New TSSP4056 Fast Proximity Sensor Eliminates DACs to Lower Costs in Robotics, Toys, and Other Systems
Product Benefits:
- 56 kHz carrier frequency
- Monotonic sensitivity vs. frequency response curve from 30 kHz to 54 kHz
- High sensitivity of 0.4 mW/m2
- Fast readings in under 5 ms
- Proximity sensing up to 2 m
- Compact molded package measures 6.0 mm by 6.95 mm by 5.6 mm
- Supply voltage range from 2.5 V to 5.5 V
- Typical supply current of 0.7 mA
- Insensitive to supply voltage and ripple noise
- Provides shielding against EMI
- RoHS-compliant, halogen-free, and Vishay Green
Market Applications:
- Proximity sensor for toys, drones, autonomous robots, and intelligent vicinity switches
- Reflective sensor for hand dryers, towel or soap dispensers, water faucets, and toilets; vending machine fall detection; and security.
The News:
Vishay Intertechnology introduces a new infrared (IR) sensor designed to provide fast, low-cost proximity sensing in a variety of systems. The Vishay Semiconductors TSSP4056 is the industry’s first fixed-gain sensor containing a band-pass filter tuned to 56 kHz to feature a monotonic sensitivity vs. frequency response curve from 30 kHz to 54 kHz. The device detects modulated pulses from a separate IR emitter with a high sensitivity of 0.4 mW/m2, while fast readings in under 5 ms are possible using successive approximation techniques as demonstrated in Vishay’s Fast Proximity Sensor software.
- > 4x dynamic range from lowest to highest sensitivity
- Features a PIN photodiode and sensor IC in a single package to simplify designs
- Designed to receive IR pulses from an emitter with a peak wavelength of 940nm
The Perspective:
Typically, proximity sensors determine an object’s distance by varying the emitter’s drive current to find the threshold emitter power at which the object is just detected, a technique that requires an expensive DAC to drive the emitter. The TSSP4056, however, determines distance by varying the carrier frequency used to drive the emitter between 30 kHz and 54 kHz, thereby finding the threshold frequency at which the sensor just detects the object. This approach doesn’t require the microcontroller to contain a DAC, thus lowering overall solution costs. More information on the operating principle behind the TSSP4056 can be found in the application note “Vishay’s TSSP4056 Sensor for Fast Proximity Sensing.”
The Key Specifications:
- Carrier frequency: 56 kHz
- Minimum irradiance: 0.4 mW/m2
- Proximity sensing range: 10 cm to 2 m
- Supply voltage range: 2.5 V to 5.5 V
- Typical supply current: 0.7 mA
Availability:
Samples and production quantities of the proximity sensor are available now, with lead times of four weeks.
To access the product datasheet on the Vishay Website, go to
http://www.vishay.com/ppg?82458 (TSSP40..)
