CB-ACC-36【PDF 56/58 页】ANTENNA 1/2WV 2.4GHZ 10CM RPSMA

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Sheet目录52

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Version 1.17 2011-09

Figure 25: No restore switch used but a green

LED in a 3.3V host system. The status of the

signal can also be used as input to a host con-

troller.

Figure 26: No restore switch used but a green

LED in a 5V host system. The status of the

signal can also be used as input to a host

controller.

A serial resistor to the restore switch must be used to prevent a short circuit when the

GREEN/Switch-1 pin is in output HIGH state and the switch is pressed (see Figure 27).

Sometimes, over time, switch contacts can get an oxide layer. This may cause the closed

switch resistance to become too high to sink the signal to logic LOW (the signal is internally

pulled-up to 16k&). A design that prevents this can be found in Figure 28.

The GREEN/Switch-1 pin can be left unconnected if none of its functionality is required.

Figure 27: A low resistance restore

switch used. Notice the 1k&

& &

& serial resis-

tor.

Figure 28: If the resistance in the switch is not

guaranteed to be low enough, a safer design can

be used. Notice the 1k&

& &

& serial resistor.

A.2.3.4 Switch-0 Signal

Switch-0 is not multiplexed with other functionality and a switch is easily implemented (see

Figure 29).

Sometimes, over time, switch contacts can get an oxide layer. This may cause the closed

switch resistance to become too high to sink the signal to logic LOW (the signal is internally

pulled-up to 16k&). A design that prevents this can be found in Figure 30.

The Switch-0 pin can be left unconnected if its functionality is not used.

Figure 29: A low resistance function switch

used.

Figure 30: If the resistance in the switch is not

guaranteed to be low enough, a safer design

can be used.

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