The ISL29023 is an integrated ambient and infrared light to

digital converter with I2C (SMBus Compatible) Interface. Its

advanced self-calibrated photodiode array emulates human eye

response with excellent IR rejection. The on-chip ADC is capable

of rejecting 50Hz and 60Hz flicker caused by artificial light

sources. The lux range select feature allows users to program the

lux range for optimized counts/lux.

For ambient light sensing, an internal 16-bit ADC has been

designed based upon the charge-balancing technique. The

ADC conversion time is nominally 90ms and is user adjustable

from 11μs to 90ms, depending on oscillator frequency and

ADC resolution. In normal operation, typical current

consumption is 70μA. In order to further minimize power

consumption, two power-down modes have been provided. If

polling is chosen over continuous measurement of light, the

auto-power-down function shuts down the whole chip after

each ADC conversion for the measurement. The other

power-down mode is controlled by software via the I2C

interface. The power consumption can be reduced to less than

0.3μA when powered down.

The ISL29023 supports a software and hardware interrupt that

remains asserted until the host clears it through I2C interface.

Function of ADC conversion continues without stopping after

interrupt is asserted.

Designed to operate on supplies from 2.25V to 3.63V with an I2C

supply from 1.7V to 3.63V, the ISL29023 is specified for

operation over the -40°C to +85°C ambient temperature range.

特性 Features

? Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16-bits ADC

? Integrated noise reduction . . . . . . . . . . . . . . . . . . . . . 50/60Hz

? Light sensor close to human eye response

? Excellent light sensor IR and UV rejection

? Range selection via I2C

- Range1 = 0.015 to 1,000 Lux

- Range2 = 0.06 to 4,000 Lux

- Range3 = 0.24 to 16,000 Lux

- Range4 = 0.96 to 64,000 Lux

? Shutdown modes . . . . . . . . . . . . . . . .Software and Automatic

? Supply current (Max) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85μA

? Shutdown current (Max) . . . . . . . . . . . . . . . . . . . . . . . . . .0.3μA

? Control interface . . . . . . . . . . . . . . . I2C and SMB Compatible

? I2C power supply . . . . . . . . . . . . . . . . . . . . . . . . . 1.7V to 3.63V

? Sensor power supply . . . . . . . . . . . . . . . . . . . . . 2.25V to 3.63V

? Operating temperature range. . . . . . . . . . . . . -40°C to +85°C

? Small form factor package . . . . . . . . .6 Ld 2.0x2.1x0.7 ODFN

Applications

? Mobile devices: smart phone, PDA, GPS

? Computing devices: Notebook PC, Webpad

? Consumer devices: LCD-TV, digital picture frame, digital camera

? Industrial and medical light sensing