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ISL29030AIROZ-T7 データシート(PDF) 10 Page - Intersil Corporation

部品番号 ISL29030AIROZ-T7
部品情報  Low Power Ambient Light and Proximity Sensor with Intelligent Interrupt
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メーカー  INTERSIL [Intersil Corporation]
ホームページ  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL29030AIROZ-T7 データシート(HTML) 10 Page - Intersil Corporation

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ISL29030A
10
FN7722.0
November 18, 2010
Interrupt Function
The ISL29030A has an intelligent interrupt scheme
designed to shift some logic processing away from
intensive microcontroller I2C polling routines (which
consume power) and towards a more independent light
sensor which can instruct a system to “wake up” or “go
to sleep.”
An ALS interrupt event (ALS_FLAG) is governed by
Registers 5 through 7. The user writes a high and low
threshold value to these registers and the ISL29030A will
issue an ALS interrupt flag if the actual count stored in
Registers 0x9 and 0xA are outside the user’s programmed
window. The user must write 0 to clear the ALS_FLAG.
A proximity interrupt event (PROX_FLAG) is governed by
the high and low thresholds in registers 3 and 4
(PROX_LT and PROX_HT). PROX_FLAG is set when the
measured proximity data is more than the higher
threshold X-times-in-a-row (X is set by user; see
following paragraph). The proximity interrupt flag is
cleared when the prox data is lower than the low
proximity threshold X-times-in-a-row, or when the user
writes “0” to PROX_FLAG.
Interrupt persistency is another useful option available
for both ALS and proximity measurements. Persistency
requires X-in-a-row interrupt flags before the INT pin is
driven low. Both ALS and Prox have their own
independent interrupt persistency options. See
ALS_PRST and PROX_PRST bits in Register 2.
The final interrupt option is the ability to AND or OR the
two interrupt flags using Register 2 Bit 0 (INT_CTRL). If
the user wants both ALS/Prox interrupts to happen at the
same time before changing the state of the interrupt pin,
set this bit high. If the user wants the interrupt pin to
change state when either the ALS or the Proximity
interrupt flag goes high, leave this bit to its default of 0.
Analog-Out IALS Pin
When ALS_EN = 1, The analog IALS output pin sources a
current directly proportional to the digital count stored in
register bits ALSIRDATA[11:0]. When ALS_EN = 0, this
pin is in a high impedance state. See Figure 15 for the
effects of the compliance voltage VI_ALS on IALS.
ALS Range 1 Considerations
When measuring ALS counts higher than 1800 on range
1 (ALSIR_MODE = 0, ALS_RANGE = 0, ALS_DATA >
1800), switch to range 2 (change the ALS_RANGE bit
from “0” to “1”) and remeasure ALS counts. This
recommendation pertains only to applications where the
light incident upon the sensor is IR-heavy and is distorted
by tinted glass that increases the ratio of infrared to
visible light. For more information, see the separate ALS
Range 1 Considerations document.
VDD Power-up and Power Supply
Considerations
Upon power-up, please ensure a VDD slew rate of
0.5V/ms or greater. After power-up, or if the user’s
power supply temporarily deviates from our specification
(2.25V to 3.63V), Intersil recommends the user write the
following: write 0x00 to register 0x01, write 0x29 to
register 0x0F, write 0x00 to register 0x0E, and write
0x00 to register 0x0F. The user should then wait ~1ms
or more and then rewrite all registers to the desired
values. If the user prefers a hardware reset method
instead of writing to test registers: set VDD =0V for 1
second or more, power back up at the required slew rate,
and write registers to the desired values.
Power-Down
The power-down can be set 2 ways by the user. The first is
to set both PROX_EN and ALS_EN bits to 0 in Register 1.
The second and more simple way is to set all bits in
Register 1 to 0 (0x00).
Calculating Lux
The ISL29030A’s ADC output codes are directly
proportional to lux when in ALS mode (see ALSIR_MODE
bit).
In Equation 2, Ecalc is the calculated lux reading and OUT
represents the ADC code. The constant α to plug in is
determined by the range bit ALS_RANGE (register 0x1
bit 1) and is independent of the light source type.
Table 15 shows two different scale factors: one for the
low range (ALS_RANGE = 0) and the other for the high
range (ALS_RANGE = 1).
Noise Rejection
Charge balancing 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. Since wall sockets
may output at 60Hz or 50Hz, our integration time is
100ms: the lowest common integer number of cycles for
both frequencies.
Proximity Detection of Various Objects
Proximity sensing relies on the amount of IR reflected
back from objects. A perfectly black object would
absorb all light and reflect no photons. The ISL29030A
is sensitive enough to detect black ESD foam which
reflects only 1% of IR. For biological objects, blonde
hair reflects more than brown hair and customers may
notice that skin tissue is much more reflective than hair.
IR penetrates into the skin and is reflected or scattered
TABLE 15. ALS SENSITIVITY AT DIFFERENT RANGES
ALS_RANGE
αRANGE
(Lux/Count)
0
0.0326
1
0.522
Ecalc
α
RANGE
OUTADC
×
=
(EQ. 2)


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