ST STEVAL-IOD002V1, User Manual, Page: 3 / 14

To alternatively supply the STM32 Nucleo development boards independently via USB:
• close JP5 to U5V on NUCLEO-L073RZ development board
• close JP2 pins 1-2 on NUCLEO-G071RB and ensure J8 is left open
Figure 2. STEVAL-IOD002V1 expansion board digital section
dotted line indicates the digital interface section
The four Arduino UNO R3 connectors also allow the expansion board to communicate with the STM32 Nucleo
development board via the following STM32 peripheral and GPIO resources:
•
SPI (CN5, CN8): control interface allowing communication between the MCU (SPI master) and the L6364W
(SPI slave) to configure the internal L6364W register or read the status registers. In Single-Byte and
Multi-Byte Communication Modes, the SPI is also used for the data transfer to and from the sensor.
• INT (CN9): interrupt line driven by the L6364W to alert the MCU of a new event. The MCU reads the status
register of the L6364W via the SPI interface to determine which event occurred.
• UART TX (CN5), UART RX (CN9): interface for sensor data transfer via CQ line used by the MCU in
Transparent Communication Mode. When this mode is selected, JP4 and JP5 jumpers must be closed.
• CTLD (CN8): the L6364W provides the DIO as a secondary digital input/output pin. In DIO Mode, this pin
can be controlled by SPI (similar to CQ) or in direct mode by CTLD pin (J9 must be closed).
1.1.2 Power section
The power section (CN1, CN2, CN3) includes the power supply voltage (L+, L-), the transmission lines (CQ, DIO),
the output voltage of the step-down converter (VDCDC) and the additional supply rail (DOUT), which is protected
against reverse polarity by the diode embedded in the
L6364W .
CN1 and CN2 are usually connected to the corresponding pins of an IO-Link Master (e.g. P-NUCLEO-IOM01M1 )
that controls communication and supplies the STEVAL-IOD002V1 via the L+ rail. The CQ line is used to
exchanged data between IO-Link Master and IO-Link Device. The DIO line is the additional digital channel
typically used in the port class A (type A). L- is the electrical ground reference between the two systems.
CN3 is an additional connector allowing further connections, such as for actuators.
UM2822
Overview
UM2822 - Rev 1
page 3/14