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Technical content
Features
‧Close to the human eye's response ‧15 bit effective resolution ‧50Hz/60Hz rejection ‧Low sensitivity variation across various light sources ‧Operating temperature performance, -40oC to 85oC ‧Wide supply voltage range, 2.7V to 5.5V ‧ Low power consumption, less than 2mW while operating ‧ Shut-down mode, current consumption less than 0.1uA ‧ I2C serial port communication: (1) Standard 100kHz, (2) Fast 400kHz ‧High dynamic sensing range from 0 to 88,000 Lux ‧Dimension: 2.0mm(L)x2.0mm(W)x0.6mm(H) ‧RoHS compliant and Pb Free
Description
The ALS-PDIC17-57B/TR8 is a digital-output light sensor with a two-wire, I 2C serial interface that is compatible with SMBus operating at 100 KHz serial clock frequency. It combines a photodiode and an analog-to-digital converter (ADC) on a single CMOS integrated circuit to provide light measurements over an effective 15-bit dynamic range. Provided with constantly refreshing ADC. The integrating conversion technique used by ALS-PDIC17-57B/TR8 effectively eliminates the effect of flicker from AC-powered lamps, increasing the stability of the measurement. ALS-PDIC17-57B/TR8 is very close to human-eye vision, having very low response to non-visible light, such as infrared and ultra-violet light.
Applications
‧Detection of ambient light to control display backlighting Mobile devices – Mobile phones, PDAs, Table PC and GPS Computing device – TFT LCD monitor Consumer device – TFT LCD TV, Plasma TV, Video camera, Digital camera, Toys ‧Detection of ambient light for controlling the backlighting of TFT LCD display ‧Automatic residential and commercial lighting management ‧Automatic contrast enhancement for electronic signboard ‧Ambient light monitoring device for daylight and artificial light
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Package Dimensions Unit: mm Tolerance: ±0.2mm
Figure 1. ALS-PDIC17-57B/TR8 Functional Block Diagram
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Electrical and Optical Characteristics (Ta=25Ċ, VDD=3.3V) Parameter Symbol Min. Typ. Max. Unit Condition Supply Current IDD ----- 0.4 0.53 mA VDD=3.3V Power-Down Mode Supply Current IDDQ ----- ----- 0.1 μA VDD=3.3V I2C output low voltage VOL ----- ----- 0.4 V Io = 4mA Detection Full Counts ----- ----- 32767 Counts Detection Limit ----- 44200 ----- Lux TINT=100mS Peak Sensitivity Wavelength λP ----- 580 ----- nm Response in Dark Environment Rdark ----- ---- 1 Count VDD=3.3V EV=0Lux TINT=100ms Response in Fluorescent Light [Note1] Rfrst 44 73 102 Counts VDD=3.3V EV=100Lux TINT=100mS Response in Fluorescent Light [Note2] Ricd 65 108 151 Counts VDD=3.3V EV=100Lux TINT=100mS Note: 1. Fluorescent light (Color Temperature = 6500K) is used as light source. However, White LED is substituted in mass production. 2. Illuminance by CIE standard illuminant-A 2856K of incandescent lamp.
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 DC Characteristics of I2C Signals in Standard and Fast Mode Standard Mode Fast Mode Parameter Symbol Min. Max. Min. Max Unit Power Supply Voltage (Recommend) VDD 2.7 5.5 2.7 5.5 V Low Level Input Voltage VIL -0.5 1.0 -0.5 1.0 V High Level Input Voltage VIH ----- VDD*0.6 [Note3] ----- VDD*0.6 [Note3] V Hysteresis of Schmitt trigger inputs (VDD > 2V) Vhys 0.05*VDD ----- 0.05*VDD ----- V Low level output voltage (open drain) at 3mA sink current (VDD > 2V) VOL1 0 0.4 0 0.4 V Output fall time from VIHMIN to VILMAX with a bus capacitance from 10pF to 400pF Tof ----- 250 [Note2] 20+0.1Cb [Note1] 250 [Note2] nS Input current of each IO pins with an input voltage between 0.1VDD and 0.9VDD II/P -10 10 -10 10 μA Capacitance for each IO pin CI ----- 10 ----- 10 pF Notes: 1. Cb = capacitance of one bus line in pF 2. The maximum t of for the I 2C data and clock bus lines quoted in the AC table is longer than the specified maximum tof for the output stages (250nS). This allows series protection resistors (RS) to be connected between I2C data / clock pins and the I2C data / clock bus lines without exceeding the maximum specified tof. 3. The I2C bus operation voltage is 1.8V, The ALS-PDIC17-57B supply voltage mustÙ3V (3Vx0.6=1.8V)
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 AC Characteristics of I2C Signals in Standard and Fast Mode Standard Mode Fast Mode Parameter Symbol Min. Max. Min. Max Unit I2C clock frequency fSCL 0 100 0 400 KHz Hold time (repeated) START condition. After this period, the first clock pulse is generated. tHD;STA 4.0 0.6 - us Low period of I2C clock tLOW 4.7 1.3 us High period of I2C clock tHIGH 4.0 0.6 us Set-up time for a repeated START condition tSU;STA 4.7 0.6 us Data hold time for I2C-bus devices tHD;DAT 0 3.45 0 0.9 us Data set-up time tSU;DAT 250 - 100 - ns Rise time of both I2C data and clock signal’ s tr - 1000 5 300 ns Fall time of both I2C data and clock signal’ s tf - 300 0.1 300 ns Set-up time for STOP condition tSU;STO 4.0 - 0.6 - us Bus free time between STOP and START condition tBUF 4.7 - 1.3 - us Capacitive load for each bus line Cb - 400 - 400 pF Figure 2 I2C Timing Diagram
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Typical Electro-Optical Characteristics Curves Fig 3 Light Output vs. Illuminance Fig 4 Current Consumption vs. Illuminance Fig 5 Current Consumption vs. Supply Voltage Fig 6 Dark Output vs. Supply Voltage Fig 7 Light Output vs. Supply Voltage Fig 8 Current Consumption vs. Temperature
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Fig 9 Dark Output vs. Temperature Fig 10 Light Output vs. Temperature Fig 11 Spectrum Fig 12 Relative Sensitivity vs. Angle
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Communication Protocol ALS-PDIC17-57B contains an 8-bit command register that can be written and read via the I 2C bus. The command register controls the overall operation of the device. There is a two-byte word read-only register that contains the latest converted value of A/D converter. The I2C slave address is hardwired internally as 0101001 (0x29, MSB to LSB, A6 to A0). All the Send Byte protocol, the Receive Byte protocol and Receive Word protocol are implemented in ALS-PDIC17-57B. The Send Byte protocol allows single bytes of data to be written to the device (see Figure 13-a). The written byte is called the COMMAND byte. The Receive Byte protocol allows one-byte data to be read from the device (see Figure 13-b). Two-byte data can be read by following the Receive Word Protocol shown in Figure 13-c. In Figure 13, the clear area represents data sent by the host (master) and the shaded area represents data returned by the ambient light sensor (slave device). 1 7 1 1 8 1 1 S Slave Address WR A Command Byte A P 0 0 0 (a) Send byte protocol 1 7 1 1 8 1 1 S Slave Address RD A Data NA P 1 0 1 (b) Receive byte protocol 1 7 1 1 8 1 8 1 1 S Slave Address RD A LS byte of ADC A MS byte of ADC NA P 1 0 0 1 (c) Receive word (two bytes) protocol S = start condition P = stop condition Shaded = slave transmission A = acknowledge NA = not acknowledge WR = write RD= read Figure 13 Communication Protocol
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Ambient light intensity count value can be obtained by reading registers of this device. Ambient light intensity count is a 15-bit wide number plus a valid bit and hence word (two bytes) read operation is needed, as shown in Figure 16. After receiving the two byte data, the I2C master terminates this transaction by issuing a NACK command to indicate that the master only wanted to read two bytes from the device. The master generates a stop condition to end this transaction. Figure 16 I2C Timing Diagram for Receive Word Format
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Theory of Operation The photocurrent, generated by the built-in photodiode while being illuminated, is proportionally converted to frequency; the digital frequency signal is then integrated by a 15-bit counter for a predetermined period of time ( Tint). This period of time is called integration time which can be adjusted by changing the nominal value of the resistor between the RINT and GND terminals. The converted data are read out through a two-wire, I2C Interface bus. Since the photodiode has been specially processed to suppress the spectral response in infrared region, the readout is very close to the photopic transfer function, v(λ), which is the mathematic expression of human-eye's response to ambient light. Address Option for I2C The device address is 0x29. ADC Register The ADC register contains 16 bits with a 15-bit wide data from D0 to D14 and a valid bit D15. The register is 2 for details. Table 1 ADC Register Structure Valid Bit Data Bits D15 D14 D13 ~ D8 D7~D1 D0 MSB LSB Most Significant (MS) byte Least Significant (LS) byte
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Device Command There are three command codes are provided for I2C master to control the ambient light sensor. The specific function corresponding to each command code is elaborate in Table 2. Table 2 Command Code List Command Code Function 1xxx_xxxx (binary code) Shut-down mode, this is the default state after applying V DD power to the device. During shut-down mode, users can do the communication test. Except the MSB must be logic 1, the value written to the command register will not change any function and can be read back via the I2C bus by issuing Receive Byte Protocol. 0x04 Activate the ambient light sensor. The integration time is controlled by I 2C commands, start and stop integration. 0x08 Start integration: This command will reset the ADC register to 0x0000 and begin a new integration. 0x30 Stop integration: This command will stop the integration and set the valid bit (D[15]) high.
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Programming Sequence External integration timing (1). After being powered on, the device will initially be in the shut-down mode (default setting). (2). To operate the device, issue an Send Byte protocol (see Figure 13-a) with the device address 0x29 followed by a command byte of 0x04 to activate the ambient light sensor. (3). I2C master sends a "start integration command" to the slave device by issuing Send Byte protocol with the device address 0x29 followed by a command byte of 0x08. (4). After a period of user defined integration time, I2C master sends a "stop integration command" to the slave device by issuing Send Byte protocol with the device address 0x29 followed by a command byte of 0x30. (5). To read the ADC conversion result, issue an Receive Word protocol (see Figure 13-c) with the device address 0x29 followed by two-byte reading procedures. (6). If the stop integration command is not received by the device, the valid bit (D[15]) will be “ 0” to indicate that the data is not valid. If there is a valid conversion result available, the valid bit (D[15]) will be set logic high, and the remaining 15 bits will represent valid data from the ADC register. (7). Data may be read repeatedly from the ADC register, and although it will remain valid, the ADC register will not be updated until a new complete integration cycle has been carried out. In this cases, the power consumption of the device can be reduced by issue a send Byte protocol with the device address 0x29 followed by a data byte of 1xxx_xxxx.(Binary code)
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Noise Rejection and Integration Time In general, integrating type ADC’ s have an excellent 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 periodic noise signal greatly improves the light sensor output signal in the presence of noise. The integration time, Tint, of the ALS-PDIC17-79NB is set by an external resistor Rext. The maximum detection range is inversely proportional to the integration time; that means the longer integration time the lower detection range. Table 3 Detection Range Guide In order to achieve both 120Hz and 100Hz AC rejection, the integration time needs to be adjusted to coincide with an integer multiple of the AC noise cycle times. To determine a suitable integration time, tint, that will ignore the presence of both 120Hz and 100Hz noise, users can use the formula: tint = n(1/120Hz) = m(1/100Hz), where n and m are integers. n/m = 120Hz/100Hz = 6/5. The first instance of integer values at which tint rejects both 120Hz and 10Hz is when m = 5, and n = 6, thus, tint = 6(1/120Hz) = 5(1/100Hz) = 50ms Integration time ( mS ) Detection range ( Lux ) Resolution ( Lux / Count ) 50 88,400 2.7 100 44,200 1.35 200 22,200 0.68 300 14,500 0.45 400 11,100 0.34
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 The power supply lines must be decoupled with capacitors, 4.7uF and 0.1uF, placed as close to the device package as possible. The bypass capacitor should have low effective series resistance (ESR) and effective series inductance (ESI), such as the common ceramic types, which provide a low impedance path to ground at high frequencies to handle transient currents caused by internal logic switching. ALS-PDIC17-57B is relatively insensitive to layout. Like other I 2C devices, it is intended to provide excellent performance even in significantly noisy environments. There are only a few considerations that will ensure best performance. Route the supply and I2C traces as far as possible from all sources of noise. The pull up resister of two line serial bus “ SCL” and “ SDA” are recommended to be around 4.7Kohm, Figure 17 Application Circuit Power Supply Decoupling and Layout 2.7V ~ 5.5V
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Recommended method of storage 1. Do not open moisture proof bag before devices are ready to use. 2. Shelf life in sealed bag from the bag seal date: 18 months at 10°C~30°C and < 90% RH. 3. After opening the package, the devices must be stored at 10°C~30°C and 60%RH, and used within 168 hours (floor life). 4. If the moisture absorbent material ( desiccant material) has faded or unopened bag has exceeded the shelf life or devices (out of bag) have exceeded the floor life, baking treatment is required. 5. If baking is required, refer to IPC/JEDEC J-STD-033 for bake procedure or recommend the following conditions: 312 hours at 40°C and < 5 % RH (reeled/tubed/loose units) or 33 hours at 90°C and < 5 % RH (reeled/tubed/loose units) or 9 hours at 125°C, not suitable for reel or tubes. Recommended Solder Profile Notice: (1) Reflow soldering should not be done more than two times. (2) When soldering, do not put stress on the devices during heating. (3) After soldering, do not warp the circuit board.
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Soldering Iron Each terminal is to go to the tip of soldering iron temperature less than 350Ċ for 3 seconds within once in less than the soldering iron capacity 25W. Leave two seconds and more intervals, and do soldering of each terminal. Be careful because the damage of the product is often started at the time of the hand solder. Repairing Repair should not be done after the device have been soldered. When repairing is unavoidable, a double-head soldering iron should be used (as below figure). It should be confirmed beforehand whether the characteristics of the device will or will not be damaged by repairing.
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Packing Quantity Specification
2000 PCS/ 1 Reel
CPN: Customer’ s Production Number P/N: Production Number QTY: Packing Quantity CAT: Ranks HUE: Peak Wavelength REF: Reference LOT No: Lot Number MADE IN TAIWAN: Production Place
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Reel Dimensions Tape Dimensions W E F D0 D1 P0 P1 P2 t A0 B0 K0 Unit: mm Tolerance: ± 0.2 Unit: mm
LifecyclePhase: Revision : 2 Expired Period: Forever Release Date:2013-06-04 08:06:07.0 DATASHEET SMD I2C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Note: 1. Above specification may be changed without notice. EVERLIGHT will reserve authority on material change for above specification. 2. When using this product, please observe the absolute maximum ratings and the instructions for using outlined in these specification sheets. EVERLIGHT assumes no responsibility for any damage resulting from use of the product which does not comply with the absolute maximum ratings and the instructions included in these specification sheets. 3. These specification sheets include materials protected under copyright of EVERLIGHT corporation. Please don’ t reproduce or cause anyone to reproduce them without EVERLIGHT’ s consent.