Datalogic_Block_Diagram
Revision: 1.00
6/19/2003
page 2 of 6
DATALOGIC PROPRIETARY INFORMATIONS
STARGATE RF910MHz: FUNCTIONAL DESCRIPTION AND BLOCK DIAGRAMS
Functional blocks description with reference to page 3/4/5 block diagrams:
Main Processor
It’s a 16 bits embeeded Microprocessor (Mitsubishi 37733) with internal Flash and Ram memories. Static Ram:
128 kB. Flash memory: 128kB
It runs at 12 Mhz. This processor moves data between other blocks and controls block funtionality.
Radio Transceiver
Receives and transmit data packets at 36864 baud Manchester encoded.
Tx Power out (50 Ohm) + 0 dBm typ.
Tx FM deviation = 45 KHz typ.
State Indicators
One led using red, orange and green colors.
Antenna
StarGate has an external antenna not removable.
UART
Two external UART (16550) which drives respectively the Radio Transceiver and the 232/485 input-output
interface. It’s frequency work is 3.6864 MHz.
PIC
Programmable OTP microcontroller which converts uart NRZ (start+data+stop) bits into radio output
Manchester RZ data bits. It works at 3.6864 MHz.
Power Supply (Step Down)
No batteries.
Supplies 9-30 Vdc. It sources 70 mA.
An interface reset button is included.
Multiinterface
Transmit and received the data via RS232 and RS485 interface.
Clock sources description
12.00 MHz Quartz Crystal
Main Microprocessor Clock
(onto GEL-4734)
3.6864 MHz Ceramic Resonator
Microcont UART
(onto GEL-4734)
3.6864 MHz Ceramic Resonator
UART
(onto GEL-2372)
Radio transmitter/ receiver:
X1: 14.21875MHz
XTAL TX
X2: 14.05160MHz
XTAL RX
RF suppression devices:
On dc power input:
N.2 inductor 1uH
TDK NCL453232T-1R0K
N.2 ferrite bead
TDK ZBFS5101
