WL865E4-P Module Hardware User Guide
1VV0301580 Rev. 4
Page
25
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56
2019-08-08
5.5.3.
SDIO
One SDIO Slave interface:
•
Compliant to SDIO v2.0 specification
•
Interface clock frequency up to 48 MHz
•
Data transfer modes: 4-bit SDIO, 1-bit SDIO, SPI
5.5.4.
SPI
Two general-purpose SPI interfaces. One configured as master only and a second one can
be configured as master or slave where pin-mux with SDIO interface pins.
•
Interface clock frequency up to 48 MHz
5.5.5.
I2C
The I2C Master/Salve interface has weak internal pull-up. If necessary add external ones
of 10K down to 1K.
5.5.6.
USB
USB 2.0 device interface provides a simplified, high-speed, and scalable manufacturing test
and configuration interface for QCA4020-based systems.
It is not used for normal operation, use it only for testing and Bootloader interface.
VUSB is only 3V3 volts. You can directly connect it to VDD_BLE. The USB plug/unplug
detection is done through the data pins.
General purpose I/O
The module has 37 GPIO which can be configured as Input, Output or as Alternate Function.
The default Function, GPIO or Alternate, direction and Internal PU/PD at startup are
described here.
GPIO
Alternate Function
Direction
Internal
PU/PD
GPIO_01
WAKEUP
Input
PD
GPIO_02
BT_PRIORITY
3 wire PTA, INPUT when slave, OUTPUT when master
Input/Output
GPIO_03
WIFI_ACTIVE
3 wire PTA, INPUT when slave, OUTPUT when master
Input/Output
GPIO_04
BT_ACTIVE
3 wire PTA, INPUT when slave, OUTPUT when master
Input/Output
GPIO_05
PWM_OUT0
(Digital to Analog Converter, DAC)(PWM)
Output
GPIO_06
I2C_SDA
Input/Output PU
