SDA datasheet(26/29 Pages) EXAR

26 / 29 page

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Rev. 1.0.1

By clicking on the Flash button, user will start

programming

sequence

the

design

configuration into the Flash NVM. After the

programming sequence completes, the chip

will reset (if automatically reset After Flashing

box is checked), and boot the design

configuration from the Flash.

For users that wish to create their own

programming procedure so they can re-

program Flash in-circuit using their system

software, please contact Exar for a list of I2C

Flash Commands needed.

During a design process a user might want to

repeatedly download a design configuration

onto run time registers without saving it in

Flash. This is done through PA5 as well.

ENABLING XRP7724

XRP7724 has a weak internal pull-up ensuring

it gets enabled as soon as internal voltage

supplies

have

ramped up

and

are

regulation.

Driving the Enable pin low externally will keep

the controller in the shut-down mode. A

simple

open

drain

pull

down

the

recommended way to shut XRP7724 down.

If the Enable pin is driven high externally to

control XRP7724 coming out of the shut-down

mode, care must be taken in such a scenario

to ensure the Enable pin is driven high after

Vcc gets supplied to the controller.

In the configuration when Vcc = LDO5 =

4.75V to 5.5V, disabling the device by

grounding

the

Enable

not

recommended. At this time we recommend

leaving the Enable pin floating and placing the

controller in the “Standby Mode” instead in

this scenario. The standby mode is defined as

the state when all switching channels and

LDO3.3 are disabled, all GPIO/PSIOs are

programmed as inputs, and system clock is

disabled. In this state chip consumes 440uA

typical.

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