k66 RESET_b is pulled down by chip

cancel
Showing results for 
Search instead for 
Did you mean: 

k66 RESET_b is pulled down by chip

286 Views
1043064987
Contributor I

I use Jlink commander "unlock kinetis" but it time out.

There's only one 4.7k pull up resistor on RESET_b but it always at 30mV. 

Labels (1)
Tags (1)
0 Kudos
5 Replies

173 Views
myke_predko
Senior Contributor III

Hiya,

How are you connecting the other JTAG pins?  

A couple of notes:

myke

0 Kudos

173 Views
1043064987
Contributor I

Hi Myke,

Thanks for your notes. But when TMS is open, TMS is 3.3V. And after EZ_CS_b is left open, the RESET_b changes to 0.2V.(no longer 30mV)

0 Kudos

173 Views
myke_predko
Senior Contributor III

Hiya,

Can\ you put in a drawing of your programming circuit and the different signal levels?  

Attached is the circuit I use for programming to the Segger JLink Plus (should be the same connections as you use) and the Segger Needle connector:

2020.07.07 - Programming adapter.jpg

Just a couple of notes:

  • /UC_RST is pulled up and has a voltage supervisor on it.  
  • EZP_CS_b is left floating

myke

0 Kudos

173 Views
1043064987
Contributor I

Hi,

   Thank you. Finally, I solder a new one and it's all right. Maybe when I soldered the last one, temperature was so high and burn the chip.

0 Kudos

173 Views
myke_predko
Senior Contributor III

Good news - keep us updated as to your ptogress!

0 Kudos