TCS3404_11 Datasheet, PDF (33/41 Pages) ams AG – DIGITAL COLOR SENSORS

TCS3404, TCS3414
DIGITAL COLOR SENSORS
TAOS137A − APRIL 2011
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 28). 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.
V_BUS
V_DD
ill ^{valid RP}
R_P
R_PI
TCS3404/14
0.1 mF
INT
SCL
SDA
G _{st Figure 28. Bus Pull-Up Resistors}
A ^t Pull-up resistors (Rp) maintain the SDA and SCL 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
s ^{n and minimum Rp values, please review the NXP I2C design specification at http://www.i2c−bus.org/references/.}
e ^{A pull-up resistor (R}PI^{) is also required for the interrupt (INT), which functions as a wired-AND signal in a similar}
m ^{t 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 V_DD, the interrupt can optionally be pulled up to
Technicaal ^{con VBUS.}
Copyright E 2011, TAOS Inc.
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