Seiko Instruments Introduces Photo Detect ICs with Zero Power Consumption

Seiko Instruments (SII) has introduced a new series of photo detect ICs featuring zero power consumption (nW class). When combined with photovoltaic devices, they can be used for designing dark/light detection switch circuits. The S-5470 series ICs are based on CMOS technology.

The ICs consume a low power of 0.1 nA (typ.) at a supply voltage of 5.5 V and can function within a wide operating voltage range of 0.9 V - 5.5 V. These ICs feature a small SOT-23-5 package measuring 2.9x2.8x1.3 mm.

When exposed to light, LEDs and photodiodes generate a tiny electric current due to photo voltaic effect. In order to sense this tiny current, amplifiers are required by conventional ICs. For operation, they require a considerable amount of current. The SII's new S-5470 series ICs utilize special low-power CMOS technology that allows detection of such minute currents without any amplifiers. This has allowed the designing of shading detection switches that function based on the differences in illumination that exists between photo voltaic devices.

The SII's S-5470 series ICs can be used as a non-contact switching in various applications such as a wireless mouse that switches on when grasped and switches off when the hand is taken off. It can be used for automatic lighting that detects light/dark conditions and switches on the power if necessary. The ICs can be used in smartphones to activate them when users open its cover. These ICs can be used for similar applications.

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