LED7708 datasheet(7/53 Pages) STMICROELECTRONICS

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LED7708

Pin function

Doc ID 022698 Rev 1

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Pin function

Figure 2.

Pin connection (through top view)

Table 2.

Pin description

Function

VSI

Serial interface (SI) core and digital I/O buffer supply input. Connect to LDO3 or to an

external supply (3 V-5 V). Insert a 100 nF bypass ceramic capacitor between this pin and

SGND. Connect to the host controller’s supply when possible.

GSSY

Grayscale synchronization output or VSYNC input. When the internal dimming generation

is set, a pulse at the end of each dimming cycle is provided for data stream

synchronization. Also used as dimming synchronization input to lock the dimming cycles

on the vertical sync pulses.

DIN

Serial interface data input.

DOUT

Serial interface data out.

DCLK

Serial interface data clock.

Serial interface latch enable.

7GSCK

Grayscale clock I/O. When the internal dimming oscillator is used, the grayscale clock is

provided at this pin. The pin becomes the grayscale clock input if the internal dimming

oscillator is disabled (see FOSC pin).

XFLT

Fault signal, open drain output. The pin goes low when a faulty condition occurs.

9IOK

Channel current OK handshake I/O. Used for extended output voltage regulation in multi-

device applications. Used by slave devices to request a higher output voltage to the

master. A 100 k pull-up resistor to LD03 is required.

XVOK

Channel voltage OK I/O (inverted). Used for extended output voltage regulation in multi-

device applications. Used by slave devices to request an output voltage reduction to the

master. A 100 k pull-up resistor to LD03 is required.

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