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6.3 Key RabbitNet Keypad/Display Interface Components
Figure 46 shows the locations of key RabbitNet Keypad/Display interface components.
J5
Auxiliary LCDM
Interface
Clocked Serial
Interface
J4
Main LCDM
Interface
J8
J2
ST Micro-
controller
Program
Port
J3
Buzzer
Contrast
Adjustment
R12
J1
RabbitNet
GND
Power
+5 V
Supply
n.c.
DCIN
J6
BACK ACT ALIVE
1  2   3  4  5   6  7   8   9 10 1112 131415 16
Keypad Interface
LIGHT
μP PWR
BAD GOOD
Figure 46. RabbitNet Keypad/Display Interface Pinouts
6.3.1 Headers and Jacks
RabbitNet Keypad/Display interfaces are equipped with one 1 × 4 friction-lock terminal at
J1 (DCIN and +5 V power supplies), and an RJ-45 RabbitNet jack.
No header is installed at J3, which is used to program the onboard microcontroller at the
factory. No header is installed at J8, which is reserved for future use.
6.3.1.1 Keypads
A 1 × 16 IDC header at J6 with a 0.1" pitch provides the keypad interface, and can accom-
modate keypads with up to 16 leads. A maximum of 64 keys can be handled in an 8 × 8
matrix.
To insure compatibility with the software driver routines, pin 1 on header J6 must always
be connected to a keypad strobe or data line; do not leave pin 1 unconnected.
Manufacturers typically supply keypads with flex connector tails, and can usually be
ordered with or without a connector on the flex connector tail. The traces on the connector
tails are most often spaced 0.1" center-to-center, and this is the only spacing supported by
the RabbitNet Keypad/Display interface since the pins on header J6 are spaced 0.1" apart.
Suitable keypads will not necessarily use all the pins that are available on header J6, but
will work as long as they meet the other criteria described in this section.
User ’s Manual
123
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