Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPhotoelectric SensorsPhoto sensor 1 pc(s) 1.7 - 3.6 Vdc (L x W x H) 2 x 2 x 0.6 mm

AVAILABLE

EVALUATION KIT AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

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Industry’s Lowest-Power

Ambient Light Sensor with ADC

19-5719; Rev 0; 1/11

General Description

The MAX44009 ambient light sensor features an I

digital output that is ideal for a number of portable appli-

cations such as smartphones, notebooks, and industrial

sensors. At less than 1µA operating current, it is the

lowest power ambient light sensor in the industry and

features an ultra-wide 22-bit dynamic range from 0.045

lux to 188,000 lux.

Low-light operation allows easy operation in dark-glass

applications.

The on-chip photodiode’s spectral response is optimized

to mimic the human eye’s perception of ambient light

and incorporates IR and UV blocking capability. The

adaptive gain block automatically selects the correct lux

range to optimize the counts/lux.

The IC is designed to operate from a 1.7V to 3.6V sup-

ply voltage range and consumes only 0.65µA in full

operation. It is available in a small, 2mm x 2mm x 0.6mm

UTDFN-Opto package.

Applications

Tablet PCs/Notebook Computers

TVs/Projectors/Displays

Digital Lighting Management

Portable Devices

Cellular Phones/Smartphones

Security Systems

Features

S Wide 0.045 Lux to 188,000 Lux Range

Small, 2mm x 2mm x 0.6mm UTDFN-Opto

= 1.7V to 3.6V

= 0.65µA Operating Current

-40 NC to +85NC Temperature Range

Device Address Options

1001 010x and 1001 011x

Ordering Information

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

Block Diagram

PART PIN-PACKAGE TEMP RANGE

MAX44009EDT+ 6 UTDFN-Opto-EP*

-40NC to +85NC

DIGITAL

SIGNAL

PROCESSING

6-BIT RANGE

CDR, TIM

CONTROL

VISIBLE +IR

PHOTODIODE

MAX44009

GND

SCL

SDA

INT

16-BIT

ADC

16-BIT

ADC

MAX44009

Summary of content (20 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX44009 LE AVAILAB Industry’s Lowest-Power Ambient Light Sensor with ADC General Description Features The MAX44009 ambient light sensor features an I2C S Wide 0.045 Lux to 188,000 Lux Range digital output that is ideal for a number of portable applications such as smartphones, notebooks, and industrial sensors. At less than 1µA operating current, it is the lowest power ambient light sensor in the industry and features an ultra-wide 22-bit dynamic range from 0.
PAGE 2
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC ABSOLUTE MAXIMUM RATINGS Continuous Input Current into Any Terminal.................... Q20mA Continuous Power Dissipation 6 UTDFN-Opto (derate 11.9mW/NC above +70NC)......953mW Operating Temperature Range........................... -40NC to +85NC INT to GND................................................ -0.3V to (VCC + 0.3V) All Other Pins to GND..............................................-0.3V to +4V INT Short-Circuit Current Duration.....
PAGE 3
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC ELECTRICAL CHARACTERISTICS (continued) (VCC = 1.8V, TMIN to TMAX = -40NC to +85NC, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 400 kHz I2C TIMING Serial-Clock Frequency fSCL Bus Free Time Between a STOP and a START Condition tBUF 1.3 Fs tHD,STA 0.6 Fs Low Period of the SCL Clock tLOW 1.3 Fs High Period of the SCL Clock tHIGH 0.
PAGE 4
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC Typical Operating Characteristics (VCC = 1.8V, default power-up setting, unless otherwise noted.) RADIATION PATTERN SPECTRUM RESPONSE 80 60 40 CIE 20 MAX44009 toc02 MAX44009 RESPONSE 90 80 70 60 50 40 30 AUTO MODE, INCANDESCENT LAMP 20 10 0 0 400 500 600 700 800 900 -90 1000 -60 -30 SPECTRUM OF LIGHT SOURCES FOR MEASUREMENT MAX44009 toc03 120 SUNLIGHT 80 60 40 FLUORESCENT 1.0 400 500 600 700 800 WAVELENGTH (nm) 0.8 0.
PAGE 5
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC Typical Operating Characteristics (continued) (VCC = 1.8V, default power-up setting; unless otherwise noted.) SUPPLY CURRENT vs. LUX READING 2.0 1.5 1.0 200 INCANDESCENT LAMP 150 100 50 0.5 SUNLIGHT 0 0 100 1k 10k 100k 0 LUX READING (LUX) 50 100 150 200 250 300 120 110 100 90 80 70 60 50 40 30 20 10 0 REFERENCE METER READING (LUX) MAX44009 toc09 MAX44009 toc08 250 VOL (mV) 2.
PAGE 6
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC Detailed Description The default integration time of the ADC is 100ms, giving it inherent rejection of 50Hz and 60Hz ripple common in certain line-powered light sources. The MAX44009 is an ambient light sensor with integrated photodiode and ADC with an I2C digital interface. To measure ambient light, the die is placed inside an optically transparent (UTDFN-Opto) package.
PAGE 7
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC Register and Bit Descriptions Table 1.
PAGE 8
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC Interrupt events set the INTS bit (register 0x00, bit 0) and the INT pin only if the INTE bit is set to 1. If the INTE bit is set (interrupt is enabled) and the interrupt condition is triggered, then the INT pin is pulled low (asserted) and the INTS bit in the Interrupt Status register is set to 1. See Table 3. Table 3.
PAGE 9
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC Integration Timer Bits (TIM[2:0]) The TIM[2:0] bits can be used to program the signal integration time. In automatic mode (MANUAL = 0), integration time is automatically selected by the on-chip algorithm to be either 100ms/200ms/400ms/800ms. In manual mode, integration time can be varied by the user all the way from 6.25ms to 800ms. See Table 7. Table 7.
PAGE 10
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC Lux Low-Byte Register 0x04 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 REGISTER ADDRESS — — — — M3 M2 M1 M0 0x04 Bits in Lux Low-Byte register 0x04 give the 4 least significant bits of the mantissa byte representing the lux reading of ambient light. Combined with the Lux High-Byte register 0x03, it extends the resolution and dynamic range of lux measurements of the IC.
PAGE 11
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC Lower Threshold High-Byte Register 0x06 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 REGISTER ADDRESS LE3 LE2 LE1 LE0 LM7 LM6 LM5 LM4 0x06 The Lower Threshold High-Byte register exponent with the four most significant bits of the mantissa sets the lower trip level for interrupt functionality. This lower limit is relevant only if the INTE bit in the Interrupt Enable register is set.
PAGE 12
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC The mantissa is an 8-bit number ranging from 0000 0000 to 1111 0000 (zero to 240). The count is multiplied by 0.045, which is the LSB. Because of the logarithmic nature of autoranging circuitry implemented on the IC, resolution of ambient lux readings scale with the absolute measurement. Table 8 lists the lux resolution and the lux ranges obtained from the IC. Upper lux threshold = (2(exponent) x mantissa) x 0.
PAGE 13
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC Table 9. Recommended Manual Mode Settings for Configuration Register (0x02) and Threshold Registers (0x05, 0x06) RECOMMENDED SETTINGS FOR CONFIGURATION REGISTER (0x03) APPLICATION CONDITIONS RANGE OF EXPONENTS FOR UPPER AND LOWER REGISTERS (0x05 AND 0x06) LUX LSB (MIN) LUX (MAX) LUX LSB (MAX) INTEGRATION TIME (ms) TIM CDR EXPONENT (MIN) EXPONENT (MAX) 0.045 2938 11.52 800 000 0 0000 1000 0.09 5875 23.
PAGE 14
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC START READ MAX44009 AMBIENT LUX, SET APPROPRIATE BACKLIGHT STRENGTH WRITE TO UPPER LUX THRESHOLD, LOWER LUX THRESHOLD, AND LUX THRESHOLD TIMER REGISTERS WORK ON TASKS/SLEEP UNTIL WOKEN BY HARDWARE INTERRUPT WOKEN BY INTERRUPT? N Y CHECK OTHER INTERRUPT SOURCES READ INTS BIT TO CONFIRM Y MAX44009 CAUSED INTERRUPT? N Figure 2.
PAGE 15
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC I2C Serial Interface The IC features an I2C/SMBus™-compatible, 2-wire serial interface consisting of a serial-data line (SDA) and a serial-clock line (SCL). SDA and SCL facilitate communication between the IC and the master at clock rates up to 400kHz. Figure 3 shows the 2-wire interface timing diagram. The master generates SCL and initiates data transfer on the bus.
PAGE 16
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC S SR P CLOCK PULSE FOR ACKNOWLEDGMENT START CONDITION SCL SCL 1 2 8 9 NOT ACKNOWLEDGE SDA SDA ACKNOWLEDGE Figure 4. START, STOP, and Repeated START Conditions Slave Address The slave address with the R/W bit set to 0 indicates that the master intends to write data to the IC. The IC acknowledges receipt of the address byte during the master-generated ninth SCL pulse.
PAGE 17
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC ACKNOWLEDGE FROM MAX44009 B7 ACKNOWLEDGE FROM MAX44009 SLAVE ADDRESS S 0 B6 B5 B4 B3 B2 B1 B0 ACKNOWLEDGE FROM MAX44009 REGISTER ADDRESS A A DATA BYTE A R/W P 1 BYTE Figure 6.
PAGE 18
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC VCC 0.76mm 2mm 1 MAX44009 6 SDA 5 SCL 4 INT TOP VIEW AD 2 0.24mm CENTER OF MAX44009 0.13mm 0.88mm 0.12mm 0.25mm 0.87mm GND 3 2mm 0.75mm Figure 9. Sensor Position Typical Application Circuit VCC TO 3.6V 1.7V TO 3.6V 0V TO VCC 1µF 10kI 10kI 10kI VCC SDA SDA GND SCL SCL A0* INT INT MAX44009 *DEVICE ADDRESS IS 1001 010x. CONNECT A0 TO VCC FOR SLAVE ADDRESS 1001 011x. SEE THE PIN DESCRIPTION.
PAGE 19
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 20
MAX44009 Industry’s Lowest-Power Ambient Light Sensor with ADC Revision History REVISION NUMBER REVISION DATE 0 1/11 DESCRIPTION Initial release PAGES CHANGED — Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.