NOA3315W

NOA3315W Digital Proximity Sensor with Dual Ambient Light Sensors and Interrupt Description The NOA3315W combines an advanced digital proximity sensor and LED driver with dual ambient light sensors (ALS) and tri−mode I2C interface with interrupt capability in an integrated monolithic device. Multiple power management features and very low active sensing power consumption directly address the power requirements of battery operated mobile phones and mobile internet devices. The proximity sensor measures reflected light intensity with a high degree of precision and excellent ambient light rejection. The NOA3315W enables a proximity sensor system with a 16:1 programmable LED drive current range and a 30 dB overall proximity detection range. The dual ambient light sensors include one with a photopic light filter and one with no filter. Both have dark current compensation and high sensitivity eliminating inaccurate light level detection and insuring proper backlight control even in the presence of dark cover glass. The NOA3315W is ideal for improving the user experience by enhancing the screen interface with the ability to measure distance for near/far detection in real time and the ability to respond to ambient lighting conditions to control display backlight intensity. Features • • • • • • • • Proximity detection distance threshold I2C • • • • programmable with 12−bit resolution and eight integration time ranges (16−bit effective resolution) Effective for Measuring Distances up to 200 mm and Beyond Excellent IR and Ambient Light Rejection including Sunlight (up to 50K lux) and CFL Interference Programmable LED Drive Current from 10 mA to 160 mA in 5 mA Steps, no External Resistor Required User Programmable LED Pulse Frequency © Semiconductor Components Industries, LLC, 2016 December, 2016 − Rev. 1 ORDERING INFORMATION Device NOA3315W Wafer Size Temp Range 200 mm wafer −40°C to 80°C • Dual ALS senses ambient light and provides 16−bit Device Very Low Power Consumption ♦ Stand−by current 2.8 mA (monitoring I2C interface only, Vdd = 3 V) ♦ ALS operational current 50 mA per sensor ♦ Proximity sensing average operational current 100 mA ♦ Average LED sink current 75 mA These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant Proximity Sensing • AMBIENT LIGHT PROXIMITY SENSOR Ambient Light Sensing • Proximity Sensor, LED Driver and Dual ALS in One • www.onsemi.com output counts on the I2C bus directly proportional to the ambient light intensity Photopic Spectral Response of ALS1 Nearly Matches Human Eye Broadband response of ALS2 supports compensation for spectral shifts encountered with different types of cover glass Dynamic Dark Current Compensation Linear Response over the Full Operating Range 3 ranges – 100 counts/lux, 10 counts/lux, 1 count/lux Senses Intensity of Ambient Light from 0.02 lux to 52k lux with 21−bit Effective Resolution (16−bit converter) Programmable Integration Times (50 ms, 100 ms, 200 ms, 400 ms) Additional Features • Programmable interrupt function including independent • • 1 upper and lower threshold detection or threshold based hysteresis for proximity and or ALS Level or Edge Triggered Interrupts Proximity persistence feature reduces interrupts by providing hysteresis to filter fast transients such as camera flash Publication Order Number: NOA3315W/D NOA3315W • Automatic power down after single measurement or • • • • No External Components Required except the IR LED continuous measurements with programmable interval time for both ALS and PS functions Wide Operating Voltage Range (2.3 V to 3.6 V) Wide Operating Temperature Range (−40°C to 80°C) I2C Serial Communication Port ♦ Standard mode – 100 kHz ♦ Fast mode – 400 kHz ♦ High speed mode – 3.4 MHz and Power Supply Decoupling Caps Applications • Senses human presence in terms of distance and senses ambient light conditions, saving display power in applications such as: ♦ Smart phones, mobile internet devices, MP3 players, GPS ♦ Mobile device displays and backlit keypads Figure 1. NOA3315W Application Block Diagram Table 1. PAD FUNCTION DESCRIPTION Pad Pad Name Description 1 VDD Power pad 2 VSS Ground pad 3 LED_GND 4 LED IR LED output pad 5 INT Interrupt output pad, open−drain 6 SDA Bi−directional data signal for communications with the I2C master 7 SCL External I2C clock supplied by the I2C master Ground pad for IR LED driver www.onsemi.com 2 NOA3315W Table 2. ABSOLUTE MAXIMUM RATINGS Rating Symbol Value Unit Input power supply VDD 4.0 V Input voltage range Vin −0.3 to VDD + 0.2 V Output voltage range Vout −0.3 to VDD + 0.2 V TJ(max) 100 °C TSTG −40 to 80 °C ESD Capability, Human Body Model (Note 1) ESDHBM 2 kV ESD Capability, Charged Device Model (Note 1) ESDCDM 500 V Moisture Sensitivity Level MSL 3 − Lead Temperature Soldering (Note 2) TSLD 260 °C Maximum Junction Temperature Storage Temperature Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. 1. This device incorporates ESD protection and is tested by the following methods: ESD Human Body Model tested per EIA/JESD22−A114 ESD Charged Device Model tested per ESD−STM5.3.1−1999 Latchup Current Maximum Rating: ≤ 100 mA per JEDEC standard: JESD78 2. For information, please refer to our Soldering and Mounting Techniques Reference Manual, SOLDERRM/D Table 3. OPERATING RANGES Rating Power supply voltage Symbol Min VDD 2.3 Typ Unit 3.6 V 5 mA Power supply current, stand−by mode (VDD = 3.0 V) IDDSTBY Power supply average current, ALS1 operating 100 ms integration time and 500 ms intervals IDDALS1 50 mA Power supply average current, ALS2 operating 100 ms integration time and 500 ms intervals IDDALS2 50 mA 100 mA Power supply average current, PS operating 300 ms integration time and 100 ms intervals LED average sink current, PS operating at 300 ms integration time and 100 ms intervals and LED current set at 50 mA I2C signal voltage (Note 3) 2.8 Max IDDPS 47 ILED 75 VDD_I2C 1.6 1.8 mA 2.0 V Low level input voltage (VDD_I2C related input levels) VIL −0.3 0.3 VDD_I2C V High level input voltage (VDD_I2C related input levels) VIH 0.7 VDD_I2C VDD_I2C + 0.2 V Hysteresis of Schmitt trigger inputs Vhys 0.1 VDD_I2C Low level output voltage (open drain) at 3 mA sink current (INT) VOL V 0.2 VDD_I2C V II −10 10 mA Output low current (INT) IOL 3 − mA Operating free−air temperature range TA −40 80 °C Input current of IO pin with an input voltage between 0.1 VDD and 0.9 VDD 3. The I2C interface is functional to 3.0 V, but timing is only guaranteed up to 2.0 V. High Speed mode is guaranteed to be functional to 2.0 V. www.onsemi.com 3 NOA3315W Table 4. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over 2.3 V < VDD < 3.6 V, 1.7 V < VDD_I2C < 1.9 V, −40°C < TA < 80°C, 10 pF < Cb < 100 pF) (See Note 4) Parameter LED pulse current Symbol Min ILED_pulse 10 Typ Max Unit 160 mA LED pulse current step size ILED_pulse_step LED pulse current accuracy ILED_acc −20 +20 % Interval Timer Tolerance Tolf_timer −35 +35 % Edge Triggered Interrupt Pulse Width PWINT SCL clock frequency Hold time for START condition. After this period, the first clock pulse is generated. Rise time of both SDA and SCL (input signals) (Note 5) Fall time of both SDA and SCL (input signals) (Note 5) Rise time of SDA output signal (Note 5) Fall time of SDA output signal (Note 5) Set−up time for STOP condition mS 50 fSCL_std 10 100 100 400 fSCL_hs 100 3400 THD;STA_std 4.0 − tHD;STA_fast 0.6 − tHD;STA_hs 0.160 − tLOW_std 4.7 − tLOW_fast 1.3 − tLOW_hs 0.160 − tHIGH_std 4.0 − tHIGH_fast 0.6 − tHIGH_hs 0.060 − tHD;DAT_d_std 0 3.45 tHD;DAT_d_fast 0 0.9 tHD;DAT_d_hs 0 0.070 tSU;DAT_std 250 − tSU;DAT_fast 100 − tSU;DAT_hs 10 tr_INPUT_std 20 1000 tr_INPUT_fast 20 300 tr_INPUT_hs 10 40 tf_INPUT_std 20 300 tf_INPUT_fast 20 300 tf_INPUT_hs 10 40 tr_OUT_std 20 300 tr_OUT_fast 20 + 0.1 Cb 300 tr_OUT_hs 10 80 tf_OUT_std 20 300 tf_OUT_fast 20 + 0.1 Cb 300 tf_OUT_hs 10 80 tSU;STO_std 4.0 − tSU;STO_fast 0.6 − tSU;STO_hs 0.160 − tBUF_std 4.7 − tBUF_fast 1.3 − tBUF_hs 0.160 − High period of SCL clock SDA Data set−up time mA fSCL_fast Low period of SCL clock SDA Data hold time 5 Bus free time between STOP and START condition www.onsemi.com 4 kHz mS mS mS mS nS nS nS nS nS mS mS NOA3315W Table 4. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over 2.3 V < VDD < 3.6 V, 1.7 V < VDD_I2C < 1.9 V, −40°C < TA < 80°C, 10 pF < Cb < 100 pF) (See Note 4) Parameter Symbol Min Capacitive load for each bus line (including all parasitic capacitance) (Note 6) Cb Noise margin at the low level (for each connected device − including hysteresis) Noise margin at the high level (for each connected device − including hysteresis) Typ Max Unit 10 100 pF VnL 0.1 VDD − V VnH 0.2 VDD − V 4. Refer to Figure 2 and Figure 3 for more information on AC characteristics. 5. The rise time and fall time are dependent on both the bus capacitance (Cb) and the bus pull−up resistor Rp. Max and min pull−up resistor values are determined as follows: Rp(max) = tr (max)/(0.8473 x Cb) and Rp(min) = (Vdd_I2C – Vol(max))/Iol. 6. Cb = capacitance of one bus line, maximum value of which including all parasitic capacitances should be less than 100 pF. Bus capacitance up to 400 pF is supported, but at relaxed timing. Table 5. OPTICAL CHARACTERISTICS (Unless otherwise specified, these specifications are for VDD = 3.0 V, TA = 25°C) Parameter Symbol Min Typ Max Unit AMBIENT LIGHT SENSOR 1 lp 560 nm Spectral response, low −3 dB lc_low 510 nm Spectral response, high −3 dB lc_high 610 nm Spectral response, peak (Note 7) Dynamic range DRALS Maximum Illumination (ALS operational but saturated) Ev_MAX Resolution, Counts per lux, Tint = 400 ms, Range = 0 (100 counts/lux) CR400 800 counts Resolution, Counts per lux, Tint = 100 ms, Range = 0 (100 counts/lux) CR100 200 counts Resolution, Counts per lux, Tint = 50 ms, Range = 0 (100 counts/lux) CR50 100 counts Illuminance responsivity, green 560 nm LED, Ev = 10 lux, Tint = 50 ms, Range = 0 (100 counts/lux) Rv_g10 1000 counts Illuminance responsivity, green 560 nm LED, Ev = 100 lux, Tint = 50 ms, Range = 0 (100 counts/lux) Rv_g100 10000 counts Dark current, Ev = 0 lux, Tint = 100 ms Rvd 0.02 0 0 52k lux 120k lux 3 counts PROXIMITY SENSOR (Note 8) Detection range, Tint = 4800 ms, ILED = 160 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), LED Modulation Frequency = 308 kHz, Sample Delay = 250 ns, SNR = 7:1 DPS_4800_WHITE_ MOD 200 mm Detection range, Tint = 4800 ms, ILED = 160 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 8:1 DPS_4800_WHITE_ 160 148 mm Detection range, Tint = 4800 ms, ILED = 25 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 8:1 DPS_4800_WHITE_ 25 66 mm Detection range, Tint = 2400 ms, ILED = 50 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 8:1 DPS_2400_WHITE_ 25 80 mm Detection range, Tint = 1800 ms, ILED = 75 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 8:1 DPS_1800_WHITE_ 75 88 mm Detection range, Tint = 1200 ms, ILED = 100 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 8:1 DPS_1200_WHITE_ 100 90 mm Detection range, Tint = 600 ms, ILED = 125 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 8:1 DPS_600_WHITE_ 125 88 mm Detection range, Tint = 600 ms, ILED = 100 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 8:1 DPS_600_WHITE_ 100 76 mm 7. Refer to Figure 4 for more information on spectral response. 8. Measurements performed with default modulation frequency and sample delay unless noted. www.onsemi.com 5 NOA3315W Table 5. OPTICAL CHARACTERISTICS (Unless otherwise specified, these specifications are for VDD = 3.0 V, TA = 25°C) Parameter Symbol Min Typ Max Unit PROXIMITY SENSOR (Note 8) Detection range, Tint = 300 ms, ILED = 150 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 8:1 DPS_300_WHITE_ 150 74 mm Detection range, Tint = 300 ms, ILED = 100 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 8:1 DPS_300_WHITE_ 100 62 mm Detection range, Tint = 150 ms, ILED = 100 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 8:1 DPS_150_WHITE_ 100 48 mm Detection range, Tint = 1200 ms, ILED = 100 mA, 860 nm IR LED (OSRAM SFH4650), Grey Reflector (RGB = 162, 162, 160), SNR = 6:1 DPS_1200_GREY_ 100 64 mm Detection range, Tint = 2400 ms, ILED = 150 mA, 860 nm IR LED (OSRAM SFH4650), Black Reflector (RGB = 16, 16, 15), SNR = 6:1 DPS_2400_BLACK_ 150 36 mm Saturation power level PDMAX 0.8 mW/cm2 Measurement resolution, Tint = 150 ms MR150 11 bits Measurement resolution, Tint = 300 ms MR300 12 bits Measurement resolution, Tint = 600 ms MR600 13 bits Measurement resolution, Tint = 1200 ms MR1200 14 bits Measurement resolution, Tint = 1800 ms MR1800 15 bits Measurement resolution, Tint = 2400 ms MR2400 15 bits Measurement resolution, Tint = 3600 ms MR3600 16 bits Measurement resolution, Tint = 4800 ms MR4800 16 bits 7. Refer to Figure 4 for more information on spectral response. 8. Measurements performed with default modulation frequency and sample delay unless noted. www.onsemi.com 6 NOA3315W Figure 2. AC Characteristics, Standard and Fast Modes Figure 3. AC Characteristics, High Speed Mode 1.0 Human Eye Standard ALS1 Counts OUTPUT CURRENT (normalized) 0.9 0.8 White LED (5600K) ALS2 Counts 0.7 Incandescent (2850K) 0.6 0.5 0.4 CFL (3000K) 0.3 0.2 Halogen (3350K) 0.1 0.0 200 300 400 500 600 700 800 900 1000 0.00 1100 0.20 0.40 0.60 0.80 1.00 Ratio WAVELENGTH (nm) Figure 4. ALS Spectral Response (Normalized) Figure 5. ALS1 Light Source Dependency (Normalized to White LED Light) www.onsemi.com 7 1.20 NOA3315W TYPICAL CHARACTERISTICS 1800 12K ALS1 Meas ALS1 Meas 1600 10K 8K ALS COUNTS ALS COUNTS 1400 6K ALS2 Meas 4K 1200 1000 800 ALS2 Meas 600 400 2K 200 0 0 0 100 200 300 400 500 600 700 0 40 60 80 100 EV (lux) EV (lux) Figure 6. ALS1 Linearity 0−700 lux Figure 7. ALS1 Linearity 0−100 lux 25 160 ALS1 Meas ALS1 Meas 140 20 ALS COUNTS 120 ALS COUNTS 20 100 80 60 ALS2 Meas 40 15 10 ALS2 Meas 5 20 0 0 0 2 4 6 8 0 10 0.5 1.0 1.5 2.0 EV (lux) EV (lux) Figure 8. ALS1 Linearity 0−10 lux Figure 9. ALS1 Linearity 0−2 lux -30 -20 -10 1.000 0 10 20 0.900 -40 30 -30 40 0.800 0.700 -50 0.400 -70 0.300 0.200 -80 -80 90 -90 100 -100 0.100 -90 -100 -110 110 -120 -130 180 0.400 70 0.300 0.200 80 170 160 90 0.000 100 110 120 -130 140 ALS1 60 0.500 -120 130 -140 -170 50 0.600 -110 120 -160 40 0.100 0.000 -150 30 0.700 -70 80 20 0.800 -60 70 10 0.900 -50 60 0.500 0 -10 1.000 -40 50 0.600 -60 -20 130 -140 150 140 -150 ALS2 -160 -170 180 ALS1 170 160 150 ALS2 Figure 11. ALS1 & ALS2 Vertical Response to White LED Light vs Angle (Source swept from LED pin (+905) to INT pin (−905)) Figure 10. ALS1 & ALS2 Horizontal Response to White LED Light vs Angle (Source swept from LED pin (+905) to VDD pin (−905)) www.onsemi.com 8 NOA3315W TYPICAL CHARACTERISTICS -30 -20 -10 1.000 0 10 20 0.900 -40 30 0.700 -50 0.400 -70 0.300 0.200 -80 -80 90 -90 100 -100 0.100 -90 -100 -110 110 -120 -140 170 160 70 0.300 80 90 100 110 120 130 -140 150 140 -150 -160 -170 180 170 160 150 Figure 13. PS Vertical Response to IR LED Light vs Angle (Source swept from LED pin (+905) to INT pin (−905)) 9K 160 mA 8K 160 mA 7K 12K 80 mA PS COUNT PS COUNT 0.400 -130 16K 10K 8K 6K 60 0.500 -120 Figure 12. PS Horizontal Response to IR LED Light vs Angle (Source swept from LED pin (+905) to VDD pin (−905)) 14K 0.600 0.000 140 180 50 0.200 130 -170 PS 40 -110 120 -130 -160 30 0.100 0.000 -150 20 0.700 -70 80 10 0.800 -60 70 0 0.900 -50 60 0.500 -10 1.000 -40 50 0.600 -60 -30 PS 40 0.800 -20 40 mA 6K 5K 80 mA 4K 3K 4K 20 mA 2K 2K 1K 0 10 mA 0 50 100 150 200 40 mA 20 mA 0 10 mA 0 250 50 100 150 200 DISTANCE (mm) DISTANCE (mm) Figure 14. PS Response vs. Distance and LED Current (1200 ms Integration Time, White Reflector (RGB = 220, 224, 223)) Figure 15. PS Response vs. Distance and LED Current (1200 ms Integration Time, Grey Reflector (RGB = 162, 162, 160)) 1200 45K 160 mA 4800 ms 40K 1000 800 600 PS COUNT PS COUNT 35K 80 mA 400 30K 25K 2400 ms 20K 15K 40 mA 150 ms 1200 ms 10K 200 20 mA 600 ms 5K 0 10 mA 0 300 ms 0 50 100 150 0 200 50 100 150 200 250 DISTANCE (mm) DISTANCE (mm) Figure 16. PS Response vs. Distance and LED Current (1200 ms Integration Time, Black Reflector (RGB = 16, 16, 15)) Figure 17. PS Response vs. Distance and Integration Time (80 mA LED Current, White Reflector (RGB = 220, 224, 223)) www.onsemi.com 9 NOA3315W TYPICAL CHARACTERISTICS 3500 2500 2.3 V 3.0 V 3.6 V 3000 Ambient CFL 3000K (2kLux) Halogen (40kLux) Incandescent (6kLux) White LED (7kLux) 2000 PS COUNT PS COUNT 2500 2000 1500 1500 1000 1000 500 500 0 0 0 50 150 200 0 250 50 100 150 200 250 DISTANCE (mm) DISTANCE (mm) Figure 18. PS Response vs. Distance and Supply Voltage (1200 ms Integration Time, 40 mA LED Current, White Reflector (RGB = 220, 224, 223)) Figure 19. PS Ambient Rejection (1200 ms Integration Time, 100 mA LED Current, White Reflector (RGB = 220, 224, 223)) 40 200 35 180 160 30 ALS + PS IDD (mA) 20 PS PS 120 100 15 10 ALS + PS 140 25 80 60 ALS 40 5 20 0 0 2.0 2.5 3.0 3.5 ALS 2.0 2.2 4.0 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 VDD (V) VDD (V) Figure 20. Supply Current vs. Supply Voltage ALS1 or ALS2 TINT = 100 ms, TR = 500 ms PS TINT = 300 ms, TR = 100 ms Figure 21. Supply Current vs. Supply Voltage ALS1 and ALS2 TINT = 100 ms, TR = 500 ms PS TINT = 1200 ms, TR = 50 ms 1.4 1 lux ALS RESPONSE (Normalized) IDD (mA) 100 1.2 10 lux 1.0 100 lux 0.8 0.6 0.4 0.2 0 0 10 20 30 40 50 60 70 80 TEMPERATURE (°C) Figure 22. ALS1 Response vs. Temperature www.onsemi.com 10 90 NOA3315W Description of Operation Proximity Sensor Architecture determine the pulse rate. The default is 0x10 (16) which results in an LED pulse frequency of 250 KHz (4 ms period). Values below 200 KHz and above 1 MHz are not recommended. Switching high LED currents can result in noise injected into the proximity sensor receiver causing inaccurate readings. The PS receiver has a user programmable delay from the LED edge to when the receiver samples the data (PS_SAMPLE_DELAY – register 0x0E). Longer delays may reduce the effect of switching noise but also reduce the sensitivity. Since the value of the delay is dependent on the pulse frequency, its value must be carefully computed. The value obviously cannot exceed the LED pulse width or there would be no sampling of the data when the LED is illuminated. There is also a minimum step size of 125 ns. The delay values are programmed as follows: 0 or 1: No delay 2−31: Selects (N−1)*125 ns N must be less than or equal to the PS_LED_FREQUENCY Value The default delay is 0x05 (500 ns) Table 6 shows some common LED pulse frequencies and sample delays and the resulting register values. NOA3315W combines an advanced digital proximity sensor, LED driver, dual ambient light sensors and a tri−mode I2C interface as shown in Figure 1. The LED driver draws a modulated current through the external IR LED to illuminate the target. The LED current is programmable over a wide range. The infrared light reflected from the target is detected by the proximity sensor photo diode. The proximity sensor employs a sensitive photo diode fabricated in ON Semiconductor’s standard CMOS process technology. The modulated light received by the on−chip photodiode is converted to a digital signal using a variable slope integrating ADC with a default resolution (at 300 ms) of 12−bits, unsigned. The signal is processed to remove all unwanted signals resulting in a highly selective response to the generated light signal. The final value is stored in the PS_DATA register where it can be read by the I2C interface. Proximity Sensor LED Frequency and Delay Settings The LED current modulation frequency is user selectable from approximately 128 KHz to 2 MHz using the PS_LED_FREQUENCY register. An internal precision 4 MHz oscillator provides the frequency reference. The 4 MHz clock is divided by the value in register 0x0D to Table 6. COMMON LED PULSE FREQUENCY SETTINGS LED Pulse Frequency (KHz) Sample Delay (ns) PS_LED_ FREQUENCY Register (0x0D) Value PS_SAMPLE_ DELAY Register (0x0E) Value 200 250 0x14 0x03 200 500 0x14 0x05 200 750 0x14 0x07 250 250 0x10 0x03 250 500 0x10 0x05 500 250 0x08 0x03 500 500 0x08 0x05 1000 250 0x04 0x03 Ambient Light Sensor Architecture The NOA3315W contains two ambient light sensors. The first ambient light sensor employs a photo diode with its own proprietary photopic filter limiting extraneous photons, and thus performing as a band pass filter on the incident wave front. The filter only transmits photons in the visible spectrum which are primarily detected by the human eye. The photo response of this sensor is as shown in Figure 4. The second ambient light sensor employs a similar photo diode but without a light filter. Either or both ALS can be enabled. When disabled, an ALS is put in power down mode. The ambient light signal detected by each photo diode is converted to a digital signal using a variable slope integrating ADC with a resolution of 16−bits, unsigned. The ADC values are stored in the ALS1_DATA and ALS2_DATA registers where they can be read by the I2C interface. Equation 1 shows the relationship of output counts Cnt as a function of integration constant Ik, integration time Tint (in seconds) and the intensity of the ambient light, IL(in lux), at room temperature (25°C) for ALS1. IL + C nt ǒIk @ TintǓ (eq. 1) Where: Ik = 1920 counts/lux*s (for fluorescent light) Ik = 2080 counts/lux*s (for incandescent light) Hence the intensity of the ambient fluorescent light (in lux): IL + www.onsemi.com 11 C nt ǒ1920 @ TintǓ (eq. 2) NOA3315W ǒ and the intensity of the ambient incandescent light (in lux): IL + C nt (eq. 3) ǒ2080 @ TintǓ 2000 (eq. 4) ǒ1920 @ 50 msǓ I L + 20.83 lux ALS Spectral Response Correction The ALS1 photopic filter has some IR leakage which results in higher ALS readings for light sources with higher IR content, such as incandescent lighting. For purely photopic light, ALS1 is very accurate and correction is not needed. For other light sources, or if the spectral response of the light is shifted by cover glass, etc., the ALS reading can be corrected by reading both ALS1 and ALS2 and applying an equation such as Device Address A[6:0] WRITE 011 0111 0 ACK 0 Ǔ Ǔ The equation shown does not work well for very low ALS1 and/or ALS2 values (a single count introduces a large correction factor), thus it is recommended that the correction not be applied if the ALS1 value is below 5 counts and/or the ALS2 value is 0. Likewise if ALS1 reaches 65535 counts, the equation will begin to be incorrect and thus should not be applied. To provide the best possible correction, the equation will change based on the spectral characteristics of the glass used between the sensor and the light source. The equation shown was chosen to provide the best fit of a number of different light sources with no filter glass used. For example let: Cnt = 2000 counts Tint = 50 ms Intensity of ambient fluorescent light, IL(in lux): IL + ǒ ALS + ALS1 @ 0.1 @ ALS1 ) 0.5 ALS2 I2C Interface The NOA3315W acts as an I2C slave device and supports single register and block register read and write operations. All data transactions on the bus are 8 bits long. Each data byte transmitted is followed by an acknowledge bit. Data is transmitted with the MSB first. Register Address D[7:0] ACK 0000 0110 0 Register Data D[7:0] ACK 0000 0000 0 0x6E 7 Start Condition 8 8 Figure 23. I2C Write Command Figure 23 shows an I2C write operation. Write transactions begin with the master sending an I2C start sequence followed by the seven bit slave address (NOA3315W = 0x37) and the write(0) command bit. The NOA3315W will acknowledge this byte transfer with an appropriate ACK. Next the master will send the 8 bit register address to be written to. Again the NOA3315W will acknowledge reception with an ACK. Finally, the master will begin sending 8 bit data segment(s) to be written to the Device Address A[6:0] WRITE 011 0111 0 0x6E ACK 0 7 NOA3315W register bank. The NOA3315W will send an ACK after each byte and increment the address pointer by one in preparation for the next transfer. Write transactions are terminated with either an I2C STOP or with another I2C START (repeated START). Figure 24 shows an I2C read command sent by the master to the slave device. Read transactions begin in much the same manner as the write transactions in that the slave address must be sent with a write(0) command bit. Register Address D[7:0] ACK 0000 0110 0 Register Data D[7:0] ACK 0000 0000 0 8 8 Start Condition Stop Condition Device Address Register Data [A] A[6:0] READ 011 0111 1 0x6F 7 Start Condition Stop Condition ACK 0 D[7:0] ACK bbbb bbbb 0 Register Data [A+1] D[7:0] NACK bbbb bbbb 1 8 8 Figure 24. I2C Read Command www.onsemi.com 12 Stop Condition NOA3315W performance characteristics of its I/O cells in preparation for I2C transactions at the I2C high speed data protocol rates. From then on, standard I2C commands may be issued by the master, including repeated START commands. When the I2C master terminates any I2C transaction with a STOP sequence, the master and all slave devices immediately revert back to standard/fast mode I/O performance. By using a combination of high−speed mode and a block write operation, it is possible to quickly initialize the NOA3315W I2C register bank. After the NOA3315W sends an ACK, the master sends the register address as if it were going to be written to. The NOA3315W will acknowledge this as well. Next, instead of sending data as in a write, the master will re−issue an I2C START (repeated start) and again send the slave address and this time the read(1) command bit. The NOA3315W will then begin shifting out data from the register just addressed. If the master wishes to receive more data (next register address), it will ACK the slave at the end of the 8 bit data transmission, and the slave will respond by sending the next byte, and so on. To signal the end of the read transaction, the master will send a NACK bit at the end of a transmission followed by an I2C STOP. The NOA3315W also supports I2C high−speed mode. The transition from standard or fast mode to high−speed mode is initiated by the I2C master. A special reserve device address is called for and any device that recognizes this and supports high speed mode immediately changes the NOA3315W Data Registers NOA3315W operation is observed and controlled by internal data registers read from and written to via the external I2C interface. Registers are listed in Table 7. Default values are set on initial power up or via a software reset command (register 0x01). The I2C Slave Address of the NOA3315W is 0x37. Table 7. NOA3315W Data Registers Address Type Name 0x00 R PART_ID 0x01 RW RESET Description NOA3315W part number and revision IDs Software reset control 0x02 RW INT_CONFIG 0x0D RW PS_LED_FREQUENCY Interrupt pin functional control settings 0x0E RW PS_SAMPLE_DELAY PS Sample Delay 0x0F RW PS_LED_CURRENT PS LED pulse current 0x10 RW PS_TH_UP_MSB PS Interrupt upper threshold, most significant bits PS LED Pulse Frequency 0x11 RW PS_TH_UP_LSB PS Interrupt upper threshold, least significant bits 0x12 RW PS_TH_LO_MSB PS Interrupt lower threshold, most significant bits 0x13 RW PS_TH_LO_LSB PS Interrupt lower threshold, least significant bits 0x14 RW PS_FILTER_CONFIG 0x15 RW PS_CONFIG 0x16 RW PS_INTERVAL PS Interval time configuration 0x17 RW PS_CONTROL PS Operation mode control 0x20 RW ALS_TH_UP_MSB ALS Interrupt upper threshold, most significant bits 0x21 RW ALS_TH_UP_LSB ALS Interrupt upper threshold, least significant bits 0x22 RW ALS_TH_LO_MSB ALS Interrupt lower threshold, most significant bits 0x23 RW ALS_TH_LO_LSB ALS Interrupt lower threshold, least significant bits 0x24 RW ALS_FILTER_CONFIG ALS Interrupt Filter Configuration 0x25 RW ALS_CONFIG ALS Integration time configuration 0x26 RW ALS_INTERVAL ALS Interval time configuration 0x27 RW ALS_CONTROL ALS Operation mode control 0x40 R INTERRUPT 0x41 R PS_DATA_MSB PS measurement data, most significant bits 0x42 R PS_DATA_LSB PS measurement data, least significant bits 0x43 R ALS1_DATA_MSB ALS1 measurement data, most significant bits 0x44 R ALS1_DATA_LSB ALS1 measurement data, least significant bits 0x45 R ALS2_DATA_MSB ALS2 measurement data, most significant bits 0x46 R ALS2_DATA_LSB ALS2 measurement data, least significant bits PS Interrupt Filter configuration PS Integration time configuration Interrupt status www.onsemi.com 13 NOA3315W PART_ID Register (0x00) The PART_ID register provides part and revision identification. These values are hard−wired at the factory and cannot be modified. Table 8. PART_ID Register (0x00) Bit 7 6 Field 5 4 3 2 Part number ID Field Bit Default Part number ID 7:4 1011 Revision ID 3:0 NA 1 0 Revision ID Description Part number identification Silicon revision number RESET Register (0x01) Software reset is controlled by this register. Setting this register followed by an I2C_STOP sequence will immediately reset the NOA3315W to the default startup standby state. Triggering the software reset has virtually the same effect as cycling the power supply tripping the internal Power on Reset (POR) circuitry. Table 9. RESET Register (0x01) Bit 7 6 5 4 Field 3 2 1 NA Field NA SW_reset Bit Default 7:1 XXXXXXX 0 0 0 SW_reset Description Don’t care Software reset to startup state INT_CONFIG Register (0x02) INT_CONFIG register controls the external interrupt pin function. Table 10. INT_CONFIG Register (0x02) Bit 7 6 5 Field Field NA Edge_triggered auto_clear polarity 4 3 NA Bit Default 7:3 XXXXX 2 0 1 0 1 0 2 1 0 edge_triggered auto_clear polarity Description Don’t care 0 Interrupt pin stays asserted while the INTERRUPT register bit is set (level) 1 Interrupt pin pulses at the end of each measurement while the INTERRUPT register bit is set 0 When an interrupt is triggered, the interrupt pin remains asserted until cleared by an I2C read of INTERRUPT register 1 Interrupt pin state is updated after each measurement 0 Interrupt pin active low when asserted 1 Interrupt pin active high when asserted PS_LED_FREQUENCY Register (0x0D) The LED FREQUENCY register controls the frequency of the LED pulses. The LED modulation frequency is determined by dividing 4 MHz by the register value. Valid divisors are 2−31. The default value is 16 which results in an LED pulse frequency of 250 KHz (one pulse every 4 ms). www.onsemi.com 14 NOA3315W Table 11. PS_LED_FREQUENCY Register (0x0D) Bit 7 6 Field 5 4 3 NA Field Bit Default NA 7:5 XXX LED_Frequency 4:0 10000 2 1 0 LED_Modulation Frequency Description Don’t care Defines the divider of the 4MHz clock to generate the LED pulses. Valid values are 2−31. PS_SAMPLE_DELAY Register (0x0E) The PS_SAMPLE_DELAY register controls the time delay after an LED pulse edge before the resulting signal is sampled by the proximity sensor. This can be used to reduce the effect of noise caused by the LED current switching. There is no delay for programmed values of 0x00 or 0x001. For other values the delay is (N−1)*125ns, where N is the decimal value of the register. Default value is 0x05 (500ns). N must be less than or equal to the value in register 0x0D (PS_LED_FREQUENCY). See the Description of Operation section for more information on programming this register. Table 12. PS_SAMPLE_DELAY Register (0x0E) Bit 7 6 Field 5 4 3 NA Field 2 1 0 PS_Sample_Delay Bit Default NA 7:5 XXX Sample Delay 4:0 00101 Description Don’t care Defines the delay from the LED pulse edge before the pulse is sampled. PS_LED_CURRENT Register (0x0F) The LED_CURRENT register controls how much current the internal LED driver sinks through the IR LED during modulated illumination. The current sink range is 5 mA plus a binary weighted value of the LED_Current register times 5 mA, for an effective range of 10 mA to 160 mA in steps of 5 mA. The default setting is 50 mA. A register setting of 00 turns off the LED Driver. Table 13. PS_LED_CURRENT Register (0x0F) Bit 7 6 Field Field 5 4 3 NA Bit Default NA 7:5 XXX LED_Current 4:0 01001 2 1 0 LED_Current Description Don’t care Defines current sink during LED modulation. Binary weighted value times 5 mA plus 5 mA. PS_TH Registers (0x10 – 0x13) threshold hysteresis value where the interrupt would be cleared. Setting the PS_hyst_trig low reverses the function such that the PS_TH_LO register sets the lower threshold at which an interrupt will be set and the PS_TH_UP represents the hysteresis value at which the interrupt would be subsequently cleared. Hysteresis functions only apply in “auto_clear” INT_CONFIG mode. The controller software must ensure the settings for LED current, sensitivity range, and integration time (LED pulses) are appropriate for selected thresholds. Setting thresholds to extremes (default) effectively disables interrupts. With hysteresis not enabled (see PS_CONFIG register), the PS_TH registers set the upper and lower interrupt thresholds of the proximity detection window. Interrupt functions compare these threshold values to data from the PS_DATA registers. Measured PS_DATA values outside this window will set an interrupt according to the INT_CONFIG register settings. With hysteresis enabled, threshold settings take on a different meaning. If PS_hyst_trig is set, the PS_TH_UP register sets the upper threshold at which an interrupt will be set, while the PS_TH_LO register then sets the lower www.onsemi.com 15 NOA3315W Table 14. PS_TH_UP Registers (0x10 – 0x11) Bit 7 6 5 Field 4 3 2 1 0 1 0 PS_TH_UP_MSB(0x10), PS_TH_UP_LSB(0x11) Field Bit Default Description PS_TH_UP_MSB 7:0 0xFF Upper threshold for proximity detection, MSB PS_TH_UP_LSB 7:0 0xFF Upper threshold for proximity detection, LSB Table 15. PS_TH_LO Registers (0x12 – 0x13) Bit 7 6 5 Field 4 3 2 PS_TH_LO_MSB(0x12), PS_TH_LO_LSB(0x13) Bit Default PS_TH_LO_MSB Field 7:0 0x00 Lower threshold for proximity detection, MSB Description PS_TH_LO_LSB 7:0 0x00 Lower threshold for proximity detection, LSB PS_FILTER_CONFIG Register (0x14) to set an interrupt. The default setting of 1 out of 1 effectively turns the filter off and any single measurement exceeding thresholds can trigger an interrupt. N must be greater than or equal to M. A setting of 0 for either M or N is not allowed and disables the PS Interrupt. PS_FILTER_CONFIG register provides a hardware mechanism to filter out single event occurrences or similar anomalies from causing unwanted interrupts. Two 4 bit registers (M and N) can be set with values such that M out of N measurements must exceed threshold settings in order Table 16. PS_FILTER_CONFIG Register (0x14) Bit 7 6 Field 5 4 3 2 filter_N Field 1 0 filter_M Bit Default Description filter_N 7:4 0001 Filter N filter_M 3:0 0001 Filter M PS_CONFIG Register (0x15) Proximity measurement sensitivity is controlled by specifying the integration time. The integration time sets the number of LED pulses during the modulated illumination. The LED modulation frequency remains constant with a period of 1.5 ms. Changing the integration time affects the sensitivity of the detector and directly affects the power consumed by the LED. The default is 1200 ms integration period. Hyst_enable and hyst_trigger work with the PS_TH (threshold) settings to provide jitter control of the INT function. ALS_blanking disables the ALS during the time the IR LED is on during a PS measurement. This will eliminate the effect of the PS IR signal bouncing off cover glass and affecting the ALS value. www.onsemi.com 16 NOA3315W Table 17. PS_CONFIG Register (0x15) Bit 7 Field 6 NA Field 5 4 3 hyst_enable hyst_trigger als_blanking Bit Default 7:6 XX hyst_enable 5 0 hyst_trigger 4 0 NA als_blanking 3 integration_time 1 0 integration_time Description Don’t Care 1 2:0 2 011 0 Disables hysteresis 1 Enables hysteresis 0 Lower threshold with hysteresis 1 Upper threshold with hysteresis 0 Disables ALS blanking 1 Enables ALS blanking 000 150 ms integration time 001 300 ms integration time 010 600 ms integration time 011 1200 ms integration time 100 1800 ms integration time 101 2400 ms integration time 110 3600 ms integration time 111 4800 ms integration time PS_INTERVAL Register (0x16) The PS_INTERVAL register sets the wait time between consecutive proximity measurements in PS_Repeat mode. The register is binary weighted times 10 in milliseconds plus 10ms. The range is therefore 10 ms to 1.28 s. The default startup value is 0x04 (50 ms). Table 18. PS_INTERVAL Register (0x16) Bit 7 Field NA Field NA Interval 6 5 4 3 2 1 0 interval Bit Default 7 0 6:0 0x04 Description 0x00 to 0x7F Interval time between measurement cycles. Binary weighted value times 10 ms plus a 10 ms offset. PS_CONTROL Register (0x17) The PS_CONTROL register is used to control the functional mode and commencement of proximity sensor measurements. The proximity sensor can be operated in either a single shot mode or consecutive measurements taken at programmable intervals. Both single shot and repeat modes consume a minimum of power by immediately turning off LED driver and sensor circuitry after each measurement. In both cases the quiescent current is less than the IDDSTBY parameter. These automatic power management features eliminate the need for power down pins or special power down instructions. www.onsemi.com 17 NOA3315W Table 19. PS_CONTROL Register (0x17) Bit 7 6 5 4 Field 3 2 NA Field 1 0 PS_Repeat PS_OneShot Bit Default 7:2 XXXXXX PS_Repeat 1 0 Initiates new measurements at PS_Interval rates PS_OneShot 0 0 Triggers proximity sensing measurement. In single shot mode this bit clears itself after cycle completion. NA Description Don’t care ALS_TH Registers (0x20 – 0x23) ALS_TH_UP register sets the upper threshold at which an interrupt will be set, while the ALS_TH_LO register then sets the lower threshold hysteresis value where the interrupt would be cleared. Setting the ALS_hyst_trig low reverses the function such that the ALS_TH_LO register sets the lower threshold at which an interrupt will be set and the ALS_TH_UP represents the hysteresis value at which the interrupt would be subsequently cleared. Hysteresis functions only apply in “auto_clear” INT_CONFIG mode. With hysteresis not enabled (see ALS_CONFIG register), the ALS_TH registers set the upper and lower interrupt thresholds of the ambient light detection window. Interrupt functions compare these threshold values to data from the ALS_DATA1 registers. Measured ALS_DATA1 values outside this window will set an interrupt according to the INT_CONFIG register settings. With hysteresis enabled, threshold settings take on a different meaning. If the ALS_hyst_trig is set, the Table 20. ALS_TH_UP Registers (0x20 – 0x21) Bit 7 6 5 Field 4 3 2 1 0 1 0 ALS_TH_UP_MSB(0x20), ALS_TH_UP_LSB(0x21) Field Bit Default Description ALS_TH_UP_MSB 7:0 0xFF Upper threshold for ALS detection, MSB ALS_TH_UP_LSB 7:0 0xFF Upper threshold for ALS detection, LSB Table 21. ALS_TH_LO Registers (0x22 – 0x23) Bit 7 6 5 Field 4 3 2 ALS_TH_LO_MSB(0x22), ALS_TH_LO_LSB(0x23) Field Bit Default Description ALS_TH_LO_MSB 7:0 0x00 Lower threshold for ALS detection, MSB ALS_TH_LO_LSB 7:0 0x00 Lower threshold for ALS detection, LSB ALS_FILTER_CONFIG Register (0x24) to set an interrupt. The default setting of 1 out of 1 effectively turns the filter off and any single measurement exceeding thresholds can trigger an interrupt. N must be greater than or equal to M. A setting of 0 for either M or N is not allowed and disables the ALS Interrupt. ALS_FILTER_CONFIG register provides a hardware mechanism to filter out single event occurrences or similar anomalies from causing unwanted interrupts. Two 4 bit registers (M and N) can be set with values such that M out of N measurements must exceed threshold settings in order Table 22. ALS_FILTER_CONFIG Register (0x24) Bit 7 6 Field 5 4 3 2 filter_N Field 1 filter_M Bit Default Description filter_N 7:4 0001 Filter N filter_M 3:0 0001 Filter M www.onsemi.com 18 0 NOA3315W ALS_CONFIG Register (0x25) Range settings control the ALS sensitivity. The default setting (00) is the maximum sensitivity at 100 counts per lux. Bit 3 simply performs a logical divide by 10 of the ALS counts which allows for a 1 count per lux range. Note that 10 counts per lux can be obtained either by 01 – which is an analog range change, or by 10 which is the 100 count per lux range divided by 10. The “counts per lux” is based on the default integration time of 50 ms. The ALS_CONFIG register controls the operation of the ambient light sensors. Als2_enable and als1_enable allow the desired sensors to be used while powering off unused sensors. Hyst_enable and hyst_trigger work with the ALS_TH (threshold) settings to provide jitter control of the INT function. The ambient light measurement sensitivity is controlled by specifying the integration time. For backwards compatibility, if both als1_enable and als2_enable are zero, ALS1 is enabled. If no ALS measurements are desired, do not issue an ALS start command (register 0x27). Table 23. ALS_CONFIG Register (0x25) Bit 7 6 5 4 Field als2_enable als1_enable hyst_enable hyst_trigger Field als2_enable Bit Default 7 0 als1_enable 6 1 hyst_enable 5 0 hyst_trigger 4 range integration_time 00 1:0 2 range 1 0 integration_time Description 0 3:2 3 00 0 Disables ALS2 (unfiltered ALS) 1 Enables ALS2 0 Disables ALS1 (ALS with photopic filter) 1 Enables ALS1 0 Disables hysteresis 1 Enables hysteresis 0 Lower threshold with hysteresis 1 Upper threshold with hysteresis 00 100 counts per lux 01 10 counts per lux 10 10 counts per lux (method 2) 11 1 count per lux 00 50 ms integration time 01 100 ms integration time 10 200 ms integration time 11 400 ms integration time ALS_INTERVAL Register (0x26) The ALS_INTERVAL register sets the interval between consecutive ALS measurements in ALS_Repeat mode. The register is binary weighted times 50 in milliseconds. The range is 0 ms to 3.15 s. The register value 0x00 and 0 ms translates into a continuous loop measurement mode at any integration time. The default startup value is 0x0A (500 ms). The als_power bit is used to keep the ALS powered up at a low current (~10 mA) for use in low light environments (for instance with 1% transmission glass). It is not needed if the ALS is run in repeat mode or single shot mode at least every 500 ms. The default is 0, which does not keep the ALS powered up. Table 24. ALS_INTERVAL Register (0x26) Bit 7 6 Field NA als_power Field als_power interval 5 4 3 2 interval Bit Default 6 0 5:0 0x0A Description Keeps ALS powered up Interval time between ALS measurement cycles www.onsemi.com 19 1 0 NOA3315W ALS_CONTROL Register (0x27) than the IDDSTBY parameter. These automatic power management features eliminate the need for power down pins or special power down instructions. For accurate measurements at low light levels (below approximately 3 lux) ALS readings must be taken at least once per second and the first measurement after a reset (software reset or power cycling) should be ignored. The ALS_CONTROL register is used to control the functional mode and commencement of ambient light sensor measurements. The ambient light sensor can be operated in either a single shot mode or consecutive measurements taken at programmable intervals. Both single shot and repeat modes consume a minimum of power by immediately turning off sensor circuitry after each measurement. In both cases the quiescent current is less Table 25. ALS_CONTROL Register (0x27) Bit 7 6 5 4 Field 3 2 NA Field 1 0 ALS_Repeat ALS_OneShot Bit Default 7:2 XXXXXX ALS_Repeat 1 0 Initiates new measurements at ALS_Interval rates ALS_OneShot 0 0 Triggers ALS sensing measurement. In single shot mode this bit clears itself after cycle completion. NA Description Don’t care INTERRUPT Register (0x40) The INTERRUPT register displays the status of the interrupt pin and if an interrupt was caused by the proximity or ambient light sensor. If “auto_clear” is disabled (see INT_CONFIG register), reading this register also will clear the interrupt. Table 26. INTERRUPT Register (0x40) Bit 7 6 Field 5 NA Field 4 3 2 1 0 INT ALS_intH ALS_intL PS_intH PS_intL Bit Default Description NA 7:5 XXX INT 4 0 Status of external interrupt pin (1 is asserted) ALS_intH 3 0 Interrupt caused by ALS exceeding maximum ALS_intL 2 0 Interrupt caused by ALS falling below the minimum PS_intH 1 0 Interrupt caused by PS exceeding maximum PS_intL 0 0 Interrupt caused by PS falling below the minimum Don’t care PS_DATA Registers (0x41 – 0x42) The PS_DATA registers store results from completed proximity measurements. When an I2C read operation begins, the current PS_DATA registers are locked until the operation is complete (I2C_STOP received) to prevent possible data corruption from a concurrent measurement cycle. Table 27. PS_DATA Registers (0x41 – 0x42) Bit 7 6 5 Field 4 3 2 PS_DATA_MSB(0x41), PS_DATA_LSB(0x42) Field Bit Default PS_DATA_MSB 7:0 0x00 Proximity measurement data, MSB Description PS_DATA_LSB 7:0 0x00 Proximity measurement data, LSB www.onsemi.com 20 1 0 NOA3315W ALS1_DATA Registers (0x43 – 0x44) The ALS1_DATA registers store results from completed ALS1 measurements. When an I2C read operation begins, the current ALS1_DATA registers are locked until the operation is complete (I2C_STOP received) to prevent possible data corruption from a concurrent measurement cycle. Table 28. ALS1_DATA Registers (0x43 – 0x44) Bit 7 6 5 Field 4 3 2 1 0 ALS1_DATA_MSB(0x43), ALS1_DATA_LSB(0x44) Field Bit Default Description ALS1_DATA_MSB 7:0 0x00 ALS1 measurement data, MSB ALS1_DATA_LSB 7:0 0x00 ALS1 measurement data, LSB ALS2_DATA Registers (0x45 – 0x46) The ALS2_DATA registers store results from completed ALS2 measurements. When an I2C read operation begins, the current ALS2_DATA registers are locked until the operation is complete (I2C_STOP received) to prevent possible data corruption from a concurrent measurement cycle. Table 29. ALS2_DATA REGISTERS (0x45 – 0x46) Bit 7 6 5 Field 4 3 2 ALS2_DATA_MSB(0x45), ALS2_DATA_LSB(0x46) Field Bit Default Description ALS2_DATA_MSB 7:0 0x00 ALS2 measurement data, MSB ALS2_DATA_LSB 7:0 0x00 ALS2 measurement data, LSB www.onsemi.com 21 1 0 NOA3315W Proximity Sensor Operation Sending an I2C_STOP sequence at the end of the write signals the internal state machines to wake up and begin the next measurement cycle. Figure 25 and Figure 26 illustrate the activity of key signals during a proximity sensor measurement cycle. The cycle begins by starting the precision oscillator and powering up the proximity sensor receiver. Next, the IR LED current is modulated according to the LED current setting at the chosen LED frequency and the values during both the on and off times of the LED are stored (illuminated and ambient values). Finally, the proximity reading is calculated by subtracting the ambient value from the illuminated value and storing the result in the 16 bit PS_Data register. In One−shot mode, the PS receiver is then powered down and the oscillator is stopped (unless there is an active ALS measurement). If Repeat mode is set, the PS receiver is powered down for the specified interval and the process is repeated. With default configuration values (receiver integration time = 1200 ms), the total measurement cycle will be less than 2 ms. NOA3315W operation is divided into three phases: power up, configuration and operation. On power up the device initiates a reset which initializes the configuration registers to their default values and puts the device in the standby state. At any time, the host system may initiate a software reset by writing 0x01 to register 0x01. A software reset performs the same function as a power−on−reset. The configuration phase may be skipped if the default register values are acceptable, but typically it is desirable to change some or all of the configuration register values. Configuration is accomplished by writing the desired configuration values to registers 0x02 through 0x17. Writing to configuration registers can be done with either individual I2C byte−write commands or with one or more I2C block write commands. Block write commands specify the first register address and then write multiple bytes of data in sequence. The NOA3315W automatically increments the register address as it acknowledges each byte transfer. Proximity sensor measurement is initiated by writing appropriate values to the CONTROL register (0x17). I2C Stop 50 − 200μs PS Power 9μs 0 − 100μs 4MHz Osc On ~600μs LED Burst 8 clks 12μs Integration Time Integration 100 − 150μs Data Available Figure 25. Proximity Sensor One−Shot Timing (Repeat) Interval I2C Stop PS Power 50 − 200μs 9μs 0 − 100μs 4MHz Osc On LED Burst ~600μs 8 clks 12μs Integration Time Integration 100 − 150μs Data Available Figure 26. Proximity Sensor Repeat Timing www.onsemi.com 22 NOA3315W Ambient Light Sensor Operation ALS measurement is initiated by writing appropriate values to the CONTROL register (0x27). Sending an I2C_STOP sequence at the end of the write signals the internal state machines to wake up and begin the next measurement cycle. Figure 27 and Figure 28 illustrate the activity of key signals during an ambient light sensor measurement cycle. The cycle begins by starting the calibrated low frequency (LF) oscillator and powering up the ambient light sensor. Next, the ambient light measurement is made for the specified integration time and the result is stored in the appropriate 16 bit ALS Data registers. If in One−shot mode, the ALS is powered down and awaits the next command. If in Repeat mode the ALS is powered down, the interval is timed out and the operation repeated. There are some special cases if the interval timer is set to less than the integration time. For continuous mode, the interval is set to either 0 or a value less than or equal to the integration time and the ALS makes continuous measurements with only a 5 ms delay between integration times and the ALS remains powered up. The NOA3315W supports dual ambient light sensors. ALS1 has a photopic filter which closely mimics the spectral response of the human eye. ALS2 has no filters. In many respects ALS1 and ALS2 are similar, but each sensor can be separately enabled or disabled and each ALS has its own data registers. ALS1 and ALS2 share control, configuration and operational details except that ALS2 is not compared to the threshold registers and cannot create an interrupt. ALS1 and ALS2 support simultaneous concurrent measurements allowing the two sensor values to be read out and used in computations as desired. ALS configuration is accomplished by writing the desired configuration values to registers 0x02 and 0x20 through 0x27. Writing to configuration registers can be done with either individual I2C byte−write commands or with one or more I2C block write commands. Block write commands specify the first register address and then write multiple bytes of data in sequence. The NOA3315W automatically increments the register address as it acknowledges each byte transfer. I2C Stop 150 − 200μs ALS Power 5μs 50 − 100μs LF OscOn 10ms Integration Integration Time 100 − 150μs Data Available Figure 27. ALS One−Shot Timing Interval (Repeat) I2C Stop ALS Power 0 − 25ms 5μs 50 − 100μs LF Osc On Integration 10ms Integration Time 100 − 150μs Data Available NOTE: If Interval is set to 0 (continuous) the time between integrations is 5 ms and power stays on. If Interval is set to ≤ to the integration time (but not 0) the time between integrations is 10 ms and power stays on. If Interval is set to > integration time the time between integrations is the interval and the ALS powers down. Figure 28. ALS Repeat Timing www.onsemi.com 23 NOA3315W Example Programming Sequence The following pseudo code configures the NOA3315W proximity sensor in repeat mode with 50 ms wait time between each measurement and then runs it in an interrupt driven mode. When the controller receives an interrupt, the interrupt determines if the interrupts was caused by the proximity sensor and if so, reads the PS_Data from the device, sets a flag and then waits for the main polling loop to respond to the proximity change. external subroutine I2C_Read_Byte (I2C_Address, Data_Address); external subroutine I2C_Read_Block (I2C_Address, Data_Start_Address, Count, Memory_Map); external subroutine I2C_Write_Byte (I2C_Address, Data_Address, Data); external subroutine I2C_Write_Block (I2C_Address, Data_Start_Address, Count, Memory_Map); subroutine Initialize_PS () { MemBuf[0x02] = 0x02; // INT_CONFIG assert interrupt until cleared MemBuf[0x0F] = 0x09; // PS_LED_CURRENT 50mA MemBuf[0x10] = 0x8F; // PS_TH_UP_MSB MemBuf[0x11] = 0xFF; // PS_TH_UP_LSB MemBuf[0x12] = 0x70; // PS_TH_LO_MSB MemBuf[0x13] = 0x00; // PS_TH_LO_LSB MemBuf[0x14] = 0x11; // PS_FILTER_CONFIG turn off filtering MemBuf[0x15] = 0x09; // PS_CONFIG ALS blanking enabled, 300us integration time MemBuf[0x16] = 0x0A; // PS_INTERVAL 50ms wait MemBuf[0x17] = 0x02; // PS_CONTROL enable continuous PS measurements MemBuf[0x20] = 0xFF; // ALS_TH_UP_MSB MemBuf[0x21] = 0xFF; // ALS_TH_UP_LSB MemBuf[0x22] = 0x00; // ALS_TH_LO_MSB MemBuf[0x23] = 0x00; // ALS_TH_LO_LSB MemBuf[0x25] = 0x40; // ALS_CONFIG ALS2 disabled, ALS1 enabled, max sensitivity, 50ms integration time MemBuf[0x26] = 0x00; // ALS_INTERVAL continuous measurement mode MemBuf[0x27] = 0x02; // ALS_CONTROL enable continuous ALS measurements I2C_Write_Block (I2CAddr, 0x02, 37, MemBuf); } subroutine I2C_Interupt_Handler () { // Verify this is a PS interrupt INT = I2C_Read_Byte (I2CAddr, 0x40); if (INT == 0x11 || INT == 0x12) { // Retrieve and store the PS data PS_Data_MSB = I2C_Read_Byte (I2CAddr, 0x41); PS_Data_LSB = I2C_Read_Byte (I2CAddr, 0x42); NewPS = 0x01; } } subroutine main_loop () { I2CAddr = 0x37; NewPS = 0x00; Initialize_PS (); loop { // Do some other polling operations if (NewPS == 0x01) { NewPS = 0x00; // Do some operations with PS_Data } } } www.onsemi.com 24 NOA3315W Physical Location of Photodiode Sensors The physical locations of the NOA3315W proximity sensor and ambient light sensor photodiodes are shown in Figure 29, referenced to the lower left hand corner of the die. 60 um LED VDD LED GND VSS 60 um LED VDD VSS Scribe Line SCL INT SDA SCL INT Scribe Line 1540 um 581.8 um 416.8 um ALS2 PS ALS1 840 um 517 um 416.9 um LED INT VDD 441.9 um LED GND VSS SCL LED SDA VDD VSS SCL INT Figure 29. Photodiode Locations Table 30. BONDING PAD LOCATIONS (Dimensions in mm measured from the lower left corner of the die to the middle of the bond pad) (Note 9) Pad Description X Y Pad Size 139 58.4 75x75 VDD Power supply VSS Ground 248.5 58.4 75x75 Ground for IR LED driver 895.5 54.5 75x75 LED IR LED output 1483.5 65.6 75x75 INT Interrupt output 1467.3 786 75x75 SDA I2C data signal 554.9 786 75x75 SCL I2C clock signal 114.25 786 75x75 LED_GND 9. Bond pad material is AL + 0.5% Cu Table 31. MECHANICAL DIMENSIONS Parameter Symbol Wafer thickness Min Typ Max Unit 700 725 750 mm Wafer diameter 200 www.onsemi.com 25 mm NOA3315W ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. 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