TSL2563CS datasheet(28/38 Pages) TAOS

28 / 38 page

TSL2562, TSL2563

LOW-VOLTAGE

LIGHT-TO-DIGITAL CONVERTER

TAOS066J − MAY 2007

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 16). 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.

TSL2562/

TSL2563

VBUS

VDD

0.1 mF

SCL

SDA

RPI

INT

Figure 16. Bus Pull-Up Resistors

Pull-up resistors (Rp) maintain the SDAH and SCLH 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. For a complete description of the

SMBus maximum and minimum Rp values, please review the SMBus Specification at

http://www.smbus.org/specs. For a complete description of I2C maximum and minimum Rp values, please

review the I2C Specification at http://www.semiconductors.philips.com.

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 KΩ and 100 KΩ can be used. Please

note that while the figure above shows INT being pulled up to VDD, the interrupt can optionally be pulled up to

VBUS.

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