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Integrated Low Voltage I2C Ambient Light, Gesture and Proximity Sensor
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Model Number
LTR-91400 -
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LTR-91400 -
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Product Description
LTR-91400 Ambient Light Sensor, Gesture Sensor and Proximity Sensor Description
LTR-91400is an integrated low voltage I2C ambient light sensor [ALS], gesture sensor [GS] and proximity sensor [PS], with built-in emitter in a single miniature chipled lead-free surface mount package.
This sensor converts light intensity to a digital output signal capable of direct I2C interface. The gesture sensor provides object motion direction information based on the reflected IR light detected by the 4 photodiodes for East, West, North and South direction. Besides, ambient light sensor provides a linear response over a wide dynamic range and is well suited to applications under high ambient brightness. With built-in proximity sensor (emitter and detector), it offers the feature to detect object at a user configurable distance.
The sensor supports an interrupt feature that removes the need to poll the sensor for a reading which improves system efficiency. The sensor also supports several features that help to minimize the occurrence of false triggering. This CMOS design and factory-set one time trimming capability ensure minimal sensor-to-sensor variations for ease of manufacturability to the end customers.
LTR-91400 Ambient Light Sensor, Gesture Sensor and Proximity Sensor Application
To control brightness of the display panel, and/or detection of object or motion in mobile, computing, and consumer devices.
LTR-91400 Ambient Light Sensor, Gesture Sensor and Proximity Sensor Features
• I2C interface (Standard mode @100kHz or Fast mode @400kHz)
• Gesture, Ambient Light, and Proximity Sensing in one ultra-small ChipLED package
• Very low power consumption with sleep mode capability
• Operating voltage ranges: 2.4V to 3.6V
• Operating temperature ranges: -30 to +70°C
• Programmable interrupt function for ALS, PS, and GS.
• Built-in temperature compensation circuit
• RoHS and Halogen free compliant
• GS Features
- 4 photodiodes for East, West, North and South direction
- 32 dataset storage FIFO
- 8-bit effective resolution
- Programmable LED drive settings
- Programmable crosstalk correction
• ALS Features
- 16-bits effective resolution
- Wide dynamic range of 1:15,000,000 with linear response
- Close to human eye spectral response
- Automatic rejection for 50Hz/60Hz lighting flicker
• PS Features
- Built-in LED driver and detector
- 11-bit effective resolution
- Programmable LED drive settings
- Programmable crosstalk correction
- High Ambient Light Suppression
LTR-91400 Ambient Light Sensor, Gesture Sensor and Proximity Sensor Rating and Specification
Absolute Maximum Rating at Ta=25°C
Note: Exceeding these ratings could cause damage to the sensor. All voltages are with respect to ground. Currents are positive into, negative out of the specified terminal.
Recommended Operating Conditions
Electrical Specifications (VDD = 3.0V, Ta=25°C, unless otherwise noted)
Characteristics ALS Ambient Light Sensor
Characteristics Proximity Sensor
Characteristics Gesture Sensor
LTR-91400is an integrated low voltage I2C ambient light sensor [ALS], gesture sensor [GS] and proximity sensor [PS], with built-in emitter in a single miniature chipled lead-free surface mount package.
This sensor converts light intensity to a digital output signal capable of direct I2C interface. The gesture sensor provides object motion direction information based on the reflected IR light detected by the 4 photodiodes for East, West, North and South direction. Besides, ambient light sensor provides a linear response over a wide dynamic range and is well suited to applications under high ambient brightness. With built-in proximity sensor (emitter and detector), it offers the feature to detect object at a user configurable distance.
The sensor supports an interrupt feature that removes the need to poll the sensor for a reading which improves system efficiency. The sensor also supports several features that help to minimize the occurrence of false triggering. This CMOS design and factory-set one time trimming capability ensure minimal sensor-to-sensor variations for ease of manufacturability to the end customers.
LTR-91400 Ambient Light Sensor, Gesture Sensor and Proximity Sensor Application
To control brightness of the display panel, and/or detection of object or motion in mobile, computing, and consumer devices.
LTR-91400 Ambient Light Sensor, Gesture Sensor and Proximity Sensor Features
• I2C interface (Standard mode @100kHz or Fast mode @400kHz)
• Gesture, Ambient Light, and Proximity Sensing in one ultra-small ChipLED package
• Very low power consumption with sleep mode capability
• Operating voltage ranges: 2.4V to 3.6V
• Operating temperature ranges: -30 to +70°C
• Programmable interrupt function for ALS, PS, and GS.
• Built-in temperature compensation circuit
• RoHS and Halogen free compliant
• GS Features
- 4 photodiodes for East, West, North and South direction
- 32 dataset storage FIFO
- 8-bit effective resolution
- Programmable LED drive settings
- Programmable crosstalk correction
• ALS Features
- 16-bits effective resolution
- Wide dynamic range of 1:15,000,000 with linear response
- Close to human eye spectral response
- Automatic rejection for 50Hz/60Hz lighting flicker
• PS Features
- Built-in LED driver and detector
- 11-bit effective resolution
- Programmable LED drive settings
- Programmable crosstalk correction
- High Ambient Light Suppression
LTR-91400 Ambient Light Sensor, Gesture Sensor and Proximity Sensor Rating and Specification
Absolute Maximum Rating at Ta=25°C
|
Parameter |
Symbol |
Rating |
Unit |
|
Supply Voltage |
VDD |
3.8 |
V |
|
Digital Voltage Range |
SCL, SDA, INT |
-0.5 to 3.8 |
V |
|
Digital Output Current |
SCL, SDA, INT |
-1 to 20 |
mA |
|
Storage Temperature |
Tstg |
-40 to 85 |
°C |
Recommended Operating Conditions
|
Description |
Symbol |
Min. |
Typ. |
Max. |
Unit |
|
Supply Voltage |
VDD |
2.4 |
|
3.6 |
V |
|
LED Supply Voltage |
VLED |
2.5 |
|
4.35 |
V |
|
Interface Bus Power Supply Voltage |
VIO |
1.7 |
|
3.6 |
V |
|
I2C Bus Input Pin High Voltage |
VIH_SCL, VIH _SDA |
1.2 |
|
|
V |
|
I2C Bus Input Pin Low Voltage |
VIL_SCL, VIL_SDA |
|
|
0.6 |
V |
|
Operating Temperature |
Tope |
-30 |
|
70 | °C |
Electrical Specifications (VDD = 3.0V, Ta=25°C, unless otherwise noted)
|
Parameter |
Min. |
Typ. |
Max |
Unit |
Condition |
|
Active Supply Current 1 |
|
210 |
|
uA |
ALS in active mode ALS integration time = 100ms ALS measurement repeat rate = 400ms |
|
Active Supply Current 2 |
|
100 |
|
uA |
PS in active mode, 25% Duty Cycle, 8us Pulse Width, 100mA, 8 Pulses PS measurement repeat rate = 100ms Not including VLED current |
|
Active Supply Current 3 |
|
450 |
|
uA |
GS+PSin active mode, 25% Duty Cycle, 8us Pulse Width, 100mA, 8 Pulses PS measurement repeat rate = 100ms Full 32 dataset, GS wait time = 0ms |
|
Standby Current |
|
|
5 |
uA |
Standby / Sleep Mode |
|
Initial Startup Time |
|
|
100 | ms |
Min wait time after power up (supply ramp up to 2.4V) before sending I2C commands |
|
Wakeup Time from Standby |
|
|
10 |
ms |
Max wait time after turning device from stand-by to active before measurements starts |
|
Leakage Current |
-5 |
|
5 |
uA |
SDA, SCL, INT pins |
Characteristics ALS Ambient Light Sensor
|
Parameter |
Min. |
Typ. |
Max. |
Unit |
Condition |
|
Full ADC Resolution |
|
16 |
|
bits |
|
|
Dark Count |
|
0 |
10 |
count |
Lux = 0, Tope=25°C |
|
ADC Ch0 Count Gain X128 |
|
34000 |
|
count |
Lux=100, White LED, CCT~5K |
|
ALS Lux Accuracy |
-20 |
|
20 |
% |
|
|
50/60 Hz flicker noise error |
-5 |
|
5 |
% |
|
Characteristics Proximity Sensor
|
Parameter |
Min. |
Typ. |
Max. |
Unit |
Condition |
|
Full ADC Resolution |
|
11 |
|
bits |
|
|
LED peak wavelength |
|
940 |
|
nm |
|
|
Detection Distance |
50 |
|
|
mm |
Under dark tinted window 25% Duty Cycle, 8us Pulse Width, 100mA, 2 Pulses, 18% Gray Card |
|
LED Pulse Width |
|
8 |
|
us |
|
|
LED Duty Cycle |
|
25 |
|
% |
|
|
LED Peak Current |
12.5 |
|
300 | mA |
Programmable LED current |
|
Measurement repeat rate |
6.125 |
|
800 |
msec |
|
|
Number of LED Pulses |
1 |
|
15 |
Pulses |
|
|
Ambient Light Suppression |
|
|
50K |
lux |
Direct Sunlight |
Characteristics Gesture Sensor
|
Parameter |
Min. |
Typ. |
Max. |
Unit |
Condition |
|
Full ADC Resolution |
|
8 |
|
bits |
|
|
LED peak wavelength |
|
940 |
|
nm |
|
|
FIFO RAM |
|
32 |
|
set |
Sets of 4 bytes |
|
Detection Distance |
|
10 |
|
cm |
With recommended optical design |
|
LED Pulse Width |
|
8 |
|
us |
|
|
LED Duty Cycle |
|
25 |
|
% |
|
|
LED Peak Current |
12.5 |
|
300 | mA |
|