TSL2561 datasheet(26/37 Pages) OSRAM

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ams Datasheet

Page 25

[v1-01] 2018-Apr-23

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TSL2561 − Application Information: Hardware

Power Supply Decoupling and Application

Hardware Circuit

The power supply lines must be decoupled with a 0.1μF

capacitor placed as close to the device package as possible

(Figure 25). 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 25:

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 I²C maximum and minimum Rp values,

please review the I²C Specification at http://www.nxp.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 10kΩ

and 100kΩ can be used. Please note that while Figure 25 shows

INT being pulled up to VDD, the interrupt can optionally be

pulled up to VBUS.

Application Information:

Hardware

TSL2560/

TSL2561

VBUS

VDD

0.1

SCL

SDA

RPI

INT

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