User Guide
24 of 35
002-36452 Rev. **
2022-10-07
CYW920819M2EVB-01 evaluation kit user guide
Hardware
3.3
Serial communication between CYW20819 and PSoC™ 5 KitProg3
The onboard CY8C5868LTI-LP039 PSoC
™
5LP device is a true programmable embedded system-on-chip
responsible for two channel USB-Serial conversion on this baseboard. The USB-serial pins of the PSoC
™
5LP
device are hard-wired to the HCI UART and PUART pins of the CYW20819 device. Because PUART RTS is not
routed to the USB-Serial device, any of the available LHL GPIOs can be assigned as PUART RTS using the Device
Configurator utility and connected using a jumper wire to the assigned Arduino header to use the flow control
mechanism provided by the PUART.
Note:
For applications involving low-power modes, the CYW920819M2EVB-01 evaluation board needs to
be reset after plugging it into the computer. This is due to the behavior of the serial
communication chip where it asserts the CTS pin for some time on power-up, which prevents the
CYW920819M2EVB-01 evaluation board from entering the low-power mode.
3.4
Power
The power supply system on this board is versatile, allowing the input supply to come from the following
sources:
•
1.8 V or 3.0 V from the on-board USB connector.
•
3 V from a coin cell battery.
shows the power architecture of the CYW920819M2EVB-01 evaluation board.
USB
Micro - B
PSoC
5
LP
3.0V Reg
1.8V Reg
Coin cell
Arduino headers
Peripherals
•
Analog mic
•
Digital mic
•
Serial flash
•
Ambient light sensor
•
Thermistor
M.2 card
VDDUSB
VDDP
VDDIO/
VBAT/
VPA_BT
Figure 10
Power Hi