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MC9S12ZVL(32 pin) power consumption problem

Question asked by Hanson He Employee on Aug 29, 2017
Latest reply on Sep 3, 2017 by Hanson He

Below is the power consumption result and connect schematic, if ID1 or  ID2 connect to GND,it will make MCU power increase.

Note, BCTL connect to chip PIN 15.

according to the theoretical value, current will increase I=5V/4.7K=1.06mA,but actually it is I=6.4mA, what will make this happen?

Work mode

ID1 float
ID2 float

ID1->GND
ID2 float

ID1 float
ID2->GND

ID1->GND
ID2->GND

ID1 connect to GND
ID2 connect to GND

NORMAL mode

19.27mA

22.7mA

22.7mA

24.6mA

19.27mA

STOP mode

0.03mA

6.4mA

6.4mA

10.3mA

0.03mA

 

Test result is below.

 

1:Cut Q2R10 component, enter int STOP mode, test current is I1=6.4mA,so the power consumption is not related with these componets. 

2:If we cut off R8  resistance, and enter into STOP mode, the current value is I2=0.03mA,power consumption is normal. 

3:If we do not cut off R8 component, ID1 short to GND,enter into STOP mode,test current is I3=6.3mA.

 

Pls help confirm below.

1. Whether S12ZVL inner LDO output VDDX will make this happen? From the consumption table, we could see, when enter into STOP mode, Ivddx MAX value is 5mA.

2. If remove R7, R8 component, config software as inner pull up, and replace R2 as 1.5K, enter int STOP mode, test current is 0.09mA. Why inner pull up resistance will ok? What is difference between inner and external pull up resistance?

    

 

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