Compact RK3566 development board for embedded signage. USB-C power and data
(USB 3.0 / 2.0 / OTG), single-line LVDS with MIPI and EDP headers, HDMI input,
Wi-Fi 6 + BT 5.0 on a 151 × 75 mm board.
This page is the hardware reference
Flashing, the firmware API and the guides
apply to every board. This page covers what is specific to the KTM-S68B: its
connectors, pin assignments and electrical limits.
Connector map
RK3566 Cortex-A55 151 × 75 mm SPK MIC1-2 MIPI LVDS Sensor RS232-GPIO USB-C3.0 USB-C2.0 USB-C OTG USB-C DC-IN DC-IN EDP-BL eDP USB1-4 RTC LVDS-BL GPIO-KEY RS232-1 RS232-2 IR
Swipe sideways to see the whole board. Tap a connector to jump to its pin definition. Positions are schematic, not to scale.
Specification
OS Android 14.0 CPU Rockchip RK3566 , quad-core Cortex-A55 up to 2.0 GHzGPU Mali-G52 2EE — OpenGL ES 1.1/2.0/3.2, OpenCL 2.0, Vulkan 1.1 DDR LPDDR4 / LPDDR3, 2 GB / 4 GB Flash eMMC 5.0, 8 GB / 16 GB / 32 GB Wi-Fi / BT 802.11 a/b/g/n/ac/ax + BT 5.0, 2×2 MIMO, dual 2.4 / 5 GHz Ethernet Via USB-C to RJ45 adapter Screen interface LVDS (MIPI and EDP headers also fitted) HDMI HDMI in (Mini) RTC Yes — with scheduled power on/off Audio Audio out 2-channel, 2 × microphone Camera Via USB USB 1 × USB-C 3.0 / 1 × USB-C 2.0 / 1 × USB Micro OTG
Power: USB-C, 12 V / 3 A (current depends on screen size). A DC-in header
(§3.6) is also provided.
The specification table names the SoC RK3566 , but the description text on the
same datasheet says RK3568 . This page follows the specification table
(RK3566); confirm the exact SoC with us if it matters for your build.
Internal expansion: 4 × USB 2.0, 2 × GPIO, 2 × MIC, 2 × RS232, speaker, LVDS,
MIPI, EDP, DC-in, RTC battery, IR+LED, light-perception and sensor headers.
Board dimensions
Size 151 mm × 75 mm (total), 142 mm × 75 mm (PCB) Thickness 8 mm Top clearance 4 mm Bottom clearance 3 mm
Serial ports at a glance
The board provides two RS232 interfaces (one on the RS232+GPIO combo header §3.7,
one on §3.9), driven through the standard serial interface. The datasheet does
not give a /dev/ttyS* node for them.
Port Device node Type RS232 (§3.7, with GPIO) — RS232 RS232 (§3.9) — RS232
The RS232 device nodes are not specified in the datasheet. Confirm on your board
with ls /dev/ttyS* or contact us. See the
firmware API overview for how the device API drives the board
(power scheduling, GPIO, display, network, kiosk lockdown).
Display ports
3.1 LVDS port — single-line 30-pin
Pin Define Attribute Description 1 TX0_D0N Output Pixel 0 negative data (odd) 2 TX0_D0P Output Pixel 0 positive data (odd) 3 TX0_D1N Output Pixel 1 negative data (odd) 4 TX0_D1P Output Pixel 1 positive data (odd) 5 TX0_D2N Output Pixel 2 negative data (odd) 6 TX0_D2P Output Pixel 2 positive data (odd) 7 GND GND Ground 8 TX0_CLKN Output Negative sampling clock (odd) 9 TX0_CLKP Output Positive sampling clock (odd) 10 TX0_D3N Output Pixel 3 negative data (odd) 11 TX0_D3P Output Pixel 3 positive data (odd) 12 TX1_D0N Output Pixel 0 negative data (even) 13 TX1_D0P Output Pixel 0 positive data (even) 14 GND GND Ground 15 TX1_D1N Output Pixel 1 negative data (even) 16 TX1_D1P Output Pixel 1 positive data (even) 17 GND GND Ground 18 TX1_D2N Output Pixel 2 negative data (even) 19 TX1_D2P Output Pixel 2 positive data (even) 20 TX1_CLKN Output Negative sampling clock (even) 21 TX1_CLKP Output Positive sampling clock (even) 22 TX1_D3N Output Pixel 3 negative data (even) 23 TX1_D3P Output Pixel 3 positive data (even) 24 GND GND Ground 25 NC NC Not connected 26 NC NC Not connected 27 NC NC Not connected 28 VCC Power out 3.3V / 5V / 12V optional 29 VCC Power out 3.3V / 5V / 12V optional 30 VCC Power out 3.3V / 5V / 12V optional
3.3 MIPI port — FPC 0.5 mm, 40-pin
Pin Define Attribute Description 1 VCOM NC NC 2 VDD1 VCC 3.3V 3 VDD2 VCC 3.3V 4 GND1 GND Ground 5 RESET Reset LCD_RESET 6 NCP NC NC 7 GND2 GND Ground 8 D0N Output DSI_TX1_D0N 9 D0P Output DSI_TX1_D0P 10 GND3 GND Ground 11 D1N Output DSI_TX1_D1N 12 D1P Output DSI_TX1_D1P 13 GND4 GND Ground 14 CLKN Output DSI_TX1_CLKN 15 CLKP Output DSI_TX1_CLKP 16 GND5 GND Ground 17 D2N Output DSI_TX1_D2N 18 D2P Output DSI_TX1_D2P 19 GND6 GND Ground 20 D3N Output DSI_TX1_D3N 21 D3P Output DSI_TX1_D3P 22 GND7 GND Ground 23 NC NC NC 24 NC1 NC1 NC1 25 GND8 GND Ground 26 NC2 NC NC 27 PWMO NC NC 28 NC4 NC NC 29 VCL NC NC 30 GND GND Ground 31 LED- LED cathode LED cathode 32 LED- LED cathode LED cathode 33 NC5 NC NC 34 NC6 NC NC 35 AVEE NC NC 36 NC7 NC NC 37 NC8 NC NC 38 AVDD3 NC NC 39 LED+ LED anode LED anode 40 LED+ LED anode LED anode
3.4 EDP port — CN1, 30-pin
The datasheet lists pins 6–7 with the same define as pins 3–4 (TX_D1N /
TX_D1P) while their description reads "Channel 0". Pins 6–7 are the channel-0
pair (most likely TX_D0N / TX_D0P); the defines are kept here as printed.
Verify against your panel before wiring.
Pin Define Attribute Description 1 NC NC Not connected 2 GND GND Ground 3 TX_D1N Difference data Channel 1 4 TX_D1P Difference data Channel 1 5 GND GND Ground 6 TX_D1N Difference data Channel 0 7 TX_D1P Difference data Channel 0 8 GND GND Ground 9 AUX_CH_P Data clock Difference signal 10 AUX_CH_N Data clock Difference signal 11 GND GND Ground 12 LCD_VCC VCC LCD power 3.3V 13 LCD_VCC VCC LCD power 3.3V 14 BIST NC/22R Ground 15 GND GND Ground 16 GND GND Ground 17 HPD HPD Hot Plug Detect signal 18 GND GND Ground 19 GND GND Ground 20 GND GND Ground 21 GND GND Ground 22 EN2 EN Backlight enable 23 PWM2 PWM PWM signal 24 NC NC Not connected 25 NC NC Not connected 26 BL_PWR Power out Backlight power 12V 27 BL_PWR Power out Backlight power 12V 28 BL_PWR Power out Backlight power 12V 29 BL_PWR Power out Backlight power 12V 30 NC NC Not connected
Backlight and display power
3.2 LVDS BL port — PH1.25-6P
Pin Define Attribute Description 1 GND GND Ground 2 GND GND Ground 3 BL-ADJ Output Backlight adjust 4 BL-EN Output Backlight enable 5 VCC Power out 12V 6 VCC Power out 12V
3.5 EDP BL port — PH1.25-6P
Pin Define Attribute Description 1 GND GND Ground 2 GND GND Ground 3 BL-ADJ Output Backlight adjust 4 BL-EN Output Backlight enable 5 VCC Power out 12V 6 VCC Power out 12V
Power
3.6 DC-in port — PH1.25-6P
Alternative DC input (the board is normally powered over USB-C).
Pin Define Attribute Description 1 DCIN_A Power in DC in 12V 2 DCIN_A OR OR 3 DCIN_A GND GND 4 DCIN_B GND GND 5 DCIN_B OR OR 6 DCIN_B Power in DC in 12V
3.12 RTC battery port — PH1.25-2P
Pin Define Attribute Description 1 GP Power in 3.3V 2 GND GND Ground
Serial and GPIO
The RS232 headers are driven through the standard serial interface. The device
API (ItempApiPub) does not handle UART I/O; it covers power ,
display , GPIO , network and
kiosk . GPIO lines (GPIO_I/O 1–5) are driven by the
GPIO API .
3.7 RS232 + GPIO port — PH1.25-6P
Pin Define Attribute Description 1 IO1 I/O GPIO_I/O 1 2 IO2 I/O GPIO_I/O 2 3 VCC Power out 3.3V 4 RX I/O UART0 RX 5 TX I/O UART0 TX 6 GND GND Ground
3.8 GPIO + Key port — PH1.25-5P
Pin Define Attribute Description 1 GND GND Ground 2 KEY KEY Power key 3 IO5 I/O GPIO_I/O 5 4 IO4 I/O GPIO_I/O 4 5 IO3 I/O GPIO_I/O 3
3.9 RS232 (×2) port — PH1.25-4P
Pin Define Attribute Description 1 VCC Power out 3.3V 2 RX I/O UART0 RX 3 TX I/O UART0 TX 4 GND GND Ground
Reserved / ADC
3.10 Reserved port — PH1.25-2P
Pin Define Attribute Description 1 ADC — — 2 GND GND Ground
USB ports
Four internal USB headers, identical pinout (PH1.25-4P).
3.13 USB (×4) port — PH1.25-4P
Pin Define Attribute Description 1 VCC VCC 3.3V 2 DM I/O USB D− 3 DP I/O USB D+ 4 GND GND Ground
Audio
3.14 Speaker port — PH1.25-4P
Stereo output (two channels).
Pin Define Attribute Description 1 SP1P Output SP1 positive 2 SP1N Output SP1 negative 3 SP2P Output SP2 positive 4 SP2N Output SP2 negative
3.15 Microphone (×2) port — PH1.25-2P
Pin Define Attribute Description 1 MIC+ Positive MIC positive 2 MIC- Negative MIC negative
LED, IR and sensors
3.11 LED + IR port — PH1.25-5P
Pin Define Attribute Description 1 G LED green LED green 2 R LED red LED red 3 GND GND Ground 4 IR Input IR input 5 3.3V Power out 3.3V
3.16 Sensor port — PH1.25-3P
The datasheet's description for pin 2 reads "SP1 Negative", which appears copied
from the speaker port. Treat pin 2 as a general sensor I/O line and verify its
function with us before use.
Pin Define Attribute Description 1 5V Power out 5.0V 2 IO I/O SP1 negative 3 GND GND Ground
Touch panel
3.17 Touchpanel I2C port — FPC 0.5 mm, 10-pin
Pin Define Attribute Description 1 GND GND Ground 2 GND GND Ground 3 RST Reset Reset 4 INT Interrupt Interrupt 5 GND GND Ground 6 SCL SCL I2C clock 7 SDA SDA I2C data 8 3.3V VCC 3.3V 9 GND GND Ground 10 GND GND Ground
Other interfaces
3.18 Other ports
Interface Detail Power USB-C, 12 V / 3 A USB 1 × USB-C 2.0 USB 1 × USB-C 3.0 USB 1 × USB-C OTG
Electrical specification
Parameter Min Typical Max Notes Power supply voltage — 12V — Ripple voltage — — — Power supply current — 2.5 A — Depends on screen size Power consumption — 30 W — Depends on screen size
API reference
The device API (power scheduling, GPIO, display, network, kiosk lockdown) is
documented under ItempApi reference . The serial ports above
are driven through the standard Android serial interface.
Downloads
Schematic, mechanical drawing and firmware image are on the
KTM-S68B support page .
