Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPhotoelectric Sensors1 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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For pricing, delivery, and

ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

Ambient and Infrared Proximity Sensor

General Description

The MAX44000 combines a wide-dynamic range ambient

light sensor with an integrated infrared proximity sensor. The

IC is a perfect solution for touch-screen portable devices.

The IC can consume as low as 11µA (time averaged) in

ambient light sensing plus proximity sensing, including

external IR LED current.

The on-chip ambient sensor has the ability to make wide

dynamic range 0.03 lux to 65,535 lux measurements. An

on-chip IR proximity detector is matched with an inte-

grated IR LED driver. All readings are available on an

C communication bus. A programmable interrupt pin

minimizes the need to poll the device for data, freeing

up microcontroller resources, reducing system software

overhead, and ultimately, reducing power consumption.

The IC is designed to drive an external IR LED and can

operate from a V

of 1.7V to 3.6V. It consumes just 5µA

operating current when only the ambient light sensor is

enabled and 7µA when the proximity receiver and driver

are enabled.

Applications

Smartphones

Accessories

Industrial Sensors

Presence Detection

Features

S Tiny, 2mm x 2mm x 0.6mm UTDFN-Opto Package

= 1.7V to 3.6V

Low-Power Operation

5µA in Ambient Mode

7µA in Ambient Plus Proximity Mode

70µA in Ambient Plus Proximity Mode,

Including 100mA LED Current

S Excellent Light Source Matching

Programmable Green and IR Channel Gains

Integrated Single-Pulse IR LED Driver

10mA to 110mA Programmable Range

Internal Ambient Cancellation

-40NC to +105NC Temperature Range

19-5859; Rev 0; 10/11

Typical Application Circuit appears at end of data sheet.

Simplified Block Diagram

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

*EP = Exposed pad.

Ordering Information

14-/8-BIT

IR LED

DRV

VIS + IR

(ALS)

IR (ALS)

IR (PRX)

LED

14-BIT

ALS

PGA

AMBIENT

CANCELLATION

ALS

PGA

SDA

SCL

INT

MAX44000

GND

MICROCONTROLLER

GND

PRX

PGA

PART TEMP RANGE PIN-PACKAGE

MAX44000GDT+

-40NC to +105NC

6 OTDFN-EP*

MAX44000

Summary of content (24 pages)

PAGE 1
EVALUATION KIT AVAILABLE LE AVAILAB MAX44000 Ambient and Infrared Proximity Sensor General Description Features The MAX44000 combines a wide-dynamic range ambient light sensor with an integrated infrared proximity sensor. The IC is a perfect solution for touch-screen portable devices. S Tiny, 2mm x 2mm x 0.6mm UTDFN-Opto Package S VDD = 1.7V to 3.
PAGE 2
MAX44000 Ambient and Infrared Proximity Sensor ABSOLUTE MAXIMUM RATINGS Continuous Power Dissipation (TA = +70NC) 6-Pin OTDFN (derate 11.9mW/NC above +70NC)............. 953mW Operating Temperature Range......................... -40NC to +105NC Soldering Temperature (reflow).......................................+260NC All Pins to GND.....................................................-0.3V to +4.0V Output Short-Circuit Current Duration........................
PAGE 3
MAX44000 Ambient and Infrared Proximity Sensor ELECTRICAL CHARACTERISTICS (continued) (VDD = 1.8V, TMIN – TMAX = -40°C to +105°C, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS IR LED TRANSMITTER Minimum IR LED Drive Current Sink 10 mA Maximum IR LED Drive Current Sink 110 mA Current Control Step 10 Current Control Accuracy DRV Leakage Current Voltage Compliance of DRV Pin mA IOUT = 110mA, VDRV = 1.5V 12 IOUT = 50mA, VDRV = 1.
PAGE 4
MAX44000 Ambient and Infrared Proximity Sensor ELECTRICAL CHARACTERISTICS (continued) (VDD = 1.8V, TMIN – TMAX = -40°C to +105°C, TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 400 kHz I2C TIMING CHARACTERISTICS Serial-Clock Frequency fSCL Bus Free Time Between STOP and START tBUF 1.3 Fs Hold Time (Repeated) START Condition tHD,STA 0.6 Fs Low Period of the SCL Clock tLOW 1.3 Fs High Period of the SCL Clock tHIGH 0.
PAGE 5
MAX44000 Ambient and Infrared Proximity Sensor Typical Operating Characteristics (continued) (VDD = 1.8V, TMIN – TMAX = -40°C to +85°C, unless otherwise noted. All devices are 100% production tested at TA = +25°C. Temperature limits are guaranteed by design.) 1000 INCANDESCENT 800 100 600 50 400 200 BLACK GLASS REFLECTOR 0 0 100 200 300 400 500 600 700 800 900 1000 SUPPLY CURRENT vs. SUPPLY VOLTAGE vs.
PAGE 6
MAX44000 Ambient and Infrared Proximity Sensor Typical Operating Characteristics (continued) (VDD = 1.8V, TMIN – TMAX = -40°C to +85°C, unless otherwise noted. All devices are 100% production tested at TA = +25°C. Temperature limits are guaranteed by design.) SUPPLY CURRENT vs. LUX SUPPLY CURRENT vs.
PAGE 7
MAX44000 Ambient and Infrared Proximity Sensor Pin Configuration TOP VIEW + VDD 1 GND 2 DRV 3 MAX44000 EP* 6 SDA 5 SCL 4 INT *EP = EXPOSED PAD, CONNECT TO GND. Pin Description PIN NAME 1 VDD Power Supply FUNCTION 2 GND Ground 3 DRV IR LED Current Driver 4 Interrupt. Active-low output. 5 INT SCL 6 SDA I2C Data EP — I2C Clock Exposed Pad. EP is internally connected to GND. EP must be connected to GND.
PAGE 8
MAX44000 Ambient and Infrared Proximity Sensor The IC operates from a VDD of 1.7V to 3.6V and consumes just 5FA current in ALS mode and 7FA time-averaged in proximity mode. The on-chip IR proximity detector DC ambient rejection circuitry is synchronized with pulsing of an integrated IR LED transmitter to improve noise immunity from external fluctuating IR sources.
PAGE 9
MAX44000 Ambient and Infrared Proximity Sensor Proximity Light Sensing large amounts of DC IR radiation. Due to the use of a single-pulse technique in pulsing the external infrared LED, the chip is also immune to fixed-frequency external infrared radiation such as from remote controls, electronic ballasts, etc., leading to more reliable infrared proximity sensor operation. The proximity sensing uses an external, pulsed infrared LED source to emit controlled amounts of infrared radiation.
PAGE 10
MAX44000 Ambient and Infrared Proximity Sensor Register Description (continued) REGISTER B7 B6 B5 B4 Threshold Persist Timer B3 B2 B1 PRXPST[1:0] PROX Threshold Indicator B0 ALSPST[1:0] ABOVE PROX Threshold PRXTHR[7:0] Digital Gain Trim of Green Channel TRIM_ GREEN_ IR[0] TRIM_GAIN_GREEN[6:0] Digital Gain Trim of Infrared Channel TRIM_GAIN_IR[8:1] REGISTER ADDRESS POWER-ON RESET STATE R/W 0x0A 0x00 R/W 0x0B 0x00 R/W 0x0C 0x00 R/W 0x0F 0x80 R/W 0x10 0x80 R/W The individ
PAGE 11
MAX44000 Ambient and Infrared Proximity Sensor Proximity Interrupt Status (PRXINTS) BIT 1 OPERATION 0 No interrupt trigger event has occurred. 1 The IR proximity receive intensity has exceeded the threshold limit for greater than persist timer count PRXPST[1:0]. This bit also causes the INT pin to be pulled low. Once set, the only way to clear this bit is to read this register or to set PRXINTE bit to 0. Power-On Reset Status (PWRON) BIT 2 OPERATION 0 No interrupt trigger event has occurred.
PAGE 12
MAX44000 Ambient and Infrared Proximity Sensor Proximity Interrupt Enable (PRXINTE) BIT 1 OPERATION 0 The PRXINTS bit remains unasserted, and proximity channel readings are not compared with interrupt thresholds. 1 Detection of a proximity interrupt event triggers a hardware interrupt (INT pin is pulled low) and sets the PRXINTS bit (register 0x00, B1). Proximity channel readings are compared with proximity interrupt threshold settings and proximity persist timer.
PAGE 13
MAX44000 Ambient and Infrared Proximity Sensor Ambient ADC Conversion Time (ALSTIM) The 2-bit ALSTIM[1:0] sets the integration time for ALS ADC conversion, as shown in Table 1. Table 1. Ambient ADC Conversion Time ALSTIM[1:0] INTEGRATION TIME (ms) FULL-SCALE ADC COUNTS 00 100 16,384 14 1x 01 25 4096 12 4x 10 6.25 1024 10 16x 11 1.
PAGE 14
MAX44000 Ambient and Infrared Proximity Sensor ALS Data Register (0x04, 0x05) REGISTER B7 B6 ADC High Byte (ALS) B5 B4 OFL B3 B2 B1 B0 ALSDATA[13:8] ADC Low Byte (ALS) ALSDATA[7:0] REGISTER ADDRESS POWER-ON RESET STATE R/W 0x04 0x00 R 0x05 0x00 R The 2 bytes here (ALSDATA[13:0]) hold the results of the ALS signal conversion. The resolution and bit length of the result is controlled by the value of ALSTIM[1:0] and ALSPGA[1:0] bits.
PAGE 15
MAX44000 Ambient and Infrared Proximity Sensor ALS Interrupt Threshold Registers (0x06–0x09) REGISTER B7 B6 B5 B4 ALS Upper Threshold (High Byte) B3 B2 B1 B0 REGISTER ADDRESS POWER-ON RESET STATE R/W 0x06 0x00 R/W 0x07 0x00 R/W 0x08 0x00 R/W 0x09 0x00 R/W UPTHR[13:8] ALS Upper Threshold (Low Byte) UPTHR[7:0] ALS Lower Threshold (High Byte) LOTHR[13:8] ALS Lower Threshold (Low Byte) LOTHR[7:0] The ALS upper threshold and ALS lower threshold (UPTHR[13:0] and LOTHR[13:0]) set th
PAGE 16
MAX44000 Ambient and Infrared Proximity Sensor Proximity Threshold Registers (0x0B, 0x0C) REGISTER B7 B6 PROX Threshold Indicator B5 B4 B3 B2 B1 B0 ABOVE PROX Threshold PRXTHR[7:0] REGISTER ADDRESS POWER-ON RESET STATE R/W 0x0B 0x00 R/W 0x0C 0x00 R/W The value set by PRXTHR[7:0] in combination with the ABOVE bit controls the operation of the proximity interrupt function.
PAGE 17
MAX44000 Ambient and Infrared Proximity Sensor Applications Information 2mm Ambient Sensing Applications Typical applications involve placing the IC behind a glass with a small semitransparent window placed above it. Use the photodiode sensitive area as shown in Figure 3 to properly position the window above the part. The part comes equipped with internal gain trim registers for the green and IR ALS photodiodes.
PAGE 18
MAX44000 Ambient and Infrared Proximity Sensor Interrupt Pin Voltage Compliance The interrupt pin can withstand external voltages up to 4V when in high-impedance mode per the absolute maximum ratings of the IC. However, when the voltage on the INT pin is higher than the VDD of the part (such as when external pullup voltage is greater than VDD of part), there is a small leakage current of 25µA sink into INT.
PAGE 19
MAX44000 Ambient and Infrared Proximity Sensor SDA tBUF tSU,STA tSU,DAT tHD,STA tHD,DAT tLOW tSP tSU,STO SCL tHIGH tHD,STA tR tF REPEATED START CONDITION START CONDITION STOP CONDITION START CONDITION Figure 4. 2-Wire Interface Timing Diagram Bit Transfer One data bit is transferred during each SCL cycle. The data on SDA must remain stable during the high period of the SCL pulse. Changes in SDA while SCL is high are control signals. See the START and STOP Conditions section.
PAGE 20
MAX44000 Ambient and Infrared Proximity Sensor Write Data Format A write to the IC includes transmission of a START condition, the slave address with the R/W bit set to 0, 1 byte of data to configure the internal register address pointer, one or more bytes of data, and a STOP condition. Figure 7 illustrates the proper frame format for writing 1 byte of data to the IC. The slave address with the R/W bit set to 0 indicates that the master intends to write data to the IC.
PAGE 21
MAX44000 Ambient and Infrared Proximity Sensor NOT ACKNOWLEDGE FROM MASTER ACKNOWLEDGE FROM MAX44000 ACKNOWLEDGE FROM MAX44000 S SLAVE ADDRESS 0 A REGISTER ADDRESS ACKNOWLEDGE FROM MAX44000 A Sr SLAVE ADDRESS REPEATED START R/W 1 DATA BYTE A R/W A P 1 BYTE Figure 8.
PAGE 22
MAX44000 Ambient and Infrared Proximity Sensor Typical Applications Circuit VLED = 1.7V TO 3.6V 1.7V TO 3.6V 1.7V TO 3.
PAGE 23
MAX44000 Ambient and Infrared Proximity Sensor Package Information For the latest package outline information and land patterns (footprints), 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 24
MAX44000 Ambient and Infrared Proximity Sensor Revision History REVISION NUMBER REVISION DATE 0 10/11 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. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed.