TSL2583 datasheet(25/33 Pages) AMSCO

25 / 33 page

TSL2581, TSL2583

LIGHT-TO-DIGITAL CONVERTER

TAOS134A − JULY 2012

E 2012, TAOS Inc.

The LUMENOLOGY

r Company

www.taosinc.com

APPLICATION INFORMATION: HARDWARE

Power Supply Decoupling and Application Hardware Circuit

The power supply lines must be decoupled with a 0.1

μF capacitor placed as close to the device package as

possible (Figure 7). The bypass capacitor should have low effective series resistance (ESR) and low effective

series inductance (ESI), such as the common ceramic types, which provide a low impedance path to ground

at high frequencies to handle transient currents caused by internal logic switching.

Figure 3 shows how the 111

× gain is impacted by the line inductance between the VDD pin and the decoupling

capacitor.

TSL2581/

TSL2583

VBUS

VDD

0.1

SCL

SDA

RPI

INT

Figure 7. Bus Pull-Up Resistors

Pull-up resistors (RP) maintain the SCL and SDA lines at a high level when the bus is free and ensure the signals

are pulled up from a low to a high level within the required rise time. The I2C bus protocol was developed by

Philips (now NXP). The pull-up resistor (RP) value is a function of the I2C bus speed, the supply voltage, and

the

capacitive

bus

Users

should

consult

the

NXP

I2C

design

specification

(http://www.i2c−bus.org/references/) for assistance. With a lightly loaded bus running at 400 kbps and

VBUS = 3 V, 1.5 kΩ resistors have been found to be viable.

A pull-up resistor (RPI) is also required for the interrupt (INT), which functions as a wired-AND signal in a similar

fashion to the SCL and SDA lines. A typical impedance value between 10 k

Ω and 100 kΩ can be used.

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