4.2.1 maXTouch Xplained Pro Extension Headers

maXTouch Xplained Pro implements one Table 3-2 marked with XPRO EXTENSION HEADER in silkscreen. This header makes it possible to connect the board to any Xplained Pro MCU board using a 20-pin ribbon cable (included in kit). maXTouch Xplained Pro also implements one Table 3-3 marked with XPRO LCD CONNECTOR in silkscreen. The pin-out definition for the extension header can be seen in Table 4-2 and the pin-out for the LCD connector in Table 4-3.

Table 4-2. maXTouch Xplained Pro Standard Extension Header
Pin on EXT	Function	Description
1	ID	Communication line to ID chip
2	GND	Ground
3	Not Connected
4	Not Connected
5	GPIO	Command/Data Select
6	Not Connected
7	PWM	Backlight control
8	Not Connected
9	GPIO/IRQ	IRQ from maXTouch controller
10	GPIO	RESET signal for maXTouch and LCD controller
11	I²C SDA	I²C Data line for maXTouch controller
12	I²C SCL	I²C Clock line for maXTouch controller
13	Not Connected
14	Not Connected
15	CS	CS line for LCD controller
16	SPI MOSI	SPI Data to LCD controller
17	SPI MISO	SPI Data from LCD controller
18	SPI SCK	SPI Clock line
19	GND	Ground
20	VCC	Target supply voltage

Table 4-3. maXTouch Xplained Pro Xplained Pro LCD Connector
Pin number	Name	RGB interface description	MCU interface description
1	ID	Communication line to ID chip on extension board
2	GND	Ground
3	D0	Data line
4	D1	Data line
5	D2	Data line
6	D3	Data line
7	GND	Ground
8	D4	Data line
9	D5	Data line
10	D6	Data line
11	D7	Data line
12	GND	Ground
13	D8	Data line
14	D9	Data line
15	D10	Data line
16	D11	Data line
17	GND	Ground
18	D12	Data line
19	D12	Data line
20	D14	Data line
21	D15	Data line
22	GND	Ground
23	D16	Data line
24	D17	Data line
25	Not Connected
26	Not Connected
27	GND	Ground
28	Not Connected
29	Not Connected
30	Not Connected
31	Not Connected
32	GND	Ground
33	PCLK / CMD_DATA_SEL	Pixel clock	Display RAM select. One address line of the MCU for displays where it is possible to select either the register or the data interface
34	VSYNC / CS	Vertical synchronization	Chip select
35	HSYNC / WE	Horizontal synchronization	Write enable signal
36	DATA ENABLE / RE	Data enable signal	Read enable signal
37	SPI SCK	Clock for Serial peripheral interface
38	SPI MOSI	Master out slave in line of Serial peripheral interface
39	SPI MISO	Master in slave out line of Serial peripheral interface
40	SPI SS	Slave select for SPI. Should be unique if possible
41	Not Connected
42	TWI SDA	I²C data line (maXTouch)
43	TWI SCL	I²C clock line (maXTouch)
44	IRQ1	maXTouch interrupt line
45	Not Connected
46	PWM	Backlight control
47	RESET	Reset for both display and maxTouch
48	VCC	3.3V power supply for extension board
49	VCC	3.3V power supply for extension board
50	GND	Ground