Infrared Sensor IC
Recently the number of applications that use human presence sensors have increased, such as among IoT equipment. However, pyroelectric type sensors are hard to detect objects through glass. This was causing design constraints in the products. Asahi Kasei Electronics Corporation, (AKM), has developed the AK9752, a human presence sensor for short range applications, (detection distance about 1m). It is capable of detection through glass and suitable sophisticated designed Portable PCs and home information products.
The AK9752 integrates AKM’s original InSb quantum IR sensor element, an analog front end circuit that converts current output of the element into voltage, a dedicated thermometer to measure the element temperature, a 16-bit A/D converter (ADC), an I2C interface and an interrupt output.
The pyroelectric type sensors cannot detect objects through glass. AKM’s previous product, the AK9750 shuts out infrared rays under 5μm wavelength that are able to pass through glass. The AK9752 can detect objects through glass since it’s able to detect infrared wavelengths of 5μm or less with high sensitivity, achieving a detection distance of 1m with a glass thickness of 0.7mm or less. It’s capable of detecting humans through glass and is ideal for home information devices such as a glass top device without having design compromises.
The AK9752 does not need a lens to work up to 1m detection distances. It is housed in a very compact and thin package, providing flexible designability of information terminal devices.
Package: 6-pin SON (2.2 x 2.2 x t0.6 mm)
[Notes] * According to AKM as of January 1st, 2017
The AK9752 can measure the temperature of IR sensor element.
The AK9752 achieves low power consumption. (Power supply: Typ. 1.8 V, Power consumption: Max. 100μA @ 10Hz Output). An interrupt function also helps sustain low power consumption operation with an external microcontroller. It enables long-time operation with a battery driven system.
AK9752AEInfrared Sensors (Human sensing)
|Number of IR Sensor||1||4|
|Optical filter||―||On chip|
|Spectral sensitivity||[μm]||2 to 7||5 to 7|
|Effective detection range||[m]||< 1||< 1|
|16-bit A/D converter||On chip|
|Interrupt pin||Open drain||On chip|
|Built-in Thermometer||Range of -30 to 85℃ are available on I2C bus||Range of -10 to 60℃ are available on I2C bus|
|Supply Voltage||[V]||1.65 to 1.95||1.71 to 3.63|
|Current consumption||[uA]||max 100uA (10Hz Output)||Max.100μA (10Hz Output) |
Max.1μA (Power down)
|Temperature Range||[℃]||-35 to 85|
|Package||6-pin SON||10-pin SON|
|Size||(D/W/H) [mm]||2.2 x 2.2 x 0.6||3.8 x 4.6 x 1.19|
|Main applications||Human approach detection then Device Activation||Seat/Detach Detection, People counting|
|Status||In Mass Production from Apr. 2017||In Mass Production|