#9604 NORM 1.5-sof: build DC sensor mode on audio driver

[Zarro Boogs per Child]

#9604: build DC sensor mode on audio driver
--------------------------------+-------------------------------------------
           Reporter:  Quozl     |       Owner:  dsd              
               Type:  defect    |      Status:  new              
           Priority:  normal    |   Milestone:  1.5-software-beta
          Component:  kernel    |     Version:  not specified    
         Resolution:            |    Keywords:                   
        Next_action:  diagnose  |    Verified:  0                
Deployment_affected:            |   Blockedby:                   
           Blocking:            |  
--------------------------------+-------------------------------------------

Comment(by Quozl):

 At a 'DC Input Bias'' of 80%, the short circuit current emitted by XO-1.5
 microphone input is 0.732mA, at an open circuit voltage of 2.6V, this
 implies by ohms law an internal series resistance of 3552 ohms.  With ''DC
 Input Bias'' dropped to 50%, the current emitted is 0.442mA, at 1.7V,
 which means 3846 ohms.  Perhaps there is a 3k6 resistor in the path.

-- 
Ticket URL: <http://dev.laptop.org/ticket/9604#comment:12>
One Laptop Per Child <http://laptop.org/>
OLPC bug tracking system