SI1141(2011) View Datasheet(PDF) - Silicon Laboratories

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SI1141
(Rev.:2011)

PROXIMITY/AMBIENT LIGHT SENSOR IC WITH I2C INTERFACE

Silicon Laboratories 

Si1141/42/43

Table 3. Performance Characteristics1 (Continued)

Parameter

Symbol

Conditions

Min Typ Max Units

LED1, LED2, LED3

Active Current

ILEDx

Actively Measuring Time3

VDD = 3.3 V, single drive

VLEDn = 1 V, PS_LEDn = 0001

VLEDn = 1 V, PS_LEDn = 0010

VLEDn = 1 V, PS_LEDn = 0011

VLEDn = 1 V, PS_LEDn = 0100

VLEDn = 1 V, PS_LEDn = 0101

VLEDn = 1 V, PS_LEDn = 0110

VLEDn = 1 V, PS_LEDn = 0111

VLEDn = 1 V, PS_LEDn = 1000

VLEDn = 1 V, PS_LEDn = 1001

VLEDn = 1 V, PS_LEDn = 1010

VLEDn = 1 V, PS_LEDn = 1011

VLEDn = 1 V, PS_LEDn = 1100

VLEDn = 1 V, PS_LEDn = 1101

VLEDn = 1 V, PS_LEDn = 1110

VLEDn = 1 V, PS_LEDn = 1111

Single PS

ALS VIS + ALS IR

Two ALS plus three PS

— 5.6

TBD

— 11.2 TBD

— 22.4 TBD

— 45

TBD

— 67

TBD

— 90

TBD

— 112

— 135

TBD

TBD

mA

— 157 TBD

— 180 TBD

— 202 TBD

— 224 TBD

— 269 TBD

— 314 TBD

— 359 TBD

— 155 TBD

µs

— 285 TBD

µs

— 660 TBD

µs

PS Min Detectable

Reflectance Input4

EMIN

VDD = 3.3 V

 = 850 nm

— 0.1

1

µW/

cm2

PS Max Detectable

Reflectance Input

ALS Range5

EMAX

VDD = 3.3 V

 = 850 nm

25 —

10m —

—

128k

mW/

cm2

lx

ALS Flicker Noise Error

VDD = 3.3 V

— ±5

—

%

SCL, SDA, INT Output

Low Voltage

VOL

I = 4 mA, VDD > 2.0 V

I = 4 mA, VDD < 2.0 V

—

— VDDx0.2 V

——

0.4

V

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. Represents the time during which the device is drawing a current equal to Iactive for power estimation purposes.

Assumes default settings.

4. Applies to single 25.6 µs pulse measurement. By increasing irLED pulse width, 0.001 µW/cm2 under low light is

possible.

5. ALS Sensitivity under low light conditions can be improved by increasing ADC integration time. 10 mlx resolution

possible under the highest ADC integration time setting.

6

Preliminary Rev. 0.5

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