Model C Evaluation Board

Overview

  • The RTL87x2G model C evaluation board is compatible with the following daughter boards:

  • The RTL87x2G model C evaluation board provides a hardware environment for user development, including:

    • 5V to 3.3V & 1.8V power module

    • Support QSPI (Group1) and I8080 (Group2) display interface

    • Support audio module (AMIC, DMIC) interface

    • Red LED and RGB LED module

    • Audio Power Amplifier Module

    • USB to UART chip, FT232RL

Note

If you require modules for the model C evaluation board, please contact Realtek FAE for assistance.

Blocks Distribution

Blocks distribution on the front and back of the model C evaluation board are as following.

../../../_images/EVB_model_C_blocks_distribution_Diagram-Front.jpg

Model C EVB blocks distribution diagram-Front

../../../_images/EVB_model_C_blocks_distribution_Diagram-Back.jpg

Model C EVB blocks distribution diagram-Back

The following introduces the blocks on the evaluation board in counterclockwise order.

Introduction of the blocks on the model C evaluation board

Blocks

Introduction

EVB Daughter Board Socket

Used to connect the EVB daughter board with an anti-reverse insertion mechanism

Display Interface Type Selection

Model C evaluation board supports QSPI (Group1) and I8080 (Group2) display interface

Display Power Selection

Supports USB port CON1, CON2, or battery to power the display

UART/LOG Test Interface

Supports download mode and normal mode

IC Power Consumption Test Interface

Provides power consumption test interface for 1.8V or 3.3V

Li-ion Battery Socket

Two pins socket to connect a single cell Li-ion battery

USB Port CON1

Used to power EVB and communicate with RTL87x2G via USB

IC Power Voltage Selection

Provides power voltage options of 1.8V or 3.3V

Reset Key

Pressing this key resets the system

External Power Supply

Provides external power supply of 1.8V and 3.3V

SD Nand Flash Interface

Used to connect the RTK SD Nand Flash daughter board

Microphone Socket

Supports 3.5mm audio interface

Microphone Interface

Used to connect the external Microphone daughter board

SWD Interface

Used to SWD debug

24bits ADC Interface

24bits ADC, AIN0-3 can be used as four single-ended inputs. AIN0-1 and AIN2-3 can be used as two differential inputs

Red LED and RGB LED module

Provides four red LEDs and one RGB LED

Audio Power Amplifier Module

Uses the ALC105-VF. It is a stereo class-D audio amplifier with maximum output power of 3W per channel

Independent Keys

KEY2, KEY3, KEY4, KEY5 are connected to P10_2, P10_1, P9_2 and P9_1 respectively

USB Port CON2

Used to power the EVB and connect USB to UART chip FT232RL for downloading programs or debug

Display Socket

Used to connect display screen

Interfaces Distribution

../../../_images/EVB_model_C_interfaces_distribution_Diagram-Front.png

Model C EVB interfaces distribution diagram-Front

../../../_images/EVB_model_C_interfaces_distribution_Diagram-Back.png

Model C EVB interfaces distribution diagram-Back

Blocks and Interfaces Introduction

EVB Daughter Board

EVB Daughterboard can be removed and replaced. There is an anti-reverse insertion mechanism between the motherboard and the daughterboard. RTL8762GTP and RTL8762GTH daughter board is compatible with the RTL87x2G model C evaluation board.

../../../_images/RTL8762GTP_and_RTL8762GTH_daughterboard.png

RTL8762GTP and RTL8762GTH daughter board

Power

USB Port CON1

USB port CON1 is used to power the model C evaluation board and communicate with RTL87x2G via USB.

USB Port CON2

USB port CON2 is used to power the model C evaluation board and connect USB to UART chip FT232RL for downloading programs or debug.

../../../_images/USB_socket_CON1_2_of_EVB_model_C.png

USB Port CON1 and CON2 of EVB model C

Li-ion Battery Socket

Model C evaluation board supports li-ion battery power supply. By connecting the jumper marked in red, the li-ion battery can be charged by USB.

../../../_images/Lithium_battery_interface_of_EVB_model_C.jpg

Li-ion Battery Socket of model C evaluation board

IC Power Voltage Selection

VDD_VBAT/VDDIO/VDDIO_EXT can choose 1.8V or 3.3V power supply according to the actual application, with default connection of 3.3V, as shown below. Power input pins are introduced as follows:

Introduction of power supply input pins on model C EVB

Pin Name

Function

V33_USB

Power supply for USB transceiver

VD33_PA

Power supply for the internal +14dBm radio power amplifier

AVDD

Power supply for the internal 24bits ADC

VDD_VBAT

Power supply for the internal regulator and analog circuitry

VDDIO

Power supply for PAD and Flash

VDDIO18

Power supply for MCM PSRAM

VDDIO_EXT

Power supply for external devices

../../../_images/Power_select_of_EVB_model_C.jpg

Power select of model C EVB

Note

  1. VDDIO and VDDIO_EXT power supplies should be consistent.

  2. When using RTL8762GTP daughter board, VDDIO18 in J14 can only choose 1.8V.

EVB Interfaces

UART/LOG Test Interface

Download Mode: Need to set the dial switches SW1/SW2 to ON position, which will pull down the LOG pin, then press reset button or power on again to enter download mode.

Normal Mode: Need to set the dial switches SW1/SW2 to 1 position, which will pull none the LOG pin, then press reset button or power on again to start running the program. Log pin can be used for debug. Please refer to normal mode connection.

../../../_images/UART_LOG_test_interface-front_of_EVB_model_C.jpg

UART/LOG test interface-front of model C EVB

../../../_images/UART_LOG_test_interface-back_of_EVB_model_C.jpg

UART/LOG test interface-back of model C EVB

Red LED and RGB LED module

Red LED and RGB LED module can be connected to the pin header within the red box through jumpers, allowing the default GPIO to control the LED and RGB. Alternatively, you can use dupont wires to connect the pin header on the right side of the red box to any GPIO for controlling the LED and RGB.

../../../_images/LED_RGB_interface_of_EVB_model_C.jpg

Red LED and RGB LED module of model C EVB

SD Nand Flash Interface

SD NAND Flash interface can be used with the RTK SD NAND Flash daughter board. Please pay attention to the order of the plugging positions to prevent a reverse connection.

../../../_images/SD_NAND_flash_interface_and_daughterboard_of_EVB_model_C.jpg

SD NAND Flash interface and daughter board of model C EVB

../../../_images/SD_NAND_flash_power_control_of_EVB_model_C.jpg

SD NAND Flash power control of model C EVB

Note

  1. Normal Mode: When using the SD Nand Flash module, you need to use a jumper to connect the J35 pin header.

  2. Low Power Mode: Remove the jumper cap from J35, and then connect the pin headers marked in the blue box in J37 to any GPIO. When the GPIO output is high, the SD Nand Flash module work normally. When the GPIO output is low, the module does not work.

EVB Pin Assignment

Please refer to the latest RTL87x2G IOPin Information table about the pin assignment of daughter board.

EVB User Guide

EVB Power Connection

Model C evaluation board can be powered independently using USB port CON2, in which case the USB communication function of RTL87x2G cannot be used, but programs can be normally downloaded into RTL87x2G. The power connection of the evaluation board is shown below. All jumpers marked in the red box need to be connected.

../../../_images/Power_supply_with_USB_socket_CON2_of_EVB_model_C.jpg

Power supply with USB port CON2 of model C EVB

If the USB communication function of RTL87x2G needs to be used, both the USB Ports CON1 and CON2 on the evaluation board need to be connected. In this situation, the power supply connection is shown below, and all jumpers marked in the red box need to be placed.

../../../_images/Power_supply_with_USB_socket_CON1%262_of_EVB_model_C.png

Power supply with USB Port CON1 and CON2 of model C EVB

Download Mode Connection

P0_3 (log) is the download mode selection pin. When P0_3 is pulled low, hardware reset or power cycling will put the system into download mode. Use a jumper to connect P3_0 to RX and P3_1 to TX. Set the DIP switch to the ON position (pulling P0_3 low), and then hardware reset or power on the board to enter download mode. After the program download is complete, set the DIP switch back to the 1 position, allowing P0_3 to return to a floating state. Finally, press the reset key or power cycle the board, and the program will run normally.

../../../_images/Download_connection_of_EVB_model_C.jpg

Download mode of model C EVB

Normal Mode Connection

Please confirm that the dial switches SW1/SW2 are set to the 1 position. Then place the jumper on the red box in the figure below. Connect P0_3 (log) to RX, P3_0 and P3_1 are disconnected from RX and TX respectively. Use the Debug Analyzer via the USB port CON2 for debug.

../../../_images/Debug_connection_of_EVB_model_C.jpg

Normal mode connection of model C EVB

Audio Power Amplifier Module

The PD signal can be connected to any GPIO, and then the audio power amplifier module can be enabled by pulling it high and disabled by pulling it low. Users can choose to use 5V or 3.3V power supply of the audio power amplifier module by connecting jumpers.

../../../_images/PA_power_supply_of_EVB_model_C.png

Audio power amplifier module power supply of model C EVB

The default connection is the jumper shown in red on the left side of Figure. It is used to mono mode for 3.5 mm jack headphone.

Audio can also be output through the white VH-2A Socket to connect to the speaker on the right side of Figure. It is necessary to connect the jumper shown in red and add R262 and R261 when using differential output.

../../../_images/PA_interface_of_EVB_model_C.png

Audio power amplifier module interface of model C EVB

Display Interface

Power Selection

It supports USB port CON1, CON2, or battery to power the display.

../../../_images/Display_connection_of_EVB_model_C.jpg

Display power selection of model C EVB

Display Interface Type Selection

Display interface type can be selected by setting the status of LCD_IM[1:0] based on used screen. Please refer to the datasheet of display driver chip for details.

Pin assignment of the QSPI (Group1) and I8080 (Group2) interface on the model C evaluation board

PIN Name

QSPI (Group1) interface

I8080 (Group2) interface

P2_3

TP_RST

TP_RST

P2_4

TP_INT

TP_INT

P5_7

TP_SCL

TP_SCL

P1_3

TP_SDA

TP_SDA

P1_4

LCD_BL_CTRL

LCD_BL_CTRL

P4_3

QSPI_CS

8080_D7

P3_4

QSPI_DCX

P4_0

QSPI_CLK (PHY)

8080_D4

P3_3

QSPI_SIO3

P3_2

QSPI_SIO2

P4_1

QSPI_SIO1

8080_D5

P4_2

QSPI_SIO0

8080_D6

P3_6

LCD_RESX

LCD_RESX

P0_5

LCD_TE (VSYNC)

8080_D1

P0_2

8080_WR#

P1_5

8080_DCX

P1_6

8080_RD#

P0_7

8080_D3

P0_6

8080_D2

P0_4

8080_D0

P0_1

8080_LCD_TE

P0_0

8080_CS#

IC Power Consumption Test

Model C evaluation board provides power consumption test interface for 1.8V and 3.3V.

  • When the IC is powered by 3.3V, disconnect J102 before measuring. Then connect the ammeter to measure the current passing through J102.

  • When the IC is powered by 1.8V, disconnect J103 before measuring. Then connect the ammeter to measure the current passing through J103.

../../../_images/Schematic_Diagram_of_power_consumption_points_on_EVB_model_C.jpg

IC power consumption test interface

Note

  1. Please properly connect the jumpers according to the introduction of power supply input pins and the power consumption measurement scenarios.

  2. To avoid extra power consumption, it is necessary to turn off log printing.

  3. To avoid the effect from debugging equipment, please do not connect UART, SWD, and debugger.

  4. When using an external DC power supply, it needs to be applied to VDD_3V3_IC. Note that when using the RTL8762GTP daughter board, since the MCMPSRAM of the RTL8762GTP daughter board is powered by 1.8V, the external DC power supply voltage applied to VDD_1V8_IC can only be 1.8V.

RF Test

When performing RF performance testing for Bluetooth/Zigbee using the RF Test Tool, the two jumpers marked in red need to be connected, and then set the DIP switches on both the front and back to the 1 position, allowing P0_3 to return to a floating state, P3_0 connected to RX, and P3_1 connected to TX.

../../../_images/RF_test_model_C.png

Connection for RF test