SF32LB52-DevKit-ULP Development Board User Guide

(This development board is currently for internal testing and will be modified and improved before being released to the public)

Development Board Version Information:

  • V1.0.0: Uses the SF32LB52-MOD-1 module, current version

Development Board Overview

The LIT Huangshan is a development board based on the SF32LB52-MOD-1 module from Sichai Technology, and it also serves as a prototype for smart watches and bands. Developers can use this development board to design prototypes for smart watches and bands.

Feature List

This development board has the following features:

  1. Module: Equipped with the SF32LB52x-MOD-1-N16R8 module based on the SF32LB52x chip, with the following configuration:

    • Standard SF32LB525UC6 chip, with integrated configuration:

      • 8MB OPI-PSRAM, interface frequency 144MHz

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

    • 48MHz crystal

    • 32.768KHz crystal

    • On-board PCB antenna

  2. Display

    • AMOLED screen, model: ZC-A1D85W-010

    • 1.85 inches

    • 390*450

    • 800 cd/m2

    • Quad SPI display interface

    • OLED Driver IC: CO5300AF-01

    • Power IC: BV6802W

    • TP IC: FT6146-M00

  3. Dedicated Screen Interface

    • SPI/DSPI/Quad SPI, supports DDR mode QSPI, exposed through a 22-pin FPC and a 40-pin header

    • Supports I2C interface touch screen

  4. Audio

    • On-board integrated Mems MIC

    • Analog audio output, on-board Class-D audio PA

    • External GH-1.25mm connector for 3W/4Ω or 2W/8Ω speaker

  5. USB

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

    • USB interface, supports USB2.0 FS, exposed through a 30-pin header

  6. SD Card

    • Supports SPI interface TF card, on-board Micro SD card slot

  7. Buttons

    • 1x function button

    • 1x power button, supports long press 10s reset function

  8. RGB-LED

    • 1x RGB-LED, SK6812MINI-HS, GPIO controlled

  9. Motor

    • On-board motor driver circuit, reserved external motor soldering points

  10. Sensors

    • Six-axis IMU-Inertial Measurement Unit, LSM6DS3TR-C

    • Three-axis geomagnetic sensor, MMC5603NJ

    • Ambient light sensor, LTR-303ALS-01

  11. Power

    • OVP, SY5320

    • Charger, SY6103

    • Loadswitch, LP5240HVF

    • LDO, ETA5055V330DS2F

    • Supports external GH1.25mm positive sequence connector for lithium battery, maximum charging voltage 4.5V, maximum charging current 500mA

  12. 30-pin Function Expansion Interface

    • 2x15-pin, 1.27mm pitch header

    • Expands GPIO

    • Supports power consumption testing

Functional Block Diagram

../../_images/HSP_Block_Diagram.svg
Functional block diagram of the development board



Component Introduction

The SF32LB52 Huangshan development board includes:

- Core board 
- Screen board 
- Battery 
- Speaker
../../_images/HSP_Core_T_Notes.svg
Front view of the core board (click to enlarge)



../../_images/HSP_Core_B_Notes.svg
Back view of the core board (click to enlarge)



../../_images/HSP_LCM_B_Notes.svg
Back view of the screen board (click to enlarge)



../../_images/HSP_Core_T_Jumper.svg
Core board jumper cap and test point description (click to enlarge)



Application Development

This section mainly introduces the methods for setting up hardware and software, as well as how to flash firmware to the development board and develop applications.

Required Hardware

  • 1 x SF32LB52 Huangshan (with SF32LB52X-MOD-1-N16R8 module)

  • 1 x USB2.0 data cable (Standard A to Type-C)

  • 1 x Computer (Windows, Linux, or macOS)

Note

  1. If you need to use both UART debugging and the USB interface, you will need two USB2.0 data cables;

  2. Ensure you use an appropriate USB data cable, as some cables are only suitable for charging and cannot be used for data transmission or firmware flashing.

Optional Hardware

  • 1x Speaker

  • 1x TF Card

  • 1x Lithium battery greater than 450mAh

Hardware Setup

Prepare the development board and load the first example application:

  1. Open the SifliTrace tool software from Sichai, and select the correct COM port;

  2. Insert the USB data cable, connecting the PC to the USB to UART port of the development board;

  3. The LCD screen will light up, and you can interact with the touch screen using your fingers.

Hardware setup is complete, and you can now proceed to the software setup.

Software Setup

For a quick setup of the development environment, please refer to the relevant software documentation.

Hardware Reference

This section provides more information about the development board hardware.

GPIO Allocation List

The table below lists the GPIO allocations for the SF32LB52-MOD-1-N16R8 module pins, used to control specific components or functions of the development board.

Signal definition table

Pin

Pin Name

Function

1

GND

Ground

2

PA_44

VBUS_DET, charger insertion detection

3

PA_43

KEY2

4

PA_42

Audio_PA_EN

5

PA_23

XTAL32K_XO, default NC

6

PA_22

XTAL32K_XI, default NC

7

PA_41

Touchscreen interrupt INT

8

PA_40

Sensor I2C1_SCL

9

PA_39

Sensor I2C1_SDA

10

PA_38

VSYS to VSYS_1 switch control

11

PA_37

Touchscreen I2C_SCL

12

PA_36

USB_DM

13

PA_35

USB_DP

14

PA_34

HOME and long press reset button

15

PA_33

Touchscreen I2C_SDA

16

PA_32

RGB LED

17

VDD33_VOUT2

3.3V power output

18

PA_24

SPI1_DIO, SD card interface signal

19

PA_25

SPI1_DI, SD card interface signal

20

PA_26

VSYS_1 to VCC33 switch control

21

PA_27

SD card_CD signal

22

PA_28

SPI1_CLK, SD card interface signal

23

PA_29

SPI1_CS, SD card interface signal

24

PA_30

VSYS_1 to HR3V3 switch control

25

PA_31

Sensor INT1

26

GND

Ground

27

VBAT

3.7~4.7V power input

28

PA_20

Vibrator PWM

29

PA_19

DB_UART_TXD, program download and software debugging interface

30

PA_18

DB_UART_RXD, program download and software debugging interface

31

PA_11

Charger I2C0_SDA

32

PA_10

Charger I2C0_SCL

33

AU_DAC1P_OUT

Analog audio output signal

34

AU_DAC1N_OUT

Analog audio output signal

35

GND

Ground

36

MIC_BIAS

MIC bias voltage

37

MIC_ADC_IN

MIC input signal

38

PA_09

Touchscreen interrupt RST

39

PA_08

QSPI D3, LCD interface signal

40

PA_07

QSPI D2, LCD interface signal

41

PA_06

QSPI D1, E-Paper DC, LCD interface signal

42

PA_05

QSPI D0, E-Paper SDI, LCD interface signal

43

PA_04

QSPI CLK, E-Paper SCLK, LCD interface signal

44

PA_03

QSPI CS, E-Paper CS, LCD interface signal

45

PA_02

QSPI TE, E-Paper BUSY, LCD interface signal

46

PA_01

BL PWM, LCD interface signal

47

PA_00

RSTB, LCD interface signal

48

GND

Ground

49

GND

Ground

50

GND

Ground

51

GND

Ground

52

GND

Ground

53

GND

Ground

54

GND

Ground

55

GND

Ground

56

GND

Ground

57

GND

Ground

58

GND

Ground

58

GND

Ground

60

GND

Ground

61

VBATS

Battery voltage detection input

62

NC

NC

63

PA_15

MPI2_D0, SD1_CMD

64

PA_16

MPI2_CLK, SD1_D0

65

PA_17

MPI2_D3, SD1_D1

66

PA_14

MPI2_D2, SD1_CLK

67

PA_13

MPI2_D1, SD1_D3

68

PA_12

MPI2_CS, SD1_D2

Important

  1. The SF32LB52-DevKit-ULP is compatible with the SF32LB-MOD-1 module.

  2. Pin 17 VDD33_VOUT of the module is a 3.3V power output, which is disabled by default and requires software to enable the internal LDO.

  3. Pin 27 VBAT of the module is a power input pin that can be directly connected to a lithium battery. When not using battery power and switching to constant voltage power, the input range is 3.7V~4.7V, with a recommended connection of 3.8V.

  4. The power-on threshold for VBAT of the SF32LB-MOD-1-N16R8 module is set to 3.58V, and the power-off threshold is set to 3.48V.

  5. Pins 62~68 of the SF32LB-MOD-1-N16R8 module are connected to the internal Nor Flash by default and cannot be used on the development board; if you need to use the SDIO interface, choose a module without the flash.

30P Pin Header Interface Definition

30p Pin Header Interface Definition

Pin

Pin Name

Function

1

USB_VBUS_5V

USB TypeC VBUS

2

USB_VBUS_5V

USB TypeC VBUS

3

GND

Ground

4

GND

Ground

5

VBAT_S

VBAT power output, needs to be shorted to VBAT

6

VBAT

VBAT power input, needs to be shorted to VBAT_S

7

VSYS_S

VSYS power output, needs to be shorted to VSYS

8

VSYS

VSYS power input, needs to be shorted to VSYS_S

9

GND

Ground

10

GND

Ground

11

VCC_3V3_S

VCC_3V3 power output, needs to be shorted to VCC_3V3

12

VCC_3V3

VCC_3V3 power input, needs to be shorted to VCC_3V3_S

13

PA_36

Default USB_DM

14

PB_39

Default I2C1_SDA

15

PA_35

Default USB_DP

16

PA_40

Default I2C1_SCL

17

PA_32

Default RGN-LED data, can be used as GPIO

18

PA_30

Default Sensor power control, using as GPIO will affect PA39 and PA40

19

PA_29

Default SPI1_CS, can be used as GPIO, the TF card on the core board cannot be inserted when extended

20

PA_24

Default SPI1_DO, can be used as GPIO, the TF card on the core board cannot be inserted when extended

21

PA_28

Default SPI1_CLK, can be used as GPIO, the TF card on the core board cannot be inserted when extended

22

PA_25

Default SPI1_DI, can be used as GPIO, the TF card on the core board cannot be inserted when extended

23

PA_27

Default SD_DET, can be used as GPIO, the TF card on the core board cannot be inserted when extended

24

PA_20

Default VIB PWM, can be used as GPIO, the motor on the core board cannot be soldered when extended

25

PA_19

Debug UART_TXD

26

PA_34

KEY1, for power on/off and long press 10s reset

27

PA_18

Debug UART_RXD

28

PA_43

KEY2, function button

29

PA_11

Default I2C0_SDA

30

PA_10

Default I2C0_SCL

Important

  1. Pins 1 and 2 of the 30p header are connected to the VBUS input of USB-TypeC. When the development board is connected to a USB cable, these pins can serve as 5V output; when the development board is not connected to a USB cable, these pins can serve as 5V input.

  2. Pin 5 of the 30p header is connected to the battery holder on the development board and is not connected to the downstream. During operation, a jumper cap is needed to short VBAT_S and VBAT.

  3. Pin 6 of the 30p header is connected to the VBAT pin of the charging IC on the development board and the VBAT_S pin of the module. VBAT_S and VBAT are disconnected here to facilitate the insertion of an ammeter for power consumption testing.

  4. Pin 7 of the 30p header is connected to the VSYS pin of the charging IC on the development board and is not connected to the downstream. During operation, a jumper cap is needed to short VSYS_S and VSYS.

  5. Pin 8 of the 30p header is connected to the VSYS pin of the module and other VSYS input pins. VSYS_S and VSYS are disconnected here to facilitate the insertion of an ammeter for power consumption testing.

  6. Pin 11 of the 30p header is connected to the LDO output pin of the VCC_3V3 conversion from VSYS_1 on the development board and is not connected to the downstream. During operation, a jumper cap is needed to short VCC_3V3_S and VCC_3V3.

  7. Pin 12 of the 30p header is connected to the main VCC_3V3 power on the development board. VSYS_S and VSYS are disconnected here to facilitate the insertion of an ammeter for power consumption testing.

22p QSPI Line Order FPC Interface Definition

22p FPC Interface Signal Definition

Pin

Pin Name

Function

1

VBAT

VBAT power output

2

PA_01

BL_PWM signal (used with TFT screen)

3

PA_07

QSPI D2, LCD interface signal

4

PA_08

QSPI D3, LCD interface signal

5

NC

NC

6

NC

NC

7

NC

NC

8

NC

NC

9

NC

NC

10

NC

NC

11

PA_02

QSPI TE, LCD interface signal

12

PA_00

LCD Reset, LCD interface signal

13

PA_04

QSPI CLK, SPI CLK, LCD interface signal

14

PB_05

QSPI D0, SPI SDI, LCD interface signal

15

PA_03

QSPI CS, SPI CS, LCD interface signal

16

PA_06

QSPI D1, SPI DC, LCD interface signal

17

VDD_3V3

3.3V power output

18

PA_41

Touchscreen INT interrupt signal

19

PA_33

Touchscreen I2C_SDA signal

20

PA_37

Touchscreen I2C_SCL signal

21

PA_09

Touchscreen RTN reset signal

22

GND

Ground

Power Supply Description

The SF32LB52 Huangshan Development Board has two power supply methods: USB Type-C and battery power.

  1. The USB Type-C port on the board can power the board.

  2. The board can be powered by a battery alone, which is convenient for independent operation without a computer.

Hardware Configuration Options

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

  1. Download Mode

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

  1. Software Development Mode

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

  1. Reset

  • The module can be reset by pulling the RTS# pin of the CH340N low and then high.

For more details, please refer to  Firmware Burn Tool Impeller

Battery Charging and Selection

The SF32LB52 Huangshan Development Board integrates the SY6103 linear charging chip, which supports a maximum charging current of 500mA, with a default setting of 450mA constant current.

It is recommended to use a 450mAh to 500mAh single-cell polymer lithium battery. The battery connector is a GH-1.25mm female socket with positive polarity. Please refer to the battery socket silkscreen on the development board for polarity.

LCD Display Interface

The SF32LB52 Huangshan core board supports QSPI interface LCD screens. The connector is a 22p-0.5pitch FPC, with dual contact points on the top and bottom. Please refer to the signal definitions above. If the signal lines are different, a conversion board is required for testing. Please refer to the SF32LB52-DevKit-LCD Adapter Board Manufacturing Guide.

Audio Interface

The SF32LB52 Huangshan core board integrates a MEMS MIC and an audio amplifier chip.

  • It supports audio signal input from the onboard mic.

  • It supports external speakers (up to 3W/4 ohms), with the speaker connector being a GH-1.25mm female socket.

Sample Acquisition

Retail samples and small batches can be purchased directly from Taobao. Bulk customers can send an email to sales@sifli.com or contact customer service on Taobao to obtain sales contact information. Open source contributors can apply for free samples by joining QQ group 674699679 for communication.