PSoC 6 WiFi-BT Pioneer Kit Guide, Doc. # 002-22677 Rev. *B
69
A.3
PSoC 6 WiFi-BT Pioneer Board Reworks
A.3.1
Bypass Protection Circuit on Program and Debug Header (J11)
The 10-pin header allows you to program and debug PSoC 6 MCU using an external programmer
such as MiniProg3. This header has a protection circuit that cuts-off any voltage greater that 3.4 V on
VTARG_REF pin. This is to ensure that PSoC 6 MCU and other 3.3-V devices do not get damaged
due to overvoltage.
If the external programmer provides a slightly higher voltage, say 3.42 V, and you still need to use
the programmer, you can bypass this protection circuit by populating the bypass zero-ohm resistor
R196.
Note that this change will compromise the protection circuit when an external supply is used and will
permanently damage any 3.3-V device if the external voltage exceeds absolute maximum limit of the
device. See the respective device datasheet for absolute maximum voltage limits.