Motorola ASTRO XTS 5000 Detailed Service Manual page 55

Theory of Operation
: VOCON Board
NOTE: Refer to
of VOCON schematics that will aid in the following discussion.
3.2.1.1 Universal Connector J101
This is a 40-pin connector that mates with the universal flex on the housing. A majority of the lines on
the connector are for user interface: emergency and side buttons (pin 14), monitor button (pin 17),
secure/clear switch (pin 23), frequency switch (pins 24, 25, 26, and 27), volume knob (pin 31), and
the three-position switch (pin 34). The LEDs on the universal flex are controlled through pins 20, 21,
and 22. Connections to the external accessory connector, which include serial communication data
lines, external audio, and option select lines for controlling audio modes, are present at pins 1
through 13. Switched battery voltage (B+SENSE) is provided on pin 32. Most of the pins at this
connector have ESD protection devices and components.
3.2.1.2 Encryption Connector J701
This 40-pin connector provides the interface between the VOCON board and the encryption module.
Two voltages are provided to the encryption board: UNSWB+ and SWB+. The SAP SSI lines, serial
communication data lines, and general-purpose I/O lines from the Patriot IC are included in the
interface to the encryption board. A number of jumpers are present on some of the lines so that the
VOCON board configuration to the encryption board can be changed depending on the encryption
type present.
3.2.1.3 Keypad Module Connector P107
This 22-pin connector mates the VOCON board to the keypad module flex used on Model II and III
radios. The keypad module is provided with 5 volts (pins 7 and 8) for the LEDs. The LEDs are
activated by the signal at pin 6, BL_EN. The row signal lines (pins 13, 14, 15, 16, 17, 18, and 19) and
column signal lines (pins 1, 2, and 3) are all at the dual-core processor's GPIO voltage.
3.2.1.4 RF Interface Connector P201
This is a 26-pin compression connector that interfaces between the VOCON board and the
transceiver board. See Section
description of the interface between the VOCON and transceiver boards through P201. Ground clip
M202 is used on the bottom side of the VOCON board to contact the transceiver shield. This
additional connection provides a consistent, common ground with the VOCON board and the radio
chassis.
3.2.1.5 Display Module Connector P301
This 22-pin connector mates the VOCON board to the display module flex used on Model II and III
radios. The NTN9564 VOCON kit has a parallel data interface to the display module. In this design,
two voltages are provided to the display module: 1.8 V and 3 V. The display's parallel data lines (pins
9, 10, 11, 12, 13, 14, 15, and 16), chip select line (pin 5), read/write line (pin 8), register select line
(pin 7), and parallel/serial configuration line (pin 4) are at 1.8-V logic levels.
The NNTN4563 and NNTN4819 VOCON kits have a serial data interface to the display module. In
this design, only 3 V is provided to the display module on pins 17 and 18. The display's serial data
line (pin 16), serial clock line (pin 15), chip select line (pin 5), and register select line (pin 7) are at 3 V
logic levels. The NNTN4717 VOCON board has a serial data interface to the display module, and all
the lines are at 2.9 V logic levels.
3.2.2 Controller and Memory
The controller and memory section contains the following components:
• Patriot IC (U401)
6881094C31-D
Table 8-2, "List of VOCON Schematics and Board Overlays," on page 8-1
3.1.1.2 " VOCON Connector P1," on page 3-3
3-17
for a listing
for a detailed
July 21, 2004