ISL29038IROZ-EVALZ XICOR [Xicor Inc.], ISL29038IROZ-EVALZ Datasheet

ISL29038IROZ-EVALZ

Manufacturer Part Number

ISL29038IROZ-EVALZ

Description

Low Power Ambient Light and Proximity Sensor with Enhanced Infrared Rejection

Manufacturer

XICOR [Xicor Inc.]

Datasheet

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VDD_ANALOG

Low Power Ambient Light and Proximity Sensor with

Enhanced Infrared Rejection

ISL29038

The ISL29038 is a low power Ambient Light Sensor (ALS) and

proximity (PROX) sensor. It has a built-in IR-LED driver for

proximity function. The ALS function measures the amount of

light (in the visible spectrum) incident on the ISL29038.

The ALS function has a programmable ambient IR-rejection,

which allows fine tuning of light source variations and is ideal

for light sensor applications under dark protective glass. The

ALS provides a 12-bit measurement. A passive optical filter

removes unwanted wavelengths (IR or Ultraviolet) to ensure

accurate ALS measurement.

The proximity function includes a new offset adjustment to

compensate for the IR light reflected off the inside of the

protective glass cover and back to the ISL29038 sensor. This

offset adjustment allows the sensor to compensate for these

internal reflections and preserve the dynamic range of the

proximity measurement.

The built-in current-driver pulses an external infrared LED at a

programmed current for 90µs. The infrared light that is

reflected and received by ISL29038 is digitized by an 8-bit

ADC. The proximity sensor also has a passive optical filter

designed to pass IR and reject visible wavelengths.

The ISL29038 provides a hardware pin to indicate an interrupt

event. The interrupt pin saves power as the host micro-controller

can ‘wake-up’ on an interrupt event and does not need to poll

the device for an interrupt event. The interrupt generator is

user configurable and provides several options for ALS and

PROX trigger configurations. The ISL29038 supports an

SMBus compatible I

October 12, 2012

FN7851.0

VDD_IRLED

1µF

100

FIGURE 1. TYPICAL APPLICATIONS CIRCUIT

C interface for configuration and control.

1µF

499k

GNDIR

AVDD

AGND

REXT

ISL29038

: 499k 1% RESISTOR

: 100Ω 5% RESISTOR

, C

: OSRAM SFH4650 INFRARED LED

IRLED

IRDR

SDA

SCL

: 1µF CERAMIC 10V CAPACITOR

INT

SCL, SDA AND

INT PULLUPs

SMBus MASTER

INT

SDA

SCL

VDD_PULLUP

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

Features

• Ideal for applications under dark or tinted glass

• Enhanced ambient sunlight rejection to 40k Lux

• Programmable proximity sleep time between proximity

• Hardware interrupt - no polling required

• Programmable IR compensation to fine tune ALS

• Up to 4000 Lux, four selectable ALS ranges

• Programmable IR LED drive current to 250mA

• Operates from 2.25V to 3.63V V

• Power Down I

• Tiny 2.1x2.0x0.7 (mm) ODFN package

Applications

• Display dimming and adjustment

• Object detection

100

measurements optimizes power consumption

performance for various glass compositions

- Mobile devices: smart phones, PDA, GPS

- Computing: monitors, laptops, notebooks

- Picture frames, tablet-PCs, LCD-TV

- Touchscreen disabling

- Smart power-saving

All other trademarks mentioned are the property of their respective owners.

18% GREY CARD PROXIMITY DISTANCE (mm)

FIGURE 2. PROXIMITY SENSITIVITY

DD,

typical 0.2µA

250mA

125mA

62.5mA

31.25mA

Related parts for ISL29038IROZ-EVALZ

ISL29038IROZ-EVALZ Summary of contents

Page 1

Low Power Ambient Light and Proximity Sensor with Enhanced Infrared Rejection ISL29038 The ISL29038 is a low power Ambient Light Sensor (ALS) and proximity (PROX) sensor. It has a built-in IR-LED driver for proximity function. The ALS function measures the ...

Page 2

... REXT 4 Ordering Information PART NUMBER (Notes ISL29038IROZ-T7 N/A ISL29038IROZ-EVALZ Evaluation Board NOTES: 1. Refer to TB347 for details on reel specifications. 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu plate - e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020 ...

Page 3

Absolute Maximum Ratings V Supply Voltage between VDD and GND . . . . . . . . . . . . . . . . . . . . . .4. Bus Pin Voltage (SCL, ...

Page 4

Electrical Specifications V PARAMETER DESCRIPTION DATA Full Scale Prox ADC Code PROX_F ProxWASH Washout Bit Activation Level ProxOffsetMax Maximum PROX Offset, Referenced to Proximity ADC Range ProxOffsetInc Proximity Offset Adjust Increment Referenced to Proximity ADC Range LED DRIVER (IRDR PIN) ...

Page 5

I C Electrical Specifications For SCL and SDA unless otherwise noted, V SYMBOL PARAMETER t Rise Time of both SDA and SCL Signals R t Fall Time of both SDA and SCL Signals F t Set-up Time for STOP ...

Page 6

ISL29038 Configuration and Control Interface ISL29038 configuration and control is performed using the I 2 SMBus. The ISL29038’ interface slave address is internally hard wired as 8’b1000100x, where x denotes the R/W bit. 2 Every ...

Page 7

Typical Performance Curves 100 90 80 250mA 70 125mA 18% GREY CARD PROXIMITY DISTANCE (mm) FIGURE 6. PROXIMITY SENSITIVITY (Note 12 50 16k ...

Page 8

ISL29038 Register Set TABLE 1. ISL29038 CONFIGURATION AND CONTROL REGISTERS ADDRESS POWER-ON (HEX) REGISTER NAME DEFAULT 0x00 Device ID b11000xxx 0x01 Config0 0x00 0x02 Config1 0x00 0x03 Config2 0x00 0x04 INTConfig 0x10 8 ISL29038 REGISTER BIT FUNCTION ACCESS FIELDS NAME/VALUE ...

Page 9

TABLE 1. ISL29038 CONFIGURATION AND CONTROL REGISTERS (Continued) ADDRESS POWER-ON (HEX) REGISTER NAME DEFAULT 0x05 PROX_INT_TL 0x00 0x06 PROX_INT_TH 0xFF 0x07 ALS_INT_TL 0x00 0x08 ALS_INT_TLH 0x0F 0x09 ALS_INT_TH 0xFF 0x0A PROX_DATA 0x0B ALS_DATA_HB 0x0C ALS_DATA_LB 0x0D PROX_AMBIR 0x0E Config3 0x00 ...

Page 10

Registers 0x01, 0x02 are used to configure the primary proximity and ALS parameters. Register 0x03 is used for optimizing IR compensation in ALS measurements. A procedure to optimize IR compensation is described in “ALS IR Compensation” on page 11. Register ...

Page 11

ALS IR Compensation The ISL29038 is designed for operation under dark glass cover. Glass or plastic covers can significantly attenuate visible light and pass the Infrared light without much attenuation. Consequently, the ISL29038 under a glass cover experiences an IR ...

Page 12

Reg 0x04[4]. Following power-up, a ‘Brown-Out’ condition, if detected, is reported by PWR_FAIL flag by Reg 0x04[4]. Device configuration registers are not set to their power-up default after ...

Page 13

Soldering Considerations Convection heating is recommended for reflow soldering; direct-infrared heating is not recommended. The plastic ODFN package does not require a custom reflow soldering profile. A standard reflow soldering profile with a +260°C maximum is recommended. Additional information regarding ...

Page 14

Revision History The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you have the latest revision. DATE REVISION October 12, 2012 FN7851.0 Initial Release. ...

Page 15

Package Outline Drawing L8.2.1x2.0 8 LEAD OPTICAL DUAL FLAT NO-LEAD PLASTIC PACKAGE (ODFN) Rev 3, 1/11 2.10 6 PIN 1 INDEX AREA (2X) 0.10 TOP VIEW 2.50 2.10 (6x0.50) (8x0.20) (8x0.55) (0.75) TYPICAL RECOMMENDED LAND PATTERN 15 ISL29038 A 0.15 ...

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