24
PCM_CLK
I/O
PCM clock
1.8V
25
GND
G
Ground connections
26
PCM_IN
I
PCM data input
1.8V
27
PCM_SYNC
I/O
PCM sync signal
1.8V
28
GND
G
Ground connections
29
UART_RTS_N
O
Bluetooth UART interface
1.8V
30
UART_TXD
O
Bluetooth UART interface
1.8V
31
UART_RXD
I
Bluetooth UART interface
1.8V
32
UART_CTS_N
I
Bluetooth UART interface
1.8V
33
GND
G
Ground connections
The VBAT pin can accept 3.3V +/- 5%. Typical value is 3.3V, but this depends on the motherboard.
Mainboard through UART bus to send HCI commands to activate Bluetooth function.
The UART is a standard 4-wire interface (RX, TX, RTS, and CTS) with adjustable baud rates from
9600 bps to 4.0 Mbps. The interface features an automatic baud rate detection capability that
returns a baud rate selection. Alternatively, the baud rate may be selected through a
vendor-specific UART HCI command
The UART has by default the following characteristics (can be reprogrammed to up to 4Mbps)
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