and 5.25V. Because the individual supplies within the part are regulated on the
RU00-M04, a large amount of supply filtering is not required. A high value, low ESR tantalum capacitor
(150uF or greater) is recommended and should be accompanied by a 0.1uF ceramic chip capacitor close to
the pin.
All 4 available ground pins (pin4, 8, 11, 14) of the RU00-M04 must be connected to the user PCB via 20 pin
FPC cable.
 Communication
The RU00-M04 has one UART ports, which utilizes 3.3V CMOS I/O over a pair of pins. The UART is
compatible with a standard RS-232C serial port through an appropriate level translator IC. The user’s host
processor issues LLCS commands to the HOST UART (RX pin 10, TX pin 9), which can be configured for
any standard UART data rate for 115.2k, 230.4k, 460.8k and 921.6 kbaud. The default rate is set to 115.2
kbaud. Please see the RU00-M04 data sheet for detailed I/O specifications.
 RF
The RU00-M04 is configured for monostatic operation, which requires only a single RF I/O pin for full
duplex communication. There are four antenna port, they are required to be connected with 50ohm RF cable.

 GPIO
There are four user-configurable digital GPIOs on the RU00-M04. The signals are number GPIO1 – GPIO4
and occupy pins 15 – 18 respectively. Each GPIO operates at standard 3.3V CMOS logic levels with a
minimum output current capability of 4 mA per pin while maintaining guaranteed noise margins. Appropriate
interface circuitry and layout as well as handling of the OEM hardware should be applied. Please see the
RU00-M04 data sheet for detailed I/O specifications.