CB-ACC-36【PDF 54/58 页】ANTENNA 1/2WV 2.4GHZ 10CM RPSMA

Version 1.17 2011-09

A.2.3.2 RED Signal

The RED logic LED signal is not multiplexed with any other functionality, which makes the

design more straightforward. See Figure 21 for a 3.3V design.

In a 5V system the high state output (2.8V) from the module is not enough to turn off the

LED so a 74HCT08 buffer can be used to raise the high level to 5V (see Figure 22).

The 74HCT08 gate is available in a single gate package (74AHCT1G08).

Figure 21: A red LED in a 3.3V host system. The

status of the signal can also be used as input to a

host controller.

Figure 22: A red LED in a 5V host system. The

status of the signal can also be used as input

to a host controller.

The RED signal pin is also used to select Logic Level mode (instead of RS232) for con-

nectBlue product with internal RS232 driver. The mode functionality is not applicable on cB-

0901 because there is no internal RS232 driver available. To be compatible with these prod-

ucts check the datasheet about this signal.

The Red signal is not allowed to be pull-down when using the SerialSelect signals for

RS485/RS422 (see A.2.2.4).

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