EVBUM2769/D
3
Power Supply
The enable pins of three LDOs on the Main Board are
connected to pins of LC786830 via jumpers. Thus, place
shunt jumpers on pins 2 and 3 of JP1, JP2 and JP3 before
powering the Main Board except when each state can be set
by GPs. Refer to the following table and figure. After that,
connect the plug of a 12 V power supply to the DC jack
(CN501, center positive, up to 4 A).
Table 1. JPS OF POWER SOURCE
Jumper Name
Function
Jumper Pin #
State
JP1
Enable 3.3 V
(DVDD2)
1
GP00_1
3
ON
JP2
Enable 5 V
(5V)
1
GP00_2
3
ON
JP3
Enable 8 V
(CDV)
1
GP00_0
3
ON
Figure 4. The Locations of JPs
JP1
JP2
JP3
Programing the Flash on the Board
The Flash Writer Application can program the flash
memory on the Main Board from your PC over the
Downloader Board. The Flash Write Application is
available from the onsemi.com website.
Figure 5. Flash Writer Application
M0+ Code File
Process Indicator (%)
Figure 6. Connect the Downloader Board to your PC
Applications
Bluetooth module NF2210EZ is embedded on the Main
Board with printed antenna so that it is easy to establish a
Bluetooth connection with a phone or other device. An
electret condenser microphone is also embedded on the
Board for hands
−
free communication. It has a gain of 40 dB.
If you do not achieve that in your environment, please
replace resistors, R662 and R665 to adjust the gain.
Although the built
−
in DAC of the LC786830 supports up to
96 kHz sampling rates, external DACs which can accept
192 kHz sampling rates also are featured on the Board so
that 192 kHz sampling rates playback is acceptable. When
the output level of GP04_4 is low, built
−
in DAC outputs are
connected with RCA jack. When the output level of GP04_4
is high, external DAC outputs are connected with RCA jack.
Refer to the schematic of the Main Board. The 3.5 mm phone
jack is connected to a differential input on the LC786830 to
accept an analog input. The Main Board also has an
EEPROM for backup applications such as storing volume
settings. The SD Card socket is embedded on the solder side
as well. The Main Board can mount PSRAM but the
PSRAM needs to use same ports of LC786830 as the SD
Card control. Therefore, when PSRAM is available, the SD
Card solution is not available. In addition to that, there are
a piezo speaker and an IR receiver on the Main Board for
applications. Furthermore, the Main
Board can be connected
with ON Semiconductor’s CD playback Board so that it is
easy to support a CD solution. A dedicated IIC interface is
available for MFi, via a CN102A terminal on the Main
Board.
For details of each component on the Boards, refer to its
datasheet.
Debugging
A Serial Wire Debug interface is available for debugging.
CN103 (JTAG 20
−
pin connector) on the Main Board is its
adaptor connector.
Table 2. CN103 PIN ASSIGNMENT
CN103 Pin#
Name
Function
7
SWDIO
SWD data I/O
9
SWCLK
SWD clock
1, 2
3.3 V
Power
4, 6, 8, 10, 12, 14,
16, 18, 20
GND
Ground
Figure 7. Debugger Connected with CN103
Also, TP108 (TX0), TP109 (RX0), are prepared for
UART data logger monitor use in debugging.
