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ISL29011 Datasheet(PDF) 9 Page - Intersil Corporation

No. de pieza ISL29011
Descripción Electrónicos  Digital Ambient Light Sensor and Proximity Sensor with Interrupt Function
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Fabricante Electrónico  INTERSIL [Intersil Corporation]
Página de inicio  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL29011 Datasheet(HTML) 9 Page - Intersil Corporation

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9
FN6467.2
May 14, 2009
The transfer function used for n-bit ADC becomes
Equation 3:
Here, n = 4, 8, 12 or 16. This is the number of ADC bits
programmed in the command register. 2n represents the
maximum number of counts possible from the ADC output.
Data is the ADC output stored in the data registers (02 hex
and 03 hex).
Integration and Conversion Time
The ADC resolution and fOSC determines the integration
time, tint as shown in Equation 4.
where n is the number of bits of resolution and n = 4, 8, 12 or
16. 2n, therefore, is the number of clock cycles. n can be
programmed at the command register 01(hex) bits 3 and 2.
External Scaling Resistor REXT for fOSC and
Range
The ISL29011 uses an external resistor REXT to fix its
internal oscillator frequency, fOSC and the light sensing
range, Range. fOSC and Range are inversely proportional to
REXT. For user simplicity, the proportionality constant is
referenced to 499k
Ω as shown in Equations 5 and 6:
Noise Rejection
In general, integrating type ADC’s have excellent
noise-rejection characteristics for periodic noise sources
whose frequency is an integer multiple of the conversion
rate. For instance, a 60Hz AC unwanted signal’s sum from
0ms to k*16.66ms (k = 1,2...ki) is zero. Similarly, setting the
device’s integration time to be an integer multiple of the
periodic noise signal, greatly improves the light sensor
output signal in the presence of noise.
ADC Output in IR Sensing
The ISL29011’s ADC output codes, DATA, are directly
proportional to the IR intensity received in the IR sensing.
Here, EIR is the received IR intensity. The constant β
changes with the spectrum of background IR noise like
sunlight and incandescent light. The
β also changes with the
ADC’s range and resolution selections.
ADC Output in Proximity Sensing
In the proximity sensing, the ADC output codes, DATA, are
directly proportional to the total IR intensity from the
background IR noise and from the IR LED driven by the
ISL29011.
Here,
β and EIR have the same meanings as in Equation 7.
The constant
γ depends on the spectrum of the used IR LED
and the ADC’s range and resolution selections. ELED is the
IR intensity which is emitted from the IR LED and reflected
by a specific objector to the ISL29011. ELED depends on the
current to the IR LED and the surface of the object. ELED
decreases with the square of the distance between the
object and the sensor.
If background IR noise is small, EIR can be neglected, and
the ADC output directly decreases with the distance. If there
is significant background IR noise, ISL29011 offers two
schemes to reduce the effect. The first way is do a proximity
sensing using Scheme 0, immediately followed by an IR
sensing. The differential reading of ADC outputs from the
proximity and IR sensing will then reduce the effect of
background IR noise and directly decrease with the distance
between the object and the sensor. The second way is to do
a proximity sensing using Scheme 1 to do on-chip
background IR noise subtraction. While Scheme 0 has wider
dynamic range, Scheme 1 proximity detection is faster but
with half the resolution. Please refer to “Typical Performance
Curves” on page 12 for ADC output versus distance using
Scheme 0 detection.
Figure 9 shows ISL29011 configured at 12-bit ADC
resolution and sensitivity range select at 16000 (range 3) for
the proximity reading. A 12.5mA external LED current at
360kHz modulation frequency detects three different sensing
objects: 92% brightness paper, 18% gray card and ESD
black foam. Figure 10 shows ISL29011 configured at 12-bit
ADC resolution and sensitivity range select at 1000
(range 1) for the proximity reading, with a programmed
external LED at 360kHz modulation frequency, detecting the
same sensing object: 18% gray card under four different
external LED current: 12.5mA, 25mA, 50mA and 100mA to
compare the proximity readout versus distance.
ISL29011 Proximity sensing relies on the amount of IR
reflected back from the objects to be detected. Clearly, it can
not detect an optically black object that reflects no light.
However, ISL29011 is sensitive enough to detect a black ESD
foam, which reflects slightly less than 1% of IR, as shown in
Figure 9 on page 12. For biological objects, blonde hair
reflects more than brunette hair, as expected and shown in
TABLE 11. INTEGRATION TIME OF n-BIT ADC
REXT
(k
Ω)
n = 16-BIT
(ms)
n = 12-BIT
(ms)
n = 8-BIT
(µs)
n = 4-BIT
(µs)
250
45
2.812
175.5
10.8µs
499**
90
5.63
351
21.6µs
**Recommended REXT resistor value
(EQ. 3)
Ecal
Range k
()
2
n
---------------------------
DATA
×
=
tint
2
n
1
fOSC
--------------
×
2
n
REXT
725kHz 499k
Ω
×
----------------------------------------------
×
==
(EQ. 4)
(EQ. 5)
Range
499k
Ω
REXT
------------------
Range k
()
×
=
(EQ. 6)
fOSC
499k
Ω
REXT
------------------
725
×
kHz
=
DATAIR
β E
IR
×
=
(EQ. 7)
DATAPROX
β E
IR
×γ E
LED
×
+
=
(EQ. 8)
ISL29011


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