stled325 STMicroelectronics, stled325 Datasheet - Page 43

• Manufacturer Part Number: stled325
• Description: I?c Interfaced, Advanced Led Controller/driver With Keyscan, Standby Power Management And Real Time Clock Rtc
• Manufacturer: STMicroelectronics

STLED325
7
7.1
Note:
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).
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
When displaying the RTC during normal mode, if the µP is writing data to STLED325 using
I
The first byte after the configuration command is in the following format:
Remote control protocol setting (bits b6-b4)
000: RC Disabled (default)
2
C bus, the RTC display on LED momentarily turns off.
MSB
MSB
b7
0
b6
0
b5
b5
Doc ID 17576 Rev 1
b4
b4
b3
B3
b2
b2
b1
b1
Commands
LSB
LSB
b0
b0
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