Applied Data Systems Bitsy Plus, User Manual, Page: 20 / 68

Bitsy Plus User’s Manual
Page 10 ADS document # 110114-1001A
3.2.1 JP3: Flat Panel Power Select
Type: 3-post header, 2mm
This jumper selects the supply voltage for the flat panel. It is located near the PCMCIA ejector
button.
Jumper setting Voltage Selected
1-2 Vddx (3.3 V)
2-3 Vcc (5.0 V)
WARNING! Make sure you have selected the correct voltage before connecting the panel. Flat
panels are notoriously sensitive to--and are often irreparably damaged by--incorrect voltages.
3.2.2 JP4: Vee Polarity Select
Type: 3-post header, 2mm
This jumper selects the polarity of Vee, the contrast control voltage for passive displays. Vee is
controlled with a PWM signal from the ADSmartIO (section 4.3). See section 4.6.7 for further
details bout Vee.
Jumper setting Vee
1-2 positive
2-3 negative
n/c no Vee
3.3 Connector Pinouts
The following tables describe connector pinouts and the type of connector. At least one pin of
every connector is labeled on the Bitsy Plus. Pin 1 of the connector is also
typically indicated by a square pad where the pin is soldered to the board.
As seen from the component side
5
, double-row headers on the board are all
numbered as shown in the figure to the right.
For information about the location of the connectors on the Bitsy Plus, refer to section 6.1.1.
Legend: n/c Not connected
GND Bitsy Plus ground plane
(3.3) Reference sections for signals
I signal is an input to the system
O signal is an output from the system
IO signal may be input or output
P power and ground
A analog signals
OC open collector output
5
The "component side" of the Bitsy Plus is the one on which the PCMCIA ejector is installed. As
a factory option, some connectors may be installed on the "bottom side" of the Bitsy Plus.
2 4 6 8...
1 3 5 7...