TSL2569 Datasheet, PDF (27/37 Pages) ams AG – LIGHT-TO-DIGITAL CONVERTER

TSL2568, TSL2569
LIGHT-TO-DIGITAL CONVERTER
TAOS091D − DECEMBER 2008
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 16). 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
TSL2568/
TSL2569
0.1 mF
INT
SCL
SDA
t _{Figure 16. Bus Pull-Up Resistors}
G _{s 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 the
A ^t _{SMBus maximum and minimum Rp values, please review the SMBus Specification at}
http://www.smbus.org/specs. For a complete description of I²C maximum and minimum Rp values, please
s ^{n review the I2C Specification at http://www.semiconductors.philips.com.}
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}
Technicaal ^{con note that while Figure 16 shows INT being pulled up to VDD, the interrupt can optionally be pulled up to VBUS.}
Copyright E 2008, TAOS Inc.
26
r
www.taosinc.com
The LUMENOLOGY r Company
r