M10478 Datasheet, PDF (10/30 Pages) List of Unclassifed Manufacturers – GPS RADIONOVA® RF Antenna Module

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m2m
Host Interface Overview
GPS RADIONOVA^® RF Antenna Module
Part No. M10478
UART Interface
The default UART communication setting for the M10478 is NMEA-0183 protocol at 4800 Baud, 8 data bits, 1
stop bit, no flow control.
• TX: Output from the GSD4e
• RX: Input to the GSD4e
• RTS (optional): hardware flow control, high when ready to transmit
• CTS (optional): hardware flow control input, high when host allows transmission
While RX and CTS inputs are 3.3V compatible, if RX is driven from a source higher than 1.8V, current may
flow from the driver in reverse through the GSD4e’s ~80kΩ internal pull-up resistor. TX has maximum 1.8 V
logic high output level and may require an external level shifter to interface with a 3.3V input on a host.
UART Interface Logic Levels
Symbol
V_IL
V_IH
V_OL
V_OH
Description
Low Level Input Voltage
High Level Input Voltage
Low Level Output Voltage
High Level Output Voltage
Min
-0.4
0.7 x V_CC
-
0.75 x V_CC
Max
0.45
3.6
0.4
-
Unit
V
V
V
V
Configuration 1:
• RX and TX data lines only, no hardware or software flow control
Configuration 2:
• RX and TX lines for data transmissions
• RTS and CTS for hardware flow control under standard hardware flow control principles
• Transmission stops at the end of the current character and restarts when CTS goes high.
GSD4e may lose or garble serial messages if host flow control throttling is too severe. GSD4e design expects
unrestricted outflow of serial messages.
The UART interface can be run at baud rates from 1200 to 1.8432 MBaud. The default protocol is determined
by hardware configuration (see Hardware Baud Rate Selection Table above).
Antennas for Wireless M2M Applications
10
Product Specification 12MD-0050-2-PS