Allegro® 推出带有锁存数字输出的全新超灵敏霍尔效应开关，采用全极磁驱动。该产品可在低电源电流和低电源电压下运行，非常适合于电池驱动电子产品。低运行电源电压（1.65 V 至 3.5 V） 和独特的时钟算法，帮助降低平均运行能耗。例如，电源为 2.75 v 时，能耗低于 15 mW 。
与许多霍尔效应开关不同，只要存在强度足够大的北极或南极磁场，便可令输出开关关闭或打开。此外，Allegro A1172 采用四引脚晶圆级芯片尺寸封装，提供两组推挽输出。这两组输出的配置，是用于当缺少足够的磁场时，一路输出关闭，而别一路输出则在不存在磁场时打开。
不受磁极影响和最低的功率要求，允许 A1172 轻松更换簧片开关，提供更高的可靠性且便于制造，从而降低对信号调节的要求。
Allegro A1172 器件面向消费市场，采用四引脚晶圆级芯片尺寸封装 (CG)。
A1172
Micropower Ultra-Sensitive Hall-Effect Switch
Features
- Micropower operation
- Operation with either north or south pole — no magnetic orientation required during assembly
- 1.65 to 3.5 V battery operation
- Chopper stabilization
- Superior temperature stability
- Extremely low switchpoint drift
- Insensitive to physical stress
- Solid state reliability
- Small size: WLCSP (≈ 1 mm × 1 mm × 0.5 mm)
- Complementary, push-pull outputs eliminate need for pull-up resistor
Description
The A1172 is an ultra-sensitive, pole-independent Hall-effect switch with a latched digital output. It features operation at low supply currents and voltages, making it ideal for battery-operated electronics. The 1.65 to 3.5 V operating supply voltage and unique clocking algorithm reduce the average operating power requirements to less than 15 µW with a 2.75 V supply.
The A1172 has two push-pull output structures. Omnipolar activation for the output function is available on each output structure. As such, either a north or south pole of sufficient strength turns the available outputs off or on. The A1172 contains two complementary outputs. Therefore, for a fixed magnetic field, one output will be in a high voltage state and one output will be in a low voltage state.
Improved stability is made possible through dynamic offset cancellation using chopper stabilization, which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. This device includes, on a single silicon chip, a Hall-voltage generator, a smallsignal amplifier, chopper stabilization, a latch, and a MOSFET output.
The A1172 device offers magnetically optimized solutions, suitable for most applications. The wafer level chip scale package (WLCSP) is approximately only 1 mm by 1 mm by 0.5 mm. This package is smaller than most plastic packages and reduces the printed circuit board area consumed by micropower Hall-effect switches.
