Infrared light to digital converter SENSORTEK STK3331-A with ambient light sensing and on chip timing controller
Product Overview
The STK3331-A is an integrated ambient and infrared light to digital converter featuring a built-in IR LED and I2C interface. It offers robust backlight/display brightness control through ambient light sensing and proximity estimation with an interrupt function via infrared sensing. The device incorporates a photodiode, timing controller, and ADC on a single chip. Its ambient light sensing exhibits a spectral response close to the human eye, suitable for a wide range of light intensities. For proximity sensing, the spectral response is optimized for 940nm infrared light. The STK3331-A provides programmable current settings for the IR LED, noise cancellation for ambient IR rejection, excellent temperature compensation, and on-chip refresh rate setting without external components. A software shutdown mode is available for power-saving applications. The operating voltage range is 1.7V to 3.0V.
Product Attributes
- Brand: Sensortek Technology Corp.
- Certifications: RoHS compliant
Technical Specifications
| Parameter | Min. | Typ. | Max. | Unit | Condition |
| Supply voltage (VDD) | 1.7 | 3.0 | V | ||
| I2C Clock frequency | 400 | KHz | |||
| Operation temperature | -40 | 85 | C | ||
| ALS only supply current | 192 | 240 | 288 | A | Note 1,2 |
| PS only supply current | 208 | 260 | 312 | A | Note 1,2 |
| Shutdown current | 1.36 | 30 | A | Note 1,2 | |
| Peak sensitivity wavelength (ALS) | 550 | nm | |||
| Full scale ALS counts | 65535 | counts | |||
| ALS dark offset | 0 | 3 | counts | Note 2,3,4 | |
| High sensitivity wavelength range (PS) | 800 | 940 | 1000 | nm | |
| Full scale PS counts | 65535 | counts | |||
| LED current (IRDR_LED[2:0]) | 3.125 | 150 | mA | Note 5 | |
| Ambient Light Suppression (AMBSUPP) | TBD | Lux | Note 8 | ||
| ESD protection (HBM) | 2 | kV | |||
| ESD protection (MM) | 200 | V | |||
| Latch Up | 100 | mA |
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