KTM-S76

RK3576 development board for AI, server and digital-signage applications. Octa-core (4 × Cortex-A72 + 4 × Cortex-A53) up to 2.2 GHz with a 6 TOPS NPU, LVDS / EDP / MIPI display, HDMI 2.0a in and out, and USB 3.0 on a 150 × 81.2 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-S76: its connectors, pin assignments and electrical limits.

Connector map

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
CPU	Rockchip RK3576 — quad-core Cortex-A72 + quad-core Cortex-A53, max 2.2 GHz
GPU	ARM Mali-G52 MC3
NPU	6 TOPS, RKNN
DDR	LPDDR 4 GB (8 GB / 16 GB / 32 GB optional)
Flash	eMMC 32 GB (32 GB / 64 GB / 128 GB optional)
Wi-Fi	802.11 a/b/g/n/ac, 2×2 MIMO, dual 2.4 / 5 GHz
Ethernet	RJ45 gigabit (1000 M)
Screen interface	LVDS, EDP, MIPI
HDMI	HDMI 2.0a out (4K) and HDMI 2.0a in (4K)
USB	USB 3.0 / USB 2.0
RTC	Yes — with scheduled power on/off
Audio / Mic	3.5 mm earphone and microphone
Camera	Via USB

Power: DC 12 V / 3 A via 5.5 × 2.1 mm barrel (current depends on screen size).

Internal expansion: LVDS, EDP, MIPI (each with power/backlight), 2 × RS232, RS485, 3 × USB, speaker, microphone, LED/IR, GPIO, a battery-backup header and a touch-panel header.

Board dimensions

Size	150 mm × 81.2 mm
Thickness	16 mm
Top clearance	1.6 mm
Bottom clearance	3.0 mm

Serial ports at a glance

The two RS232 headers and the RS485 header are driven through the standard serial interface. The datasheet does not give a /dev/ttyS* node for them.

Port	Device node	Type
RS232-1	—	RS232, full duplex
RS232-2	—	RS232, full duplex
RS485	—	RS485, half duplex

The RS232/RS485 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).

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Display ports

3.1 LVDS port — dual-contact 30-pin, 2.0 mm

Pin	Define	Attribute	Description
1	5V	Power out	3.3V / 5V / 12V optional
2	12V	Power out	3.3V / 5V / 12V optional
3	3.3V	Power out	3.3V / 5V / 12V optional
4	GND	GND	Ground
5	GND	GND	Ground
6	GND	GND	Ground
7	D0N	Output	Pixel 0 negative data (odd)
8	D0P	Output	Pixel 0 positive data (odd)
9	D1N	Output	Pixel 1 negative data (odd)
10	D1P	Output	Pixel 1 positive data (odd)
11	D2N	Output	Pixel 2 negative data (odd)
12	D2P	Output	Pixel 2 positive data (odd)
13	GND	GND	Ground
14	GND	GND	Ground
15	CLK0N	Output	Negative sampling clock (odd)
16	CLK0P	Output	Positive sampling clock (odd)
17	D3N	Output	Pixel 3 negative data (odd)
18	D3P	Output	Pixel 3 positive data (odd)
19	D5N	Output	Pixel 0 negative data (even)
20	D5P	Output	Pixel 0 positive data (even)
21	D6N	Output	Pixel 1 negative data (even)
22	D6P	Output	Pixel 1 positive data (even)
23	D7N	Output	Pixel 2 negative data (even)
24	D7P	Output	Pixel 2 positive data (even)
25	GND	GND	Ground
26	GND	GND	Ground
27	CLK1N	Output	Negative sampling clock (even)
28	CLK1P	Output	Positive sampling clock (even)
29	D8N	Output	Pixel 3 negative data (even)
30	D8P	Output	Pixel 3 positive data (even)

3.4 EDP port — dual-contact 20-pin, 2.0 mm

Pin	Define	Attribute	Description
1/2	VCC	VCC	—
3/4	GND	GND	Ground
5	EDP_TX0N	Difference data	Channel 0
6	EDP_TX0P	Difference data	Channel 0
7	EDP_TX1N	Difference data	Channel 1
8	EDP_TX1P	Difference data	Channel 1
9	EDP_TX2N	Difference data	Channel 2
10	EDP_TX2P	Difference data	Channel 2
11	EDP_TX3N	Difference data	Channel 3
12	EDP_TX3P	Difference data	Channel 3
13/14	GND	GND	Ground
15	XN	Data clock	Difference signal
16	XP	Data clock	Difference signal
17/18/19	GND	GND	Ground
20	NC	NC	NC

3.8 MIPI port — FPC 0.5 mm, 40-pin

Pin	Define	Attribute	Description
1	NC	NC	NC
2/3	3.0V	Power out	3.0V
4	GND	GND	Ground
5	RESET	RESET	LCD_RESET
6	NC	NC	Not connected
7	GND	GND	Ground
8	MIPI-0N	Output	MIPI_TXD0N
9	MIPI-0P	Output	MIPI_TXD0P
10	GND	GND	Ground
11	MIPI-1N	Output	MIPI_TXD1N
12	MIPI-1P	Output	MIPI_TXD1P
13	GND	GND	Ground
14	CLKN	Output	MIPI_CLKN
15	CLKP	Output	MIPI_CLKP
16	GND	GND	Ground
17	MIPI-2N	Output	MIPI_TXD2N
18	MIPI-2P	Output	MIPI_TXD2P
19	GND	GND	Ground
20	MIPI-3N	Output	MIPI_TXD3N
21	MIPI-3P	Output	MIPI_TXD3P
22	GND	GND	Ground
23/24	NC	NC	Not connected
25	GND	GND	Ground
26/27/28/29	NC	NC	Not connected
30	GND	GND	Ground
31/32	LED-K	Output	LED −
33/34/35/36/37/38	NC	NC	Not connected
39/40	LED-A	Output	LED +

Backlight and display power

3.2 LVDS power port — 6-pin, 2.0 mm

Selects the LVDS panel supply voltage by jumper.

Pin	Define	Attribute	Description
1	3.3V	LVDS VCC	3.3V
2	VCC-LVDS	LVDS VCC	3.3V
3	5V	LVDS VCC	5V
4	VCC-LVDS	LVDS VCC	5V
5	12V	LVDS VCC	12V
6	VCC-LVDS	LVDS VCC	12V

3.5 EDP power port — 6-pin, 2.0 mm

Pin	Define	Attribute	Description
1	3.3V	LVDS VCC	3.3V
2	VCC-LVDS	LVDS VCC	3.3V
3	5V	LVDS VCC	5V
4	VCC-LVDS	LVDS VCC	5V
5	12V	LVDS VCC	12V
6	VCC-LVDS	LVDS VCC	12V

3.3 LVDS backlight control port — PH2.0-6P

Pin	Define	Attribute	Description
1	VCC	Power out	12V
2	VCC	Power out	12V
3	BL-EN	Output	Backlight enable
4	BL-ADJ	Output	Backlight adjust
5	GND	GND	Ground
6	GND	GND	Ground

3.6 EDP backlight control port — PH2.0-6P

Pin	Define	Attribute	Description
1	VCC	Power out	12V
2	VCC	Power out	12V
3	BL-EN	Output	Backlight enable
4	BL-ADJ	Output	Backlight adjust
5	GND	GND	Ground
6	GND	GND	Ground

Power

3.7 Battery port — PH1.25-2P

Backup battery for the RTC.

Pin	Define	Attribute	Description
1	BAT+	2.8–3.3V	Battery plus
2	BAT-	GND	Battery ground

3.9 External power port — PH2.54-4P

Pin	Define	Attribute	Description
1	12V	Power in	12V
2	12V	Power in	12V
3	GND	GND	Ground
4	GND	GND	Ground

Serial ports

The RS232 and RS485 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.

3.10 RS232 (×2) port — PH2.0-4P

Two RS232 headers share this pinout.

Pin	Define	Attribute	Description
1	GND	GND	Ground
2	TX	I/O	UART0 TX
3	RX	I/O	UART0 RX
4	VCC	Power out	3.3V

3.11 RS485 port — PH2.0-4P

Pin	Define	Attribute	Description
1	GND	GND	Ground
2	RS485-A	I/O	UART0 A
3	RS485-B	I/O	UART0 B
4	VCC	Power out	3.3V

USB ports

Three internal USB headers, identical pinout (PH2.0-4P).

3.13 USB (×3) port — PH2.0-4P

Pin	Define	Attribute	Description
1	GND	GND	Ground
2	DP	I/O	USB D+
3	DM	I/O	USB D−
4	VCC	Power out	5V

Audio

3.12 MIC port — PH2.0-2P

Pin	Define	Attribute	Description
1	MIC-	Input	Microphone negative
2	MIC+	Input	Microphone positive

3.14 Speaker port — PH2.0-4P

Pin	Define	Attribute	Description
1	LP	Output	Left positive
2	LN	Output	Left negative
3	RN	Output	Right negative
4	RP	Output	Right positive

LED, IR and control

3.15 LED / IR port — PH2.0-5P

Pin	Define	Attribute	Description
1	LED_R	LED red	LED red
2	LED_G	LED green	LED green
3	VCC	Power out	3.3V
4	GND	GND	Ground
5	IR IN	Input	IR input

GPIO

These are the pins the GPIO API drives. The SDK names match the Define column below.

3.16 GPIO port — PH2.0-5P

Pin	Define	Attribute	Description
1	GPIO4_D5	I/O	GPIO4_D5
2	GPIO4_D3	I/O	GPIO4_D3
3	GPIO4_D4	I/O	GPIO4_D4
4	PWR KEY	Power key	Power key
5	GND	GND	Ground

See GPIO for reading and driving these lines from code.

Touch panel

3.17 I2S port — FPC 0.5 mm, 10-pin

note

The datasheet titles this connector "I2S", but its pins (RST, INT, SCL, SDA) are a touch-panel I2C interface, not an I2S audio bus. Treat it as touch-panel I2C and verify with us before wiring an I2S device to it.

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	VCC	VCC	3.3V
9	GND	GND	Ground
10	GND	GND	Ground

Other interfaces

3.18 Other ports

Interface	Detail
Power	DC 5.5 × 2.1 mm barrel, 12 V / 3 A
HDMI out	HDMI 2.0a
HDMI in	HDMI 2.0a
Ethernet	RJ45, gigabit (1 G)
USB	1 × USB 3.0, 1 × USB 2.0
Audio / Mic	3.5 mm earphone and microphone
OTG	Micro USB

Electrical specification

Parameter	Min	Typical	Max	Notes
Power supply voltage	—	12V	—
Ripple voltage	—	—	85 mV
Power supply current	—	3 A	—	Depends on screen size
Power consumption	—	36 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-S76 support page.