LED2472GQTR datasheet(24/39 Pages) STMICROELECTRONICS

24 / 39 page

Digital blocks

LED2472G

24/39

DocID024620 Rev 3

Figure 13. Different color sequence in data loading

8.9

Gain register

The LED current can be programmed using an external resistor connected to GND from R-

EXT pin and can be adjusted using the dedicated bits of the gain register (G-0 to G-17

defines the gain and CFG-0/1/2 the current range within the gain can be adjusted). The

device can regulate the current up to 72 mA and down to 4 mA. To change anything in the

gain register, a 24-bit digital word must be sent (CFG-0 represents the LSB, CFG-23 the

MSB). The accuracy of the LED current depends on the selected range and it is assured

only in the ranges indicated in the static electrical characteristics (see Table 5).

Table 11. Gain register

BIT

Definition

Attribute

read/write

Default

G-0

RED current gain

adjustment

R/W

6-bit DAC allows adjustment of the device

output current in 64 steps for each range

(defined by CFG-0).

default: gain = 1

G-1

G-2

G-3

G-4

G-5

G-6

GREEN current

gain adjustment

R/W

6-bit DAC allows adjustment of the device

output current in 64 steps for each range

(defined by CFG-1).

default: gain = 1

G-7

G-8

G-9

G-10

G-11

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