LED1642GWTTR datasheet(20/42 Pages) STMICROELECTRONICS

20 / 42 page

Configuration register

LED1642GW

20/42

DocID024395 Rev 6

The Table 9 shows an example of the current setting with an external resistance (REXT) = 11

Ω:

The Table 10 shows an example of current setting and gain control with REXT = 11 kΩ, see

also Figure 10.

The external programming resistance must be connected as close as possible to the related

device pins (REXT and GND) to reduce as minimum as possible the routing length and

prevent reference noise injection and electromagnetic interferences. Moreover, a direct

connection to the device GND pin reduces the possible output current variation when the

total device ground current changes (load effect).

Table 9. Example of current ranges

REXT [KΩ]

CFG-6

CFG-0 to CFG-5

LED current(1) [mA]

The indicated values may be slightly different on the current device.

Accuracy

Low range

000000

3.1 mA

± 4% ch-to-ch

111111

12.5 mA

High range

000000

8.9 mA

011010

20 mA

± 3% ch-to-ch

Table 10. Gain steps for the current range selected by REXT = 11 kΩ

CFG-6

CFG(0 to 5)

LED current (1) [mA]

The indicated values may be slightly different on the current device.

Low range

000000

3.131

000001

3.280

……

…

111111

12.524

High range

000000

8.945

000001

9.371

……

…

111111

35.78

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