LED7708 datasheet(29/53 Pages) STMICROELECTRONICS

Part #	LED7708

Description	16 channels x 85 mA LED driver with boost controller and 4-wire serial interface

PDF	53 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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29 / 53 page

LED7708

Recommended operating conditions

Doc ID 022698 Rev 1

29/53

8.5

Serial interface

8.5.1

Serial interface architecture

The LED7708 is equipped with a 4-wire serial interface (SI) to allow full control of its

functionalities by the host controller. The LED7708 uses four pins (DIN, DOUT, DCLK and

LE) to connect itself to the serial bus. The serial interface supports a data clock frequency

up to 30 MHz.

Figure 7.

Simplified serial interface block diagram

8.5.2

Serial interface internal registers

The internal registers are organized in control registers and brightness registers. Access to

the desired register is performed by encoding the destination address via a serial key on the

bus (a serial key consists of a certain number of clock pulses during the high-state of the LE

signal). All the internal registers are 16 bits wide.

Table 11.

Internal registers

Control registers

Brightness registers

DEVCFG0

DEVCFG1

GSLAT

CHSTA

CHSEL

BRT01 to BRT16

LED7708 Datasheet(PDF) 29 Page - STMicroelectronics