SLYA068A May   2023  – December 2023 TMAG3001 , TMAG5253

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Low Power Modes
    1. 2.1 Power Cycling
      1. 2.1.1 Self Duty Cycled Low Power Operation
    2. 2.2 Conversion on Demand
    3. 2.3 Wake on Detection
    4. 2.4 Wake on Change
  6. 3Low Power Modes with Multiple Sensors
  7. 4Low Power Mode Design Examples
    1. 4.1 Design Example Scenario 2
    2. 4.2 Design Example Scenario 2
  8. 5Summary
  9. 6References
  10. 7Revision History

4.1 Design Example Scenario 2

In this scenario, take a look at the power savings just from the triggers and thumb sticks, for a 2-hour gaming session. The interactions in a gaming controller are fairly slow in nature, even with expert gamers reaching only up to 10 to 15 clicks per second. For a smooth response, the sensor signals could be sampled at a 10 times higher rate, at up to 100 Hz. Table 4-1 shows the comparison in power savings between two cases, one with power savings enabled using duty cycling, where the sensors are turned on once every 10 ms and the other case without any power savings where the sensors are just turned on continuously. From the analysis, it is seen that by power cycling the sensors at around 100 Hz or every 10 ms, the total system power can be easily reduced by around 100 times.

Table 4-1 Power Savings in System Level for Scenario 1
Scenario 1 No Power savings Power Savings
Duration in Active mode 120 minutes 0.6 minutes
Duration disabled or in sleep mode 0 minutes 119.4 minutes
Average current consumption per thumb stick using 1 TMAG5273 (if 2 magnetic channels are enabled) 2.3 mA 20 μA
Average current consumption per trigger using 1 TMAG5253 2.1 mA 10 μA (with tactive = 50 μs)
Total current consumption of the system with 2 Triggers and 2 Thumb sticks (mWh) 8.8 mA 60 μA