Diodes Inc. has unveiled three new Hall-effect switches that operate from a low supply voltage and at extremely low quiescent current to extend battery lifetime in mobile and portable devices. Used to detect the open/closed status of covers and cases for portable electronics, the AH1899A/B/S devices offer proximity detection in digital cameras and handheld gaming consoles, as well as general contactless switching.
(Source: Diodes Inc.)
Key specs include a supply-voltage range of 1.1 V to 2.0 V and a power-efficient architecture with an average operating current as low as 0.95 µA at 1.2 V. The devices also feature a hibernating clocking system to maximize system energy savings.
The omnipolar switches operate with either north or south magnetic poles close to the package surface. Using an advanced chopper-stabilized topology, the operating (BOP) and release (BRP) points display minimal drift with supply voltage and temperature, the company said. Two sensitivity grades are available to meet specific application requirements for switch response.
The AH1899B and AH1899S switches operate when the magnetic field strength (B) exceeds 30 Gauss and release at below 20 Gauss, while the AH1899A offers high sensitivity and operates at 18 Gauss and releases at 12 Gauss. All versions remain off when no field strength is present.
The AH1899A, AH1899B and AH1899S are currently in production and are priced from $0.11 in quantities of 5,000. The Hall-effect switches are housed in X2-DFN1010-4 (Type B) surface-mount packages, measuring 1.0 × 1.0 mm and 0.4-mm high. The internal circuitry integrates pull-up and pull-down resistors to save PCB area. The sensors are included in the Hall-effect sensor part selector.
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