RoyalTek REB-4315 - Manual (Page 12)

RoyalTek Confidential
11
REB-4315 Operational Manual
RX(CMOS I/O run from 1.8v)
UART data receive (RX)
TX (CMOS I/O run from 1.8v)
UART data transmit (TX)
RF_IN
This pin receives GPS analog signal. The line on the PCB between the antenna(or
antenna connector) has to be a controlled impedance line (Microstrip at 50Ω).
ON_OFF (CMOS I/O run from 1.8v)
Input pulse is required to start the system, and switch the operation mode to full-power
mode or Hibernate mode.
Wakeup(CMOS I/O run from 1.8v)
Wakeup output indicate the chip states, when chip is working the output is high level.
Wakeup output can control or enable the external regulator.(Ex. To control
external antenna power)
PPS(CMOS I/O run from 1.8v)
This pin provides one pulse-per-second output from the board, which is synchronized to
GPS time.