AN4461 datasheet(59/70 Pages) STMICROELECTRONICS

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AN4461

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 STEVAL-ILL066V1 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 STEVAL-

ILL066V1 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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