CYW4343X
Table 23. WLCSP Signal Descriptions (Cont.)
Signal Name
WLCSP Bump
Type
Description or Instruction
WLAN GPIO Interface
WRF_GPAIO_OUT
67
O
Test pin. Not connected in normal operation.
Clocks
WRF_XTAL_XON
WRF_XTAL_XOP
CLK_REQ
75
O
I
XTAL oscillator output
XTAL oscillator input
74
153
O
External system clock request—Used when the system
clock is not provided by a dedicated crystal (for example,
when a shared TCXO is used). Asserted to indicate to the
host that the clock is required. Shared by BT, and WLAN.
LPO_IN
76
I
External sleep clock input (32.768 kHz). If an external 32.768
kHz clock cannot be provided, pull this pin low. However,
BLE will be always on and cannot go to deep sleep.
FM
FM_DAC_VOUT1
FM_DAC_VOUT2
FM_RFINMAIN
37
40
49
O
O
I
FM DAC output 1
FM DAC output 2
FM RF input
Bluetooth PCM
PCM or I2S clock; can be master (output) or slave (input)
PCM or I2S data input sensing
BT_PCM_CLK or BT_I2S_CLK
BT_PCM_IN or BT_I2S_DI
3
I/O
I
20
19
17
PCM or I2S data output
BT_PCM_OUT or BT_I2S_DO
BT_PCMM_SYNC or BT_I2S_WS
O
I/O
PCM SYNC or I2S WS; can be master (output) or slave
(input)
Bluetooth GPIO
BT_AGPIO
BT_GPIO_2
BT_GPIO_3
BT_GPIO_4
BT_GPIO_5
BT_TM1
52
13
5
I/O
I/O
I/O
I/O
I/O
I/O
Bluetooth analog GPIO
Bluetooth general purpose I/O
WPT_INTb to wireless charging PMU.
BSC_SDA to/from wireless charging PMU.
BSC_SCL from wireless charging PMU
ARM JTAG mode
8
10
4
Bluetooth UART and Wake
BT_UART_CTS_N
BT_UART_RTS_N
BT_UART_RXD
BT_UART_TXD
BT_DEV_WAKE
BT_HOST_WAKE
22
7
I
UART clear-to-send. Active-low clear-to-send signal for the
HCI UART interface.
O
I
UART request-to-send. Active-low request-to-send signal for
the HCI UART interface.
1
UART serial input. Serial data input for the HCI UART
interface.
12
6
O
I/O
I/O
UART serial output. Serial data output for the HCI UART
interface.
DEV_WAKE or general-purpose
I/O signal
11
HOST_WAKE or general-purpose I/O signal
Note: By default, the Bluetooth BT WAKE signals provide GPIO/WAKE functionality, and the UART pins provide UART functionality.
Through software configuration, the PCM interface can also be routed over the
BT_WAKE/UART signals as follows:
•
•
•
•
PCM_CLK on the UART_RTS_N pin
PCM_OUT on the UART_CTS_N pin
PCM_SYNC on the BT_HOST_WAKE pin
PCM_IN on the BT_DEV_WAKE pin
In this case, the BT HCI transport included sleep signaling will operate using UART_RXD and UART_TXD; that is, using a 3-Wire UART
Transport.
Document No. 002-14797 Rev. *H
Page 83 of 128
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