Datasheet

NXP Semiconductors

UM11193

KITFS85AEEVM evaluation board

User manual Rev. 2.1 — 30 January 2019

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Figure 24. Main panel

Figure 24 shows the mode selection. At first launch, the FlexGUI starts in User mode.

The user can then decide to switch to Test mode using the Switch mode drop-down list

followed by clicking Apply.

The GUI-Device Status field checks the connection from MCU to the device. The

ONLINE status indicates a good connection, while ERROR status indicates an issue

(e.g. V

SUP

is not provided to the device).

The SPI/I2C communication bus can be changed at any time using the drop-down list.

This change is managed by the onboard MCU to communicate with the desired bus.

It is also possible to change the clock frequency using this panel.

Note that in the case of I2C, most of the time, the default address used by the device are

0x20 for main and 0x21 for the fail-safe.

The I2C address is managed differently in Debug and Normal mode

• Debug mode :

– I2C address when debug mode pin is set to 5.0 V are 0x20 for main and 0x21 for fail-

safe.

– The user can change this address in the mirror register. The new address is taken

into account only after debug pin is released to 0 V.

• Normal mode:

– The address is burned in the OTP.

The user can read in which mode the device is operating. It is also possible to switch

from user mode to test mode (and vice-versa).

The current operating mode is refreshed periodically by default at FlexGUI startup. This

automatic refresh can be disabled by disabling Poll button as shown in Figure 25.