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AN4382 Datasheet(PDF) 8 Page - STMicroelectronics |
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AN4382 Datasheet(HTML) 8 Page - STMicroelectronics |
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8 / 70 page  Getting started with STEVAL385LEDPSR demonstration board AN4382 8/70 DocID025437 Rev 1 Caution: The user shall observe the correct string polarity as reported on the PCB. An incorrect LED connection may damage the LED due to the high inverse voltage The board supports a wide range AC input (J8 connector) and operates within the range 90 VAC - 265 VAC. This makes the board suitable to be connected directly into mains. The board also supports, on the same connector J8, a DC voltage comprised between 170 V and 350 V. The AC or DC connection to J8 is shown in Figure 3. The STEVAL385LEDPSR demonstration board offers 3 different communication channels: DALI, 0 - 10 V and a serial interface. The DALI and 0 - 10 V interface share the same STLUX385A pins and are therefore mutually exclusive. The active line is selected via serial line commands. The DALI interface can be controlled by any DALI master compliant with the IEC62386-201 standard. When the DALI protocol is used, the DALI bus must be connected before starting the application. An absence of the DALI line (OPEN DALI) for more than 500 mS from power-up causes the DALI interface to be disabled. When using the DALI interface, it is recommended that the DALI master is already “up and running” before connecting the board. The DALI connector is J3, it has no polarity and it is also isolated from the power stage. The DALI command set implemented on this board is described in Chapter 9.2 on page 42. An isolated 0 - 10 V interface can be activated alternatively to the DALI bus when the DALI protocol is not required or is unavailable. The 0 - 10 V interface connector is J9 and is polarized. A voltage below 1 V powers off the output LED strings. A voltage starting from 1 V to 10 V drives the output current from 10% to 100% of the maximum rated value, in a linear fashion. A voltage between 0 V and 1 V switches off the LED. The serial line is accessible via the J2 connector and is isolated from the power stage. A dedicated USB cable (e.g. TTL-232R-3V3 from FTDI) can be used to connect a personal computer with the serial interface and control the board using a terminal emulator software such as hyperterminal. The 2.54 mm connector of the USB cable shall be linked to the board so that the black wire is connected to the J2, pin1. The serial input allows the user to interact with the board in parallel with the DALI bus. When the 0 - 10 V interface is selected, the output current is regulated only via the 0 - 10 V interface and no changes are allowed via the serial line. The serial line command set is described in Chapter 9.3 on page 46. The STEVAL385LEDPSR can be set in a very low-power state, named IDLE, when the LEDs are switched off via DALI commands. During this state all operations are halted until a new DALI command is received or the DALI_RDY button is pushed. The serial line also stops to be active during the low-power mode. |
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