EVK-JODY-W3 - User guide
UBX-20030840 - R04
Board description
Page 21 of 29
3.7
Bluetooth host interface
The Bluetooth UART host interface of the JODY-W3 series module can be accessed either directly
through the UART pins on J305, or through the USB type-C connector through a USB-to-UART bridge
(default).
A USB-to-UART bridge (FTDI FT231X) is included on the evaluation board to connect to the high speed
UART interface of the JODY-W3 series module.
VDD_USB3
from the USB connector is converted by
a DC-DC to 3.3 V and can be used for supplying
3V3
from the USB interface. Place the jumper on J400
to use Bluetooth through the USB type-C connector.
Figure 14: Jumper setting to use Bluetooth over USB
The 4-pin UART interface of the JODY-W3 series modules can be directly accessed through the
Bluetooth UART connector J305. To use the UART interface directly, remove the jumper on J400 and
connect the UART host interface to the respective module side pins and signal ground on J305 as
shown in Figure 15 and Table 9. The UART signals are powered by the
VIO
voltage domain.
Figure 15: Bluetooth over UART interface
Name
I/O
Description
Remarks
UART_TXD
O
UART TX signal
Connect to Host RX
UART_RXD
I
UART RX signal
Connect to Host TX
UART_RTS
O
UART RTS signal
Connect to Host CTS
UART_CTS
I
UART CTS signal
Connect to Host RTS
Table 9: UART signal description
3.8
Bluetooth audio interface
A MAX9860 16-bit audio codec for Bluetooth voice applications is provided on the JODY-W3 EVB and
connected to the PCM/I2S interface of the module. A 3.5 mm audio jack (J206) to connect a headset
is available on the bottom side of the EVB. The codec is operated with a master clock (MCLK) of
19.2 MHz. The MAX9860 audio codec is completely controlled through software using an I2C
interface. The codec responds to the I2C slave address 0x20 for all write commands and 0x21 for all
read operations.
J400
J400
