Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 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, -40 C to 85 C ‧Wide supply voltage range, 2.7V to 5.5V o o • Low power consumption, less than 2mW while operating • Shut-down mode, current consumption less than 0.1uA 2 • I C serial port communication: (1) Standard 100kHz, (2) Fast 400kHz High dynamic sensing range and 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, I2C 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. One operation modes are provided with constantly refreshing ADC. When working in “one time integration” mode, no external resister is required. 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 Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 1 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Package Dimensions Unit: mm Tolerance: ±0.1mm Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 2 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Absolute Maximum Ratings (Ta=25℃ ℃) Parameter Symbol Min. Max. Units Storage temperature TSTG -40 100 °C Operating temperature TOPR -40 85 °C Supply voltage VDD -0.3 6.0 V Digital output voltage Vo -0.3 6.0 V Digital output current Io -10 +10 mA ESD tolerance, human body model - 2 - KV Block Diagram & Pad Descriptions I2C Register Figure 1 ALS-PDIC17-57B/TR8 Functional Block Diagram Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 3 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Electrical and Optical Characteristics (Ta=25℃ ℃, VDD=3.3V) Parameter Symbol Supply current 2 I C output low voltage wavelength Response in dark environment Response to fluorescent lamp [Note1] Response to incandescent lamp [Note2] Min. Typ. Max. Units IDD Active mode - 0.4 0.5 mA IDDQ VOL Power-down mode - - 0.1 uA Io = 4mA - - 0.4 V Full scale - - 32,767 counts Tint = 100mS - - 44,200 Lux - 580 - nm - - 1 count 44 73 102 counts 65 108 151 counts Detection limit Peak sensitivity Test Conditions λp Rdark Rfrst Ricd Ev= 0lux, Tint = 100mS Ev= 100lux Tint = 100mS Ev= 100lx 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. DC Characteristics of I2C Signals in Standard and Fast Mode Parameter Symbol Power supply voltage (recommend) Low level input voltage VDD VIL High level input voltage VIH Hysteresis of Schmitt trigger inputs (VDD > 2V) Low level output voltage (open drain) at 3mA sink current (VDD > 2V) Output fall time from VIHMIN to VILMAX with a bus capacitance from 10pF to 400pF Input current of each IO pins with an input voltage between 0.1VDD and 0.9VDD Capacitance for each IO pin Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 Standard Mode Min. Max. 2.7 -0.5 5.5 1.0 VDDx0.6 Fast Mode Min. Max. 2.7 -0.5 [Note3] 5.5 1.0 VDDx0.6 [Note3] Unit V V V Vhys 0.05VDD - 0.05VDD - V VOL1 0 0.4 0 0.4 V tof - 250 20+0.1Cb 250 [Note2] [Note1] [Note2] II/P -10 10 -10 10 uA Ci - 10 - 10 pF 4 http://www.everlight.com Jun. 22, 2011 ns Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Notes: 1. 2. 3. Cb = capacitance of one bus line in pF The maximum tof for the I2C 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. The I2C bus operation voltage is 1.8V, The ALS-PDIC17-57B supply voltage must 3V (3Vx0.6=1.8V) ≦ AC Characteristics of I2C Signals in Standard and Fast Mode Parameter Symbol I2C clock frequency Hold time (repeated) START condition. After this period, the first clock pulse is generated. Low period of I2C clock High period of I2C clock Set-up time for a repeated START condition Data hold time for I2C-bus devices Data set-up time Rise time of both I2C data and clock signal’s Fall time of both I2C data and clock signal’s Set-up time for STOP condition Bus free time between STOP and START condition Capacitive load for each bus line Standard Mode Min. Max. fSCL 0 tHD;STA 100 Fast Mode Min. max. Unit 0 400 KHz 4.0 0.6 - us tLOW tHIGH 4.7 4.0 1.3 0.6 us us tSU;STA 4.7 0.6 us tHD;DAT tSU;DAT 0 250 3.45 - 0 100 0.9 - us ns tr - 1000 5 300 ns tf - 300 0.1 300 ns tSU;STO 4.0 - 0.6 - us tBUF 4.7 - 1.3 - us Cb - 400 - 400 pF Figure 2 I2C Timing Diagram Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 5 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Typical Electrical and Optical Characteristics Curves Fig 3 Light Output vs. Illuminance Fig 4 Current Consumption vs. Illuminance Fig 5 Current Consumption vs. Supply Voltage Fig 6 Light Output vs. Supply Voltage Fig 7 Light Output vs. Supply Voltage Fig 8 Current Consumption vs. Temperature Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 6 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Fig 9 Light Output vs. Temperature Fig 10 Light Output vs. Temperature Fig 11 Spectrum Fig 12 Relative Sensitivity vs. Angle Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 7 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C 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 C 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. 2 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 S 7 Slave Address 1 WR 0 1 A 0 8 Command Byte 1 A 0 1 RD 1 1 A 0 8 Data 1 NA 1 1 P (a) Send byte protocol 1 S 7 Slave Address 1 P (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 A = acknowledge P = stop condition NA = not acknowledge Shaded = slave transmission WR = write RD= read Figure 13 Communication Protocol Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 8 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Communication Format ALS-PDIC17-57B is capable of working as an I2C slave. Address of this device on I2C bus is always 0x29 (hexadecimal number 29). Registers of the slave device can be programmed by sending commands over I2C bus. Figure 14 shows an I2C write operation. To write to an internal register of the slave device a command must be sent by an I2C master. As illustrated in Figure 14, the I2C write command begins with a start condition. After the start condition, seven bits of address are sent with MSB going first. RD / WRn (=Low) command bit follows the address bits. Upon receiving a valid address the slave device responds by driving SDA low for an ACK. After receiving an ACK, I2C master sends eight bits of data with MSB first. Upon receiving eight bits of data the slave device generates an ACK. I2C master terminates this write command with a stop condition. Figure 14 I2C Timing Diagram for Send Byte Format Figure 15 shows an I2C read command sent by the master to the slave device. I2C read command begins with a start condition. After the start condition seven bits of address are sent by the master with MSB going first. After the address bits, RD / WRn command bit is sent. For a read command the RD / WRn bits is high. Upon receiving the address bits and RD / WRn command bits the slave device responds with an ACK. After sending an ACK, the slave device sends eight bits of data with MSB going first. After receiving the one byte data, the I2C master terminates this transaction by issuing a NACK command to indicate that the master only wanted to read one byte from the device. The master generates a stop condition to end this transaction. Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 9 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Figure 15 I2C Timing Diagram for Receive Byte Format 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 Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 10 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C 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. 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 photonic transfer function, V(λ), which is the mathematic expression of human-eye's response to ambient light. Address Option for I2C The I2C address is determined before placing an order; the default 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 divided into two groups; D[15..8] is the most significant (MS) byte and D[7..0] is the least significant (LS) byte. See Table 1 for details. Table 1 ADC Register Structure Valid Bit D15 Data Bits D14 D13 ~ D8 MSB Most Significant (MS) byte Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 11 D7~D1 D0 LSB Least Significant (LS) byte http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Device Command There are eight 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 Function Code Shut-down mode, this is the default state after applying VDD power to 1xxx_xxxx (binary code) 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. Activate the ambient light sensor and put the device in [one time 0x04 integration mode]. The integration time is controlled by I2C commands, start and stop integration. Start integration: This command will reset the ADC register to 0x0000 0x08 and begin a new integration in [one time integration mode]. Stop integration: This command will stop the integration in [one time 0x30 0x34 integration mode] and set the valid bit (D[15]) high. Reserved for future expansion. 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 and put the device into "one time integration mode". (3). I2C master sends a "start integration command" to the salve device by issuing Send Byte protocol with the device address 0x29 followed by a command byte of 0x08. Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 12 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 (4). After a period of user defined integration time, I2C master sends a "stop integration command" to the salve 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) 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 to nx16.66ms (n = 1, 2...ni) is zero. Similarly, setting the ALS-PDIC17-57B integration time to an integer multiple of periodic noise signal greatly improves the light sensor output signal in the presence of noise. The maximum detection range is inversely proportional to the integration time; that means the longer integration time the lower detection range. (See Table 3) Table 3 Detection Range Guide Integration time Detection range Resolution ( mS ) ( Lux ) ( 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 Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 13 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Power Supply Decoupling and Layout 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 I2C 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, 2.7V ~ 5.5V Figure 17 Application Circuit Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 14 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C 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: 192 hours at 40°C +5/–0°C and < 5 % RH (reeled/tubed/loose units) or 96 hours at 60°C ± 5°C and < 5 % RH (reeled/tubed/loose units) or 24 hours at 125°C ± 5°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. Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 15 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Soldering Iron ℃ Each terminal is to go to the tip of soldering iron temperature less than 350 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. Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 16 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Packing Quantity Specification 2000 PCS/ 1 Reel Label Format 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 Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 17 http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C Digital Ambient Light Sensor ALS-PDIC17-57B/TR8 Reel Dimensions Unit: mm Tolerance: ±0.1 Tape Dimensions W E F D0 D1 P0 8.00±0.2 1.75±0.1 3.50±0.05 1.50+0.1/-0 1.00±0.1 P1 P2 t A0 B0 4.00±0.05 K0 4.00±0.1 2.00±0.05 0.23±0.05 2.15±0.05 2.15±0.05 0.95±0.05 Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 18 Unit: mm http://www.everlight.com Jun. 22, 2011 Surface - Mount 2 I C 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. Everlight Electronics Co., Ltd. Document No: DLS-00000xx Rev0.1 19 http://www.everlight.com Jun. 22, 2011