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PDF SI1141 Data sheet ( Hoja de datos )
| Número de pieza | SI1141 | |
| Descripción | PROXIMITY/AMBIENT LIGHT SENSOR IC | |
| Fabricantes | Silicon Laboratories | |
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Si1141/42/43
PROXIMITY/AMBIENT LIGHT SENSOR IC WITH I2C INTERFACE
Features
Integrated infrared proximity detector Accurate lux measurements with IR
Proximity detection adjustable from
correction algorithm
under 1 cm up to 200 cm
Industry's lowest power consumption
Three independent LED drivers
1.71 to 3.6 V supply voltage
15 current settings from 5.6 mA to 9 µA average current (LED pulsed
360 mA for each LED driver
25.6 µs every 800 ms at 180 mA
25.6 µs LED driver pulse width
plus 3 µA Si114x supply)
50 cm proximity range with single
< 500 nA standby current
pulse (<3 klx)
25.6 µs LED “on” time keeps total
15 cm proximity range with single
power consumption duty cycle low
pulse (>3 klx)
without compromising performance
Operates at up to 128 klx (direct
or noise immunity
sunlight)
Internal and external wake support
High reflectance sensitivity
Built-in voltage supply monitor and
< 1 µW/cm2
power-on reset controller
High EMI immunity without shielded Serial communications
packaging
Up to 3.4 Mbps data rate
Integrated ambient light sensor
Slave mode hardware address
100 mlx resolution possible,
decoding (0x5A)
allowing operation under dark glass Small-outline 10-lead 2x2 mm QFN
1 to 128 klx dynamic range possible Temperature Range
across two ADC range settings
–40 to +85 °C
Applications
Handsets
Heart rate monitoring
Pulse oximetry
Wearables
Audio products
Security panels
Tamper detection circuits
Dispensers
Description
Valve controls
Smoke detectors
Touchless switches
Touchless sliders
Occupancy sensors
Consumer electronics
Industrial automation
Display backlighting control
Photo-interrupters
The Si1141/42/43 is a low-power, reflectance-based, infrared proximity and ambient
light sensor with I2C digital interface and programmable-event interrupt output. This
touchless sensor IC includes an analog-to-digital converter, integrated high-
sensitivity visible and infrared photodiodes, digital signal processor, and one, two, or
three integrated infrared LED drivers with fifteen selectable drive levels. The Si1141/
42/43 offers excellent performance under a wide dynamic range and a variety of light
sources including direct sunlight. The Si1141/42/43 can also work under dark glass
covers. The photodiode response and associated digital conversion circuitry provide
excellent immunity to artificial light flicker noise and natural light flutter noise. With
two or more LEDs, the Si1142/43 is capable of supporting multiple-axis proximity
motion detection. The Si1141/42/43 devices are provided in a 10-lead 2x2 mm QFN
package and are capable of operation from 1.71 to 3.6 V over the –40 to +85 °C
temperature range.
Pin Assignments
SDA
SCL
VDD
INT
DNC
10
1
9
28
QFN-10
37
46
5
DNC
LED1
GND
LED3/CVDD
LED2/CVDD
Rev. 1.4 10/14
Copyright © 2014 by Silicon Laboratories
Si1141/42/43
1 page  
Si1141/42/43
Table 2. Performance Characteristics1 (Continued)
Parameter
Symbol
Condition
Min Typ
Max
Unit
IDD Standby Mode
IDD Actively Measuring
Peak IDD while LED1,
LED2, or LED3 is
Actively Driven
LED Driver Saturation
Voltage2,3
Isb
Iactive
No ALS / PS Conversions
No I2C Activity
VDD =3.3 V
Without LED influence, VDD = 3.3 V
VDD = 3.3 V
Vdd = 1.71 to 3.6 V
PS_LEDn = 0001
PS_LEDn = 0010
PS_LEDn = 0011
PS_LEDn = 0100
PS_LEDn = 0101
PS_LEDn = 0110
PS_LEDn = 0111
PS_LEDn = 1000
PS_LEDn = 1010
PS_LEDn = 1010
PS_LEDn = 1011
PS_LEDn = 1100
PS_LEDn = 1101
PS_LEDn = 1110
PS_LEDn = 1111
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1.4
4.3
8
50
60
70
80
115
150
185
220
255
290
315
340
360
385
410
—
5.5
—
70
105
105
105
450
450
450
450
450
450
600
600
600
600
600
µA
mA
mA
mV
LED1, LED2, LED3
Pulse Width
LED1, LED2, LED3,
INT, SCL, SDA
Leakage Current
tPS
VDD = 3.3 V
— 25.6
–1 —
30
1
µs
µA
Notes:
1. Unless specifically stated in "Conditions", electrical data assumes ambient light levels < 1 klx.
2. Proximity-detection performance may be degraded, especially when there is high optical crosstalk, if the LED supply
and voltage drop allow the driver to saturate and current regulation is lost.
3. Guaranteed by design and characterization.
4. Represents the time during which the device is drawing a current equal to Iactive for power estimation purposes.
Assumes default settings.
Rev. 1.4
5
5 Page 
Si1141/42/43
Figure 5. View angle, large photodiode rotated around the pin-5/pin-10 (“vertical”) axis
Figure 6. View angle, large photodiode rotated around “horizontal”axis and small photodiode
rotated around either axis
Rev. 1.4
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SI1141.PDF ] | |
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