LED2472G datasheet(21/39 Pages) STMICROELECTRONICS

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LED2472G

Digital blocks

8.3

Current ranges (CFG 0-CFG 2)

The output LED currents can be programmed using an external resistor connected to GND

from the ISET pin and can be adjusted using 6 bits in a dedicated gain register with two

possible current ranges selectable in the configuration register. Each range can be

separately selected for each color by the bits CFG-0, CFG-1 and CFG-2, respectively, for

the RED, GREEN and BLUE channels.

8.4

Error detection conditions (CFG 3-CFG 5)

During error detection phases for each channel, the following are checked:

–

output current for open circuit detection

–

output voltage for short-circuit detection

The thresholds for the error diagnostics are summarized in the Table 9:

8.5

Auto power shutdown / wakeup (CFG 6)

This feature reduces the power consumption when all outputs are OFF. It is active when the

bit CFG-6 of the configuration register is at “1”. The auto power shutdown (auto OFF) starts

when the data latched is “0” for all channels, and the device will be active again (wakeup) at

the first latched data string including at least one bit equal to “1” (at least one channel ON).

CFG-9

Data flow

R/W

Color data flow

management

CFG9 CFG10 CFG11

RGB

GBR

CFG-10

GRB

BGR

CFG-11

BRG

RBG

CFG

12 ÷ 23

Don’t care

Table 8. Configuration register (continued)

BIT

Definition

Attribute

read/write

Configuration register function description

Default

Table 9. Diagnostic thresholds

Error detection

Checked malfunction

CFG-x(1)

Thresholds

Open detection

combined mode

Open line or output short to GND

Don’t care

Io < 0.5 x Io_programmed

Short detection

Short on LED or short to VLED

Vo > 2 V

Vo > 3 V

x=3 for RED, x=4 for GREEN, x=5 for BLUE

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