User Guide
23 of 26
002-34123 Rev. **
2021-10-21
CY4534 EZ-
PD™ barrel connector replacement
-plus (BCR-PLUS)
evaluation kit guide
Kit operation
7.
Short J6 pin 1 and pin 2 to disable the legacy charging support for all protocols other than BC1.2 for the
BCR-PLUS device.
8.
Set the VBUS_MAX rotary switch (SW1) to position 1. Reconnect the power adapter using the USB-A to Type-
C cable. Verify that the multimeter displays a voltage between 4.5 V and 5.5 V. Disconnect the power adapter
after this is verified.
9.
Set the VBUS_MAX rotary switch (SW1) to position 2. Reconnect the power adapter and verify that the
multimeter displays a voltage between 4.5 V and 5.5 V. This is because the BC1.2 protocol can only support a
typical voltage of 5 V on VBUS.
3.3
EVK behavior under mismatched capabilities
If the attached USB Type-C power adapter can supply a VBUS voltage within VBUS_MIN and VBUS_MAX limits,
the CY4534 EZ-PD
™
BCR-PLUS EVK will turn the load switch ON to pass the voltage onto the DC_OUT terminal
block (J2).
On the other hand, if the attached power adapter does not have a matching voltage/current combination, the
BCR-PLUS device will indicate a capability mismatch to the power adapter and will turn the load switch OFF.
See
VBUS voltage and current selectors
Under mismatch conditions, the red LED2 for FAULT turns ON, the main 5 A load switch is turned off, a 5 V
contract is negotiated with the Type-C power adapter and the 5 V available on the VBUS power rail is routed to
the SAFE_5V test point by turning on the 1 A load switch. See
Fault LED and VBUS-powered LED
for details.
