STLED325 datasheet(54/62 Pages) STMICROELECTRONICS

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State

STLED325

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Doc ID 17576 Rev 1

State

8.1

Default state upon power-up

Table below shows the default state of the STLED325 upon power-up.

8.2

Initial state

On power application, the 10/16-pulse width is set and the display shows the value

configured in the LED display RAM before entering the standby mode. Thus if TUNE is

required to be shown on the LED upon wake-up, then the user must write the corresponding

digit and segments locations in the LED display memory before going into the standby mode

of operation. The value of the display changes only after user configuration.

If the user wishes to display the RTC value during standby, then the user must configure the

STLED325 by sending the appropriate command. If the user does not configure the

STLED325 to display the RTC in standby, the LED shows the same value as was written

previously in the LED display memory location.

Note that all the hot keys are disabled on power-up. Only the hot-keys (FP or RC) can be

detected to wake-up the system from standby condition.

Table 30.

Power-up defaults

Serial number

Function

Default state

Display

OFF

Key-scan

3IR

Disabled

Display mode

8 segment/1 digit

Display address

10H with address increment

mode

RC protocol

Disabled

Dimming

10/16 duty factor

Hot keys (IR and FP)

Disabled

Guard timer

10s

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