OPT3002DNPT

Order Now Product Folder Support & Community Tools & Software Technical Documents OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 OPT3002 Light-to-Digital Sensor 1 Features 3 Description • • The OPT3002 light-to-digital sensor provides the functionality of an optical power meter within a single device. This optical sensor greatly improves system performance over photodiodes and photoresistors. The OPT3002 has a wide spectral bandwidth, ranging from 300 nm to 1000 nm. Measurements can be made from 1.2 nW/cm2 up to 10 mW/cm2, without the need to manually select the full-scale ranges by using the built-in, full-scale setting feature. This capability allows light measurement over a 23-bit effective dynamic range. The results are compensated for dark-current effects, as well as other temperature variations. Wide Optical Spectrum: 300 nm to 1000 nm Automatic Full-Scale Setting Feature Simplifies Software and Configuration Measurement Levels: – 1.2 nW/cm2 to 10 mW/cm2 23-Bit Effective Dynamic Range With Automatic Gain Ranging 12 Binary-Weighted, Full-Scale Range Settings: < 0.2% (typ) Matching Between Ranges Low Operating Current: 1.8 µA (typ) Operating Temperature: –40°C to +85°C Wide Power-Supply: 1.6 V to 3.6 V 5.5-V Tolerant I/O Flexible Interrupt System Small Form Factor: 2.0 mm × 2.0 mm × 0.65 mm 1 • • • • • • • • • 2 Applications • • • • • • • • Intrusion and Door-Open Detection Systems System Wake-Up Circuits Medical and Scientific Instrumentation Display Backlight Controls Lighting Control Systems Tablet and Notebook Computers Thermostats and Home Automation Appliances Outdoor Traffic and Street Lights Use the OPT3002 in optical spectral systems that require detection of a variety of wavelengths, such as optically-based diagnostic systems. The interrupt pin system can summarize the result of the measurement with one digital pin. Power consumption is very low, allowing the OPT3002 to be used as a low-power, battery-operated, wake-up sensor when an enclosed system is opened. The OPT3002 is fully integrated and provides optical power reading directly from the I2C- and SMBuscompatible, two-wire, serial interface. Measurements are either continuous or single-shot. The OPT3002 fully-operational power consumption is as low as 0.8 µW at 0.8 SPS on a 1.8-V supply. Device Information(1) PART NUMBER PACKAGE OPT3002 USON (6) BODY SIZE (NOM) 2.00 mm x 2.00 mm (1) For all available packages, see the package option addendum at the end of the datasheet. Spectral Response Block Diagram VDD 1 OPT3002 0.9 Normalized Response 0.8 VDD OPT3002 0.7 SCL 0.6 0.5 Light ADC I2C SDA Interface INT ADDR 0.4 0.3 0.2 GND 0.1 0 300 Copyright © 2016, Texas Instruments Incorporated 400 500 600 700 Wavelength (nm) 800 900 1000 D001 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com Table of Contents 1 2 3 4 5 6 7 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Pin Configuration and Functions ......................... Specifications......................................................... 1 1 1 2 3 4 6.1 6.2 6.3 6.4 6.5 6.6 6.7 4 4 4 4 5 6 7 Absolute Maximum Ratings ...................................... ESD Ratings.............................................................. Recommended Operating Conditions....................... Thermal Information .................................................. Electrical Characteristics........................................... Timing Requirements ................................................ Typical Characteristics .............................................. Detailed Description ............................................ 10 7.1 7.2 7.3 7.4 7.5 Overview ................................................................. Functional Block Diagram ...................................... Feature Description................................................. Device Functional Modes........................................ Programming........................................................... 10 10 11 13 16 7.6 Register Maps ......................................................... 19 8 Application and Implementation ........................ 26 8.1 Application Information............................................ 26 8.2 Do's and Don'ts ...................................................... 27 9 Power-Supply Recommendations...................... 27 10 Layout................................................................... 28 10.1 Layout Guidelines ................................................. 28 10.2 Layout Example .................................................... 28 11 Device and Documentation Support ................. 29 11.1 11.2 11.3 11.4 11.5 11.6 Documentation Support ........................................ Receiving Notification of Documentation Updates Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 29 29 29 29 29 29 12 Mechanical, Packaging, and Orderable Information ........................................................... 30 12.1 Soldering and Handling Recommendations.......... 30 12.2 DNP (S-PDSO-N6) Mechanical Drawings ............ 30 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Original (May 2016) to Revision A • 2 Page Released to production .......................................................................................................................................................... 1 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 5 Pin Configuration and Functions DNP Package 6-Pin USON Top View VDD 1 6 SDA ADDR 2 5 INT GND 3 4 SCL Not to scale Pin Functions PIN NO. NAME DESCRIPTION I/O 1 VDD Power 2 ADDR Digital input 3 GND Power 4 SCL Digital input 5 INT Digital output 6 SDA Digital input/output Device power. Connect to a 1.6-V to 3.6-V supply. Address pin. This pin sets the LSBs of the I2C address. Ground I2C clock. Connect with a 10-kΩ resistor to a 1.6-V to 5.5-V supply. Interrupt output open-drain. Connect with a 10-kΩ resistor to a 1.6-V to 5.5-V supply. I2C data. Connect with a 10-kΩ resistor to a 1.6-V to 5.5-V supply. Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 3 OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com 6 Specifications 6.1 Absolute Maximum Ratings (1) Voltage MIN MAX VDD to GND –0.5 6 SDA, SCL, INT, and ADDR to GND –0.5 6 Current into any pin (1) (2) V 10 Junction, TJ Temperature UNIT mA 150 Storage, Tstg °C 150 (2) –65 Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Long exposure to temperatures higher than 105°C can cause package discoloration, spectral distortion, and measurement inaccuracy. 6.2 ESD Ratings VALUE V(ESD) (1) (2) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) ±2000 Charged-device model (CDM), per JEDEC specification JESD22-C101 (2) ±500 UNIT V JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. 6.3 Recommended Operating Conditions MIN NOM MAX UNIT Operating power-supply voltage 1.6 3.6 V Operating temperature –40 85 °C 6.4 Thermal Information OPT3002 THERMAL METRIC (1) DNP (USON) UNIT 6 PINS RθJA Junction-to-ambient thermal resistance 71.2 °C/W RθJC(top) Junction-to-case (top) thermal resistance 45.7 °C/W RθJB Junction-to-board thermal resistance 42.2 °C/W ψJT Junction-to-top characterization parameter 2.4 °C/W ψJB Junction-to-board characterization parameter 42.8 °C/W RθJC(bot) Junction-to-case (bottom) thermal resistance 17.0 °C/W (1) 4 For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report. Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 6.5 Electrical Characteristics at TA = 25°C, VDD = 3.3 V, 800-ms conversion time (CT = 1) (1), automatic full-scale range (RN[3:0] = 1100b (1)), 505-nm LED stimulus, and normal-angle incidence of light (unless otherwise specified) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OPTICAL Peak irradiance spectral responsivity Resolution (LSB) at 505 nm Lowest full-scale range (FSR), RN[3:0] = 0000b (1) Full-scale illuminance at 505 nm Measurement output result 505-nm LED stimulus, FSR setting = 628,992 (nW/cm2), 153.6 (nW/cm2) per ADC code (RN[3:0] = 0111) (1) 2 klux white LED stimulus, FSR setting = 628,992 (nW/cm2), 153.6 (nW/cm2) per ADC code (RN[3:0] = 0111) (1) (3) nm 1.2 nW/cm2 (2) 10.064 mW/cm2 (2) 384,000 nW/cm2 (2) 2500 2250 Relative accuracy between gain ranges (4) 2500 ADC codes 2750 ADC codes 3 ADC codes 0.2% Infrared response (850 nm) relative to response at 505 nm (3) 20% 2 Linearity 505 2% Input illuminance > 5000 nW/cm Input illuminance < 5000 nW/cm2 5% 2 PSRR Dark condition, ADC output Lowest FSR, RN[3:0] = 0000b, 4914 (nW/cm ), 1.2 (nW/cm2) per ADC code Half-power angle 50% of full-power reading 60 Degrees Power-supply rejection ratio VDD at 3.6 V and 1.6 V 0.1 %/V (5) 0 POWER SUPPLY I2C pullup resistor operating range VI²C I2C pullup resistor, VDD ≤ VI²C Dark IQ Quiescent current Full-scale range POR Power-on-reset threshold 1.6 5.5 Active, VDD = 3.6 V 1.8 2.5 Shutdown (M[1:0] = 00) (1), VDD = 3.6 V 0.3 0.47 Active, VDD = 3.6 V 3.7 Shutdown, (M[1:0] = 00) (1) 0.4 TA = 25°C V µA 0.8 V DIGITAL I/O pin capacitance Total integration time (6) 3 pF (CT = 1) (1), 800-ms mode, fixed FSR 720 800 880 (CT = 0) (1), 100-ms mode, fixed FSR 90 100 110 ms VIL Low-level input voltage (SDA, SCL, and ADDR) 0 0.3 × VDD V VIH High-level input voltage (SDA, SCL, and ADDR) 0.7 × VDD 5.5 V IIL Low-level input current (SDA, SCL, and ADDR) 0.25 (7) µA VOL Low-level output voltage (SDA and INT) IOL = 3 mA 0.32 V IZH Output logic high, high-Z leakage current (SDA, INT) At VDD pin 0.25 (7) µA (1) (2) (3) (4) (5) (6) (7) 0.01 0.01 Refers to a control field within the configuration register. All nW/cm2 units assume a 505-nm stimulus. To scale the LSB size, full-scale, and results at other wavelengths, see the Compensation for the Spectral Response section. Tested with the white LED calibrated to 2 klux and an 850-nm LED. Characterized by measuring fixed near-full-scale light levels on the higher adjacent full-scale range setting. PSRR is the percent change of the measured optical power output from its current value, divided by the change in power-supply voltage, as characterized by results from the 3.6-V and 1.6-V power supplies. The conversion time, from start of conversion until data are ready to be read, is the integration time plus 3 ms. The specified leakage current is dominated by the production test equipment limitations. Typical values are much smaller. Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 5 OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com 6.6 Timing Requirements (1) MIN TYP MAX UNIT 0.4 MHz I2C FAST MODE fSCL SCL operating frequency 0.01 tBUF Bus free time between stop and start 1300 ns tHDSTA Hold time after repeated start 600 ns tSUSTA Setup time for repeated start 600 ns tSUSTO Setup time for stop 600 ns tHDDAT Data hold time 20 tSUDAT Data setup time 100 ns tLOW SCL clock low period 1300 ns tHIGH SCL clock high period 600 tRC and tFC Clock rise and fall time 300 ns tRD and tFD Data rise and fall time 300 ns tTIMEO Bus timeout period. If the SCL line is held low for this duration of time, then the bus state machine is reset. 900 ns ns 28 ms 2 I C HIGH-SPEED MODE fSCL SCL operating frequency 0.01 tBUF Bus free time between stop and start 160 ns tHDSTA Hold time after repeated start 160 ns tSUSTA Setup time for repeated start 160 ns tSUSTO Setup time for stop 160 tHDDAT Data hold time 20 tSUDAT Data setup time 20 ns tLOW SCL clock low period 240 ns tHIGH SCL clock high period 60 tRC and tFC Clock rise and fall time 40 ns tRD and tFD Data rise and fall time 80 ns tTIMEO Bus timeout period. If the SCL line is held low for this duration of time, then the bus state machine is reset. (1) 2.6 MHz ns 140 ns ns 28 ms All timing parameters are referenced to low and high voltage thresholds of 30% and 70%, respectively, of the final settled value. 1/fSCL tRC tFC 70% 30% SCL tLOW tHDDAT tHIGH tSUDAT tSUSTA tHDSTA tSUSTO 70% 30% SDA tBUF Stop Start tRD tFD Start Stop Figure 1. I2C Detailed Timing Diagram 6 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 6.7 Typical Characteristics at TA = 25°C, VDD = 3.3 V, 800-ms conversion time (CT = 1), automatic full-scale range (RN[3:0] = 1100b), white LED, and normal-angle incidence of light (unless otherwise specified) 1 1.020 OPT3002 0.9 1.010 0.7 Relative Response Normalized Response 0.8 0.6 0.5 0.4 0.3 1.000 1.000 1.001 1.002 1.001 1.002 0.997 0.997 39312 78624 157248 314496 0.990 0.2 0.1 0 300 400 500 600 700 Wavelength (nm) 800 900 0.980 1000 4914 9828 19656 Full-Scale Range ( nW/cm2) D001 D006 Input illuminance = 3960 nW/cm2, normalized to response of 4914 nW/cm2 full-scale Figure 2. Spectral Response vs Wavelength Figure 3. Full-Scale-Range Matching (Lowest 7 Ranges) 10 Dark Output Response (nW/cm2) 1.020 Relative Response 1.010 1.000 1.000 1.002 1.003 1.004 1.002 1.000 0.990 9 8 7 6 5 4 3 2 1 0 -40 0.980 314496 628992 1257984 2515968 5031936 10063872 Full-Scale Range (nW/cm2) -20 0 D007 Input illuminance = 298,800 nW/cm , normalized to response of 314,496 nW/cm2 full-scale 80 100 D0016 Figure 5. Dark Response vs Temperature Figure 4. Full-Scale-Range Matching (Highest 6 Ranges) 1.2 1000 400nm 550nm 700nm 1.1 Conversion Time (ms) Normalized Response 60 Average of 30 devices 2 1.15 20 40 Temperature (qC) 1.05 1 0.95 0.9 900 800 700 0.85 0.8 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Temperature [°C] D008 Figure 6. Normalized Response vs Temperature 600 1.6 2 2.4 2.8 Power Supply (V) 3.2 3.6 D017 Figure 7. Conversion Time vs Power Supply Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 7 OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com Typical Characteristics (continued) at TA = 25°C, VDD = 3.3 V, 800-ms conversion time (CT = 1), automatic full-scale range (RN[3:0] = 1100b), white LED, and normal-angle incidence of light (unless otherwise specified) 1 OPT3002 Normalized Response 1.002 Normalized Response 1.001 1 0.999 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.998 1.6 2 2.4 2.8 Power Supply (V) 3.2 0 -80 3.6 0.5 3.5 0.45 3 2.5 2 60 80 D010 0.4 0.35 0.3 0.2 1 10000 100000 1000000 Input Illuminance (nW/cm 2) 0 1E+7 2000000 4000000 6000000 8000000 Input Illuminance (nW/cm 2) D011 M[1:0] = 10b, illuminance derived from white LED 1E+7 1.2E+7 D011 D012 M[1:0] = 00b, illuminance derived from white LED Figure 10. Supply Current in Active State vs Input Illuminance Figure 11. Supply Current in Shutdown State vs Input Illuminance 3.5 1.6 Shutdown Supply Current (PA) Vdd = 3.3V Vdd = 1.6V 3 Supply Current (PA) -20 0 20 40 Incidence Angle (Degrees) 0.25 1.5 2.5 2 1.5 -20 0 20 40 Temperature (qC) 60 80 100 Vdd = 3.3V Vdd = 1.6V 1.4 1.2 1 0.8 0.6 0.4 0.2 -40 -20 D013 0 20 40 Temperature (qC) 60 80 100 D014 M[1:0] = 00b, input illuminance = 0 nW/cm2 M[1:0] = 10b Figure 12. Supply Current in Active State vs Temperature 8 -40 Figure 9. Normalized Response vs Incidence Angle 4 Supply Current (PA) Supply Current (PA) Figure 8. Normalized Response vs Power-Supply Voltage 1 -40 -60 D009 Figure 13. Supply Current in Shutdown State vs Temperature Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 Typical Characteristics (continued) at TA = 25°C, VDD = 3.3 V, 800-ms conversion time (CT = 1), automatic full-scale range (RN[3:0] = 1100b), white LED, and normal-angle incidence of light (unless otherwise specified) 100 Shutdown Current (PA) Vdd = 3.3V Vdd = 1.6V 10 1 0.1 0.01 0.1 1 10 100 1000 Continuous I2C Frequency (KHz) 10000 D015 SCL = SDA, continuously toggled at I2C frequency Note: A typical application runs at a lower duty cycle and thus consumes a lower current. Figure 14. Supply Current in Shutdown State vs Continuous I2C Frequency Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 9 OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com 7 Detailed Description 7.1 Overview The OPT3002 measures the light that illuminates the device within the device spectral range of 300 nm to 1000 nm. The OPT3002 is fully self-contained to measure the ambient light and report the result digitally over the I2C bus. The result can also be used to alert a system and interrupt a processor with the INT pin. The result can also be summarized with a programmable window comparison and communicated with the INT pin. The OPT3002 can be configured into an automatic full-scale, range-setting mode that always selects the optimal full-scale range setting for the lighting conditions. This mode automatically selects the optimal full-scale range for the given lighting condition, thus eliminating the requirement of programming many measurement and readjustment cycles of the full-scale range. The device can operate continuously or in single-shot measurement modes. The device integrates its result over either 100 ms or 800 ms, so the effects of 50-Hz and 60-Hz noise sources from typical light bulbs are nominally reduced to a minimum. The device starts up in a low-power shutdown state, such that the OPT3002 only consumes active-operation power after being programmed into an active state. 7.2 Functional Block Diagram VDD VDD OPT3002 SCL Light ADC I2C SDA Interface INT ADDR GND Copyright © 2016, Texas Instruments Incorporated 10 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 7.3 Feature Description 7.3.1 Automatic Full-Scale Range Setting The OPT3002 has an automatic full-scale range setting feature that eliminates the need to predict and set the optimal range for the device. In this mode, the OPT3002 automatically selects the optimal full-scale range for the given lighting condition. The OPT3002 has a high degree of result matching between the full-scale range settings. This matching eliminates the problem of varying results or the need for range-specific, user-calibrated gain factors when different full-scale ranges are chosen. For further details, see the Automatic Full-Scale Setting Mode section. 7.3.2 Interrupt Operation, INT Pin, and Interrupt Reporting Mechanisms The device has an interrupt reporting system that allows the processor connected to the I2C bus to go to sleep, or otherwise ignore the device results, until a user-defined event occurs that requires possible action. Alternatively, this same mechanism can also be used with any system that can take advantage of a single digital signal that indicates whether the light is above or below the levels of interest. The interrupt event conditions are controlled by the high-limit and low-limit registers, as well as the configuration register latch and fault count fields. The results of comparing the result register with the high-limit register and low-limit register are referred to as fault events. The fault count field (configuration register, bits FC[1:0]) dictates how many consecutive same-result fault events are required to trigger an interrupt event and subsequently change the state of the interrupt reporting mechanisms (that is, the INT pin, the flag high field, and the flag low field). The latch field allows a choice between a latched window-style comparison and a transparent hysteresisstyle comparison. The INT pin has an open-drain output that requires the use of a pullup resistor. This open-drain output allows multiple devices with open-drain INT pins to be connected to the same line, thus creating a logical NOR or AND function between the devices. The polarity of the INT pin can be controlled with the polarity of the interrupt field in the configuration register. When the POL field is set to 0, the pin operates in an active low behavior that pulls the pin low when the INT pin becomes active. When the POL field is set to 1, the pin operates in an active high behavior and becomes high impedance, thus allowing the pin to go high when the INT pin becomes active. Additional details of the interrupt reporting registers are described in the Interrupt Reporting Mechanism Modes and Internal Registers sections. Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 11 OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com Feature Description (continued) 7.3.3 I2C Bus Overview The OPT3002 offers compatibility with both I2C and SMBus interfaces. The I2C and SMBus protocols are essentially compatible with one another. The I2C interface is used throughout this document as the primary example with the SMBus protocol specified only when a difference between the two protocols is discussed. The OPT3002 is connected to the bus with two pins: an SCL clock input pin and an SDA open-drain bidirectional data pin. The bus must be controlled by a master device that generates the serial clock (SCL), controls the bus access, and generates start and stop conditions. To address a specific device, the master initiates a start condition by pulling the data signal line (SDA) from a high logic level to a low logic level when SCL is high. All slaves on the bus shift in the slave address byte on the SCL rising edge, with the last bit indicating whether a read or write operation is intended. During the ninth clock pulse, the slave being addressed responds to the master by generating an acknowledge bit by pulling SDA low. Data transfer is then initiated and eight bits of data are sent, followed by an acknowledge bit. During data transfer, SDA must remain stable when SCL is high. Any change in SDA when SCL is high is interpreted as a start or stop condition. When all data are transferred, the master generates a stop condition, as indicated by pulling SDA from low to high when SCL is high. The OPT3002 includes a 28-ms timeout on the I2C interface to prevent locking up the bus. If the SCL line is held low for this duration of time, then the bus state machine is reset. 7.3.3.1 Serial Bus Address To communicate with the OPT3002, the master must first initiate an I2C start command. Then, the master must address slave devices via a slave address byte. The slave address byte consists of seven address bits and a direction bit that indicates whether the action is to be a read or write operation. Four I2C addresses are possible by connecting the ADDR pin to one of four pins: GND, VDD, SDA, or SCL. Table 1 summarizes the possible addresses with the corresponding ADDR pin configuration. The state of the ADDR pin is sampled on every bus communication and must be driven or connected to the desired level before any activity on the interface occurs. Table 1. Possible I2C Addresses with the Corresponding ADDR Configuration DEVICE I2C ADDRESS ADDR PIN 1000100 GND 1000101 VDD 1000110 SDA 1000111 SCL 7.3.3.2 Serial Interface The OPT3002 operates as a slave device on both the I2C bus and SMBus. Connections to the bus are made via the SCL clock input line and the SDA open-drain I/O line. The OPT3002 supports the transmission protocol for standard mode (up to 100 kHz), fast mode (up to 400 kHz), and high-speed mode (up to 2.6 MHz). All data bytes are transmitted most-significant bits first. The SDA and SCL pins feature integrated spike-suppression filters and Schmitt triggers to minimize the effects of input spikes and bus noise. See the Electrical Interface section for further details of the I2C bus noise immunity. 12 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 7.4 Device Functional Modes 7.4.1 Automatic Full-Scale Setting Mode The OPT3002 has an automatic full-scale-range setting mode that eliminates the need for a user to predict and set the optimal range for the device. This mode is entered when the configuration register range number field (RN[3:0]) is set to 1100b. The first measurement that the device takes in auto-range mode is a 10-ms range assessment measurement. The device then determines the appropriate full-scale range to take its first full measurement. For subsequent measurements, the full-scale range is set by the result of the previous measurement. If a measurement is towards the low side of full-scale, then the full-scale range is decreased by one or two settings for the next measurement. If a measurement is towards the upper side of full-scale, then the full-scale range is increased by one setting for the next measurement. If the measurement exceeds the full-scale range, resulting from a fast-increasing optical transient event, then the current measurement is aborted. This invalid measurement is not reported. A 10-ms measurement is taken to assess and properly reset the full-scale range. Then, a new measurement is taken with this proper full-scale range. Therefore, during a fast-increasing optical transient in this mode, a measurement can possibly take longer to complete and report than indicated by the configuration register conversion time field (CT). 7.4.2 Interrupt Reporting Mechanism Modes There are two major types of interrupt reporting mechanism modes: latched window-style comparison mode and transparent hysteresis-style comparison mode. The configuration register latch field (L) (see the configuration register, bit 4) controls which of these two modes is used. An end-of-conversion mode is also associated with each major mode type. The end-of-conversion mode is active when the two most significant bits of the threshold low register are set to 11b. The mechanisms report via the flag high and flag low fields, the conversion ready field, and the INT pin. 7.4.2.1 Latched Window-Style Comparison Mode The latched window-style comparison mode is typically selected when using the OPT3002 to interrupt an external processor. In this mode, a fault is recognized when the input signal is above the high-limit register or below the low-limit register. When the consecutive fault events trigger the interrupt reporting mechanisms, these mechanisms are latched, thus reporting whether the fault is the result of a high or low comparison. These mechanisms remain latched until the configuration register is read, which clears the INT pin and flag high and flag low fields. The SMBus alert response protocol, described in detail in the SMBus Alert Response section, clears the pin but does not clear the flag high and flag low fields. The behavior of this mode, along with the conversion ready flag, is summarized in Table 2. Note that Table 2 does not apply when the two threshold low register MSBs (see the Transparent Hysteresis-Style Comparison Mode section for clarification on the MSBs) are set to 11b. Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 13 OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com Device Functional Modes (continued) Table 2. Latched Window-Style Comparison Mode: Flag Setting and Clearing Summary (1) (2) FLAG HIGH FIELD FLAG LOW FIELD INT PIN (3) CONVERSION READY FIELD The result register is above the high-limit register for fault count times; see the result register and the high-limit register for further details. 1 X Active 1 The result register is below the low-limit register for fault count times; see the result register and the low-limit register for further details. X 1 Active 1 The conversion is complete with fault count criterion not met X X X 1 OPERATION Configuration register read (4) 0 0 Inactive 0 Configuration register write, M[1:0] = 00b (shutdown) X X X X Configuration register write, M[1:0] > 00b (not shutdown) X X X 0 SMBus alert response protocol X X Inactive X (1) (2) (3) (4) X = no change from the previous state. The high-limit register is assumed to be greater than the low-limit register. If this assumption is incorrect, the flag high field and flag low field can take on different behaviors. The INT pin depends on the setting of the polarity field (POL). The INT pin is low when the pin state is active and POL = 0 (active low) or when the pin state is inactive and POL = 1 (active high). Immediately after the configuration register is read, the device automatically resets the conversion ready field to its 0 state. Thus, if two configuration register reads are performed immediately after a conversion completion, the first reads 1 and the second reads 0. 7.4.2.2 Transparent Hysteresis-Style Comparison Mode The transparent hysteresis-style comparison mode is typically used when a single digital signal is desired that indicates whether the input light is higher than or lower than a light level of interest. If the result register is higher than the high-limit register for a consecutive number of events set by the fault count field, then the INT line is set to active, the flag high field is set to 1, and the flag low field is set to 0. If the result register is lower than the lowlimit register for a consecutive number of events set by the fault count field, then the INT line is set to inactive, the flag low field is set to 1, and the flag high field is set to 0. The INT pin and flag high and flag low fields do not change state with configuration reads and writes. The INT pin and flag fields continually report the appropriate comparison of the light to the low-limit and high-limit registers. The device does not respond to the SMBus alert response protocol when in either of the two transparent comparison modes (configuration register, latch field = 0). The behavior of this mode, along with the conversion ready is summarized in Table 3. Note that Table 3 does not apply when the two threshold low register MSBs (LE[3:2] from Table 11) are set to 11. Table 3. Transparent Hysteresis-Style Comparison Mode: Flag Setting and Clearing Summary (1) (2) FLAG HIGH FIELD FLAG LOW FIELD INT PIN (3) CONVERSION READY FIELD The result register is above the high-limit register for fault count times; see the result register and the high-limit register for further details. 1 0 Active 1 The result register is below the low-limit register for fault count times; see the result register and the low-limit register for further details. 0 1 Inactive 1 The conversion is complete with fault count criterion not met X X X 1 OPERATION Configuration register read (4) X X X 0 Configuration register write, M[1:0] = 00b (shutdown) X X X X Configuration register write, M[1:0] > 00b (not shutdown) X X X 0 SMBus alert response protocol X X X X (1) (2) (3) (4) 14 X = no change from the previous state. The high-limit register is assumed to be greater than the low-limit register. If this assumption is incorrect, the flag high field and flag low field can take on different behaviors. The INT pin depends on the setting of the polarity field (POL). The INT pin is low when the pin state is active and POL = 0 (active low) or when the pin state is inactive and POL = 1 (active high). Immediately after the configuration register is read, the device automatically resets the conversion ready field to its 0 state. Thus, if two configuration register reads are performed immediately after a conversion completion, the first reads 1 and the second reads 0. Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 7.4.2.3 End-of-Conversion Mode An end-of-conversion indicator mode can be used when every measurement is desired to be read by the processor, prompted by the INT pin going active on every measurement completion. This mode is entered by setting the most significant two bits of the low-limit register (LE[3:2] from the low-limit register) to 11b. This endof-conversion mode is typically used in conjunction with the latched window-style comparison mode. The INT pin becomes inactive when the configuration register is read or the configuration register is written with a nonshutdown parameter or in response to an SMBus alert response. Table 4 summarizes the interrupt reporting mechanisms as a result of various operations. Table 4. End-of-Conversion Mode When in Latched Window-Style Comparison Mode: Flag Setting and Clearing Summary (1) FLAG HIGH FIELD FLAG LOW FIELD INT PIN (2) CONVERSION READY FIELD The result register is above the high-limit register for fault count times; see the result register and the high-limit register for further details. 1 X Active 1 The result register is below the low-limit register for fault count times; see the result register and the low-limit register for further details. X 1 Active 1 The conversion is complete with fault count criterion not met X X Active 1 OPERATION Configuration register read (3) 0 0 Inactive 0 Configuration register write, M[1:0] = 00b (shutdown) X X X X Configuration register write, M[1:0] > 00b (not shutdown) X X X 0 SMBus alert response protocol X X Inactive X (1) (2) (3) X = no change from the previous state. The INT pin depends on the setting of the polarity field (POL). The INT pin is low when the pin state is active and POL = 0 (active low) or when the pin state is inactive and POL = 1 (active high). Immediately after the configuration register is read, the device automatically resets the conversion ready field to its 0 state. Thus, if two configuration register reads are performed immediately after a conversion completion, the first reads 1 and the second reads 0. Note that when transitioning from end-of-conversion mode to the standard comparison modes (that is, programming LE[3:2] from 11b to 00b) when the configuration register latch field (L) is 1, a subsequent write to the configuration register latch field (L) to 0 is necessary in order to properly clear the INT pin. The latch field can then be set back to 1 if desired. 7.4.2.4 End-of-Conversion and Transparent Hysteresis-Style Comparison Mode The combination of end-of-conversion mode and transparent hysteresis-style comparison mode can also be programmed simultaneously. The behavior of this combination is shown in Table 5. Table 5. End-Of-Conversion Mode When in Transparent Hysteresis-Style Comparison Mode: Flag Setting and Clearing Summary (1) FLAG HIGH FIELD FLAG LOW FIELD INT PIN (2) CONVERSION READY FIELD The result register is above the high-limit register for fault count times; see the result register and the high-limit register for further details. 1 0 Active 1 The result register is below the low-limit register for fault count times; see the result register and the low-limit register for further details. 0 1 Active 1 The conversion is complete with fault count criterion not met X X Active 1 Configuration register read (3) X X Inactive 0 Configuration register write, M[1:0] = 00b (shutdown) X X X X Configuration register write, M[1:0] > 00b (not shutdown) X X Inactive 0 SMBus alert response protocol X X X X OPERATION (1) (2) (3) X = no change from the previous state. The INT pin depends on the setting of the polarity field (POL). The INT pin is low when the pin state is active and POL = 0 (active low) or when the pin state is inactive and POL = 1 (active high). Immediately after the configuration register is read, the device automatically resets the conversion ready field to its 0 state. Thus, if two configuration register reads are performed immediately after a conversion completion, the first reads 1 and the second reads 0. Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 15 OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com 7.5 Programming The OPT3002 supports the transmission protocol for standard mode (up to 100 kHz), fast mode (up to 400 kHz), and high-speed mode (up to 2.6 MHz). Fast and standard modes are described as the default protocol, referred to as F/S. High-speed mode is described in the High-Speed I2C Mode section. 7.5.1 Writing and Reading Accessing a specific register on the OPT3002 is accomplished by writing the appropriate register address during the I2C transaction sequence. See Table 6 for a complete list of registers and the corresponding register addresses. The value for the register address (as shown in Figure 15) is the first byte transferred after the slave address byte with the R/W bit low. 1 9 1 9 SCL SDA 1 0 0 0 Start by Master 1 A1 A0 R/W RA 7 RA 6 RA 5 RA 4 RA 3 RA 2 RA 1 ACK by OPT3002 Frame 1: Two-Wire Slave Address Byte (1) RA 0 ACK by OPT3002 Stop by Master (optional) Frame 2: Register Address Byte (1) The value of the slave address byte is determined by the ADDR pin setting; see Table 1. Figure 15. Setting the I2C Register Address Timing Diagram Writing to a register begins with the first byte transmitted by the master. This byte is the slave address with the R/W bit low. The OPT3002 then acknowledges receipt of a valid address. The next byte transmitted by the master is the address of the register that data are to be written to. The next two bytes are written to the register addressed by the register address. The OPT3002 acknowledges receipt of each data byte. The master can terminate the data transfer by generating a start or stop condition. When reading from the OPT3002, the last value stored in the register address by a write operation determines which register is read during a read operation. To change the register address for a read operation, a new partial I2C write transaction must be initiated. This partial write is accomplished by issuing a slave address byte with the R/W bit low, followed by the register address byte and a stop command. The master then generates a start condition and sends the slave address byte with the R/W bit high to initiate the read command. The next byte is transmitted by the slave and is the most significant byte of the register indicated by the register address. This byte is followed by an acknowledge from the master; then the slave transmits the least significant byte. The master acknowledges receipt of the data byte. The master can terminate the data transfer by generating a notacknowledge after receiving any data byte, or by generating a start or stop condition. If repeated reads from the same register are desired, continually sending the register address bytes is not necessary; the OPT3002 retains the register address until that number is changed by the next write operation. 16 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 Programming (continued) Figure 16 and Figure 17 show the write and read operation timing diagrams, respectively. Note that register bytes are sent most significant byte first, followed by the least significant byte. 1 9 9 1 1 9 1 9 SCL SDA 1 0 0 0 1 A1 A0 Start by Master RA 7 R/W RA 6 RA 5 RA 4 RA 3 RA 2 RA 1 RA 0 ACK by OPT3002 Frame 1 Two-Wire Slave Address Byte (1) D15 D14 D13 D12 D11 D10 D9 Frame 2 Register Address Byte D8 D7 D6 D5 D4 D3 D2 D1 D0 ACK by OPT3002 ACK by OPT3002 ACK by OPT3002 Frame 3 Data MSByte Stop by Master Frame 4 Data LSByte (1) The value of the slave address byte is determined by the setting of the ADDR pin; see Table 1. Figure 16. I2C Write Example Timing Diagram 1 9 1 9 1 9 SCL SDA 1 0 0 0 1 A1 A0 R/W Start by Master D15 D14 D13 D12 D11 D10 D9 ACK by OPT3002 Frame 1 Two-Wire Slave Address Byte (1) From OPT3002 D8 D7 D6 D5 ACK by Master Frame 2 Data MSByte D4 D3 D2 D1 From OPT3002 D0 No ACK Stop by by Master Master(2) Frame 3 Data LSByte (1) The value of the slave address byte is determined by the ADDR pin setting; see Table 1. (2) An ACK by the master can also be sent. Figure 17. I2C Read Example Timing Diagram 7.5.1.1 High-Speed I2C Mode When the bus is idle, both the SDA and SCL lines are pulled high by the pullup resistors or the active pullup devices. The master generates a start condition followed by a valid serial byte containing the high-speed (HS) master code 0000 1XXXb. This transmission is made in either standard mode or fast mode (up to 400 kHz). The OPT3002 does not acknowledge the HS master code but does recognize the code and switches its internal filters to support a 2.6-MHz operation. The master then generates a repeated start condition (a repeated start condition has the same timing as the start condition). After this repeated start condition, the protocol is the same as F/S mode, except that transmission speeds up to 2.6 MHz are allowed. Instead of using a stop condition, use repeated start conditions to secure the bus in HS mode. A stop condition ends the HS mode and switches all internal filters of the OPT3002 to support the F/S mode. 7.5.1.2 General-Call Reset Command The I2C general-call reset allows the host controller in one command to reset all devices on the bus that respond to the general-call reset command. The general call is initiated by writing to the I2C address 0 (0000 0000b). The reset command is initiated when the subsequent second address byte is 06h (0000 0110b). With this transaction, the device issues an acknowledge bit and sets all of its registers to the power-on-reset default condition. Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 17 OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com Programming (continued) 7.5.1.3 SMBus Alert Response The SMBus alert response provides a quick identification for which device issued the interrupt. Without this alert response capability, the processor does not know which device pulled the interrupt line when there are multiple slave devices connected. The OPT3002 is designed to respond to the SMBus alert response address, when in the latched window-style comparison mode (configuration register, latch field = 1). The OPT3002 does not respond to the SMBus alert response when in transparent mode (configuration register, latch field = 0). The response behavior of the OPT3002 to the SMBus alert response is shown in Figure 18. When the interrupt line to the processor is pulled to active, the master can broadcast the alert response slave address (0001 1001b). Following this alert response, any slave devices that generated an alert identify themselves by acknowledging the alert response and sending their respective I2C address on the bus. The alert response can activate several different slave devices simultaneously. If more than one slave attempts to respond, bus arbitration rules apply. The device with the lowest address wins the arbitration. If the OPT3002 loses the arbitration, then the device does not acknowledge the I2C transaction and its INT pin remains in an active state, prompting the I2C master processor to issue a subsequent SMBus alert response. When the OPT3002 wins the arbitration, the device acknowledges the transaction and sets its INT pin to inactive. The master can issue that same command again, as many times as necessary to clear the INT pin. See the Interrupt Reporting Mechanism Modes section for additional details of how the flags and INT pin are controlled. The master can obtain information about the source of the OPT3002 interrupt from the address broadcast in the above process. The flag high field (configuration register, bit 6) is sent as the final LSB of the address to provide the master additional information about the cause of the OPT3002 interrupt. If the master requires additional information, then the result register or the configuration register can be queried. The flag high and flag low fields are not cleared upon an SMBus alert response. INT 1 9 1 9 SCL SDA 0 0 0 1 1 0 0 Start By Master R/W 1 0 ACK By Device Frame 1 SMBus ALERT Response Address Byte 0 0 1 A1 A0 From Device FH(1) NACK By Master Stop By Master (2) Frame 2 Slave Address Byte (1) FH is the flag high field (FH) in the configuration register (see Table 10). (2) A1 and A0 are determined by the ADDR pin; see Table 1. Figure 18. SMBus Alert Response Timing Diagram 18 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 7.6 Register Maps 7.6.1 Internal Registers The device is operated over the I2C bus with registers that contain configuration, status, and result information. All registers are 16 bits long. There are four main registers: result, configuration, low-limit, and high-limit. There is also a manufacturer ID register. Table 6 lists these registers. Do not write or read registers that are not shown on this register map. Table 6. Register Map REGISTER ADDRESS (Hex) 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Result 00h E3 E2 E1 E0 R11 R10 R9 R8 R7 R6 R5 R4 R3 R2 R1 R0 Configuration 01h RN3 RN2 RN1 RN0 CT M1 M0 OVF CRF FH FL L POL ME FC1 FC0 Low-limit 02h LE3 LE2 LE1 LE0 TL11 TL10 TL9 TL8 TL7 TL6 TL5 TL4 TL3 TL2 TL1 TL0 High-limit 03h HE3 HE2 HE1 HE0 TH11 TH10 TH9 TH8 TH7 TH6 TH5 TH4 TH3 TH2 TH1 TH0 Manufacturer ID 7Eh ID15 ID14 ID13 ID12 ID11 ID10 ID9 ID8 ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 19 OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com 7.6.1.1 Register Descriptions 7.6.1.1.1 Result Register (address = 00h) This register contains the result of the most recent light-to-digital conversion. This 16-bit register has two fields: a 4-bit exponent and a 12-bit mantissa. Figure 19. Result Register (Read-Only) 15 E3 R-0h 14 E2 R-0h 13 E1 R-0h 12 E0 R-0h 11 R11 R-0h 10 R10 R-0h 9 R9 R-0h 8 R8 R-0h 7 R7 R-0h 6 R6 R-0h 5 R5 R-0h 4 R4 R-0h 3 R3 R-0h 2 R2 R-0h 1 R1 R-0h 0 R0 R-0h LEGEND: R = Read only; -n = value after reset Table 7. Result Register Field Descriptions Bit Field Type Reset Description 15-12 E[3:0] R 0h Exponent. These bits are the exponent bits. Table 8 provides further details. 11-0 R[11:0] R 000h Fractional result. These bits are the result in straight binary coding (zero to full-scale). Table 8. Result Register: Full-Scale Range (FSR) and LSB Size as a Function of Exponent Level E3 E2 E1 E0 FSR AT 505-nm WAVELENGTH (nW/cm2) LSB WEIGHT AT 505-nm WAVELENGTH (nW/cm2) 0 0 0 0 4,914 1.2 0 0 0 1 9,828 2.4 0 0 1 0 19,656 4.8 0 0 1 1 39,312 9.6 0 1 0 0 78,624 19.2 0 1 0 1 157,248 38.4 0 1 1 0 314,496 76.8 0 1 1 1 628,992 153.6 1 0 0 0 1,257,984 307.2 1 0 0 1 2,515,968 614.4 1 0 1 0 5,031,936 1,228.8 1 0 1 1 10,063,872 2,457.6 The formula to translate this register into optical power is given in Equation 1: Optical_Power = R[11:0] × LSB_Size where • LSB_Size = 2E[3:0] × 1.2 [nW/cm2] (1) LSB_Size can also be taken from Table 8. The complete optical power equation is shown in Equation 2: Optical_Power = (2E[3:0]) × R[11:0] × 1.2 [nW/cm2] 20 Submit Documentation Feedback (2) Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 A series of result register output examples with the corresponding LSB weight and resulting optical power are given in Table 9. Note that many combinations of exponents (E[3:0]) and fractional results (R[11:0]) can map onto the same optical power result, as shown in the examples of Table 9. Table 9. Examples of Decoding the Result Register into Optical Power FRACTIONAL RESULT (R[11:0], Hex) LSB WEIGHT AT 505-nm WAVELENGTH (nW/cm2, Decimal) 00h 001h 1.2 1.2 00h FFFh 1.2 4,914 456h 9.6 338,227.2 89Ah 153.6 629,145.6 800h 307.2 629,145.6 09h 400h 614.4 629,145.6 1010 0010 0000 0000b 0Ah 200h 1228.8 629,145.6 1011 0001 0000 0000b 0Bh 100h 2457.6 629,145.6 1011 0000 0000 0001b 0Bh 001h 2457.6 2457.6 1011 1111 1111 1111b 0Bh FFFh 2457.6 10,063,872 RESULT REGISTER (Bits 15-0, Binary) EXPONENT (E[3:0], Hex) 0000 0000 0000 0001b 0000 1111 1111 1111b 0011 0100 0101 0110b 03h 0111 1000 1001 1010b 07h 1000 1000 0000 0000b 08h 1001 0100 0000 0000b RESULTING OPTICAL POWER AT 505-nm WAVELENGTH (nW/cm2, Decimal) To compensate for the spectral response of the device, for input wavelengths other than 505 nm, see the Compensation for the Spectral Response section. Note that the exponent field can be disabled (set to zero) by enabling the exponent mask (configuration register, ME field = 1) and manually programming the full-scale range (configuration register, RN[3:0] < 1100b (0Ch)), allowing for simpler operation in a manually-programmed, full-scale mode. Calculating optical power from the result register contents only requires multiplying the result register by the LSB weight (in nW/cm2) associated with the specific programmed full-scale range (see Table 8). See the low-limit register for details. See the configuration register conversion time field (CT, bit 11) description for more information on optical power measurement resolution as a function of conversion time. 7.6.1.1.2 Configuration Register (address = 01h) [reset = C810h] This register controls the major operational modes of the device. This register has 11 fields, as documented in this section. If a measurement conversion is in progress when the configuration register is written, then the active measurement conversion immediately aborts. If the new configuration register directs a new conversion, then that conversion is subsequently started. Figure 20. Configuration Register 15 RN3 R/W-1h 14 RN2 R/W-1h 13 RN1 R/W-0h 12 RN0 R/W-0h 11 CT R/W-1h 10 M1 R/W-0h 9 M0 R/W-0h 8 OVF R-0h 7 CRF R-0h 6 FH R-0h 5 FL R-0h 4 L R/W-1h 3 POL R/W-0h 2 ME R/W-0h 1 FC1 R/W-0h 0 FC0 R/W-0h LEGEND: R/W = Read/Write; R = Read only; -n = value after reset Table 10. Configuration Register Field Descriptions Bit 15-12 Field RN[3:0] Type R/W Reset Description 0Ch Range number field (read or write). The range number field selects the full-scale optical power range of the device. The format of this field is the same as the result register exponent field (E[3:0]); see Table 8. When RN[3:0] is set to 1100b (0Ch), the device operates in automatic full-scale setting mode, as described in the Automatic Full-Scale Setting Mode section. In this mode, the automatically chosen range is reported in the result exponent (register 00h, E[3:0]). The device powers up as 1100 in automatic full-scale setting mode. Codes 1101b, 1110b, and 1111b (0Dh, 0Eh, and 0Fh) are reserved for future use. Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 21 OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com Table 10. Configuration Register Field Descriptions (continued) Bit 11 10-9 8 7 6 5 22 Field CT M[1:0] OVF CRF FH FL Type R/W R/W R R R R Reset Description 1h Conversion time field (read or write). The conversion time field determines the length of the light-to-digital conversion process. The choices are 100 ms and 800 ms. A longer integration time allows for a lower noise measurement. The conversion time also relates to the effective resolution of the data conversion process. The 800-ms conversion time allows for the fully specified optical power resolution. The 100-ms conversion time with full-scale ranges above 0101b for E[3:0] in the result and configuration registers also allows for the fully specified optical power resolution. The 100-ms conversion time with full-scale ranges below and including 0101b for E[3:0] can reduce the effective result resolution by up to three bits, as a function of the selected full-scale range. Range 0101b reduces by one bit. Ranges 0100b, 0011b, 0010b, and 0001b reduce by two bits. Range 0000b reduces by three bits. The result register format and associated LSB weight does not change as a function of the conversion time. 0 = 100 ms 1 = 800 ms 0h Mode of conversion operation field (read or write). The mode of conversion operation field controls whether the device is operating in continuous conversion, single-shot, or low-power shutdown mode. The default is 00b (shutdown mode), such that upon power-up, the device only consumes an operational level of power after appropriately programming the device. When single-shot mode is selected by writing 01b to this field, the field continues to read 01b when the device is actively converting. When the single-shot conversion is complete, the mode of conversion operation field is automatically set to 00b and the device is shut down. When the device enters shutdown mode, either by completing a single-shot conversion or by a manual write to the configuration register, there is no change to the state of the reporting flags (conversion ready, flag high, flag low) or the INT pin. These signals are retained for subsequent read operations when the device is in shutdown mode. 00 = Shutdown (default) 01 = Single-shot 10, 11 = Continuous conversions 0h Overflow flag field (read-only). The overflow flag field indicates when an overflow condition occurs in the data conversion process, typically because the light illuminating the device exceeds the programmed full-scale range of the device. Under this condition OVF is set to 1, otherwise OVF remains at 0. The field is reevaluated on every measurement. If the full-scale range is manually set (RN[3:0] field < 1100b), the overflow flag field can be set when the result register reports a value less than full-scale. This result occurs if the input light has a temporary high spike level that temporarily overloads the integrating ADC converter circuitry but returns to a level within range before the conversion is complete. Thus, the overflow flag reports a possible error in the conversion process. This behavior is common to integrating-style converters. If the full-scale range is automatically set (RN[3:0] field = 1100b), the only condition that sets the overflow flag field is if the input light is beyond the full-scale level of the entire device. When there is an overflow condition and the full-scale range is not at maximum, the OPT3002 aborts the current conversion, sets the full-scale range to a higher level, and starts a new conversion. The flag is set at the end of the process. This process repeats until there is either no overflow condition or until the full-scale range is set to its maximum range. 0h Conversion ready field (read-only). The conversion ready field indicates when a conversion completes. The field is set to 1 at the end of a conversion and is cleared (set to 0) when the configuration register is subsequently read or written with any value except for one containing the shutdown mode (mode of operation field, M[1:0] = 00b). Writing a shutdown mode does not affect the state of this field; see the Interrupt Reporting Mechanism Modes section for more details. 0h Flag high field (read-only). The flag high field (FH) identifies that the result of a conversion is larger than a specified level of interest. FH is set to 1 when the result is larger than the level in the high-limit register (register address 03h) for a consecutive number of measurements defined by the fault count field (FC[1:0]). See the Interrupt Reporting Mechanism Modes section for more details on clearing and other behaviors of this field. 0h Flag low field (read-only). The flag low field (FL) identifies that the result of a conversion is smaller than a specified level of interest. FL is set to 1 when the result is smaller than the level in the low-limit register (register address 02h) for a consecutive number of measurements defined by the fault count field (FC[1:0]). See the Interrupt Reporting Mechanism Modes section for more details on clearing and other behaviors of this field. Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 Table 10. Configuration Register Field Descriptions (continued) Bit 4 Field Type L 3 R/W POL 2 R/W ME 1-0 R/W FC[1:0] R/W Reset Description 1h Latch field (read or write). The latch field controls the functionality of the interrupt reporting mechanisms: the INT pin, the flag high field (FH), and flag low field (FL). This bit selects the reporting style between a latched window-style comparison and a transparent hysteresis-style comparison. 0 = The device functions in transparent hysteresis-style comparison operation, where the three interrupt reporting mechanisms directly reflect the comparison of the result register with the high- and low-limit registers with no user-controlled clearing event. See the Interrupt Operation, INT Pin, and Interrupt Reporting Mechanisms section for further details. 1 = The device functions in latched window-style comparison operation, latching the interrupt reporting mechanisms until a user-controlled clearing event. 0h Polarity field (read or write). The polarity field controls the polarity or active state of the INT pin. 0 = The INT pin reports active low, pulling the pin low upon an interrupt event. 1 = Operation of the INT pin is inverted, where the INT pin reports active high, becoming high impedance and allowing the INT pin to be pulled high upon an interrupt event. 0h Mask exponent field (read or write). The mask exponent field forces the result register exponent field (register 00h, bits E[3:0]) to 0000b when the full-scale range is manually set, which can simplify the processing of the result register when the full-scale range is manually programmed. This behavior occurs when the mask exponent field is set to 1 and the range number field (RN[3:0]) is set to less than 1100b. Note that the masking is only performed on the result register. When using the interrupt reporting mechanisms, the result comparison with the low-limit and high-limit registers is unaffected by the ME field. 0h Fault count field (read or write). The fault count field instructs the device as to how many consecutive fault events are required to trigger the interrupt reporting mechanisms: the INT pin, the flag high field (FH), and flag low field (FL). The fault events are described in the latch field (L), flag high field (FH), and flag low field (FL) descriptions. 00 = One fault count (default) 01 = Two fault counts 10 = Four fault counts 11 = Eight fault counts 7.6.1.1.3 Low-Limit Register (address = 02h) [reset = C0000h] This register sets the lower comparison limit for the interrupt reporting mechanisms: the INT pin, the flag high field (FH), and flag low field (FL), as described in the Interrupt Reporting Mechanism Modes section. Figure 21. Low-Limit Register 15 LE3 R/W-0h 14 LE2 R/W-0h 13 LE1 R/W-0h 12 LE0 R/W-0h 11 TL11 R/W-0h 10 TL10 R/W-0h 9 TL9 R/W-0h 8 TL8 R/W-0h 7 TL7 R/W-0h 6 TL6 R/W-0h 5 TL5 R/W-0h 4 TL4 R/W-0h 3 TL3 R/W-0h 2 TL2 R/W-0h 1 TL1 R/W-0h 0 TL0 R/W-0h LEGEND: R/W = Read/Write; -n = value after reset Table 11. Low-Limit Register Field Descriptions Bit Field Type Reset Description 15-12 LE[3:0] R/W 0h Exponent. These bits are the exponent bits. Table 12 provides further details. 11-0 TL[11:0] R/W 000h Result. These bits are the result in straight binary coding (zero to full-scale). The format of this register is nearly identical to the format of the result register. The low-limit register exponent (LE[3:0]) is similar to the result register exponent (E[3:0]). The low-limit register result (TL[11:0]) is similar to the result register result (R[11:0]). The equation to translate this register into the optical power threshold is given in Equation 3, which is similar to the equation for the result register, Equation 2. Optical_Power = 1.2 × (2LE[3:0]) × TL[11:0] (3) Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 23 OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com Table 12 gives the full-scale range and LSB size of the low-limit register. The detailed discussion and examples given for the result register apply to the low-limit register as well. Table 12. Low Limit Register: Full-Scale Range (FSR) and LSB Size as a Function of Exponent Level LE3 LE2 LE1 LE0 FSR AT 505-nm WAVELENGTH (nW/cm2) LSB WEIGHT AT 505-nm WAVELENGTH (nW/cm2) 0 0 0 0 4,914 1.2 0 0 0 1 9,828 2.4 0 0 1 0 19,656 4.8 0 0 1 1 39,312 9.6 0 1 0 0 78,624 19.2 0 1 0 1 157,248 38.4 0 1 1 0 314,496 76.8 0 1 1 1 628,992 153.6 1 0 0 0 1,257,984 307.2 1 0 0 1 2,515,968 614.4 1 0 1 0 5,031,936 1,228.8 1 0 1 1 10,063,872 2,457.6 NOTE The result and limit registers are all converted into optical power values internally for comparison. These registers can have different exponent fields. However, when using a manually-set, full-scale range (configuration register, RN < 0Ch, with mask enable (ME) active), programming the manually-set, full-scale range into the LE[3:0] and HE[3:0] fields can simplify the choice of programming the register. This simplification results in only having to consider the fractional result and not the exponent part of the result. 24 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 7.6.1.1.4 High-Limit Register (address = 03h) [reset = BFFFh] The high-limit register sets the upper comparison limit for the interrupt reporting mechanisms: the INT pin, the flag high field (FH), and flag low field (FL), as described in the Interrupt Operation, INT Pin, and Interrupt Reporting Mechanisms section. The format of this register is almost identical to the format of the low-limit register and the result register. To explain the similarity in more detail, the high-limit register exponent (HE[3:0]) is similar to the low-limit register exponent (LE[3:0]) and the result register exponent (E[3:0]). The high-limit register result (TH[11:0]) is similar to the low-limit result (TH[11:0]) and the result register result (R[11:0]). Note that the comparison of the high-limit register with the result register is unaffected by the ME bit. When using a manually-set, full-scale range with the mask enable (ME) active, programming the manually-set, full-scale range into the HE[3:0] bits can simplify the choice of values required to program into this register. The formula to translate this register into optical power is similar to Equation 3. The full-scale values are similar to Table 8. Figure 22. High-Limit Register 15 HE3 R/W-0h 14 HE2 R/W-0h 13 HE1 R/W-0h 12 HE0 R/W-0h 11 TH11 R/W-0h 10 TH10 R/W-0h 9 TH9 R/W-0h 8 TH8 R/W-0h 7 TH7 R/W-0h 6 TH6 R/W-0h 5 TH5 R/W-0h 4 TH4 R/W-0h 3 TH3 R/W-0h 2 TH2 R/W-0h 1 TH1 R/W-0h 0 TH0 R/W-0h LEGEND: R/W = Read/Write; -n = value after reset Table 13. High-Limit Register Field Descriptions Bit Field Type Reset Description 15-12 HE[3:0] R/W Bh Exponent. These bits are the exponent bits. 11-0 TH[11:0] R/W FFFh Result. These bits are the result in straight binary coding (zero to full-scale). 7.6.1.1.5 Manufacturer ID Register (address = 7Eh) [reset = 5449h] This register is intended to help identify the device. Figure 23. Manufacturer ID Register 15 ID15 R-0h 14 ID14 R-0h 13 ID13 R-0h 12 ID12 R-0h 11 ID11 R-0h 10 ID10 R-0h 9 ID9 R-0h 8 ID8 R-0h 7 ID7 R-0h 6 ID6 R-0h 5 ID5 R-0h 4 ID4 R-0h 3 ID3 R-0h 2 ID2 R-0h 1 ID1 R-0h 0 ID0 R-0h LEGEND: R = Read only; -n = value after reset Table 14. Manufacturer ID Register Field Descriptions Bit 15-0 Field Type Reset Description ID[15:0] R 5449h Manufacturer ID. The manufacturer ID reads 5449h. In ASCII code, this register reads TI. Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 25 OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information There are two categories of interface to the OPT3002: electrical and optical. 8.1.1 Electrical Interface The electrical interface is quite simple and is accomplished by connecting the OPT3002 I2C SDA and SCL pins to the same pins of an applications processor, microcontroller, or other digital processor. If that digital processor requires an interrupt resulting from an event of interest from the OPT3002, then connect the INT pin to either an interrupt or general-purpose I/O pin of the processor. There are multiple uses for this interrupt, including signaling the system to wake up from low-power mode, processing other tasks when waiting for an ambient light event of interest, or alerting the processor that a sample is ready to be read. Connect pullup resistors between a power supply appropriate for digital communication and the SDA and SCL pins (because they have open-drain output structures). If the INT pin is used, connect a pullup resistor to the INT pin. A typical value for these pullup resistors is 10 kΩ. The resistor choice can be optimized in conjunction to the bus capacitance to balance the system speed, power, noise immunity, and other requirements. The power supply and grounding considerations are discussed in the Power-Supply Recommendations section. Although spike suppression is integrated in the SDA and SCL pin circuits, use proper layout practices to minimize the amount of coupling into the communication lines. One possible introduction of noise occurs from capacitively coupling signal edges between the two communication lines themselves. Another possible noise introduction comes from other switching noise sources present in the system, especially for long communication lines. In noisy environments, shield communication lines to reduce the possibility of unintended noise coupling into the digital I/O lines that can be incorrectly interpreted. 8.1.2 Optical Interface The optical interface is physically located within the package, facing away from the printed circuit board (PCB), as specified by the Sensor Area in Figure 26. Physical components, such as a plastic housing and a window that allows light from outside of the design to illuminate the sensor, can help protect the OPT3002 and neighboring circuitry. Sometimes, a dark or opaque window is used to further enhance the visual appeal of the design by hiding the sensor from view. This window material is typically transparent plastic or glass. Any physical component that affects the light that illuminates the sensing area of a light sensor also affects the performance of that light sensor. Therefore, for optimal performance, make sure to understand and control the effect of these components. If a window is to be used, design its width and height to permit light from a sufficient field of view to illuminate the sensor. For best performance for non-collimated light, use a field of view of at least ±35°, or ideally ±45° or more. Understanding and designing the field of view is discussed further in the OPT3001: Ambient Light Sensor Application Guide application report. Light pipes can appear attractive for aiding in the optomechanical design that brings light to the sensor; however, do not use light pipes with any ambient light sensor unless the system designer fully understands the ramifications of the optical physics of light pipes within the full context of the design and the design objectives. For best results, illuminate the sensor area uniformly. 26 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 Application Information (continued) 8.1.3 Compensation for the Spectral Response If the input wavelength is known and compensation for the nominal spectral response of the device is desired, apply Equation 4. Optical_Power at Wavelength W = Optical_Power at 505 nm / R where • R is the relative response of the device from Figure 2 at wavelength W (4) For example, if the input wavelength is 700 nm, then Figure 2 illustrates that the relative response is 0.6. Building on an example from Table 9, if the OPT3002 result register is E[3:0] = 03h and R[11:0] = 456h, then the optical power for light at a 505-nm wavelength is 338,2287 nW/cm2. Equation 5 demonstrates the correction for a 700nm input. Note that this simple technique only works for a single wavelength input. Optical_Power for a 700-nm Input = 338,227 [ nW/cm2] / 0.6 = 563,712 [ nW/cm2] (5) 8.2 Do's and Don'ts As with any optical product, special care must be taken into consideration when handling the OPT3002. Although the OPT3002 has low sensitivity to dust and scratches, proper optical device handling procedures are still recommended. The optical surface of the device must be kept clean for optimal performance in both prototyping with the device and mass production manufacturing procedures. Tweezers with plastic or rubber contact surfaces are recommended to avoid scratches on the optical surface. Avoid manipulation with metal tools when possible. The optical surface must be kept clean of fingerprints, dust, and other optical-inhibiting contaminants. If the device optical surface requires cleaning, the use of de-ionized water or isopropyl alcohol is recommended. A few gentile brushes with a soft swab are appropriate. Avoid potentially abrasive cleaning and manipulating tools and excessive force that can scratch the optical surface. If the OPT3002 performs less than optimally, inspect the optical surface for dirt, scratches, or other optical artifacts. 9 Power-Supply Recommendations Although the OPT3002 has low sensitivity to power-supply issues, good practices are always recommended. For best performance, the OPT3002 VDD pin must have a stable, low-noise power supply with a 100-nF bypass capacitor close to the device and solid grounding. There are many options for powering the OPT3002 because the device current consumption levels are very low. Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 27 OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com 10 Layout 10.1 Layout Guidelines The PCB layout design for the OPT3002 requires a couple of considerations. Bypass the power supply with a capacitor placed close to the OPT3002. Note that optically reflective surfaces of components also affect the performance of the design. The three-dimensional geometry of all components and structures around the sensor must be taken into consideration to prevent unexpected results from secondary optical reflections. Placing capacitors and components at a distance of at least twice the height of the component is usually sufficient. The most optimal optical layout is to place all close components on the opposite side of the PCB from the OPT3002. However, this approach may not be practical for the constraints of every design. Electrically connecting the thermal pad to ground is recommended. This connection can be created either with a PCB trace or with vias to ground directly on the thermal pad itself. If the thermal pad contains vias, they are recommended to be of a small diameter (< 0.2 mm) to prevent them from wicking the solder away from the appropriate surfaces. An example PCB layout with the OPT3002 is shown in Figure 24. 10.2 Layout Example Bypass Capacitor OPT3002 To VDD Power Supply To Processor Copyright © 2016, Texas Instruments Incorporated Figure 24. Example PCB Layout with the OPT3002 28 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 11 Device and Documentation Support 11.1 Documentation Support 11.1.1 Related Documentation For related documentation see the following: • OPT3001: Ambient Light Sensor Application Guide (SBEA002) • OPT3002EVM User's Guide (SBOU160) • QFN/SON PCB Attachment Application Report (SLUA271) 11.2 Receiving Notification of Documentation Updates To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper right corner, click on Alert me to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document. 11.3 Community Resources The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers. Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support. 11.4 Trademarks E2E is a trademark of Texas Instruments. All other trademarks are the property of their respective owners. 11.5 Electrostatic Discharge Caution This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. 11.6 Glossary SLYZ022 — TI Glossary. This glossary lists and explains terms, acronyms, and definitions. Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 29 OPT3002 SBOS745A – MAY 2016 – REVISED JUNE 2016 www.ti.com 12 Mechanical, Packaging, and Orderable Information The following pages include mechanical packaging and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation. 12.1 Soldering and Handling Recommendations The OPT3002 is qualified for three soldering reflow operations as per JEDEC JSTD-020. Note that excessive heat can discolor the device and affect optical performance. See application report QFN/SON PCB Attachment for details on the soldering thermal profile and other information. If the OPT3002 must be removed from a PCB, discard the device and do not reattach. As with most optical devices, handle the OPT3002 with special care to ensure optical surfaces stay clean and free from damage. See the Do's and Don'ts section for more detailed recommendations. For best optical performance, solder flux and any other possible debris must be cleaned after soldering processes. 12.2 DNP (S-PDSO-N6) Mechanical Drawings Figure 25. Package Orientation Visual Reference of Pin 1 (Top View) 30 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 OPT3002 www.ti.com SBOS745A – MAY 2016 – REVISED JUNE 2016 DNP (S-PDSO-N6) Mechanical Drawings (continued) Top View 0.49 0.39 0.09 Side View Figure 26. Mechanical Outline Showing Sensing Area Location (Top and Side Views) Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Product Folder Links: OPT3002 31 PACKAGE OPTION ADDENDUM www.ti.com 10-Dec-2020 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) (4/5) (6) OPT3002DNPR ACTIVE USON DNP 6 3000 RoHS & Green NIPDAUAG Level-3-260C-168 HR -40 to 85 5B OPT3002DNPT ACTIVE USON DNP 6 250 RoHS & Green NIPDAUAG Level-3-260C-168 HR -40 to 85 5B (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of