Motorola CM160 Информация о сервисе - Страница 10
Просмотреть онлайн или скачать pdf Информация о сервисе для Радио Motorola CM160. Motorola CM160 26 страниц. Commercial series controlhead
Также для Motorola CM160: Руководство пользователя (5 страниц), Руководство пользователя (46 страниц), Базовое руководство пользователя (12 страниц)
2-4
3.0
Controlhead Model for CM160 and CM360
The controlhead contains the internal speaker, the on/off/volume knob, the microphone connector,
several buttons to operate the radio, three indicator Light Emitting Diodes (LED) to inform the user
about the radio status, and an 8 character Liquid Crystal Display (LCD) for alpha - numerical
information e.g. channel number or call address name.
LED
LED
Backlight
Backlight
Backlight
Backlight
Control
Control
Keypad
Keypad
Resistors
Resistors
Keypads
Keypads
3.1
Power Supplies
The power supply to the control head is taken from the host radio's 9.3V via connector J103-9, The
9.3V is used for the LEDs and back light, the 5V is used for the LCD driver (U3) and level shifter
(U4). The stabilized 3V is used for the other parts.
3.2
SPI Interface
The host radio (master) communicates with the control head through its SPI bus. Three lines are
connected to the shift register (U8):SPI clock (J103-17), SPI MOSI (J103-16), shift register chip
select (J103-15) and LCD driver chip select (J103-18).
When the host radio needs to send date to the shift register, the radio asserts the shift register chip
select and the data is loaded to the shift register. For example, the host radio sends data to change
display channel or change LED status.
9.3V
9.3V
LED
LED
Indicators
Indicators
Control line
Control line
Boot_Res / SCI
Boot_Res / SCI
Mux.
Mux.
Control
Control
DTMF
DTMF
Row/Column
Row/Column
Row/Column
Row/Column
LCD
LCD
LCD
LCD
Level
Level
Driver
Driver
Shifter
Shifter
9.3V
9.3V
Shift
Shift
Register
Register
PTT
PTT
circuit
circuit
Boot_Res (DTMF-
Boot_Res (DTMF-
Column)/ SCI
Column)/ SCI
(DTMF-Row)
(DTMF-Row)
THEORY OF OPERATION
8 pin JACK
8 pin JACK
connector
connector
2-pin speaker
2-pin speaker
connector
connector