ISL97632 データシートの表示（PDF） - Renesas Electronics

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ISL97632

LED Driver with 1-Wire Dimming

Renesas Electronics 

ISL97632

Single-Wire Serial Interface

30µs

'1'

'0'

'1'

100µs

'0'

'0'

220µs

'LOAD'

0

200

400

600

800

1000

FIGURE 1. 1-WIRE XSD INTERFACE

The ISL97632 uses a simple single-wire serial interface for

programming the output brightness of the LEDs. A 5-bit

interface is used to give a total of 32 levels of output

brightness. The interface uses a normally high connection for

use with open-drain driving schemes and Intersil’s proprietary

1-Wire XSD bus. When held low for between 15µs and 45µs,

the interface registers a logic 1. When held low for between

90µs and 120µs the interface registers a logic 0. When held

low for greater that 215µs, the interface loads the last 5 bits

into the brightness control register and updates the brightness

level. The required minimum high time is 3µs. This simple

single-wire programming is summarized as follows:

• Logic 0 = Negative pulse >90µs and <120µs

• Logic 1 = Negative pulse >15µs and <45µs

• Load = Negative pulse >215µs

Figure 1 shows an example of programming a binary code of

10100 and load it in to the device serial register.

The serial interface is automatically reset to 0 when the device

is disabled, or enters UVLO. Therefore, when the part

is enabled, the output brightness is automatically set to the

minimum level.

1200

µs

FN9239 Rev 4.00

March 22, 2010

Page 4 of 10

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