Amlogic T982 development board for video-wall and HDMI-in signage. LVDS and
V-by-One display outputs with a 4K HDMI input, on a compact 110 × 100 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-MS98: its
connectors, pin assignments and electrical limits.
Connector map
T982 Amlogic A55 110 × 100 mm DC-IN-12V RJ45 USB2.0 USB-OTG HDMI-IN Audio DC-IN-12V RS232 USB-1 USB-2 RS485 USB-3 V-by-One LVDS TP-I2C GPIO MIC SPK LED+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 11 CPU Amlogic T982 , dual-core ARM Cortex-A55GPU ARM Mali-G52 MP2 (2EE) DDR LPDDR4 4 GB Flash eMMC 5.0, 32 GB (16 GB / 64 GB / 128 GB optional) Wi-Fi / BT 802.11 a/b/g/n/ac, dual 2.4 / 5 GHz + BT Ethernet RJ45 gigabit (1000 M) Screen interface LVDS, V-by-One HDMI HDMI in (4K) 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, V-by-One, RS232, RS485, 3 × USB, speaker,
microphone, LED/IR, GPIO and I2C headers.
Board dimensions
Size 110 mm × 100 mm Thickness 10 mm Top clearance 1.6 mm Bottom clearance 2.5 mm
Serial ports at a glance
The RS232 header 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 — 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).
Display ports
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) 31 D9N Output Pixel 0 negative data (even) 32 D9P Output Pixel 0 positive data (even) 33 D10N Output Pixel 1 negative data (even) 34 D10P Output Pixel 1 positive data (even) 35 GND GND Ground 36 GND GND Ground
3.4 V-by-One port — 51-pin, 0.5 mm
Pin Define Attribute Description 1 GND GND Ground 2 VBX1-7P Difference data Channel 7 3 VBX1-7N Difference data Channel 7 4 GND GND Ground 5 VBX1-6P Difference data Channel 6 6 VBX1-6N Difference data Channel 6 7 GND GND Ground 8 VBX1-5P Difference data Channel 5 9 VBX1-5N Difference data Channel 5 10 GND GND Ground 11 VBX1-4P Difference data Channel 4 12 VBX1-4N Difference data Channel 4 13 GND GND Ground 14 VBX1-3P Difference data Channel 3 15 VBX1-3N Difference data Channel 3 16 GND GND Ground 17 VBX1-2P Difference data Channel 2 18 VBX1-2N Difference data Channel 2 19 GND GND Ground 20 VBX1-1P Difference data Channel 1 21 VBX1-1N Difference data Channel 1 22 GND GND Ground 23 VBX1-0P Difference data Channel 0 24 VBX1-0N Difference data Channel 0 25 GND GND Ground 26 VB-LOCKN LOCKN Negative sampling clock 27 VB-HTPDN HTPDN HTPDN 28/29 NC NC NC 30 SEL_SECTIO SEL_SECTIO Data 31/32 NC NC NC 33 I2CM_C_SCL I2CM_C_SCL Data 34 I2CM_C_SDA I2CM_C_SDA Data 35 NC NC NC 36 BLON BLON BL- data 37 E-PWM_H E-PWM_H PWM- data 38–42 GND GND Ground 43 NC NC NC 44–51 V-by-One VCC VCC-12V VCC-12V
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
3.3 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
Power
3.5 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 .
3.6 RS232 port — PH2.0-4P
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
3.10 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).
3.7 USB1 · 3.8 USB2 · 3.9 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
Audio
3.12 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
3.13 MIC port — PH2.0-2P
Pin Define Attribute Description 1 MIC- Input Microphone negative 2 MIC+ Input Microphone positive
LED, IR and control
3.11 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
(GPIO_Z2, GPIO_Z3, GPIO_Z4) match the Define column below.
3.14 GPIO port — PH2.0-5P
Pin Define Attribute Description 1 GPIO_Z2 I/O GPIO_Z2 2 GPIO_Z3 I/O GPIO_Z3 3 GPIO_Z4 I/O GPIO_Z4 4 PWR KEY Power key Power key 5 GND GND Ground
See GPIO for reading and driving these lines from code.
Touch panel
3.15 I2C port — PH2.0-6P
Pin Define Attribute Description 1 GND GND Ground 2 SDA SDA I2C data 3 INT-L INT Interrupt 4 RST Reset Reset 5 SCL SCL I2C clock 6 VCC Power out VCC-3V
Other interfaces
3.16 Other ports
Interface Detail Power DC 5.5 × 2.1 mm barrel, 12 V / 3 A Ethernet RJ45, gigabit (1 G) USB 2 × USB 2.0 HDMI in HDMI 2.0a Audio / Mic 3.5 mm earphone and microphone
Electrical specification
Parameter Min Typical Max Notes Power supply voltage — 12V — Ripple voltage — — 85 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-MS98 support page .
