ETRA SOM/ETRA Evaluation Kit/Interfaces and Connectors/AUX

History
Issue Date	Notes
2021/04/06	First release

Auxiliary connectors interface

Description

The Auxiliary connectors on the Evaluation Kit are J11 and J12, 2x15x2.54mm stripline header.

On these connectors are available many interfaces, some of this peripherals are not available at the same time:

• FDCAN1
• FDCAN2
• I2C5
• SPI5
• UART7
• SAI2
• 11x8 keyboard matrix
• LED driver
• JTAG

Auxiliary connectors

Signals

The following tables describe the connectors signals:

• J11

Pin#	SOM Pin#	Pin name	POWER	JTAG	KEYBOARD	LED
1	-	5V_CB	5V
2	-	3V3_CB	3.3V
3	J18.143	ADP5589_R2			ROW_2
4	J18.149	ADP5589_C0			COLUMN_0	LED_0
5	J18.141	ADP5589_R3			ROW_3
6	J18.151	ADP5589_C1			COLUMN_1	LED_1
7	J18.139	ADP5589_R4			ROW_4
8	J18.155	ADP5589_C2			COLUMN_2	LED_2
9	J18.137	ADP5589_R5			ROW_5
10	J18.157	ADP5589_C3			COLUMN_3	LED_3
11	J18.135	ADP5589_R6			ROW_6
12	J18.159	ADP5589_C4			COLUMN_4	LED_4
13	J18.133	ADP5589_R7			ROW_7
14	J18.161	ADP5589_C5			COLUMN_5	LED_5
15,20,29	-	DGND	Ground
16	J18.147	ADP5589_R0			ROW_0
17	-	VDD	3.3V	ref. voltage
18	J18.145	ADP5589_R1			ROW_1
19	J18.90	JTMS-SWDIO		JTMS-SWDIO
21	J18.98	JTCK-SWCLK		JTCK-SWCLK
22	J18.163	ADP5589_C6			COLUMN_6
23	J18.92	JTDI		JTDI
24	J18.165	ADP5589_C7			COLUMN_7
25	J18.96	JTDO-TRACESWOO		JTDO-TRACESWOO
26	J18.167	ADP5589_C8			COLUMN_8
27	J18.94	NJTRST		NJTRST
28	J18.169	ADP5589_C9			COLUMN_9
30	J18.171	ADP5589_C10			COLUMN_10

• J12

Pin#	SOM Pin#	Pin name	POWER	System control	CAN	I2C	SPI	UART	SAI
1	-	5V_CB	5V
2,4	-	PMIC_3V3	3.3V
3	J18.	PD13							SAI2_SCK_A
5	J18.	PD12							SAI2_FS_A
6	J18.	PB13			FDCAN2_TX
7	J18.	PD11							SAI2_SD_A
8	J18.	PB5			FDCAN2_RX
9	J18.	PG9							SAI2_FS_B
10, 11, 16, 19, 29, 30	-	DGND	Ground
12	J18.	PA12			FDCAN1_TX	I2C5_SDA
13	-	3V3_CB	3.3V
14	J18.	PA11			FDCAN1_RX	I2C5_SCL
15	-	N.C.
17	-	N.C.
18	J18.	PF6					SPI5_NSS	UART7_RX
20	J18.	PF9					SPI5_MOSI	UART7_CTS
21	J18.	NRST		system reset
22	J18.	PF7					SPI5_SCK	UART7_TX
23	J18.	PONKEYn		power key
24	J18.	PF8					SPI5_MISO	UART7_RTS/ UART7_DE
25	J18.	EEPROM_WP		write protect for carrier eeprom
26	J18.	PD6
27	J18.	MEM_WP#		write protect for NAND
28	J18.	PA9

Device usage

CAN

The CAN interfaces need a tranceiver to be connected to the CAN bus.

NOTE: the FDCAN1 pins are shared with touchscreen I2C interface and are not available when using I2C5.

See the CAN page for more informations.

I2C5

Configured by deafult for touchscreen I2C interface.

See the I2C page for more informations.

SPI5

NOTE: these pins are shared with UART7, cannot be used at the same time.

See the SPI page for more informations.

UART7

NOTE: these pins are shared with SPI5, cannot be used at the same time.

See the UART page for more informations.

SAI2

See the Audio page for more informations.

LED driver

Open collector outputs through a 120ohm resistor. Can be drive indicators LEDs

By default all the pins are available.

keyboard matrix

NOTE: COLUMN[0:5] are not available by default as the pins are routed to the LED open collector outputs. Please send an e-mail to helpdesk@dave.eu for custom configurations.

See the IO_expander page for more informations.

Interface membrane

This mambrane can be provided for user interface when the system is mounted on the 4 modules DIN BAR profile, it can offer up to 2 keys and 6 LEDs.

Please send an e-mail to helpdesk@dave.eu for more informations.

JTAG

See the JTAG page for more informations.

System control

See the reset scheme for more informations.

The system control signals are the following:

• system reset
  • tie to ground for reset the system
• power key
  • tie to ground for power up and down the system
• write protect for carrier eeprom
  • tie to ground for write inside the carrier eeprom
  • the first 32 bytes of the eeprom are used to store the CB ConfigID, the corruption of these bytes prevents the system from boot.
• write protect for NAND
  • this pin allow to prevent unwanted writes, tie to ground when the NAND are not to be written.

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