LED7708TR datasheet(37/53 Pages) STMICROELECTRONICS

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LED7708

Recommended operating conditions

Doc ID 022698 Rev 1

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8.5.9

CHSEL register

The CHSEL register is a readable/writable configuration register. Every bit of this register

allows the user to enable/disable the channels. Independent control of the channels (e.g.

scrolling backlight or phase shift) can be achieved by acting on this register.

8.5.10

CHSTA register

The CHSTA register is a read only status register. Each bit of this register shows the status

of the corresponding channel. After the error detection sequence takes place, the channels

which have an excessive voltage drop (LED short-circuit) or that are unable to regulate the

nominal current (open channels) are tagged as faulty and the related CHSTA bits are

asserted.

The CHSEL register is not affected by the error detection sequence. The channels disabled

by clearing the corresponding bits of the CHSEL register are not involved in the error

detection and the corresponding bits of the CHSTA register are forced low. The CHSTA

Table 17.

CHSEL register

Bit

Position

Attribute

Meaning

CHSEL0 to

CHSEL15

R/W

1= the corresponding channel is active.

0= the corresponding channel is disabled.

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