WF121 datasheet(13/41 Pages) ETC2

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5.3

2C/SPI

Pad number

SPI

SS4

– Slave select SPI 4

SCK4 - Clock SPI 4

SCL3

– Clock I

2C 3

SDO3

– Data out SPI 3

SDA3

– Data I

2C 3

SDI3

– Data in SPI 3

SDA5

– Data I

2C 5

SDI4

– Data in SPI 4

SCL5

– Clock I

2C 5

SDO4

– Data out SPI 4

SDA1

– Data I

2C 1

SS3

– Slave select SPI 3

SCL1

– Clock I

2C 1

SCK3

– Clock SPI 3

Table 4: Pads for I2C and SPI

Up to three I

2C-ports and up to two SPI ports can be implemented, mostly multiplexed on the same pins

together and with the UART signals. The I

2C ports support 100 kHz and 400 kHz speed specifications, while

the SPI can be operated at up to 40 Mbps. The SPI ports are also available for use as a host connection for

use with an external microcontroller.

For details on the SPI/I2C hardware, please refer to Microchip documentation on SPI and I2C.

To see what other functions are present on the same pins, please refer to Table 2.

5.4

USB On-The-Go

Pad number

Function

Description

OTG_ID

USB-OTG mode identify line

VBUS

USB bus supply input

D-

Data -

D+

Data +

VBUSON

USB bus supply switch enable in host mode

Table 5: USB pads

The module contains a USB-OTG system with an integrated transceiver. Full Speed (12 Mbps) USB 2.0

profile is supported in device mode, while the host system can operate in Low Speed and Full Speed modes.

For host use an external switch can be implemented to provide switched power for the connected device. Pad

number 24 can be dedicated to control this switch. The USB device can be used as a host connection,

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