SMARC T335x Carrier Board Hardware Design Guide, Document Revision 1.2
Table of Contents
CHAPTER 1 INTRODUCTION ........................................................................................................... 10
1.1 ACRONYMS AND ABBREVIATIONS USED ............................................................................ 11
1.2 SIGNAL TABLE TERMINOLOGY ............................................................................................. 14
1.3 DOCUMENT AND STANDARD REFERENCES ....................................................................... 17
1.4 INTENDED AUDIENCE ............................................................................................................... 19
CHAPTER 2 INTERFACES ................................................................................................................. 21
2.1 SMARC T335X CONNECTOR PIN MAPPING ........................................................................ 30
2.2 ETHERNET INTERFACE ............................................................................................................ 32
2.3 USB INTERFACE .......................................................................................................................... 45
2.4 PARALLEL RGB LCD INTERFACE .......................................................................................... 55
2.5 SD/SDIO INTERFACE .................................................................................................................. 71
2.6 I2S AUDIO INTERFACE .............................................................................................................. 76
2.7 CAN BUS INTERFACE................................................................................................................. 80
2.8 SERIAL COM PORT INTERFACE ............................................................................................. 85
2.9 SPI INTERFACE ............................................................................................................................ 90
2.10 I2C BUS INTERFACE ................................................................................................................. 95
2.11 SELECTING THE BOOT MODE .............................................................................................. 99
2.12 WATCHDOG CONTROL SIGNALS ....................................................................................... 101
CHAPTER 3 POWER DESIGN GUIDELINE ................................................................................ 104
3.1 POWER SIGNALS ...................................................................................................................... 104
3.2 RTC BATTERY ............................................................................................................................ 108
3.3 POWER FLOW AND CONTROL SIGNALS BLOCK DIAGRAM ....................................... 109
3.4 POWER STATES ......................................................................................................................... 111
3.5 POWER SEQUENCES ................................................................................................................ 112
3.6 LAYOUT REQUIREMENTS ...................................................................................................... 116
3.7 REFERENCE SCHEMATICS .................................................................................................... 117
CHAPTER 4 FLOOR PLANNING THE PCB ................................................................................ 120
4.1 CARRIER CONNECTOR ........................................................................................................... 120
4.2 MODULE AND CARRIER CONNECTOR PIN NUMBERING CONVENTION ................ 123
4.3 MODULE OUTLINE – 82MM X 50MM MODULE ................................................................ 123
4.4 MODULE “Z” HEIGHT CONSIDERATION ........................................................................... 125
4.5 CARRIER BOARD CONNECTOR PCB FOOTPRINT .......................................................... 126
4.6 MODULE AND CARRIER BOARD MOUNTING HOLES – GND CONNECTION........... 127
4.7 CARRIER BOARD STANDOFFS .............................................................................................. 127
