High Speed Uart Interface - Ublox JODY-W1 Series System Integration Manual

Pull-up resistors are required for all SDIO data and command lines. These pull-up resistors can be
provided either externally on the host PCB or internally in the host application processor. Depending
on the routing of the SDIO lines on the host, termination resistors in series to the lines might also be
needed. See also Data communication
Name I/O
SD_CLK I
SD_CMD I/O
SD_D0 I/O
SD_D1 I/O
SD_D2 I/O
SD_D3 I/O
Table 10: SDIO signal definition
The SDIO host interface pins of the module are powered by the VIO_SD voltage domain.
1.5.3

High Speed UART interface

The JODY-W1 series modules support a high-speed Universal Asynchronous Receiver/Transmitter
(UART) interface with the following features:
• Two 1040-byte FIFO for transmit and receive to support BT EDR
• Bluetooth UART HCI transport specification: H4
• 2 pins for transmit and receive operations
• 2 flow control pins (RTS/CTS)
• Interrupt triggers for low-power, high throughput operation
• Supports standard baud rates and high throughput up to 4 Mbps. The default baud rate after reset
is 115.2 kbaud.
An example of common baud rates supported by the UART interface is listed in
operation, baud rate error must be kept within ±2%.
Name I/O
BT_UART_TX O
BT_UART_RX I
BT_UART_RTS O
BT_UART_CTS I
Table 11: UART signal description
Desired Rate [kbaud]
4000.0
3692.0
3000.0
2000.0
1500.0
1444.444
921.6
460.8
230.4
115.2
57.6
38.4
UBX-16012621 - R18
C1-Public
interfaces.
Description
SDIO Clock input
SDIO Command line
SDIO Data line bit [0]
SDIO Data line bit [1]
SDIO Data line bit [2]
SDIO Data line bit [3]
Description
UART TX signal
UART RX signal
UART RTS signal
UART CTS signal
Actual Rate [kbaud]
4000.0
3692.308
3000.0
2000.0
1500.0
1454.544
923.077
461.538
230.796
115.385
57.692
38.4
System description
JODY-W1 series - System integration manual
Remarks
External PU required
External PU required
External PU required
External PU required
External PU required
Remarks
Connect to Host RX
Connect to Host TX
Connect to Host CTS
Connect to Host RTS
Error [%]
0.00
0.01
0.00
0.00
0.00
0.70
0.16
0.16
0.17
0.16
0.16
0.00
Table 12. For proper
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