STLED325 datasheet(43/62 Pages) STMICROELECTRONICS

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STLED325

Commands

Doc ID 17576 Rev 1

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Commands

A command sets the display mode and status of the LED driver.

The first 1 byte input to the STLED325 through the SDA pin after the slave address is

regarded as a command. If slave address is not transmitted before the commands/data are

transmitted, the commands/data being transmitted are invalid (however, the commands/data

already transmitted remain valid).

7.1

Configuration mode setting command

This command initializes the STLED325 and performs any one of the following functions:

i) Selects the duty factor (1/8 to 1/16 duty factor). When this command is executed, display

is turned off. To resume display, the display ON command must be executed. If the same

mode is selected, nothing is performed.

ii) Selects the remote control protocol to use.

iii) Sets the guard timer. The guard timer is configurable from 1 to 15s or turned off

completely.

iv) Sets the guard timer action to perform when the guard timer counts. Two actions are

allowed: no action or set STBY to high level.

Bits b7-b6 = 00 is decoded as a configuration mode setting command. The subsequent bits

are de-coded as follows:

b5: enables wake-up from the external WAKE_UP pin

b4: enable for the display configuration setting change (number of digits)

b3: allows display of RTC (during normal or STBY modes)

b2: enables all RC keys as hot-keys

b1: enables all FPK keys as hot-keys

b0: enables the Guard Timer to issue STBY once the timer expires

Note:

When displaying the RTC during normal mode, if the µP is writing data to STLED325 using

I2C bus, the RTC display on LED momentarily turns off.

The first byte after the configuration command is in the following format:

Remote control protocol setting (bits b6-b4)

000: RC Disabled (default)

MSB

LSB

MSB

LSB

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