Hemisphere GPS SBX-4, Руководство интегратора, Страница: 14 / 37

SBX-4 Integrator Guide Chapter 2-Integrating the SBX-4 Page 10 of 22
Note: In order to maintain backwards hardware compatibility with the SBX-3, it is possible to
power the SBX-4 with 5 V. The serial data output level will track the input voltage when greater
than 3.3 V is supplied. The serial data inputs will be tolerant to voltages up to the level of the
supplied input voltage.
Signal Lock Indicator Pin
Pin 16 of connector J300 may be used to drive an LED or sensor to indicate that the SBX-4 is
locked to a beacon signal and is demodulating RTCM SC-104 data. The maximum current
available from this pin is 5 mA at an input voltage 3.3 V. The output of this signal may be
transistor buffered within your integration if greater current is required.
Figure 1-6 illustrates an example lock indicator circuit.
Figure 1-6: Lock indicator circuit