TSL2771 datasheet(40/51 Pages) OSRAM

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ams Datasheet

Page 39

[v1-00] 2016-Mar-22

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TSL2771 − Application Information Hardware

If it is not possible to provide two separate power supplies, the

device can be operated from a single supply. A 22-

Ω resistor in

series with the VDD supply line and a 1-μF low ESR capacitor

effectively filter any power supply noise. The previous capacitor

placement considerations apply.

Figure 44:

Proximity Sensing Using Single Power Supply

VBUS in the above figures refers to the I²C bus voltage which is

either VDD or 1.8 V. Be sure to apply the specified I²C bus voltage

shown in the Ordering Information for the specific device being

used.

The I²C signals and the Interrupt are open-drain outputs and

require pull-up resistors. The pull-up resistor (RP) value is a

function of the I²C bus speed, the I²C bus voltage, and the

capacitive load. The ams EVM running at 400 kbps, uses 1.5-k

resistors. A 10-k

Ω pull-up resistor (RPI) can be used for the

interrupt line.

TSL2771

INT

SDA

SCL

VDD

LDR

Voltage

Regulator

. 22 mF

IR LED

GND

VBUS

RPI

* Cap Value Per Regulator Manufacturer Recommendation

TSL2771 Datenblatt(PDF) 40 Page - OSRAM GmbH