AN4382 datasheet(59/70 Pages) STMICROELECTRONICS

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AN4382

User interface

9.5

0 - 10 V interface

The 0 - 10 V interfaces can be enabled using the “in” command described in Section 9.3 on

page 46

. By default, the STEVAL385LEDPSR demonstration board is shipped with the

0 - 10 V interface disabled. The 0 - 10 V and DALI interfaces are mutually exclusive.

The 0 - 10 V reference signal can be generated via a 0 - 10 V generator. Alternatively, it is

possible to simulate the signal using a potentiometer. The correct value of this

potentiometer is 110 K

Ω, which can be obtained using two potentiometers in series: 10 KΩ

plus 100 K

Ω. The 100 KΩ potentiometer shall be used when the output voltage is over 5 V,

while the 10 K

Ω potentiometer can be used when the output voltage is below 5 V.

The power necessary to read the input voltage is automatically generated by the

STEVAL385LEDPSR demonstration board. This solution provides excellent insulation and

all the features of the demonstration board. The maximum 0 - 10 V interface input voltage

accepted on this is 15 V.

The on/off transaction is regulated via a hysteresis mechanism. LEDs are switched off when

the 0 - 10 V interface reaches V < 1 V. LEDs are switched on when V > 1.25 V.

The relationship between the voltage applied to the 0 - 10 V interfaces and the LED output

current is defined in Table 21.

Table 21. 0 - 10 V voltage to output current

Voltage applied to connector J9

Output current (1 A scale)

Output current (500 mA scale)

More than 10 V and less then 15 V

1 A

500 mA

10 V

1 A

500 mA

9 V

900 mA

450 mA

8 V

800 mA

400 mA

7 V

700 mA

350 mA

6 V

600 mA

300 mA

5 V

500 mA

250 mA

4 V

400 mA

200 mA

3 V

300 mA

150 mA

2 V

200 mA

100 mA

1 V

100 mA

50 mA

Below 1 V

Off

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