ISL97632IRT14ZT 查看數據表（PDF） - Intersil

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ISL97632IRT14ZT

LED Driver with 1-Wire Dimming

Intersil 

Single-Wire Serial Interface

30µs

ISL97632

100µs

'1'

'0'

'1'

'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

4

FN9239.3

March 22, 2010

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