Lichuang Huangshan Pi Development Board User Guide

(This development board is currently available for internal trial use and will be released externally after future modifications and improvements.)

Development board version information:

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

Development Board Overview

Lichuang Huangshan Pi is a development board based on the SiFli Technology SF32LB52-MOD-1 module, and is also a prototype for smart watches and fitness bands. Developers can use this development board for prototyping smart watches and fitness bands.

Feature List

This development board has the following features:

  1. Module: onboard SF32LB52x-MOD-1-N16R8 module based on the SF32LB52x chip, configured as follows:

    • Standard SF32LB525UC6 chip, with the following built-in co-packaged configuration:

      • 8MB OPI-PSRAM, interface frequency 144MHz

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

    • 48 MHz crystal

    • 32.768 kHz crystal

    • Onboard PCBA antenna

  2. Display

    • AMOLED display, model: ZC-A1D85W-010

    • 1.85-inch

    • 390*450

    • 800 cd/m2

    • Quad SPI display interface

    • OLED Driver IC: CO5300AF-01

    • Power IC: BV6802W

    • TP IC: FT6146-M00

  3. Dedicated display interface

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

    • Supports touchscreens with an I2C interface

  4. Audio

    • Onboard integrated MEMS MIC

    • Analog audio output, onboard Class-D audio PA

    • External 3 W/4 ohm or 2 W/8 ohm speaker with a GH-1.25 mm interface

  5. 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, routed out through the 30p interface

  6. SD Card

    • Supports TF cards using the SPI interface, with an onboard Micro SD card slot

  7. Buttons

    • 1x function button

    • 1x power button, supports reset by pressing and holding for 10 s

  8. RGB-LED

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

  9. Motor

    • Onboard motor driver circuit, with reserved solder pads for an external motor

  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 an external lithium battery with a GH1.25 mm forward-pinout interface, maximum charging voltage 4.5 V, maximum charging current 500 mA

  12. 30p function expansion interface

    • 2x15p, 1.27 mm pitch pin header

    • Expansion GPIO

    • Supports power consumption testing

Functional Block Diagram

../../_images/HSP_Block_Diagram.svg
Development Board Functional Block Diagram



Component Introduction

The SF32LB52 Huangshan Pi development board includes:

- Core board 
- Display board 
- Battery 
- Speaker
../../_images/HSP_Core_T_Notes.svg
Front of the Core Board (click to enlarge)



../../_images/HSP_Core_B_Notes.svg
Rear of the Core Board (click to enlarge)



../../_images/HSP_LCM_B_Notes.svg
Rear of the Display Board (click to enlarge)



../../_images/HSP_Core_T_Jumper.svg
Description of Core Board Jumper Caps and Test Points (click to enlarge)



Application Development

This section mainly describes how to set up the hardware and software, flash firmware to the development board, and develop applications.

Required Hardware

  • 1 x SF32LB52 Huangshan Pi (including the SF32LB52X-MOD-1-N16R8 module)

  • 1 x USB 2.0 data cable (standard Type-A to Type-C)

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

Note

  1. If you need both UART debugging and the USB interface, two USB 2.0 data cables are required;

  2. Make sure to use an appropriate USB data cable. Some cables are for charging only and cannot be used for data transfer or firmware flashing.

Optional Hardware

  • 1x speaker

  • 1x TF Card

  • 1x lithium battery greater than 450 mAh

Hardware Setup

Prepare the development board and load the first sample application:

  1. Open SiFli’s SifliTrace tool software and select the correct COM port;

  2. Plug in the USB data cable to connect the PC to the USB-to-UART port on the development board;

  3. The LCD display lights up, and you can interact with the touchscreen using your finger.

Hardware setup is complete. You can now proceed with software setup.

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

Software Setup

For instructions on quickly setting up the development environment, refer to the software documentation.

Hardware Reference

This section provides more information about the development board hardware.

GPIO Assignment List

The table below lists the GPIO assignments for the pins of the SF32LB52-MOD-1-N16R8 module, used to control specific components or functions on 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

SensorsI2C1_SCL

9

PA_39

SensorsI2C1_SDA

10

PA_38

VSYS to VSYS_1 switching control

11

PA_37

Touchscreen I2C_SCL

12

PA_36

USB_DM

13

PA_35

USB_DP

14

PA_34

HOME and long-press ResetButtons

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 switching 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 switching control

25

PA_31

SensorsINT1

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 debug interface

30

PA_18

DB_UART_RXD, program download and software debug 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. SF32LB52-DevKit-ULP is compatible with the SF32LB-MOD-1 module.

  2. Pin 17 VDD33_VOUT of the module is a 3.3 V power output. It has no output by default; software must enable the internal LDO.

  3. Pin 27 VBAT of the module is a power input pin and can be connected directly to a lithium battery. When battery power is not used and a constant-voltage supply is used instead, the input range is 3.7 V to 4.7 V; 3.8 V is recommended.

  4. For the SF32LB-MOD-1-N16R8 module, the VBAT power-on threshold is set by software to 3.58 V, and the power-off threshold is set by software to 3.48 V.

  5. Pins 62 to 68 of the SF32LB-MOD-1-N16R8 module are connected to the module’s internal NOR Flash by default and cannot be used by the development board. To use the SDIO interface, select a module version without 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

VBATPower output, must be shorted to the VBAT pin

6

VBAT

VBATPower input, must be shorted to the VBAT_S pin

7

VSYS_S

VSYSPower output, must be shorted to the VSYS pin

8

VSYS

VSYSPower input, must be shorted to the VSYS_S pin

9

GND

Ground

10

GND

Ground

11

VCC_3V3_S

VCC_3V3Power output, must be shorted to the VCC_3V3 pin

12

VCC_3V3

VCC_3V3Power input, must be shorted to the VCC_3V3_S pin

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; when used as GPIO, it affects PA39 and PA40

19

PA_29

Default SPI1_CS, can be used as GPIO; when expanded, the TF card on the core board must not be inserted

20

PA_24

Default SPI1_DO, can be used as GPIO; when expanded, the TF card on the core board must not be inserted

21

PA_28

Default SPI1_CLK, can be used as GPIO; when expanded, the TF card on the core board must not be inserted

22

PA_25

Default SPI1_DI, can be used as GPIO; when expanded, the TF card on the core board must not be inserted

23

PA_27

Default SD_DET, can be used as GPIO; when expanded, the TF card on the core board must not be inserted

24

PA_20

Default VIB PWM, can be used as GPIO; when expanded, the Motor on the core board must not be soldered

25

PA_19

Debug UART_TXD

26

PA_34

KEY1, power on/off and press and hold for 10s Reset

27

PA_18

Debug UART_RXD

28

PA_43

KEY2, function Buttons

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 Type-C. When a USB cable is plugged into the development board, these pins can be used as a 5 V output; when no USB cable is plugged into the development board, these pins can be used as a 5 V 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 circuitry. During operation, use a jumper cap 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 VBATS pin of the module. VBAT_S and VBAT are disconnected here to facilitate power consumption testing with an ammeter in series.

  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 circuitry. During operation, use a jumper cap 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 power consumption testing with an ammeter in series.

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

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

22p QSPI Pin Sequence FPC Interface Definition

22p FPC Connector Signal Definition

Pin

Pin Name

Function

1

VBAT

VBATPower 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

3.3VPower 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 RTNReset signal

22

GND

Ground

Power Supply Description

The SF32LB52 Huangshan Pi development board supports two power supply methods: USB Type-C and battery power.

  1. The onboard USB Type-C connector can power the board.

  2. It can be powered by a battery alone, allowing standalone operation without a computer.

Hardware Setup Options

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.

  1. 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.

  1. Reset

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

For details, refer to Firmware Flashing Tool Impeller

Charging and Battery Selection

The SF32LB52-Huangshan Pi development board integrates an SY6103 linear charging chip, supports a maximum charging current of 500 mA, and is set by default to a 450 mA constant current.

A 450 mAh to 500 mAh single-cell polymer lithium battery is recommended. The battery interface is a GH-1.25 mm female connector with a forward pinout. For polarity, refer to the silkscreen of the battery holder on the development board.

LCD Display Interface

The SF32LB52-Huangshan Pi core board supports QSPI-interface LCD screens. The connector is a 22p-0.5pitch FPC, flip-up, dual top/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.

Audio Interface

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

  • Supports audio signal input from the onboard mic.

  • Supports an external speaker (up to 3 W/4 ohms). Speaker connector specification: GH-1.25 mm female connector.

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.