PSoC™ 6 Wi-Fi Bluetooth® pioneer kit guide, Document Number. 002-22677 Rev. *I
47
Hardware
3.3
PSoC™ 6 Wi-Fi Bluetooth
®
pioneer board reworks
3.3.1
Bypass protection circuit on program and debug header (J11)
The 10-pin header allows you to program and debug the PSoC™ 6 MCU using an external
programmer such as MiniProg4. 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 the PSoC™ 6 MCU and other 3.3-V devices do
not get damaged due to overvoltage.
Figure 3-9. Schematics of Bypass protection circuit on program and debug header (J11)
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.
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