SF32LB52-DevKit-Nano Development Board User Guide

Development Board Version Information:

  • *-N4-V1.0.0: Configured with SF32LB52BU56 chip (4MB internal NOR Flash), current version

  • *-R16N16-V1.0.0: Configured with SF32LB52JUD6 chip (16MB internal PSRAM) + 16MB NOR Flash, current version

1. Development Board Overview

The SF32LB52-DevKit-Nano is a development board based on the SiChes Technology SF32LB52BU56/SF32LB52JUD6 chips, with dimensions of only 21mm*51mm. The board edge is designed with邮票孔 (postage stamp holes), making it convenient for developers to use in various scenarios. The development board supports GPIO, UART, I2C, SPI, LCD, I2S, GPADC, PWM, and analog audio input/output.

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



../../_images/Nano_Back_look.png
Back View of the Development Board



2. Feature List

This development board has the following features:

  1. Board Type:

    • -N4: Equipped with the SF32LB52BU56 chip, configured as follows:

      • Integrated configuration:

        • 4MB NOR Flash, interface frequency 96MHz

    • -R16N16: Equipped with the SF32LB52JUD6 chip, configured as follows:

      • Integrated configuration:

        • 16MB OPI-PSRAM, interface frequency 144MHz

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

  2. Crystals

    • 48MHz crystal

    • 32.768KHz crystal

  3. Antenna

    • Equipped with a PCBA antenna

  4. GPIO

    • LCC half-hole supports 17 GPIOs

    • LGA pins support 13 GPIOs

  5. UART-I2C-GPTIM

    • 3x UART

    • 4x I2C

    • 2x GPTIM

    • All GPIOs support configuration as UART, I2C, and GPTIM

  6. SPI

    • 2x SPI

  7. GPADC

    • 3x GPADC

  8. Display

    • FPC16P, 0.5mm pitch connector for display expansion

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

    • Supports I2C interface touch screen

    • Supports 1.85 inch AMOLED screen via 16p to 22p ribbon cable

  9. Audio

    • Supports audio ADC input, can connect to analog or silicon microphones

    • Supports PDM digital microphone input

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

    • All interfaces are exposed through LCC half-holes

  10. USB

    • Type C-UART interface, equipped with CH340N serial chip, for program download and software debugging, can supply power

    • USB interface, supports USB2.0 FS, exposed through LCC half-holes

  11. Buttons

    • 1x Function button

    • 1x Power button, supports long press (10s) reset function

  12. LEDs

    • 2x LEDs, GPIO controlled

  13. Power

    • Powered via USB Type-C interface

    • Equipped with VBUS 5V to 3.3V LDO chip

    • Equipped with power switch, can be controlled by the RTS# pin of CH340N to reset the MCU

3. Pinout Definition

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



../../_images/SF32LB52-DevKit-Nano-B-pinout.svg
Back Pinout of the Development Board (Click to Enlarge)



Detailed Pin Description

The table below provides a detailed description of the SF32LB52-DevKit-Nano development board pins.

LEFT LCC (J1) Pin Description Table

Pin

Pin Name

Reset Default and Alternate 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

3.3V power supply, can be used as 3.3V input when USB TypeC is not inserted; can be used as 3.3V output when USB TypeC is inserted

14

GND

Ground

15

PA24

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

PD

16

5V

5V power supply, can be used as 5V input when USB TypeC is not inserted; can be used as 5V output when USB TypeC is inserted

RIGHT LCC (J2) Pin Description Table

Pin

Pin Name

Reset Default and Alternate Functions

Pull-up/Pull-down

1

GND

Ground

2

3.3V

3.3V power supply, can be used as 3.3V input when USB TypeC is not inserted; can be used as 3.3V output when USB TypeC is inserted

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

3.3V power supply, can be used as 3.3V input when USB TypeC is not inserted; can be used as 3.3V output when USB TypeC is inserted

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

5V power supply, can be used as 5V input when USB TypeC is not inserted; can be used as 5V output when USB TypeC is inserted

16

GND

Ground

16p QSPI Line Sequence FPC Interface Definition

16p FPC Interface Signal Definition

Pin

Pin Name

Reset Default and Alternate 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. Function Introduction

Power Supply Description

The development board supports the following 3 power supply methods:

  • USB Type-C interface power supply (default)

  • 5V and GND pin power supply

  • 3.3V and GND pin power supply

The recommended power supply method during debugging: USB Type-C interface power supply.

LED Control

The development board has 2 LEDs. Developers can refer to the following table for controlling the corresponding pins.

LED Signal Control Table

LED Number

Corresponding GPIO

Description

LED1

PA31

Low level to light up

LED2

PA32

Low level to light up

External Flash

The development board is equipped with a Flash (depending on the board model, some are soldered, some are not), supporting the following types:

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

  • SPI NAND Flash, WSON8-8x6mm

  • SD NAND Flash, WSON8-8x6mm

Flash Signal Definition

Pin

Pin Name

Reset Default and Alternate 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 Model and Flash Information Correspondence Table

Board Model

MCU Package 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 2 buttons that require software-defined functions. KEY1 supports hardware long-press reset for 10 seconds. Developers can refer to the following table for controlling the corresponding pins.

Button Signal Control Table

Button Number

Corresponding GPIO

Description

KEY1

PA34

High level active, supports long-press reset for 10 seconds

KEY2

PA33

High level active

Download and Debugging

Connect the USB-to-UART port with a USB cable, open the firmware download tool from Sicheng Technology, and select the corresponding COM port and program.

  1. Download Mode

    • Check the BOOT option, power on, and enter the download mode after booting to complete the program download.

  2. Software Development Mode

    • Uncheck the BOOT option, power on, and enter the serial log print mode after booting to enter the software debugging mode.

  3. Board Reset

    • Reset the MCU through the RTS# pin of the CH340N controlled by the host computer tool.

For more details, please refer to Firmware Burn Tool Impeller

LCD Display Interface

The development board supports QSPI interface LCD screens, with a vertical 16p-0.5pitch FPC connector that flips up and down to make contact. Please refer to the signal line sequence defined above. If the line sequence is different, a transition board is required for testing. Please refer to the SF32LB52-DevKit-LCD Transition Board Manufacturing Guide.

The screen for the Huángshān series can be directly connected using a 22p to 16p ribbon cable.

../../_images/22p-to-16p.png
FPC Transition Ribbon Cable



Reference Materials

Audio Expansion

The development board requires external microphones and differential audio amplifiers.

PCB Component Location Query

SF32LB52-DevKit-Nano-PCB

5. Sample Acquisition

Retail samples and small batches can be purchased directly from Taobao. For bulk orders, please email sales@sifli.com or contact customer service on Taobao to obtain sales contact information. Participating in open-source projects can allow you to apply for free samples. You can join QQ group 674699679 for communication.