TSL238T Light-to-Frequency
High-sensitivity converter low profile 4-pin package
Features
- 850K:1 input dynamic range
- Low dark frequency (0.6Hz typical)
- 2.6mm x 3.8mm 4-lead SMD (T) package
Benefits
- Detects light intensity at a high resolution
- Provides low light level operation
- Reduces board space requirements while simplifying designs
Product parameters
| Supply Voltage [V] | 2.7-5.5 |
|---|---|
| Responsivity [Hz/µW/cm²] | 3400 @ 640 |
| Max. Output Frequency [MHz] | 1 |
| Selectable Sensitivity and Full-Scale Output Frequency | |
| Output Frequency Tolerances [+/- %] | 20 |
| Temperature Range [°C] | -40 to 85 |
| Package | T |
| Remark | Not recommended for new design. Please see Ambient Light Sensors device family. |
General description
The TSL238T light-to-frequency converter combines a silicon photodiode and a current-to-frequency converter on a single monolithic CMOS integrated circuit. Output is a square wave (50% duty cycle) with frequency directly proportional to light intensity (irradiance) on the photodiode. The digital output allows direct interface to a microcontroller or other logic circuitry. Output enable (OE) places the output in a high-impedance state for multiple-unit sharing of a microcontroller input line. The device has been temperature compensated for the ultraviolet-to-visible light range of 320 nm to 700 nm and responds over the light range of 320 nm to 1050 nm. The TSL238T is characterized for operation over the temperature range of −40°C to 85°C and is supplied in a compact 4-lead surface-mount package that is lead (Pb) free and RoHS compliant.
ams-OSRAM AG is discontinuing production of this device. Final lifetime buy order must be placed by OCTOBER 15, 2021. Please contact your local sales representative for further information regarding available or planned replacement options.
This product suits for the following applications:
- Pulse oximetry
- Turbidity sensing
- Optical switch
Tools
| Title | Category | Headline | Buy |
|---|---|---|---|
| Light-to-FrequencyEvalKit | Application Board | Evaluation Kit for Light-to-Frequency Sensors |
Technical documents
| Type | Description | Language | ||
|---|---|---|---|---|
| Datasheet | Document version 1-00 | English | ||
| Application Note | Colorimetry Tutorial (DN 20) | English | ||
| Application Note | Basic Pre-Production Light & Color Sensor Solution Validation Process | English |
Notifications
| Type | Description | Language | ||
|---|---|---|---|---|
| EoL Notification | Plano Test Site (issued May-20-2021) | English |
Other information
| Type | Description | Language | ||
|---|---|---|---|---|
| Block Diagram | TSL238T Block Diagram | English |
Related boards
Evaluation Kit for Light-to-Frequency Sensors
Light-to-FrequencyEvalKit
