|
|
PDF ISL29028A Data sheet ( Hoja de datos )
| Número de pieza | ISL29028A | |
| Descripción | Low Power Ambient Light and Proximity Sensor | |
| Fabricantes | Intersil | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ISL29028A (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
Low Power Ambient Light and Proximity Sensor with
Intelligent Interrupt and Sleep Modes
ISL29028A
The ISL29028A is an integrated ambient and infrared light-to-
digital converter with a built-in IR LED driver and I2C Interface
(SMBus Compatible). This device uses two independent ADCs for
concurrently measuring ambient light and proximity in parallel.
The flexible interrupt scheme is designed for minimal
microcontroller utilization.
For ambient light sensor (ALS) data conversions, an ADC converts
photodiode current (with a light sensitivity range up to 2000 Lux)
in 100ms per sample. The ADC rejects 50Hz/60Hz flicker noise
caused by artificial light sources.
For proximity sensor (Prox) data conversions, the built-in driver
turns on an external infrared LED and the proximity sensor ADC
converts the reflected IR intensity to digital. This ADC rejects
ambient IR noise (such as sunlight) and has a 540μs conversion
time.
The ISL29028A provides low power operation of ALS and proximity
sensing with a typical 138μA normal operation current (110μA for
sensors and internal circuitry, ~28μA for external LED) with 220mA
current pulses for a net 100μs, repeating every 800ms (or under).
The ISL29028A uses both a hardware pin and software bits to
indicate an interrupt event has occurred. An ALS interrupt is
defined as a measurement which is outside a set window. A
proximity interrupt is defined as a measurement over a threshold
limit. The user may also require that both ALS/prox interrupts
occur at once, up to 16 times in a row before activating the
interrupt pin.
The ISL29028A is designed to operate from 2.25V to 3.63V over the
-40°C to +85°C ambient temperature range. It is packaged in a
clear, lead-free 8 lead ODFN package.
Applications
• Display and Keypad Dimming Adjustment and Proximity Sensing
for:
- Mobile Devices: Smart Phone, PDA, GPS
- Computing Devices: Laptop PC, Netbook
- Consumer Devices: LCD-TV, Digital Picture Frame, Digital
Camera
• Industrial and Medical Light and Proximity Sensing
Features
• Works Under All Light Sources Including Sunlight
• Dual ADCs Measure ALS/Prox Concurrently
• Intelligent Interrupt Scheme Simplifies μC Code
• 0.5% Typical Nonlinearity
Ambient Light Sensing
• Simple Output Code Directly Proportional to lux
• 50Hz/60Hz Flicker Noise and IR Rejection
• Light Sensor Close to Human Eye Response
• Selectable 125/2000 Lux Range
Proximity Sensing
• Proximity Sensor with Broad IR Spectrum
- Can Use 850nm and 950nm External IR LEDs
• IR LED Driver with I2C Programmable Sink Currents
- Net 100μs Pulse with 110mA or 220mA Amplitudes
- Periodic Sleep Time up to 800ms Between Pulses
• Ambient IR Noise Cancellation (Including Sunlight)
Intelligent and Flexible Interrupts
• Independent ALS/Prox Interrupt Thresholds
• Adjustable Interrupt Persistency
- 1/4/8/16 Consecutive Triggers Required Before Interrupt
Ultra Low Power
• 138μA DC Typical Supply Current for ALS/Prox Sensing
- 110μA for Sensors and Internal Circuitry
- 28μA Typical Current for External IR LED (Assuming 220mA
for 100μs Every 800ms)
• <1.0μA Supply Current When Powered Down
Easy to Use
• Set Registers; Wait for Interrupt
• I2C (SMBus Compatible) Output
• Temperature Compensated
• Tiny ODFN8 2.0x2.1x0.7 (mm) Package
Additional Features
• 1.7V to 3.63V Supply for I2C Interface
• 2.25V to 3.63V Sensor Power Supply
• Pb-Free (RoHS Compliant)
• I2C Address Selection Pin
www.DataSheet4U.com
February 8, 2011
FN7721.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2010, 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL29028A
I2C Electrical Specifications For SCL and SDA unless otherwise noted, VDD = 3V, TA = +25°C, REXT = 499kΩ 1% tolerance
(Note 12). (Continued)
PARAMETER
DESCRIPTION
CONDITION
MIN TYP MAX UNIT
tSU:DAT
tR
tF
tSU:STO
tBUF
Data Set-up Time
Rise Time of both SDA and SCL Signals
Fall Time of both SDA and SCL Signals
Set-up Time for STOP Condition
Bus Free Time Between a STOP and START
Condition
(Note 13)
(Note 13)
100
20 + 0.1xCb
20 + 0.1xCb
600
1300
ns
ns
ns
ns
ns
Cb Capacitive Load for Each Bus Line
Rpull-up
SDA and SCL System Bus Pull-up Resistor
Maximum is determined by tR and tF
tVD;DAT
Data Valid Time
tVD:ACK
Data Valid Acknowledge Time
VnL Noise Margin at the LOW Level
VnH Noise Margin at the HIGH Level
NOTES:
12. All parameters in I2C Electrical Specifications table are guaranteed by design and simulation.
13. Cb is the capacitance of the bus in pF.
1
0.1VDD
0.2VDD
400 pF
kΩ
0.9 µs
0.9 µs
V
V
www.DataSheet4U.com
FIGURE 1. I2C TIMING DIAGRAM
5
FN7721.1
February 8, 2011
5 Page 
ISL29028A
Typical Circuit
A typical application for the ISL29028A is shown in Figure 5. The
ISL29028A’s I2C address is internally hardwired as
0b100010<x>, with x representing the logic state of input I2C
address pin ADDR0. The device can be tied onto a system’s I2C
bus together with other I2C compliant devices.
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, and is qualified to
+260°C. A standard reflow soldering profile with a +260°C
maximum is recommended.
Suggested PCB Footprint
It is important that users check the “Surface Mount Assembly
Guidelines for Optical Dual FlatPack No Lead (ODFN) Package”
before starting ODFN product board mounting.
(http://www.intersil.com/data/tb/TB477.pdf)
Layout Considerations
The ISL29028A is relatively insensitive to layout. Like other I2C
devices, it is intended to provide excellent performance even in
significantly noisy environments. There are only a few
considerations that will ensure best performance.
Route the supply and I2C traces as far as possible from all sources of
noise. A 0.1µF and 1µF power supply decoupling capacitors need to be
placed close to the device.
ALS Sensor Window Layout
Special care should be taken to ensure that the sensor, as
outlined in the sensor location outline, is uniformly illuminated.
Shadows that result from off angle window openings that affect
that uniform illumination can affect the measurement results.
R1
10kΩ
R2
10kΩ
R3
10kΩ
VI2C_PULL-UP
VDD
VIR-LED
C1 C2
1µF 0.1µF
SLAVE_0
1 ADDR0 IRDR 8
2 VDD
3 GND
4 REXT
7
INT
SDA
SCL
6
5
REXT ISL29028A
499kΩ
SLAVE_1
SDA
SCL
I2C SLAVE_n
SDA
SCL
FIGURE 5. ISL29028A TYPICAL CIRCUIT
I2C MASTER
MICROCONTROLLER
INT
SDA
SCL
www.DataSheet4U.com
11 FN7721.1
February 8, 2011
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ISL29028A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ISL29028 | Low Power Ambient Light and Proximity Sensor | Intersil |
| ISL29028A | Low Power Ambient Light and Proximity Sensor | Intersil |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |