User Guide
29 of 67
002-32601 Rev. *C
2021-12-02
EZ-
PD™ PMG1 MCU prototyping kits guide
CY7110/CY7111/CY7112/CY7113
EZ-
PD™ PMG1 prototyping kit system design
Figure 22
Overvoltage protection circuit for KitProg3
Q2 MOSFET protects the rest of the circuit from reverse voltage by acting as an open switch for reverse
potential. When KP_VBUS_IN is reverse voltage, Q1 will be OFF, its body diode is reverse-biased, and Q1 acts as
an open switch. For normal potential, Q1 is a closed path.
Q3 is ON during normal operation through R5, and Q2 is OFF. When an overvoltage fault occurs, Q2 turns ON
and pulls up the gate of Q3 to Q2
’s drain voltage
, and turns OFF Q3 to prevent overvoltage from reaching the
rest of the circuit. The diode D3 controls the overvoltage threshold for the circuit.
3.2.4
Power-cycle load switch (CY7110)
The approach to acquire the EZ-
PD™
PMG1-S0 MCU during programming/debugging is different from other EZ-
PD™
PMG1 MCU family devices because the EZ-
PD™
PMG1-S0 MCU does not have a reset pin. Therefore,
KitProg3 uses a power cycling approach to acquire the target in programming/debug mode. It is implemented
using a load switch (U2) which is controlled by the KitProg3 to toggle the power to the EZ-
PD™
PMG1-S0 MCU.
Figure 23
Power cycle load switch
