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6881094C31-E
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3.2.4.6 Keypad Module
The keypad module is either a 6- x 3-button (Model III) or a 2- x 3-button (Model II) module with
backlighting.
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.
3.2.4.7 Controls and Control Top Flex
The universal flex assembly contains an On/Off switch/volume control knob, frequency selector
switch, push-to-talk (PTT) switch, monitor button, several function-selectable switches, universal
connector, speaker, and microphone.
The housing assembly top controls include the On/Off switch/volume control (S1), a 16-position
mode-select switch with programmable two-position concentric switch (U1), a programmable three-
position (A,B,C) toggle switch (S2), and a programmable top (orange) button (SW3). The side
controls include three programmable, momentary, pushbutton switches (side button 1 [SB2], side
button 2 [SB3], top side button [SB1]) and a PTT switch (SW2). These components are connected
through a flex circuit to the controller at J101 (see
Table 3-12, “Control Top Flex,” on page 3-37
). The
assembly also contains the radio's internal speaker and internal microphone.
is routed through switch S1 to provide the B+SENSE signal, which is used to activate the
SW_B+ and voltages that, in turn, power up the radio. Volume control is also provided by
S1, which contains a potentiometer biased between V2 regulated voltage and ground. The VOL
signal is a voltage level between V2 regulated voltage and ground, depending on the position of the
rotary knob. The VOL signal is fed to buffer U507 pin 3, and then the output of the buffer is voltage-
divided down to 2.5 volts before the signal goes to the GCAP II IC AD5 pin. The Patriot IC reads the
GCAP II IC A/D value through the SPI bus, and from this reading, the Patriot IC DSP adjusts the
speaker volume. In NNTN5567 VOCON kit, the VOL signal is fed directly to the MAKO IC U501 AD1
pin. There is no buffer or voltage division since the MAKO IC's AD pin is high impedance and tolerant
to 3 V. The dual-core processor reads the MAKO IC A/D value through the SPI bus, and from this
reading, the dual-core processor DSP adjusts the speaker volume.
Switch S2 is the three-position, programmable, toggle switch typically used for expanded
zone/channel selection. The switch can output the following voltages: 0 volts, half of the V2 regulated
voltage, or V2 regulated voltage (measurable at R231). The switch is connected to the GCAP II IC
AD1 input pin through the voltage divider network of R519 and R523. But for NNTN5567, the switch
is connected to MAKO IC AD3 input pin through R224. The Patriot IC reads the A/D value through
the SPI bus, and it uses that reading to determine the position of the toggle switch.
The programmable top (orange) button SW3 is typically used for emergency. This button, along with
programmable side buttons SB1 through SB3, is connected to a resistor divider network, biased
between V2 regulated voltage and ground. This network, made up of R1, R2, and R3, provides a
voltage level, controlled by whichever button is pressed, to pin 3 of buffer U504. The output of the
buffer is voltage- divided down to 2.5 volts before the signal goes to the GCAP II IC AD0 pin. The
Patriot IC reads the GCAP II IC A/D value through the SPI bus, and it uses that data to determine
which button was pressed.
Summary of Contents for ASTRO XTS-5000
Page 7: ...vi Table of Contents November 16 2006 6881094C31 E Notes ...
Page 11: ...x List of Figures November 16 2006 6881094C31 E Notes ...
Page 17: ...November 16 2006 6881094C31 E xvi CommercialWarranty Notes ...
Page 31: ...November 16 2006 6881094C31 E xxx Portable Radio Model Numbering System Notes ...
Page 83: ...November 16 2006 6881094C31 E 3 44 Theory of Operation Encryption Module ...
Page 135: ...November 16 2006 6881094C31 E 5 44 Troubleshooting Charts Secure Hardware Failure Notes ...
Page 175: ...November 16 2006 6881094C31 E 7 32 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 367: ...November 16 2006 6881094C31 E Glossary 10 Notes ...
Page 373: ...Index 6 November 16 2006 6881094C31 E Notes ...