ST STMod+ User manual
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
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Hardware layout and configuration
UM2695 - Rev 1 page 2/12
2Connectors
2.1 STMod+ male connector CN1
The standard 20-pin STMod+ male connector is available on the fan-out board for connection to the STMod+
female connector on the STM32 board featuring an STM32 microcontroller based on the Arm® Cortex®-M
processor. Table 2 shows the definition of the pins.
Table 2. Description of the STMod+ connector pins
STMod+ connector Pin number Pin number STMod+ connector
STMod+#1-NSS/CTS 1 11 STMod+#11-INT
STMod+#2-MOSIp/TX 2 12 STMod+#12-RST
STMod+#3-MISOp/ RX 3 13 STMod+#13-ADC
STMod+#4-SCK/RTS 4 14 STMod+#14-PWM
GND 5 15 5 V
5 V 6 16 GND
STMod+#7-SCL 7 17 STMod+#17
STMod+#8-MOSIs 8 18 STMod+#18
STMod+#9-MISOs 9 19 STMod+#19
STMod+#10-SDA 10 20 STMod+#20
Note: Arm is a registered trademark of Arm Limited (or its subsidiaries) in the US and/or elsewhere.
2.2 Compatible connectors for the Grove boards
Both Grove board connectors described in this section are 2.54 mm pitch 1×4-pin male connectors. Their Seeed
Studio™ part number is A2006LF-04A.
2.2.1 Compatible connector for UART Grove boards CN2
The CN2 connector is compatible with Grove-NFC boards using cable connection. Table 3 shows the definition of
the pins.
Table 3. Description of the UART Grove connector pins
STMod+ connector CN2 Grove function Pin number
STMod+#3-RX RX (Grove TX) 1
STMod+#2-TX TX (Grove RX) 2
- VCC 3
- GND 4
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Connectors
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2.2.2 Compatible connector for I2C Grove boards CN3
The CN3 connector is compatible with Grove-Barometer sensor (BMP180) or Grove-LCD RGB backlight boards
using cable connection. Table 4 shows the definition of the pins.
Table 4. Description of the I2C Grove connector pins
STMod+ connector CN3 Grove function Pin number
STMod+#7-SCL(1) SCL 1
STMod+#10-SDA(1) SDA 2
- VCC 3
- GND 4
1. The following limitations apply:
• For fan-out board versions MB1280A and MB1280B, the Grove connector does not support the 5 V I2C interface.
• The fan-out board version MB1280C can support the 5 V I2C interface for the Grove connector, but users must solder
the MOSFETs and related matched resistors by themselves.
2.3 ESP‑01 Wi‑Fi® board compatible connector CN4
The ESP‑01 Wi‑Fi® board connector is composed of 2×4-pin female connectors with a 2.54 mm pitch. Table 5
shows the definition of the pins.
Table 5. Description of the ESP‑01 Wi‑Fi® board connector pins
STMod+
connector CN11 ESP‑01 function Pin number Pin number ESP‑01 function STMod+
connector CN10
- GND 1 2 RXD (ESP-01
TXD) STMod+#3-RX
STMod+#14 GPIO2 3 4 CH_PD STMod+#13
STMod+#11 GPIO0 5 6 RST STMod+#12-RST
STMod+#2-TX TXD (ESP-01
RXD) 7 8 3V3 -
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ESP‑01 Wi‑Fi® board compatible connector CN4
UM2695 - Rev 1 page 5/12
2.4 Breadboard connectors CN9 and CN12
Both breadboard connectors are 2.54 mm pitch 1×10-pin connectors. Only the footprint pad is available on the
fan-out board for user development. Table 6 shows the definition of the pins.
Table 6. Description of the breadboard connector pins
Breadboard connector CN12 Pin number Pin number Breadboard connector CN9
STMod+#13-ADC 1 1 STMod+#14-PWM
STMod+#12-RST 2 2 STMod+#11-INT
STMod+#1-NSS/CTS 3 3 STMod+#3-MISOp/RX
STMod+#4-SCK/RTS 4 4 STMod+#2-MOSIp/TX
STMod+#9-MISOs 5 5 STMod+#7-SCL
STMod+#8-MOSIs 6 6 STMod+#10-SDA
5 V 7 7 5 V
GND 8 8 GND
STMod+#17 9 9 STMod+#19
STMod+#18 10 10 STMod+#20
2.5 mikroBUS™ compatible connectors CN10 and CN11
mikroBUS™ compatible connectors CN10 and CN11 are a pair of 1×8-pin female connectors with a 2.54 mm
pitch. Table 7 shows the definition of the pins.
Table 7. Description of the mikroBUS™ connector pins
STMod+
connector CN11
mikroBUS™
function Pin number Pin number mikroBUS™
function
STMod+
connector CN10
STMod+#13-ADC AN 1 1 PWM STMod+#14-PWM
STMod+#12-RST RST 2 2 INT STMod+#11-INT
STMod+#1-CS CS 3 3 RX STMod+#3-RX
STMod+#4-SCK SCK 4 4 TX STMod+#2-TX
STMod+#9-MISOs MISO 5 5 SCL STMod+#7-SCL
STMod+#8-MOSIs MOSI 6 6 SDA STMod+#10-SDA
- +3.3 V 7 7 +5 V -
- GND 8 8 GND -
The mikroBUS™ pinout assignment is available at the mikroe.com website.
UM2695
Breadboard connectors CN9 and CN12
UM2695 - Rev 1 page 6/12
2.6 Power selection jumper JP1
JP1 is a 3-pin jumper selector for 5 V or 3.3 V power switch. Table 8 shows the definition of the power selection.
Table 8. Description of the power selection
JP1 position VCC selection
1 2 3
VCC is connected to 5 V.
1 2 3
VCC is connected to 3.3 V.
UM2695
Power selection jumper JP1
UM2695 - Rev 1 page 7/12
Revision history
Table 9. Document revision history
Date Version Changes
20-Mar-2020 1 Initial release.
UM2695
UM2695 - Rev 1 page 8/12
Contents
1Hardware layout and configuration.................................................2
2Connectors........................................................................4
2.1 STMod+ male connector CN1 ....................................................4
2.2 Compatible connectors for the Grove boards .......................................4
2.2.1 Compatible connector for UART Grove boards CN2 ..............................4
2.2.2 Compatible connector for I2C Grove boards CN3 ................................5
2.3 ESP‑01 Wi‑Fi® board compatible connector CN4 ....................................5
2.4 Breadboard connectors CN9 and CN12............................................6
2.5 mikroBUS™ compatible connectors CN10 and CN11.................................6
2.6 Power selection jumper JP1 .....................................................7
Revision history ........................................................................8
Contents ...............................................................................9
List of tables ..........................................................................10
List of figures..........................................................................11
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Contents
UM2695 - Rev 1 page 9/12
List of tables
Table 1. Products featuring the fan-out board (MB1280) ...............................................1
Table 2. Description of the STMod+ connector pins ..................................................4
Table 3. Description of the UART Grove connector pins ...............................................4
Table 4. Description of the I2C Grove connector pins .................................................5
Table 5. Description of the ESP‑01 Wi‑Fi® board connector pins .........................................5
Table 6. Description of the breadboard connector pins ................................................6
Table 7. Description of the mikroBUS™ connector pins ................................................6
Table 8. Description of the power selection ........................................................7
Table 9. Document revision history ..............................................................8
UM2695
List of tables
UM2695 - Rev 1 page 10/12
Table of contents
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