3-44
Theory of Operation
: Controller
3.2.6.5 Side Controls
The side controls include three programmable, momentary, pushbutton switches (Side Button 1
[SB1], Side Button 2 [SB2], Top Side Button [MON]) and a Push-To-Talk switch [PTT]. These
components interface to the Frontkit flex via connector J1 through a two-piece, bonded flex circuit.
The frontkit flex routes the side controls signals to the Main Board through connector J2302. See
Chapter 7
for pin out names and numbers.
Side button 1 (R4006), side button 2 (R4007) and the top side button (R6101) are inputs to the CPLD
and are biased to 1.875V. A button press is detected when the OMAP reads a 'LO' state from the
CPLD EMIFS interface. PTT (R4005) is connected directly to OMAP and a button press is detected
when a LO state is read.
3.2.6.6 GCAI
The GCAI (Global Communications Accessory Interface) connector is a 15 pin interface located on
the side of the radio. The connector interfaces the radio with accessories and is used for
programming. When the OMAP (U6501) detects that an accessory has been attached through a
logic low on GPIO0, it will identify the device by reading the GCAI_ONE_WIRE line. Once the device
type is identified, the appropriate signals are multiplexed through MAKO to the GCAI connector for
the particular device.
Figure 3-32
is a block diagram of the GCAI interface.
Mounted to the side connector is a flex that houses ESD protection circuitry. The universal side
connector interfaces with the Front kit flex via the J2 connector of a flex circuit and the P1000
connector of the keypad board. A keypad flex routes universal side connector signals through
keypad board connector P2000 to the main board. The figures below show the connections and
signal assignments from the universal connector to the controller board.
Figure 3-32. GCAI Signal Configuration
2
6
7
8
9
10
11
12
D+
D-
Vbus
One-Wire
ONE_WIRE
GPIO_4
GPIO_3
Preamp
USB
XCVR
1
3
4
5
One-Wire
GPIO_0
Ext Mic
GCAI
CONNECTOR
UART1_TX
UART1_RX
UART1_TX
UART1_RX
OPT_GPIO_3
OPT_GPIO_2
OPT_GPIO_0
GPIO
MA KO
OMAP1710
EXT
PA
KF Switch
CPLD
GPO
ONE_WIRE_GCAI
BATT_STATUS
VBUS
D+
D-
SPKR+
SPKR-
GND
MIC+
MIC-
OPTA_SEL_2
OPTA_SEL_1
OPTA_SEL_0
KEYFAIL CONTROL
KEYFAIL
MACE
TXEN
DAT
SE0
USB
PORT 0
GPIO
GPIO
Summary of Contents for APX 2000
Page 1: ...APXTM TWO WAY RADIOS APX 1000 APX 2000 APX 4000 APX 4000Li DETAILED SERVICE MANUAL ...
Page 4: ......
Page 6: ...iv Document History Notes ...
Page 8: ...Notes vi Commercial Warranty ...
Page 10: ...Notes ...
Page 22: ...xiv List of Figures Notes ...
Page 226: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 688: ...Index 4 Index Notes ...
Page 690: ...ii Notes ...
Page 700: ...xvi List of Figures Notes ...
Page 806: ...5 50 Troubleshooting Charts PA Failure Notes ...
Page 1008: ...8 178 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 84012621001 Notes ...
Page 1062: ...8 234 Schematics Boards Overlays and Parts Lists Keypad Board M2 and M3 PC000261A01 Notes ...
Page 1064: ...ii Notes ...
Page 1068: ...Notes A 4 EMEA Warranty Service and Technical Support Further Assistance From Motorola ...
Page 1090: ...Glossary 10 Glossary Notes ...
Page 1094: ...Index 4 Index Notes ...
Page 1095: ......