(No.RA012<Rev.001>)1-11
2.3.8.2
For Digital Voice Mode
If the digital data matches in the MCU, the digital voice payload data will go into the Vocoder in the MCU for conversion to PCM. The
PCM data will go to the baseband IC through the SPI input, where it will be converted to analog by the DAC. Analog voice will be
filtered and finally sent to the audio amplifier.
Fig.9 dPMR receiver system
2.3.9 dPMR Transmitting
2.3.9.1
For Digital Voice Mode
The analog voice from the microphone will go to the ADC (after the audio filter) to convert to PCM data. The PCM data will be sent to
the Vocoder through the SPI output. The Vocoder will convert the PCM to dPMR protocol, where it will be sent to the baseband through
the C-BUS. In the baseband IC, the data will be encoded and finally transmitted through the TCXO and VCO modulation.
Fig.10 dPMR transmit system
2.4
SEMICONDUCTOR DATA
2.4.1 MCU: 2F405VGT6KFAA (TX-RX unit IC710)
54
43
16
13
79
IC400
FM IC
IC705 Baseband IC
C-BUS
SPI
Vocoder
C-BUS
dPMR
decoder
Audio
Output
To Audio AMP
DAC
3
IC710 MCU
23
42
1
4
2
IC705 Baseband IC
C-BUS
SPI
Vocoder
C-BUS
dPMR
encoder
Audio
Filter
From MIC
TCXO
VCO
ADC
53
80
IC710 MCU
Pin
No.
Name
I/O
Function
1
MINVOL
O Minimum volume control
2
DCSW
O APC voltage discharge switch
3
APCSW
O APC switch
4
TEST_1
O Test land 1
5
TEST_2
O Test land 2
6
VBAT
-
3.3V
7
BLULED
O Blue LED light control (Hi: LED ON)
8
BSHIFT
O MPU clock frequency shift
9
INSPMT
O Internal speaker mute
10 VSS1
-
GND
11 VDD1
-
3.3V
12 XIN
I
Crystal (19.2MHz)
13 NC
O No connection
14 NRST
I
MCU reset input
15 LSDI
I
QT/DQT decode
16 HSDDEC
I
2-tone decode
17 VOX
I
VOX level input
18 OPT4
I/O Option port 4
19 VDD
-
33MD
20 VSSA
-
GND
21 VREF+
-
33M
22 VDDA
-
33M
23 5CC
O 5C control
24 CVIN
I
VCO lock voltage (for automatic
alignment)
25 EMPTT
O Emergency PTT
26 50VC
O 5V AVR control for GPS MIC
option/OPT detection
27 VSS2
-
GND
28 VDD3
-
33MD
29 LSDO
O QT/DQT output
30 HSDENC
O BEEP/HSD output
31 5RC
O 5R control
32 5TC
O 5T control
33 BATT
I
Battery level input
34 RSSI
I
RSSI input
35 BUSY
I
BUSY input
36 TH_DET
I
Thermistor detection (Temperature
detection)
37 33MSC
I/O 33M switch control
38 OPT1
O Option port 1
Pin
No.
Name
I/O
Function
