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PDF ISL29027 Data sheet ( Hoja de datos )
| Número de pieza | ISL29027 | |
| Descripción | Proximity Sensor | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Proximity Sensor with Intelligent Interrupt and Sleep Modes
ISL29027
The ISL29027 is an integrated infrared light-to-digital converter
with a built-in IR LED driver and I2C Interface (SMBus Compatible).
The flexible interrupt scheme is designed for minimal
microcontroller utilization.
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 ISL29027 provides 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 ISL29027 uses both a hardware pin and software bits to
indicate an interrupt event has occurred. A proximity interrupt is
defined as a measurement over a threshold limit. The user may
also require that proximity interrupts occur at once, up to 16
times in a row before activating the interrupt pin.
The ISL29027 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
- Mobile Devices: Smart Phone, PDA, GPS
- Computing Devices: Laptop PC, Netbook
- Consumer Devices: LCD-TV, Digital Picture Frame, Digital
Camera
Features
• Works Under All Light Sources Including Sunlight
• Intelligent Interrupt Scheme Simplifies μC Code
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
• Proximity Interrupt Thresholds
• Adjustable Interrupt Persistency
- 1/4/8/16 Consecutive Triggers Required Before Interrupt
Ultra Low Power
• 138μA DC Typical Supply Current for 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
2
February 2, 2012
FN7815.1
LIGHT DATA
PROCESS
IR
IR PHOTODIODE
ARRAY
IREF
FOSC
CHANNEL
ADC
COMMAND
REGISTER
DATA
REGISTER
I2C
INTERRUPT
1 ADDR0
5 SCL
6 SDA
7 INT
IR DRIVER
8 IRDR
4
REXT
1
3
GND
FIGURE 1. BLOCK DIAGRAM
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2011, 2012. 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  
ISL29027
FIGURE 2. I2C TIMING DIAGRAM
Register Map
There are ten 8-bit registers accessible via I2C. Registers 0x1 and
0x2 define the operation mode of the device. Registers 0x3 and 0x4
store the various Prox thresholds which trigger interrupt events.
Registers 0x8 store the results of Prox ADC conversions.
ADDR
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0E
0x0F
REG NAME
(n/a)
CONFIGURE
INTERRUPT
PROX_LT
PROX_HT
(n/a)
(n/a)
(n/a)
PROX_DATA
(n/a)
(n/a)
TEST1
TEST2
7
PROX EN
PROX_FLAG
TABLE 1. ISL29028A REGISTERS AND REGISTER BITS
BIT
654321
(Reserved)
PROX_SLP[2:0]
PROX_DR
(Write 0)
(Write0)
PROX_PRST[1:0]
(Write 0)
(Write0)
(Write 0)
PROX_LT[7:0]
PROX_HT[7:0]
(Reserved)
(Reserved)
(Reserved)
PROX_DATA[7:0]
(Reserved)
(Reserved)
(Write as 0x00)
(Write as 0x00)
0
(Write0)
(Write 0)
DEFAULT
(n/a)
0x00
0x00
0x00
0xFF
(n/a)
(n/a)
(n/a)
0x00
(n/a)
(n/a)
0x00
0x00
5 FN7815.1
February 2, 2012
5 Page 
ISL29027
2.10
18
2.00
2
0.43
3
4
7
6
0.50
5
0.42
FIGURE 11. 8 LD ODFN SENSOR LOCATION OUTLINE - DIMENSIONS IN mm
11 FN7815.1
February 2, 2012
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ISL29027.PDF ] | |
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