KTM-S58

RK3568 development board for all-in-one digital signage and signage players. LVDS, EDP and HDMI 2.0a (4K@60Hz) display outputs, gigabit Ethernet, USB 2.0/3.0, PoE and three UART headers on a 150 × 75.6 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-S58: 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 11.0
CPU	Rockchip RK3568, quad-core ARM Cortex-A55
DDR	DDR3 / DDR3L / DDR4 / LPDDR3 / LPDDR4 / LPDDR4X, 2 GB / 4 GB
Flash	eMMC 5.0, 8 GB / 16 GB / 32 GB
Wi-Fi	802.11 a/b/g/n/ac, dual 2.4 / 5 GHz
Ethernet	RJ45 gigabit (1000 M)
Screen interface	LVDS, EDP
HDMI	HDMI 2.0a out, up to 4K@60Hz
USB	USB 2.0 and USB 3.0
RTC	Yes — with scheduled power on/off
Audio	3.5 mm earphone
Camera	Via USB

Power: DC 12 V / 3 A via 6.0 mm barrel (current depends on screen size).

Internal expansion: 3 × USB 2.0, 3 × UART, LVDS, EDP, dual backlight, PoE, speaker, microphone, LED/IR, 2 × GPIO header, touch-panel I2C and camera I2C.

Board dimensions

Size	150 mm × 75.6 mm
Thickness	8 mm
Top clearance	1.6 mm
Bottom clearance	2 mm

Serial ports at a glance

The three UART headers are driven through the standard serial interface. The device node, where the datasheet gives one, is in the pin tables below — this is the path your application opens.

Port	Device node	Type
UART1	—	UART
UART2	/dev/ttyS4	UART
UART3	/dev/ttyS3	UART

The UART1 device node is not specified in the datasheet. Confirm on your board with ls /dev/ttyS* or contact us. The RS232/485 level for a header is selected by the RS232/485 power jumper (§3.3). 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)

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

Pin	Define	Attribute	Description
1	VCC	3.3V VCC	3.3V
2	VCC	3.3V VCC	3.3V
3	GND	GND	Ground
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	GND	GND	Ground
14	GND	GND	Ground
15	EDP_AUXN	Data clock	Difference signal
16	EDP_AUXP	Data clock	Difference signal
17	GND	GND	Ground
18	GND	GND	Ground
19	GND	GND	Ground
20	HPD	HPD	Hot Plug Detect signal pin

Backlight and display power

3.2 LVDS / EDP power port (Jumper1) — dual-contact 6-pin, 2.0 mm

Selects the LVDS/EDP panel supply voltage by jumper.

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

3.3 RS232/485 power port (Jumper2) — dual-contact 6-pin, 2.0 mm

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

3.4 Backlight Con1 port — PH2.0-6P

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

3.6 Backlight Con2 port — PH2.0-6P

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 and PoE

3.7 PoE port — PH2.54-4P

Pin	Define	Attribute	Description
1	POE1	PoE	PoE 1
2	POE2	PoE	PoE 2
3	POE3	PoE	PoE 3
6	POE4	PoE	PoE 4

3.8 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

USB ports

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

3.9 USB1 · 3.10 USB2 · 3.11 USB3 — 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

Serial ports

The UART headers are driven through the standard serial interface — open the device node listed for each. The device API (ItempApiPub) does not handle UART I/O; it covers power, display, GPIO, network and kiosk.

3.12 UART1 port — PH2.0-4P

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

3.13 UART2 port — PH2.0-4P → /dev/ttyS4

Pin	Define	Attribute	Description
1	VCC	Power out	3.3V
2	TX	I/O	ttyS4 — UART TX
3	RX	I/O	ttyS4 — UART RX
4	GND	GND	Ground

3.14 UART3 port — PH2.0-4P → /dev/ttyS3

Pin	Define	Attribute	Description
1	VCC	Power out	3.3V
2	TX	I/O	ttyS3 — UART TX
3	RX	I/O	ttyS3 — UART RX
4	GND	GND	Ground

Audio

3.15 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

3.17 MIC port — PH2.0-2P

Pin	Define	Attribute	Description
1	N	Negative	Microphone negative
2	P	Positive	Microphone positive

LED, IR and control

3.16 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.

3.18 GPIO port — PH2.0-5P

Pin	Define	Attribute	Description
1	GPIO_A0	I/O	GPIO8_A0
2	GPIO_A1	I/O	GPIO8_A1
3	GPIO_A3	I/O	GPIO8_A3
4	Power key	I/O	Power key
5	GND	GND	Ground

3.19 GPIO port — PH2.0-4P

Pin	Define	Attribute	Description
1	BLUE	I/O	GPIO8_A1
2	RED	I/O	GPIO8_A1
3	GREEN	I/O	GPIO8_A0
4	12V	Power	12V

note

The datasheet lists both BLUE and RED as GPIO8_A1. This may be a typo or an intentional shared line — verify on hardware before relying on independent control of these two.

See GPIO for reading and driving these lines from code.

I2C and touch panel

3.20 TP I2C port — 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	VCC	VCC	3.3V
9	GND	GND	Ground
10	GND	GND	Ground

3.21 I2C port (camera) — PH2.0-6P

Pin	Define	Attribute	Description
1	VCC	Power out	3.3V
2	CM_SCL	SCL	I2C clock
3	CM_RST	Reset	Reset
4	INT_L	Interrupt	Interrupt
5	CM_SDA	SDA	I2C data
6	GND	GND	Ground

Other interfaces

3.22 Other ports

Interface	Detail
Power	DC 6.0 mm barrel, 12 V / 3 A
HDMI out	HDMI 2.0a
Ethernet	RJ45, gigabit (1 G)
USB	3 × USB 2.0
Audio	3.5 mm earphone
TF card	Up to 64 GB

Electrical specification

Parameter	Min	Typical	Max	Notes
Power supply voltage	—	12V	—
Ripple voltage	—	—	65 mV
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-S58 support page.