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Content
1．NXP i.MX6ULL chip introduction...................................................................................................1
2. WT-SOM6ULX schematic and testing description...........................................................3
2.1 WT-SOM6ULX diagram and shematic .................................................................................................3
2.2 WT-SOM6ULX power management.....................................................................................................4
2.3 i.MX6ULL related power supply domain’s ripple test ....................................................................4
3．Based WT-SOM6ULX’s baseboard power system design..........................................5
3.1 Core boards power on sequence and typical supply circuit ....................................................5
3.2 About reset ....................................................................................................................................................6
3.3 ON/OFF and wakeup .................................................................................................................................7
4. Startup related circuit design ....................................................................................................................7
4.1 Startup mode and stardup device.........................................................................................................7
4.2 Other startup related hardware notice .......................................................................................... 10
5．TF/SD card circuit design ............................................................................................................. 10
6．LCD interface circuit........................................................................................................................... 11
7．Touch screen interface circuit...................................................................................................... 12
7.1 Resistive TP circuit.....................................................................................................................................13
7.2 Capacitive TP.............................................................................................................................................. 13
8. IIC interface................................................................................................................................................14
9. USB interface............................................................................................................................................. 15
10. Ethernet interface................................................................................................................................. 16
11. Serial port................................................................................................................................................... 19
12. Audio interface.......................................................................................................................................20
13. RTC circuit................................................................................................................................................. 21
14. PWM............................................................................................................................................................. 21
15. SPI ..................................................................................................................................................................21
16. CAN bus..................................................................................................................................................... 22
17. CSI camera interface........................................................................................................................... 23
