Newland EM3296, Руководство по интеграции

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Good Read LED
The EM3296 provides a pin (LED, PIN 10) on the host interface connector that can be used by an external
driver circuit to drive an LED to indicate a Good Read status. When a good read occurs, the LED pin
produces a high level output and then the signal is back to a low level. This Good Read LED output is not
strong enough to drive an LED, so an LED driver circuit is needed.
The following Good Read LED driver circuit is provided for reference.
2N3904
Q8
R1 1K
LED
R3
1k
LED
D3
R2
10K
VDD