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参数资料
| 型号： | ISL29028IROZ-T7 |
| 厂商： | Intersil |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC SENSOR LIGHT-PROXIMITY 8ODFN |
| 标准包装： | 3,000 |
| 系列： | * |
ISL29028
E calc = α RANGE × OUT ADC
Interrupt Function
The ISL29028 has an intelligent interrupt scheme
designed to shift some logic processing away from
intensive microcontroller I 2 C 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 ISL29028 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 next
to test registers: set V DD = 0V for 1 second or more,
power back up at the required slew rate, and write
registers to the desired values.
Power-Down
To put the ISL29028 into a power-down state, the user
can set both PROX_EN and ALS_EN bits to 0 in Register 1.
Or more simply, set all of Register 1 to 0x00.
Calculating Lux
The ISL29028’s ADC output codes are directly proportional
to lux when in ALS mode (see ALSIR_MODE bit).
(EQ. 2)
In Equation 2, E calc 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. ALS SENSITIVITY AT DIFFERENT RANGES
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
ALS_RANGE
0
1
α RANGE
(Lux/Count)
0.0326
0.522
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.
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.
V DD Power-up and Power Supply
Considerations
Upon power-up, please ensure a V DD 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
10
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...k i ) 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 ISL29028 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
back from within. As a result, the proximity count peaks
at contact and monotonically decreases as skin moves
away. The reflective characteristics of skin are very
different from that of paper.
FN6780.2
November 4, 2011
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| ISL29028IROZ-T7R5484 | 制造商:Intersil Corporation 功能描述:DOMINANT ASSEMBLY ONLY - PBFREE AUTONOMOUS LOW POWER ALS + P - Tape and Reel 制造商:Intersil Corporation 功能描述:IC PROXIMITY SENSOR AMB LT 8ODFN 制造商:Intersil 功能描述:DOMINANT ASSEMBLY ON LYFREE AUTONOMOUS |
| ISL29029IROZ-T7 | 功能描述:IC SENSOR LIGHT-PROXIMITY 8ODFN RoHS:是 类别:传感器，转换器 >> 光学 - 光电探测器 - 环境光传感器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 产品变化通告:Product Discontinuation 25/Jun/2012 标准包装:2,500 系列:- 带接近传感器:无 波长:- 电源电压:1.7 V ~ 2 V 电流 - 暗（标准）:- 电流 - 光（典型值）:- 输出类型:数字 - I²C 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UDFN 裸露焊盘 包装:带卷 (TR) |
| ISL29030AIROZ-EVALZ | 功能描述:BOARD EVAL FOR ISL29030A RoHS:是 类别:编程器，开发系统 >> 评估板 - 传感器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
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| ISL29030IROZ-EVALZ | 制造商:Intersil Corporation 功能描述: 制造商:Intersil Corporation 功能描述:ISL29030IROZ-EVALZ (PB-FREE ) EVALUATION BOARD - ROHS COMPLI - Bulk 制造商:Intersil Corporation 功能描述:ISL29030IROZ-EVALZ (PB-Free ) EVALUATION BOARD - ROHs Compli |
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