Advertisement
Flash memory
Note:
The flash memory stores the data that is written by the FPU (KPG-D3/D3N), tuning data (Deviation, Squelch, etc.), and firmware
program (User mode, Test mode, Tuning mode, etc.). This data must be rewritten when replacing the flash memory.
Mobile DDR (static memory)
Note:
Mobile DDR is used as a work area of the MPU.
2.4.6.3
LCD
LCD interface connector (CN6) of the SUB unit.
The LCD is controlled using parallel interface from MPU/DSP (IC404) through the interface connectors (CN1 of the TX-RX unit and
CN7 of SUB unit) and flexible cable.
2.4.6.4
Button Detection Circuit
Buttons are detected using I/O Expander IC (IC6) of the SUB unit. If pressed button is detected by IC6, it is informed to MPU/DSP
(IC404) of the TX-RX unit through serial line.
2.4.6.5
DSP
The DSP circuit consists of a MPU/DSP (IC404) and processes the baseband signal. The DSP operates at 288MHz (MAX) clock, the
I/O section operates at 3.2V/1.8V and the core section operates at 1.2V.
The DSP carries out the following processes:
• 4Level FSK processing
• Analog FM pre-emphasis/de-emphasis
• Vocoder processing between audio codec and modulation/demodulation
• CAI processing, such as error correction encoding
• QT/DQT encoding/decoding
• DTMF encoding/decoding
• MSK encoding/decoding
• 2-tone /5-tone encoding/decoding
• Compressor/expander processing
• Voice scrambler processing
• Transmit/receive audio filtering processing
• Microphone amplifier AGC processing
• Audio mute processing
• Modulation level processing
• Active Noise Reduction
• Voice recording/playback processing
• Voice announce processing
2.4.7 Power Supply Circuit
+B is connected to RF Power Module, 50BU regulator (Q15, Q16 and D13) through the fuse (F1), DC/DC converter IC (IC25) via fuse
(F1), SB1 switch (Q12 and Q13) through the fuse (F4) and SB2 switch (Q17 and Q18) through the fuse (F5).
Q15, Q16 and D13 regulates +B voltage to 5V (50BU). Then IC13 regulates 50BU to 3.1V (31BU). Then IC15 regulates 31BU to 1.2V
(12BU). 50BU, 31BU and 12BU operate whenever +B is supplied.
IC25 regulates +B voltage to 5.4V (54M). 54M is controlled by BAT_CNT signal from Power management IC (IC22). When Power
switch is turned on, BAT_CNT signal is controlled by /PSW signal. 54M goes to DC/DC converter ICs (IC24, IC12) and AVR ICs (IC20,
IC17, IC26, IC609, IC23).
IC24 (12M) is enabled while the 54M is operating. 12M provides the power to the MPU/DSP (IC404) and turns on IC12 (18M). 18M
provides the power to the MPU/DSP and DDR (IC402) and turns on IC20 (32M). 32M provides the power to the MPU/DSP, Flash
memory (IC401) and many control circuits and turns on IC17 (32A), IC26 (50A). Then 32A turns on IC21 (18M_3).
The Power management IC (IC22) watches +B voltage. If +B voltage is higher than 8.5V, IC22 outputs high voltage to the /BINT
terminal. If the /BINT is high, SB1 (Q12 and Q13) and SB2 (Q17 and Q18) are turned on by SBC signal from MPU/DSP (IC404). In
the same way, IC609 (50AC) and IC23 (50C) and IC19 (32C) are turned on by SBC. 50C is fed to IC14 (200C). IC14 (200C) is the
DC/DC boost converter. The 200C circuit then outputs approximately +20VDC.
SB1 supplies SUB unit and Audio power amplifier (IC601) with +B voltage. SB2 supplies D-sub unit and 9VAVR (IC1) with +B voltage.
Then IC1 regulates +B to 9V (90C). Then IC16 regulates 90C to 5V (50CT). If the MPU/DSP (IC404) controls TXC, ANT SW and
ASSW signals to High, Q20, Q23 (90T), Q21, Q22 (90ANT) and Q206 are turned on and transmission circuits are enabled to transmit.
When the Power management IC (IC22) and MPU/DSP (IC404) detect /PSW signal (Power switch), /IGN signal (Ignition sense) and
/BINT signal, they set the SBC signal to Low, and turn the transceiver power off.
When D20, Q11 detect over-voltage condition, they turn SB1 and SB2 off, and transfer that the MPU/DSP (IC404) through IC22.
(No.RA054<Rev.001>)1-19
Hide quick links:
Advertisement
