TCS3471 datasheet(18/23 Pages) AMSCO

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TCS3471

COLOR LIGHT-TO-DIGITAL CONVERTER

TAOS115 − MARCH 2011

The LUMENOLOGY

r Company

E 2011, TAOS Inc.

www.taosinc.com

APPLICATION INFORMATION: HARDWARE

Typical Hardware Application

A typical hardware application circuit is shown in Figure 11. A 1-

μF low-ESR decoupling capacitor should be

placed as close as possible to the VDD pin.

TCS3471

INT

SDA

SCL

VDD

GND

VBUS

RPI

VDD

Figure 11. Typical Application Hardware Circuit

VBUS in Figure 11 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 Available Options table 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 TAOS EVM running

at 400 kbps, uses 1.5-k

Ω resistors. A 10-kΩ pull-up resistor (RPI) can be used for the interrupt line.

PCB Pad Layout

Suggested PCB pad layout guidelines for the Dual Flat No-Lead (FN) surface mount package are shown in

Figure 12.

400

2500

400

1000

1700

650

1000

650

Note: Pads can be

extended further if hand

soldering is needed.

NOTES: A. All linear dimensions are in micrometers.

B. This drawing is subject to change without notice.

Figure 12. Suggested FN Package PCB Layout

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