TIDUEW7 May   2020

 

  1.    Description
  2.    Resources
  3.    Features
  4.    Applications
  5.    Design Images
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Processor – i.MX 6ULL Applications Processor
      2. 2.2.2 i.MX 6ULL Memory Interfaces
        1. 2.2.2.1 DDR3L
        2. 2.2.2.2 Quad SPI NOR Flash
        3. 2.2.2.3 eMMC iNAND
        4. 2.2.2.4 SD Card Connector
      3. 2.2.3 USB to UART Converter
      4. 2.2.4 USB Ports
      5. 2.2.5 LCD Screen Connector
      6. 2.2.6 JTAG Header
      7. 2.2.7 USB2ANY Header
      8. 2.2.8 Functional Switches and Status LEDs
      9. 2.2.9 GPIO Expansion Connector
    3. 2.3 Highlighted Products
      1. 2.3.1 TPS6521815 - Power Management IC
      2. 2.3.2 DP83849I - Dual Ethernet PHY
      3. 2.3.3 INA3221 - Current Monitor
      4. 2.3.4 Reset Scheme
      5. 2.3.5 TPS2054B, TPS22964C - Auxiliary Load Switches
    4. 2.4 System Design Theory
      1. 2.4.1 Power Estimation
      2. 2.4.2 Power Sequencing
      3. 2.4.3 I2C Device Chain
      4. 2.4.4 Clock Scheme
      5. 2.4.5 BOOT Configuration
      6. 2.4.6 PCB Floor Planning
  8. 3Getting Started, Testing Setup, and Test Results
    1. 3.1 Getting Started with Hardware and Software
      1. 3.1.1 Hardware
        1. 3.1.1.1 On-board LED Information
      2. 3.1.2 Software
        1. 3.1.2.1 Booting of TIDA-050043
        2. 3.1.2.2 Example Linux Commands for Testing TIDA-050043
  9. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 CAD Files
    4. 4.4 Gerber Files
    5. 4.5 Assembly Drawings
  10. 5Software Files
  11. 6Related Documentation
    1. 6.1 Trademarks
    2. 6.2 Third-Party Products Disclaimer

3.1.2.2 Example Linux Commands for Testing TIDA-050043

To figure out which I2C devices are on the bus, where "0" means I am looking for I2C devices on channel 0 (because the TPS6521815 should be here at 0x24):

root@timx6y:~# i2cdetect -y -r 0 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- UU -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

To verify dynamic voltage scaling is working for the PMIC with respect to the CPU frequency of the processor, where 792 MHz corresponds to DCDC1 = 1.275 V while 900 MHz corresponds to DCDC1 = 1.325 V:

root@timx6y:~# echo userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor root@timx6y:~# echo 900000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed root@timx6y:~# echo 792000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

To run a current sensor application and measure the current on any rail coming out of the TPS6521815 PMIC, where "1" in the first prompt is current sensor IC #1, "1" in the second prompt is channel 1, and "curr1_input" returns a value of 248 mA that is being used by the VDD_ARM and VDD_SOC rails:

root@timx6y:~# test_currentsensor Enter current sensor no[1-2]: 1 Enter voltage Level[1-3]: 1 /******************************************************************************/ /* CURRENT SENSOR2 */ /* Location of node:/sys/bus/i2c/devices/2-0040/hwmon/h1mon1/ */ /******************************************************************************/ /* ========================================================================== */ /* VDD_SOC_IN */ /* ========================================================================== */ curr1_crit : 16380 mA curr1_crit_alarm : 0 curr1_input : 248 mA curr1_max : 16380 mA curr1_max_alarm : 0 in1_input : 1104 mV /******************************************************************************/

Alternatively, software has been written to set up the LCD screen and use it to display the real-time current monitoring information in addition to displaying the time configured in the real-time clock (RTC) supplied by the coin cell battery and the always-on power supply. Figure 32 shows the LCD screen during power-up, running color configurations tests, and displaying real-time current monitoring with labels and converted values.

Figure 32. Real-time Current Monitoring with LCD ScreenTIDA-050043 050043_218-MX6Y_Photo9-LCD1.gif

There are many other useful functions that are written specifically for testing TIDA-050043 in addition to the thousands of pre-defined Linux commands that can be included as part of the Yocto build for iMX. The most useful one for stress testing the processor and increase load current to test the PMIC is "stress-ng." More information on Linux commands can be found in the Ubuntu manual.