SF32LB52-DevKit-Nano Development Board User Guide

Development board version information:

  • *-N4-V1.0.0: Configured with the SF32LB52BU56 chip (internally co-packaged with 4 MB NOR Flash). Current version.

  • *-R16N16-V1.0.0: Configured with SF32LB52JUD6 (internally co-packaged with 16 MB PSRAM) + 16 MB NOR Flash. Current version.

1. Development Board Overview

SF32LB52-DevKit-Nano is a development board based on SiFli Technology’s SF32LB52BU56/SF32LB52JUD6 chips. It measures only 21 mm x 51 mm and uses a castellated-hole design along the board edges, making it convenient for developers to use in different scenarios. The development board supports GPIO, UART, I2C, SPI, LCD, I2S, GPADC, PWM, and analog audio input/output.

../../_images/Nano_Front_look.png
Front Photo of the Development Board



../../_images/Nano_Back_look.png
Rear Photo of the Development Board



2. Feature List

This development board has the following features:

  1. Board type:

    • -N4: Onboard SF32LB52BU56 chip, configured as follows:

      • Co-packaged configuration:

        • 4 MB NOR Flash, interface frequency 96 MHz

    • -R16N16: Onboard SF32LB52JUD6 chip, configured as follows:

      • Co-packaged configuration:

        • 16 MB OPI-PSRAM, interface frequency 144 MHz

      • Onboard 128 Mb QSPI-NOR Flash, interface frequency 72 MHz, STR mode

  2. Crystal

    • 48 MHz crystal

    • 32.768 kHz crystal

  3. Antenna

    • Onboard PCBA antenna

  4. GPIO

    • LCC castellated holes support 17 GPIOs

    • LGA pins support 13 GPIOs

  5. UART-I2C-GPTIM

    • 3x UART

    • 4x I2C

    • 2x GPTIM

    • All GPIOs can be configured for UART, I2C, and GPTIM

  6. SPI

    • 2x SPI

  7. GPADC

    • 3x GPADC

  8. Display

    • FPC16P, 0.5 mm-pitch connector for display expansion

    • SPI/DSPI/Quad SPI, supports DDR-mode QSPI display interface

    • Supports touchscreens with an I2C interface

    • Supports the Huangshan Pi 1.85-inch AMOLED display through a 16p-to-22p flat cable

  9. Audio

    • Supports audio ADC input and can connect to an analog microphone or silicon microphone

    • Supports PDM digital microphone input

    • Analog audio output requires an external Class-AB/D audio PA to drive the speaker

    • All interfaces are routed out through LCC castellated holes

  10. USB

    • Type-C-UART interface, with onboard CH340N serial chip for firmware flashing and software debugging, and can supply power

    • USB interface, supports USB 2.0 FS and is routed out through LCC castellated holes

  11. Buttons - 1x Function Buttons - 1x Power Buttons, supports reset by long-pressing for 10s

  12. LED - 2x LEDs, GPIO-controlled

  13. Power

    • Powered through the USB Type-C interface

    • Onboard LDO chip for converting VBUS 5 V to 3.3 V

    • Onboard power switch, with enable controlled through the RTS# pin of the CH340N to implement MCU reset

3. Pin Definition

../../_images/SF32LB52-DevKit-Nano-T-pinout.svg
Front Pinout of the Development Board (click to enlarge)



../../_images/SF32LB52-DevKit-Nano-B-pinout.svg
Rear PinOut of the Development Board (click to enlarge)



Detailed Pin Description

The following table provides detailed descriptions of the pins on the SF32LB52-DevKit-Nano development board.

LEFT LCC (J1) Pin Description Table

Pin

Pin Name

Reset Default and Multiplexed Functions

Pull-up/Pull-down

1

GND

Ground

2

DACP

Analog Audio output signal

3

DACN

Analog Audio output signal

4

MIC_ADC

MIC input signal

5

MIC_BIAS

MIC bias voltage

6

PA30

PA30, UART, I2C, GPTIM, I2S1_LRCK, and GPADC2

PD

7

GND

Ground

8

PA19

UART0_TXD, debug and download port, PA19, SWCLK, I2C, GPTIM

None

9

PA18

UART0_RXD, debug and download port, PA18, SWDIO, I2C, GPTIM

PU

10

PA29

PA29, UART, I2C, GPTIM, SPI1_CS, I2S1_BCK, and GPADC1

PD

11

PA28

PA28, UART, I2C, GPTIM, SPI1_CLK, I2S1_SDI, and GPADC0

PD

12

PA25

PA25, UART, I2C, GPTIM, SPI1_DI, I2S1_SDO, and WKUP1

PD

13

3.3V

3.3VPower. When USB TypeC is not plugged in, it can be used as a 3.3V input; when USB TypeC is plugged in, it can be used as a 3.3V output

14

GND

Ground

15

PA24

PA24, UART, I2C, GPTIM, SPI1_DIO, I2S1_MCLK, and WKUP0

PD

16

5V

5VPower. When USB TypeC is not plugged in, it can be used as a 5V input; when USB TypeC is plugged in, it can be used as a 5V output

RIGHT LCC (J2) Pin Description Table

Pin

Pin Name

Reset Default and Multiplexed Functions

Pull-up/Pull-down

1

GND

Ground

2

3.3V

3.3VPower. When USB TypeC is not plugged in, it can be used as a 3.3V input; when USB TypeC is plugged in, it can be used as a 3.3V output

3

PA39

PA39, UART, I2C, GPTIM, SPI2_CLK, and WKUP15

PU

4

PA37

PA37, UART, I2C, GPTIM, SPI2_DIO, and WKUP13

PD

5

PA38

PA38, UART, I2C, GPTIM, SPI2_DI, and WKUP14

PD

6

PA41

PA41, UART, I2C, GPTIM, and WKUP17

PU

7

PA40

PA40, UART, I2C, GPTIM, SPI2_CS, and WKUP16

PU

8

PA42

PA42, UART, I2C, GPTIM, and WKUP18

PU

9

GND

Ground

10

3.3V

3.3VPower. When USB TypeC is not plugged in, it can be used as a 3.3V input; when USB TypeC is plugged in, it can be used as a 3.3V output

11

PA43

PA43, UART, I2C, GPTIM, and WKUP19

PD

12

PA44

PA44, UART, I2C, GPTIM, and WKUP20

PD

13

PA35

PA35, UART, I2C, GPTIM, USB_DP, and WKUP11

PD

14

PA36

PA36, UART, I2C, GPTIM, USB_DM, and WKUP12

PD

15

5V

5VPower. When USB TypeC is not plugged in, it can be used as a 5V input; when USB TypeC is plugged in, it can be used as a 5V output

16

GND

Ground

16-pin QSPI FPC Interface Pinout Definition

16p FPC Connector Signal Definition

Pin

Pin Name

Reset Default and Multiplexed Functions

Pull-up/Pull-down

1

GND

Ground

2

PA_00

PA00, UART, I2C, GPTIM, and LCD_RST

PD

3

PA_01

PA01, UART, I2C, GPTIM, and BL_PWM

PD

4

PA_02

PA02, UART, I2C, GPTIM, LCD_TE, and I2S1_MCLK

PD

5

PA_03

PA03, UART, I2C, GPTIM, LCD_CS, and I2S1_SDO

PU

6

PA_04

PA04, UART, I2C, GPTIM, LCD_CLK, and I2S1_SDI

PD

7

PA_05

PA05, UART, I2C, GPTIM, LCD_D0, and I2S1_BCK

PD

8

PA_06

PA06, UART, I2C, GPTIM, LCD_D1, and I2S1_LRCK

PD

9

PA_07

PA07, UART, I2C, GPTIM, LCD_D2, and PDM1_CLK

PD

10

PA_08

PA08, UART, I2C, GPTIM, LCD_D3, and PDM1_DAT

PD

11

3.3V

3.3V Power output

12

GND

Ground

13

PA_09

PA09, UART, I2C, GPTIM, and CTP_INT

PD

14

PA_11

PA11, UART, I2C, GPTIM, and CTP_SDA

PU

15

PA_20

PA20, UART, I2C, GPTIM, and CTP_SCL

PD

16

PA_10

PA10, UART, I2C, GPTIM, and CTP_RST

PD

4. Feature Introduction

Power Supply Description

The development board supports the following three power supply methods:

  • Powered through the USB Type-C interface (default)

  • Power supply via 5V and GND pin headers

  • Power supply via 3.3V and GND pin headers

Recommended power supply method during debugging: power supply via the USB Type-C connector.

LED Control

The development board has two onboard LEDs. Developers can refer to the table below to control the corresponding pins.

LED Signal Control Table

LED No.

Corresponding GPIO

Description

LED1

PA31

On at low level

LED2

PA32

On at low level

External Flash

The development board has one onboard flash device (depending on the board type, it may or may not be soldered). Supported types:

  • SPI NOR Flash, WSON8-8x6mm or WSON8-6x5mm

  • SPI NAND Flash, WSON8-8x6mm

  • SD NAND Flash, WSON8-8x6mm

Flash Signal Definitions

Pin

Pin Name

Reset Default and Multiplexed Functions

Pull-up/Pull-down

1

PA_12

PA12, UART, I2C, GPTIM, MPI2_CS, and SD1_D2

PU

2

PA_13

PA13, UART, I2C, GPTIM, MPI2_D1, and SD1_D3

PD

3

PA_14

PA14, UART, I2C, GPTIM, MPI2_D2, and SD1_CLK

PD

4

PA_15

PA15, UART, I2C, GPTIM, MPI2_D0, and SD1_CMD

PD

5

PA_16

PA16, UART, I2C, GPTIM, MPI2_CLK, and SD1_D0

PD

6

PA_17

PA17, UART, I2C, GPTIM, MPI2_D3, and SD1_D1

PD
Board Type and Flash Information Mapping Table

Development Board Model

MCU Co-packaged Specification

On-board Specification

SF32LB52-DevKit-Nano-N4

4MB SPI NOR Flash

None

SF32LB52-DevKit-Nano-R16N16

16MB OPI PSRAM

16MB SPI NOR Flash

Buttons

The development board has two onboard buttons whose functions must be defined in software. KEY1 supports hardware reset by pressing and holding for 10 seconds. Developers can refer to the table below to control the corresponding pins.

Buttons Signal Control Table

Buttons No.

Corresponding GPIO

Description

KEY1

PA34

Active high; supports reset by long-pressing for 10 seconds

KEY2

PA33

Active high

Flashing and Debugging

Connect a USB cable to the USB-to-UART port, open SiFli Technology’s firmware flashing tool, and select the corresponding COM port and firmware.

  1. Download Mode

    • Check the BOOT option and power on. After startup, the board enters download mode, and firmware flashing can be completed.

  2. Software Development Mode

    • Clear the BOOT option and power on. After startup, the board enters serial port log output mode, which is software debugging mode.

  3. Development Board Reset

    • Reset the MCU by controlling the RTS# pin of the CH340N through the PC tool.

For details, refer to Firmware Flashing Tool Impeller

Note

Some development boards, such as Huangshan Pi and SF32LB52-DevKit-Nano-N16R16, reset through the RTS pin of the onboard USB-to-UART chip. This is mainly intended to make board reset easier. The newer SifliTrace tool already supports RTS reset.

Q: This design can cause an inconvenience: after the board is powered on again, the first serial-port connection made by a tool may trigger a board reset. In some cases, opening the serial port during use may power off the board.

A: Disable hardware flow control to resolve this issue. Open Device Manager -> right-click the port and select Properties -> Port Settings (Advanced) -> select Disable modem control.

image

LCD Display Interface

The development board supports QSPI-interface LCD screens. The connector is a vertical 16p-0.5pitch FPC, flip-up, bottom-contact type. Refer to the signal pin sequence defined above. If the pin sequence differs, use an adapter board for testing; see the SF32LB52-DevKit-LCD Adapter Board Fabrication Guide.

The Huangshan Pi display can be connected directly using an FPC-22p to 16p flexible flat cable.

../../_images/22p-to-16p.png
FPC Adapter Flex Cable



Reference

Audio Expansion

The development board requires an external microphone and a differential audio power amplifier.

PCB Component Location Lookup

SF32LB52-DevKit-Nano-PCB

5. Obtaining Samples

Retail samples and small batches can be purchased directly from Taobao. Volume customers can email sales@sifli.com or contact customer service on Taobao for sales contact information. Open-source contributors may apply for free samples and can join QQ group 674699679 for discussion.