TSL237 Light-to-Frequency

Sidelooker package

Features

5M:1 input dynamic range
Low dark frequency (0.1Hz typical)
High irradiance responsivity 2.3kHz/(µW/cm2) @ λp = 524nm
2X gain lense

Benefits

Detects light intensity at a high resolution
Provides low light level operation
Provides for high sensitivity to detect a small change in light
Provides additional sensitivity advantages

Product parameters

Supply Voltage [V]	2.7-5.5
Responsivity [Hz/µW/cm²]	1200 @ 640
Max. Output Frequency [MHz]	1
Selectable Sensitivity and Full-Scale Output Frequency
Output Frequency Tolerances [+/- %]	20
Temperature Range [°C]	-40 to 85
Packages	S, SM
Remark	Not recommended for new design. Please see Ambient Light Sensors device family.

General Description

The TSL237 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 TSL237 is characterized for operation over the temperature range of −40°C to 85°C and is supplied in a 4-lead ChipLED package (CL) and a compact 4-lead surface-mount package (T).

This product suits for the following applications:

Pulse oximetry
Color sensing
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 1-01	English
	Application Note	Colorimetry Tutorial (DN 20)	English

Notifications

	Type	Description	Language
	EoL Notification	TSL1x_TSL2xx_TSL25xx_TSL4531 (issued 2017-Feb)	English

Other Information

	Type	Description	Language
	Block Diagram	TSL237 Block Diagram	English