- 您现在的位置：买卖IC网 > Datasheet目录985 > ISL29012IROZ-EVALZ (Intersil)EVALUATION BOARD ISL29012IROZ Datasheet资料下载
参数资料
| 型号： | ISL29012IROZ-EVALZ |
| 厂商： | Intersil |
| 文件页数： | 8/15页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD ISL29012IROZ |
| 标准包装： | 1 |
| 传感器类型： | 灯光，数字式输出 |
| 传感范围： | 128000Lux |
| 接口： | I²C，SM 总线 |
| 灵敏度： | 540nm |
| 电源电压： | 2.5 V ~ 3.3 V |
| 嵌入式： | 否 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL29012 |
ISL29003
(EQ. 9)
× ----------
t INT = 2
f osc
f OSC
m R EXT
× ----------------------------------------------
t INT 1 = 2
Integration time in Internal Timing Mode
This timing mode is programmed in the command register
00(hex) Bit 5. Most applications will be using this timing
mode. When using the Internal Timing Mode, f OSC and
n-bits resolution determine the integration time. t INT is a
function of the number of clock cycles and f OSC as shown in
Equation 9:
m 1
for Internal Timing Mode only
m = 4, 8, 12, and16. n is the number of bits of resolution.
2 m therefore is the number of clock cycles. n can be
programmed at the command register 00(hex) Bits 1 and 0.
Since f OSC is dual speed depending on the Gain/Range bit,
t INT is dual time. The integration time as a function of R EXT
is shown in Equation 10:
(EQ. 10)
342kHz × 100k Ω
count DATA, and starts over again to commence conversion
of diode array 1.
The integration time, t INT , is the sum of two identical time
intervals between the three sync pulses. t INT is determined
by Equation 12:
k OSC
t INT = --------------- (EQ. 12)
where K OSC is the number of internal clock cycles obtained
from Timer data register and f OSC is the internal I 2 C
operating frequency
The internal oscillator, f OSC , operates identically in both the
internal and external timing modes, with the same
dependence on R EXT . However, in External Timing Mode,
the number of clock cycles per integration is no longer fixed
at 2 n . The number of clock cycles varies with the chosen
integration time, and is limited to 2 16 = 65,536. In order to
avoid erroneous lux readings, the integration time must be
short enough not to allow an overflow in the counter register.
t INT < ------------------
t INT1 is the integration time when the device is configured
for Internal Timing Mode and Gain/Range is set to Range1
or Range2.
65,535
f OSC
(EQ. 13)
R EXT
684kHz × 100k Ω
t INT 2 = 2
m
× ----------------------------------------------
(EQ. 11)
f OSC = 342kHz*100k Ω /R EXT . When Range/Gain is set to
Range1 or Range2.
t INT2 is the integration time when the device is configured
for Internal Timing Mode and Gain/Range is set to Range3
or Range4.
TABLE 13. INTEGRATION TIMES FOR TYPICAL REXT VALUES
f osc = 684kHz*100k Ω /R EXT . When Range/Gain is set to
Range3 or Range4.
Noise Rejection
In general, integrating type ADC’s have excellent
R EXT
(k Ω)
50
RANGE1
RANGE2
n = 15-BIT n = 11-BIT
100 6.4
RANGE3
RANGE4
n = 11-BIT n=3
3.2 0.013
noise-rejection characteristics for periodic noise sources
whose frequency is an integer multiple of the integration
time. 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
100**
200
500
200
400
1000
13
26
64
6.5
13
32
0.025
0.050
0.125
periodic noise signal, greatly improves the light sensor
output signal in the presence of noise.
Ambient Light Sensing Operation
*Integration time in milliseconds
**Recommended R EXT resistor value
Integration time in External Timing Mode
This timing mode is programmed in the command register
00(hex) Bit 5. External Timing Mode is recommended when
integration time can be synchronized to an external signal
such as a PWM to eliminate noise.
To read the light count DATA output, the device needs three
sync_I 2 C commands to complete one measurement. The 1st
sync_I 2 C command starts the conversion of the diode array 1.
The 2nd sync_I 2 C completes the conversion of diode array 1
and starts the conversion of diode array 2. The 3rd sync_I 2 C
pules ends the conversion of diode array 2, outputs the light
8
The operation of ambient light sensing (ALS) within the
ISL29012 utilizes two diodes; D1 and D2. The D1 diode is
sensitive to both visible and IR light spectrum. The D2 diode
is sensitive to IR spectrum. D1 and D2 spectrum response is
shown in Figure 20. The diodes are measured sequentially
and their outputs are converted with an ADC. The output of
the ALS is the difference between these two measurements.
Maximum Ambient Intensity Condition
In typical applications, the ISL29012 is installed behind a
dark cover window. In this low-light condition, both D1 and
D2 operate linearly and the ALS output is linear as well
(Figures 18 and 19). In brighter environments and with
transparent glass, however, D1 and D2 can be subject to
saturation. As the ambient light grows bright enough to
subject one or both diodes to saturation, the ALS count
(output) decreases and eventually reaches zero in deep
FN6476.2
November 17, 2011
相关PDF资料 |
PDF描述 |
|---|---|
| ISL29013IROZ-EVALZ | EVALUATION BOARD FOR ISL29013 |
| ISL29015IROZ-EVALZ | EVALUATION BOARD FOR ISL29015 |
| ISL29018IROZ-EVALZ | EVALUATION BOARD FOR ISL29018 |
| ISL29020IROZ-EVALZ | EVALUATION BOARD FOR ISL29020 |
| ISL29021IROZ-EVALZ | EVAL BOARD FOR ISL29021IROZ |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL29012IROZ-T7 | 功能描述:IC SENSOR LIGHT-DGTL I2C 6-ODFN 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) |
| ISL29013IROZ | 制造商:Intersil Corporation 功能描述:Light-To-Digital Sens,ISL29013IROZ |
| ISL29013IROZ-EVALZ | 功能描述:EVALUATION BOARD FOR ISL29013 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:- |
| ISL29013IROZ-T7 | 功能描述:光学数位转换器 ISL29013IROZ LIGHT- TO-DIGTL OUTPUT SNSR RoHS:否 制造商:ams 数据总线宽度: 峰值波长:470 nm 最大工作频率: 工作电源电压: 工作电流: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:Chipscale-6 封装:Reel |
| ISL29015IROZ-EVALZ | 功能描述:EVALUATION BOARD FOR ISL29015 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:- |
发布紧急采购，3分钟左右您将得到回复。