ISL29034_14 Datasheet, PDF (13/15 Pages) Intersil Corporation – Integrated Digital Light Sensor

ISL29034
Temperature Coefficient
The limits stated for temperature coefficient (TC) are governed by
the method of measurement. The “Box” method is usually used
for specifying the temperature coefficient. The overwhelming
standard for specifying the temperature drift of a reference is to
evaluate the maximum voltage change over the specified
temperature range. This yields ppm/°C, and is calculated using
and is calculated using Equation 4:
TC
=
---------------------^V----^H----^I--^G-----^H-----–-----^V----^L---^O-----^W------------------------
V_NOMINAL × (T_HIGH – T_LOW)
×
10⁶
(EQ. 6)
where:
V_HIGH is the maximum reference voltage over the temperature
range.
V_LOW is the minimum reference voltage over the temperature
range.
V_NOMINAL is the nominal reference voltage at +25°C.
T_HIGH - T_LOW is the specified temperature range (°C)
Digital Inputs and Termination
The ISL29034 digital inputs are guaranteed to CMOS levels. The
internal register is updated on the rising edge of the clock.
To minimize reflections, proper termination should be
implemented. If the lines driving the clock and the digital inputs
are 50Ω lines, then 50Ω termination resistors should be placed
as close to the sensor inputs as possible, connected to the digital
ground plane (if separate grounds are used).
Typical Circuit
A typical application for the ISL29034 is shown in Figure 15. The
ISL29034’s I²C address is internally hard-wired as 1000100. The
device can be tied onto a system’s I²C bus together with other I²C
compliant devices.
VDD_PULLUP
4.7k
SDA
MCU
SCL
100
VDD
1µF
4.7k
1
VDD
4 SDA
ISL29034
3 SCL
GND
2
FIGURE 15. ISL29034 TYPICAL CIRCUIT
FIGURE 16. 4 LD ODFN SENSOR LOCATION OUTLINE
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FN8370.1
April 9, 2014