1
1
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AsteRx4_OEM
11
Sleep/off mode can be detected by the fact that the voltage at pin#29 (VCC_3V3_OUT) is
zero. Pin#29 can be used as an “enable” for the drivers driving the input pins.
When pull-up resistors are needed, 10k
is recommended. Always pull-up to 3.3V even
when using another voltage at the Vin pins. It is recommended to connect the pull-up
resistors to pin#29 (VCC_3V3_OUT). Never replace a pull-up resistor by a direct connection
to 3.3V as it could damage the board.
Conventions:
Pin Type: I=Input, O=Output, P=Power line, LVTTL=3V3 Low Voltage TTL.
LVTTL means VI
L
≤ 0.8V, VI
H
≥ 2.0V
, VO
L
≤ 0.4V, VO
H
≥ 2.4V.
