ADVANCE
CYW43570
Table 19. Signal Descriptions (Cont.)
Ball
Signal Name
Type
Description
Bluetooth UART
E2
BT_UART_CTS_L
I
UART clear-to-send. Active-low clear-to-send signal for the HCI
UART interface.
A15
BT_UART_RTS_L
O
UART request-to-send. Active-low request-to-send signal for
the HCI UART interface. BT LED control pin.
E1
F2
BT_UART_RXD
BT_UART_TXD
I
UART serial input. Serial data input for the HCI UART interface.
O
UART serial output. Serial data output for the HCI UART
interface.
Bluetooth I2S
G1
H8
BT_I2S_CLK
I/O
I/O
I/O
I/O
I2S clock, can be master (output) or slave (input).
I2S data output.
I2S data input.
BT_I2S_DO
BT_I2S_DI
BT_I2S_WS
H10
E5
I2S WS; can be master (output) or slave (input).
Bluetooth GPIO
G5
BT_GPIO_4
I/O
I
Bluetooth general-purpose I/O.
Miscellaneous
E18
WL_REG_ON
Used by PMU to power up or power down the internal
CYW43570 regulators used by the WLAN section. Also, when
deasserted, this pin holds the WLAN section in reset. This pin
has an internal 200 kΩ pull-down resistor that is enabled by
default. It can be disabled through programming.
H15
BT_REG_ON
I
Used by PMU to power up or power down the internal
CYW43570 regulators usedby the Bluetooth section.Also, when
deasserted, this pin holds the Bluetooth section in reset. This pin
has an internal 200 kΩ pull-down resistor that is enabled by
default. It can be disabled through programming.
J1
J2
BT_DEV_WAKE
BT_HOST_WAKE
I/O
I/O
Bluetooth DEV_WAKE.
Bluetooth HOST_WAKE.
Integrated Voltage Regulators
B23 SR_VDDBATA5V
C22, C23 SR_VDDBATP5V
A20, A21 SR_VLX
I
Quiet VBAT.
Power VBAT.
I
O
CBUCK switching regulator output. Refer to Table 33 on
page 74 for details of the inductor and capacitor required on this
output.
D22, D23 LDO_VDD1P5
I
LNLDO input.
G22, G23 LDO_VDDBAT5V
I
LDO VBAT.
Y23
W23
K23
H23
J23
WRF_XTAL_VDD1P5
WRF_XTAL_VDD1P2
VOUT_LNLDO
I
XTAL LDO input (1.35V).
XTAL LDO output (1.2V).
Output of LNLDO.
O
O
O
O
O
O
O
VOUT_CLDO
Output of core LDO.
VOUT_LDO2P5
2.5V LDO. Connects to a 2.2 F bypass capacitor to GND.
3.3V LDO.
E22, E23 VOUT_LDO3P3_B
F22, F23
F19
VOUT_3P3
LDO 3.3V output.
VOUT_3P3_SENSE
Voltage sense pin for LDO 3.3V output.
Bluetooth Supplies
P1
L1
BT_PAVDD2P5
BT_LNAVDD1P2
PWR
PWR
Bluetooth PA power supply.
Bluetooth LNA power supply.
Document Number: 002-15054 Rev. *I
Page 53 of 94
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