UI Processor Board

Index

3D Renderings

Schematics

MCU

Debug Header
Data Header
Power Header
UART1 Header
LCD-connector
USB-connector
SDRAM Memory
Flash Memory
EEPROM
Buzzer
LEDs
BOOT0 Header

Mechanical

3D Renderings

Top View

Bottom View

Schematics

Schematics can be found here.

MCU

The MCU is a STM32F429ZI which is basically an ARM Cortex-M4 with some convenient graphics peripherals. Some key features are:

SDRAM interface
Chrom-ART Accelerator (DMA2D) for handling graphics
LCD controller
A lot of communication interfaces (SPI, I2C, etc)
2MB of flash memory
Real time clock (RTC)

Debug Header

The JTAG-SWD connector has the following pinout:

Header	Name	MCU
1	3.3V	-
2	JTMS-SWDIO	PA13
3	GND	-
4	JTCK-SWCLK	PA14
5	GND	-
6	JTDO	PB3
7	(KEY)	-
8	JTDI	PA15
9	GND	-
10	NJTRST	PB4

Data Header

The data header is used to communicate with the data processor board. To avoid problems with ground loops and other nasty things the SPI signals coming from the MCU is converted to LVDS signals that are available at the header. It has the following pinout:

Header	Name	MCU After LVDS Driver/Receiver
1	SPI5_nCS_P	PF6
2	SPI5_nCS_N	PF6
3	SPI5_SCK_P	PF7
4	SPI5_SCK_N	PF7
5	SPI5_MISO_N	PF8
6	SPI5_MISO_P	PF8
7	SPI5_MOSI_P	PF9
8	SPI5_MOSI_N	PF9

Power Header

The power header provides the power to the board in from a 5V supply. It also has a pin with 3.3V coming from the board so that it can power external devices with 3.3V. VBAT is used to power the RTC when no external power is present on the 5V_IN pin, this makes sure the clock is still running. A POWER_STAT pin is used in conjunction with the connector board to tell which power source is in use. The I2C interface can be used for external communication with for example a "smart" battery pack.

Header	Name	MCU
1	5V_IN	-
2	GND	-
3	5V_IN	-
4	GND	-
5	3.3V	-
6	GND	-
7	VBAT	-
8	POWER_STAT	PB7
9	I2C3_SDA	PC9
10	I2C3_SCL	PA8

UART1 Header

UART1 is available here to be used for debugging, bootloading or to connect some external peripheral. The pinout is:

Header	Name	MCU
1	3.3V	-
2	GND	-
2	UART1_TX	PA9
3	UART1_RX	PA10

LCD-connector

The LCD connects to the board using a 40-pin 0.5mm pitch flat flex cable (FPC/FFC) which can be found easily on eBay or any other place. The pinout is:

FFC	Name	MCU
1	BL_VDD*	-
2	BL_VDD*	-
3	GND	-
4	3.3V	-
5	LCD_R0**	-
6	LCD_R1**	-
7	LCD_R2	PC10
8	LCD_R3	PB0
9	LCD_R4	PA11
10	LCD_R5	PA12
11	LCD_R6	PB1
12	LCD_R7	PG6
13	LCD_G0**	-
14	LCD_G1**	-
15	LCD_G2	PA6
16	LCD_G3	PG10
17	LCD_G4	PB10
18	LCD_G5	PB11
19	LCD_G6	PC7
20	LCD_G7	PD3
21	LCD_B0**	-
22	LCD_B1**	-
23	LCD_B2	PD6
24	LCD_B3	PG11
25	LCD_B4	PG12
26	LCD_B5	PA3
27	LCD_B6	PB8
28	LCD_B7	PB9
29	GND	-
30	LCD_CLK	PG7
31	LCD_DISP_ENABLE	PC4
32	LCD_HSYNC	PC6
33	LCD_VSYNC	PA4
34	LCD_DE	PF10
35	LCD_BL_ADJ***	PA7
36	GND	-
37	I2C3_SDA	PC9
38	I2C3_SCL	PA8
39	CTP_RST	PA2
40	CTP_INT	PA1

* Backlight power supply, can be set to 5V or 3.3V using jumper R18 and R17
** Grounded pins
*** TIM3_CH2 can be used for PWM on LCD_BL_ADJ

Please note that a 40-pin LCD can NOT be plugged into this connector directly as the board does not have a LED driver on it. To avoid any damage to anyone doing this anyway, pin 1 and 2 of the connector is connected to the same voltage BL_VDD which means that no current will flow trough the LCDs backlight which has VLED- on pin 1 and VLED+ on pin 2. The last four pin are also different from most 40-pin LCD which use these for any resistive touch panel that might be present.
TODO: Adapter board with LED driver so that one can connect a 40-pin LCD easily without using the big LCD board?

USB-connector

Name	MCU
HS_USB_N	PB14
HS_USB_P	PB15

SDRAM Memory

A 64-Mbit SDRAM is used as a buffer for the LCD and as a buffer for the graphics. More information on how this is handled can be found on the Simple GUI page.
TODO: Leave some memory for the user to store other things from the external flash for example.

SDRAM	Signal Name	MCU
SDRAM_nCS	SDNE1	PB6
SDRAM_nWE	SDNWE	PC0
SDRAM_nRAS	SDNRAS	PF11
SDRAM_nCAS	SDNCAS	PG15
SDRAM_CLK	SDCLK	PG8
SDRAM_CKE	SDCKE1	PB5
SDRAM_DQM0	NBL0	PE0
SDRAM_DQM1	NBL1	PE1
SDRAM_BA0	BA0	PG4
SDRAM_BA1	BA1	PG5
SDRAM_A0	RAM_A0	PF0
SDRAM_A1	RAM_A1	PF1
SDRAM_A2	RAM_A2	PF2
SDRAM_A3	RAM_A3	PF3
SDRAM_A4	RAM_A4	PF4
SDRAM_A5	RAM_A5	PF5
SDRAM_A6	RAM_A6	PF12
SDRAM_A7	RAM_A7	PF13
SDRAM_A8	RAM_A8	PF14
SDRAM_A9	RAM_A9	PF15
SDRAM_A10	RAM_A10	PG0
SDRAM_A11	RAM_A11	PG1
SDRAM_A12	RAM_A12	PG2
SDRAM_D0	RAM_D0	PD14
SDRAM_D1	RAM_D1	PD15
SDRAM_D2	RAM_D2	PD0
SDRAM_D3	RAM_D3	PD1
SDRAM_D4	RAM_D4	PE7
SDRAM_D5	RAM_D5	PE8
SDRAM_D6	RAM_D6	PE9
SDRAM_D7	RAM_D7	PE10
SDRAM_D8	RAM_D8	PE11
SDRAM_D9	RAM_D9	PE12
SDRAM_D10	RAM_D10	PE13
SDRAM_D11	RAM_D11	PE14
SDRAM_D12	RAM_D12	PE15
SDRAM_D13	RAM_D13	PD8
SDRAM_D14	RAM_D14	PD9
SDRAM_D15	RAM_D15	PD10

Flash Memory

The board has a 16-Mbit flash memory that can be used to store large images that are to be used on the display for example.

Name	MCU
SPI4_SCK	PE2
FLASH_nCS	PE4*
SPI4_MISO	PE5
SPI4_MOSI	PE6

* Has pull-up resistor to 3.3V

EEPROM

A 256Kbit EEPROM is available on the board for storing data. This can be used to save settings or other things that need to be retained after the power to the board has been removed.