Display Module; Keypad Module; Table 4-5. Option-Select Functions - Motorola ASTRO XTS 5000 Detailed Service Manual

Detailed Theory of Operation
Most of the signals are extensions of circuits described in other areas of this manual. However, there
are two option select pins (see
Option Select 2. These pins are controlled by accessories connected to the universal connector.
Table 4-5 outlines their functions as defined at the universal connector. In the case of the XTS
Vehicular Adapter (XTVA), Option Select 1 pin is connected to Option Select 2 pin by a diode internal
to the XTVA.

4.3.4.4 Display Module

An optional, integral, 96 pixels by 64 pixels, LCD display module is available with either a 3 x 2
keypad with a navigational button (Model II radios) or 3 x 6 keypad with a navigational button (Model
III radios). The display module is connected to the VOCON board through flex connector J301. The
display module is not field repairable.
The display is controlled by the Patriot IC MCU core, which programs the display through the EIM
data lines D0 - D7 (pins 9 through 16, respectively), the display chip select line (pin 5), the EIM read/
write line (pin 8), and the EIM address 0 line (pin 7) that is used to select the register to be
programmed. The Patriot IC can reset the display module through pin 6. The display is supplied with
1.8 volts (B102) to pin 17 and 3.0 volts (B101) to pin 18.
Display backlighting is controlled by the Patriot IC GPIO line BL_EN signal through components
R140 and Q101. The LEDs on the display module are powered by 5 volts going through resistors
R101, R102, R103, and R104.

4.3.4.5 Keypad Module

The keypad module is connected to the VOCON board through flex connector J107. The keypad is
read though a row-and-column matrix made up of ROW1, ROW2, ROW3, ROW4, ROW5, ROW6,
and COL1, COL2, and COL3. When a key is pressed, a row and a column are connected to each
another. The Patriot IC determines a key press by a scanning algorithm. Each column line is
configured as an open drain output and pulled low. The Patriot IC then scans the row pins (each row
pin has an internal pull-up resistor). If a row signal is read low, then the Patriot IC determines that a
key was pressed. If none of the row signal lines are low, then another column line is pulled low and
the row scanning routine occurs.
The keypad backlighting is controlled by the Patriot IC GPIO BL_EN, and that signal goes to pin 6 of
the J107 connector. Pins 7 and 8 are supplied with 5 volts, which is used to power the LEDs on the
keypad module.
68P81094C31-O
: VOCON Board
Table 4-5) used to configure special modes: Option Select 1 and

Table 4-5. Option-Select Functions

Function
External PTT
No Function (Normal)
Man Down
External Speaker
XTVA
Option Option
Select 1 Select 2
0 0
1 1
1 0
0 1
Diode cathode Diode anode
4-23
April 15, 2002