收藏本站
ISL29028
ALS
ACTIVE
ALS CONVERSION TIME =
100ms (FIXED)
SEVERAL μs BETWEEN
CONVERSIONS
100ms
100ms
100ms
100ms
100ms
TIME
0.54ms FOR PROX
PROX
CONVERSION
SENSOR
ACTIVE
TIME
SERIES OF
IRDR
(CURRENT
CURRENT PULSES
TOTALING 0.1ms
DRIVER)
TIME
SLEEP TIME
(PROX_SLP)
FIGURE 3. TIMING DIAGRAM FOR PROX/ALS EVENTS - NOT TO SCALE
The proximity sensor is an 8-bit ADC which operates in a
similar fashion. When proximity sensing is enabled, the
IRDR pin will drive a user-supplied infrared LED, the
emitted IR reflects off an object (i.e., a human head) back
into the ISL29028, and a sensor converts the reflected IR
wave to a current signal in 0.54ms. The ADC subtracts
the IR reading before and after the LED is driven (to
remove ambient IR such as sunlight), and converts this
current depends on Register 1 bit 3: PROX_DR. If this bit
is low, the load will see a fixed 110mA current pulse. If
this bit is high, the load on IRDR will see a fixed 220mA
current pulse as seen in Figure 4.
220mA
(PROX_DR = 1)
value to a digital count stored in Register 0x8.
The ISL29028 is designed to run two conversions
concurrently: a proximity conversion and an ALS (or IR)
conversion. Please note that because of the conversion
110mA
(PROX_DR = 0)
PIN 8 - IRDR
I lRDR ; AVE = --------------------------------------------------------
times, the user must let the ADCs perform one full
conversion first before reading from I 2 C Registers
PROX_DATA (wait 0.54ms) or ALSIR_DT1/2 (wait 100ms).
The timing between ALS and Prox conversions is arbitrary
(as shown in Figure 3). The ALS runs continuously with
new data available every 100ms. The proximity sensor
runs continuously with a time between conversions
decided by PROX_SLP (Register 1 Bits [6:4]).
Ambient Light and IR Sensing
The ISL29028 is set for ambient light sensing when
Register bit ALSIR_MODE = 0 and ALR_EN = 1. The
light-wavelength response of the ALS appears as shown
in Figure 6. ALS measuring mode (as opposed to IR
measuring mode) is set by default.
When the part is programmed for infrared (IR) sensing
(ALSIR_MODE = 1; ALS_EN = 1), infrared light is
converted into a current and digitized by the same ALS
ADC. The result of an IR conversion is strongly related to
the amount of IR energy incident on our sensor, but is
unitless and is referred to in digital counts.
Proximity Sensing
When proximity sensing is enabled (PROX_EN = 1), the
external IR LED is driven for 0.1ms by the built-in IR LED
driver through the IRDR pin. The amplitude of the IR LED
9
(IRDR IS HI-Z WHEN
NOT DRIVING)
FIGURE 4. CURRENT DRIVE MODE OPTIONS
When the IR from the LED reaches an object and gets
reflected back into the ISL29028, the reflected IR light is
converted into current as per the IR spectral response
shown in Figure 7. One entire proximity measurement
takes 0.54ms for one conversion (which includes 0.1ms
spent driving the LED), and the period between proximity
measurements is decided by PROX_SLP (sleep time) in
Register 1 Bits 6:4.
Average LED driving current consumption is given by
Equation 1.
I lRDR ; PEAK × 100 μ s (EQ. 1)
T SLEEP
A typical IRDR scheme is 220mA amplitude pulses every
800ms, which yields 28 μ A DC.
Total Current Consumption
Total current consumption is the sum of I DD and I IRDR .
The IRDR pin sinks current (as shown in Figure 4) and
the average IRDR current can be calculated using
Equation 1 above. I DD depends on voltage and the
mode-of-operation as seen in Figure 11.
FN6780.2
November 4, 2011
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
ISL29030AIROZ-EVALZ BOARD EVAL FOR ISL29030A
ISL29101IROZ-EVALZ EVALUATION BOARD FOR ISL29101
ISL29102IROZ-EVALZ EVALUATION BOARD FOR ISL29102
ISL5961EVAL2 ISL5961 TSSOPEVALUATION PLATF
ISL76683EVAL1Z BOARD EVALUATION FOR ISL76683
ISL97632IRTZ-EVALZ EVAL BOARD FOR ISL97632IRTZ
ISL97671IRZ-EVALZ BOARD EVALUATION FOR ISL97671
ISL97684IRTZEVALZ EVAL BOARD LED DRIVER
相关代理商/技术参数
ISL29028IROZ-T7 功能描述:IC SENSOR LIGHT-PROXIMITY 8ODFN RoHS:是 类别:传感器，转换器 >> 多功能 系列:* 其它有关文件:Automotive Product Guide 标准包装:2,500 系列:- 传感器类型:光线和近程 输出类型:I²C?
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:-
ISL29030AIROZ-T7 功能描述:IC PROXIMITY SENSOR AMB LT 8ODFN RoHS:是 类别:传感器，转换器 >> 多功能 系列:* 其它有关文件:Automotive Product Guide 标准包装:2,500 系列:- 传感器类型:光线和近程 输出类型:I²C?
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
ISL29030IROZ-T7 制造商:Intersil Corporation 功能描述:ISL29030IROZ PBFREE AUTONOMOUS LOW POWER ALS + PROXIMITY SEN - Tape and Reel 制造商:Intersil Corporation 功能描述:ISL29030IROZ PbFree Autonomous Low Power ALS + Proximity sen T/R
ISL29033IROZ-T7 功能描述:IC PHOTO DETECTOR AMBIENT 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)