Introduction
The STMod+ fan-out expansion board provides extension connectors for the direct use of popular third-party modules from
different manufacturers. It can be used with the STM32 Discovery boards or Evaluation boards featuring an STMod+ connector
to increase the demonstration scopes of their STM32 microcontrollers.
This board is also referred to as the Fanout board or MB1280 in STMicroelectronics related technical literature.
The STMod+ fan-out expansion board features:
•mikroBUS™ compatible connectors
• ESP‑01 compatible connector
•Seeed Studio™ Grove compatible connectors
• Reserved standard 2.54 mm pitch pin header for breadboard
• 5 V power
• 3.3 V regulator
•I2C level shifters (footprint only)
Figure 1. Fan-out board (MB1280) top view
Picture is not contractual.
The board is delivered as part of the products listed in Table 1.
Table 1. Products featuring the fan-out board (MB1280)
Type Products
STM32 Discovery kits 32F723EDISCOVERY, 32L496GDISCOVERY, 32L4R9IDISCOVERY, STM32F7308-DK, STM32H745I-DISCO,
STM32H747I-DISCO, STM32H750B-DK, STM32H7B3I-DK, STM32L562E-DK.
STMod+ fan-out expansion board
for STM32 Discovery kits and Evaluation boards
UM2695
User manual
UM2695 - Rev 1 - March 2020
For further information contact your local STMicroelectronics sales office.
www.st.com
1Hardware layout and configuration
The design of the MB1280 fan-out board is based on the STMicroelectronics STMod+ connector. Refer to
technical note STMod+ interface specification (TN1238) for details.
Figure 2 illustrates how the fan-out board extends the Discovery boards and Evaluation boards connections to
other modules. Figure 3 helps to locate the various connectors on the fan-out board.
Figure 2. Fan-out board hardware block diagram
Fan-out board
STM32 board Third-party
module
STMod+
female connector
mikroBUS™
ESP-01
Grove I2C
Grove UART
Breadboard
STMod+
male connector
Figure 3. Fan-out board layout
CN1
STMod+
CN2
Grove UART
CN4
ESP-01
CN5 / CN7
3.3 V power
CN10 / CN11
mikroBUS™
JP1
3.3 V / 5 V
selection
CN9 / CN12
Breadboard
pad
CN6 / CN8
5 V power
CN3
Grove I2C
UM2695
Hardware layout and configuration
UM2695 - Rev 1 page 2/12
