Brownout avoidance

Abstract

Examples of the disclosure are directed to methods of managing power of various modules of an electronic device to prevent the voltage of the battery from falling to an undervoltage lockout (UVLO) threshold. In some examples, software operating on the electronic device or an associated electronic device (e.g., a paired electronic device) may assign power budgets to one or more modules, thereby preventing each module from drawing its maximum current capacity and causing the battery's voltage level to fall to the UVLO threshold. In some examples, a pre-UVLO threshold (i.e., a threshold higher than the UVLO threshold) may be used to modify the states of one or more modules to save power as the voltage of the battery approaches the UVLO threshold, but before the device must be fully powered off.

1 . (canceled) 
     
     
         2 . A method comprising:
 at an electronic device including a first module, a sensor configured to detect presence of a user at the electronic device, and a power supply:
 receiving a first power request for the first module; 
 determining, using the sensor, whether a user is present at the electronic device; 
 assigning a respective power budget to the first module based on the determination of whether the user is present at the electronic device, wherein:
 in accordance with a determination that the user is present at the electronic device, the respective power budget is a first respective power budget, and 
 in accordance with a determination that the user is not present at the electronic device, the respective power budget is a second respective power budget, different than the first respective power budget; and 
 
 drawing power at the first module based on the respective power budget. 
   
     
     
         3 . The method of  claim 2 , wherein determining that the user is present at the electronic device corresponds to the electronic device being in a pocket of the user. 
     
     
         4 . The method of  claim 2 , wherein determining that the user is present at the electronic device corresponds to the electronic device being on an arm of the user. 
     
     
         5 . The method of  claim 2 , wherein determining that the user is present at the electronic device corresponds to the electronic device being in a hand of the user. 
     
     
         6 . The method of  claim 2 , wherein the sensor comprises a light sensor. 
     
     
         7 . The method of  claim 2 , wherein the sensor comprises a heat sensor. 
     
     
         8 . The method of  claim 2 , wherein the sensor comprises a motion sensor. 
     
     
         9 . The method of  claim 2 , wherein the sensor comprises a touch sensor. 
     
     
         10 . The method of  claim 2 , wherein the second respective power budget is less than the first respective power budget. 
     
     
         11 . The method of  claim 2 , wherein the first module comprises a haptic feedback module. 
     
     
         12 . An electronic device comprising:
 a first module;   a sensor configured to detect presence of a user at the electronic device;   a power supply;   one or more processors; and   memory storing one or more instructions, which when executed by the one or more processors, cause the electronic device to perform a method comprising:
 receiving a first power request for the first module; 
 determining, using the sensor, whether a user is present at the electronic device; 
 assigning a respective power budget to the first module based on the determination of whether the user is present at the electronic device, wherein:
 in accordance with a determination that the user is present at the electronic device, the respective power budget is a first respective power budget, and 
 in accordance with a determination that the user is not present at the electronic device, the respective power budget is a second respective power budget, different than the first respective power budget; and 
 
 drawing power at the first module based on the respective power budget. 
   
     
     
         13 . A non-transitory computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by an electronic device including a first module, a sensor configured to detect presence of a user at the electronic device, and a power supply, cause the electronic device to perform a method comprising:
 receiving a first power request for the first module;   determining, using the sensor, whether a user is present at the electronic device;   assigning a respective power budget to the first module based on the determination of whether the user is present at the electronic device, wherein:
 in accordance with a determination that the user is present at the electronic device, the respective power budget is a first respective power budget, and 
 in accordance with a determination that the user is not present at the electronic device, the respective power budget is a second respective power budget, different than the first respective power budget; and 
   drawing power at the first module based on the respective power budget.