SLOA194A May   2014  – January 2022 DRV2603 , DRV2604 , DRV2604L , DRV2605 , DRV2605L , DRV2605L-Q1 , DRV2624 , DRV2625 , DRV2667

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Eccentric Rotating Mass
    2. 1.2 Linear Resonant Actuator
    3. 1.3 Piezo Actuator
  3. 2How to Measure Energy
    1. 2.1 Current Consumption
    2. 2.2 Energy Consumption
    3. 2.3 Current Versus Acceleration
  4. 3Energy Consumption Comparisons for ERM, LRA and Piezo
  5. 4Energy Consumption Advantage of DRV260x and DRV262x Drivers
  6. 5Appendix A Energy Consumption of Actuators
  7. 6Appendix B. Test Setup Picture
  8. 7Appendix C. Energy Consumption Calculation for Smartphone Scenarios
  9. 8Revision History

7 Appendix C. Energy Consumption Calculation for Smartphone Scenarios

This section shows how to use the data of Figure 3-1 to calculate the smartphone scenarios.

  1. Phone call-15 times a day
    • Dial phone numbers: Assume the user dials 10 numbers in each phone call. There are a total of 150 clicks.
    • Receive phone calls: Assume each phone call received has 12 buzzes, every 2 buzz combines a ringing. There are a total of 180 buzz effects.
  2. Text Message-15 times a day
    • Write a text message: Assume 40 words in each text message, each word combines 5 characters. There are a total of 3000 clicks.
    • Receive a text message: Assume there are 4 alerts when receiving a text message. There are 60 alerts in total.
  3. Email-5 times a day
    • Reply to an email: Assume there are 60 words in each email, each word combines 5 characters. There are a total of 1500 clicks.
    • Receive an email: Assume each text message received has 4 alerts. There are 20 alerts in total.
  4. Reminding-10 times a day
    Assume each reminder consists of 10 alerts and 10 buzzes.
  5. Games-60 minutes a day
    Different games use different effects, so just assume they include the following effects in 10 minutes and games are played for one hour each day.
    • Bump: 100 times
    • Click: 500 times
    • Pulse: 200 times
    • Alert: 150 times
    • Buzz: 20 times
  6. Social media- 60 minutes a day
    Assume there are the following effects in 10 minutes, and then interpolate the data for 60 minutes.
    • Bump: 70 times
    • Click: 400 times
    • Pulse: 80 times
    • Alert: 60 times
    • Buzz: 12 times
  7. Other- 60 minutes a day, including search, web, news, clock
    Assume there are following effects and people consumed the total time of one hour on these actions.
    • Bump: 720 times
    • Click: 2400 times
    • Pulse: 360 times
    • Alert: 312 times
    • Buzz: 78 times

Standby energy consumption

The typical DRV260x driver standby current is 1.9 µA while the typical for the DRV262x driver is 1.55 µA , and the DRV2667 (Piezo driver) standby current is 10 µA. For one day the energy consumption of ERM and LRA drivers is 45.6 µAh or 37.2 µAh for DRV260x or DRV262x respectively, and Piezo driver is 240 µAh.