ISL29023 Datasheet, PDF (1/14 Pages) Intersil Corporation – Integrated Digital Ambient Light Sensor with Interrupt Function

Integrated Digital Light Sensor with Interrupt
ISL29023
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.
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 & 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
VBUS
VDD
SDA
RR R
10µF
1
VDD
6 SDA
0.1µF
MCU SCL
GPIO
5 SCL
REXT ₃
4 INT
VSS
2
500k
FIGURE 1. ISL29023 TYPICAL APPLICATION DIAGRAM
1.2
HUMAN EYE
1.0
0.8
0.6
0.4
IR SENSING
0.2
0
AMBIENT LIGHT SENSING
-0.2
300 400 500 600 700 800 900 1000 1100
WAVELENGTH (nm)
FIGURE 2. NORMALIZED SPECTRAL RESPONSE FOR AMBIENT
LIGHT SENSING AND IR SENSING
July 17, 2012
1
FN6691.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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