STLUX385ATR datasheet(22/99 Pages) STMICROELECTRONICS

22 / 99 page

Product overview

STLUX385A

22/98

DocID024387 Rev 2

is faster. The wakeup is triggered by the internal AWU interrupt, external interrupt or

reset.

•

Active-halt mode with regulator off: this mode is the same as active-halt with

regulator on, except that the main voltage regulator is powered off, so the wakeup time

is slower.

•

Halt mode: in this mode the microcontroller uses the least power. The CPU and

peripheral clocks are stopped, while main voltage regulator is switched in power-off.

Wakeup is triggered by external event or reset.

In all modes the CPU and peripherals remain permanently powered on, the system clock is

applied only to selected modules. The RAM content is preserved and the brown-out reset

circuit remains enabled.

3.7

Communication interfaces

3.7.1

Digital addressable lighting interface (DALI)

DALI (digital addressable lighting interface), standardized as IEC 929, is the new interface

for lighting control solutions defined by the lighting industry.

The DALI protocol is generally implemented in a DALI communication module (DCM): a

serial communication circuit designed for controllable electronic ballasts. “Ballast” is a

device or circuit used to provide the required starting voltage and operating current for LED,

fluorescent, mercury or other electronic-discharge lamps.

The STLUX385A DALI driver has the following characteristics.

•

Improved DALI noise rejection filter (see section

: DALI noise rejection filter)

•

Speed line:1.2, 2.4 and 4.8 kHz transmission rate ±10%

•

Forward payload: 16, 17, 18 and 24-bit message length

•

Backward payload: 8-bit message length.

•

Bi-directional communications

•

Monitor receiver line timeout 500 ms ±10%

•

Polarity insensitive on DALI_rx, DALI_tx signal line

•

Interoperability with different message length

•

Configurable noise rejection filter on DALI_rx input line

•

Maskable interrupt request line

•

DALI peripheral clock has slowed down to 153.6 kHz in low speed operating mode

DALI noise rejection filter

The STLUX385A DALI interface includes a noise rejection filter interconnected on the RX

channel capable to remove any bounce, glitch or spurious pulse from the RX line. The filter

can be configured via three registers:

•

MSC_DALICKSEL: selects the source clock of filter timing

•

MSC_DALICKDIV: configures the clock prescaler value

•

MSC_DALICONF: configures the filter count and operating mode

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