TSL26711FN datasheet(32/45 Pages) OSRAM

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ams Datasheet

Page 31

[v1-00] 2016-Jul-12

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TSL2671 − Application Information: Hardware

LED Driver Pin with Proximity Detection

The application hardware circuit with proximity detection

requires an LED connected as shown in Figure 37. Vbat may be

an independent power source. The 1-

μF decoupling capacitors

should be of the low-ESR type and be placed as close as possible

to the load and VDD to reduce noise. To maximize system

performance, the use of PCB power and ground planes are

recommended. If mounted on a flexible circuit, the power and

ground traces back to the PCB should be sufficiently wide

enough to have a low resistance, such as < 1

Ω.

The I²C bus protocol was developed by Philips (now NXP). The

pull-up resistor value (RP) is a function of the I²C bus speed, the

supply voltage, and the capacitive bus loading. 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 VDD = 3 V, 1.5-kΩ.

resistors have been found to be viable.

Figure 37:

Application Hardware Circuit for Proximity Sensing with Internal LED Driver

The power supply connection — PCB routing and supply

decoupling — has a significant effect on proximity

performance. Contact ams or see the application notes

available at www.ams.com for power supply guidance.

Application Information:

Hardware

TSL2671

VBUS

VDD(digital)

SCL

SDA

RPI

INT

LDR

LED

VDD(analog)

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