Cypress AN200210, Начало работы

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Getting Started with EZ-
PD™ CCG3
www.cypress.com
Document No. 002-00210 Rev. *A 28
Figure 25. Message Showing Configuration Parameters Successfully Updated
4. Reset the CY4531 CCG3 EVK. This can be done by cycling the power to the kit or by pressing the reset switch
SW1 on the CCG3 daughter card in order to reflect the modified configuration on the CCG3 device.
5. As mentioned previously, in the CCG3 application firmware, two copies of the firmware (FW1 and FW2) are used
for fail-safe operation. One is called the running firmware and the other is called the alternate firmware. As shown
in
Figure 19 , FW2 is the one that will be read because the Bootloader Read option is checked, which reads the
running firmware. As shown in Figure 24 , since Normal Flashing option is selected, the EZ-PD Configuration
Utility updates the alternate firmware while the running firmware is being executed. Hence, it updates FW1 in this
example. After the flash configuration is updated successfully and the device is reset, the CCG3 device
bootloader is designed in such a way that the last updated firmware image becomes the running firmware.
Hence, when the configuration table is read back as shown in
Figure 26 with the Bootloader Read option
selected, the FW1 image will be read, which is the firmware copy that was updated.
6. Repeat steps 4 and 5 of the Modify Configuration Parameters Using EZ-PD Configuration Utility section in order
to read back the updated configuration table from the CCG3 device and verify. Notice that as shown in Figure 19 ,
FW2 was read, as shown in Figure 24 , FW1 was updated, and after recycling power from step 4 above, FW1 will
be read as shown in Figure 26 .
7. As shown in Figure 27 , it can be seen that the CCG3 device of the CY4531 CCG3 EVK now only supports four
sink PDOs listed as PDO 0
– 3, and not five PDOs as shown in
Figure 20 earlier. Also note that PDO 2 no longer
supports the power profile of 14.8V, 900mA.