描述：
a3212的集成电路是一种超灵敏,极点独立霍尔效应开关锁存数字输出. 这种传感器,尤其适合运行在电池操作,手持设备如蜂窝,无绳电话,传呼机,和掌上电脑. 2.5伏特至3.5伏特的操作和独特的超频计划降低平均营运电力需求较少超过15µW的2.75伏特的供应.
不像其他霍尔效应开关,无论是南北极足够的实力将输出;在没有磁场时,输出关闭. 极性独立性和小功率要求,让这些设备能轻易取代簧片开关优良的可靠性和缓解制造业,同时消除要求信号调理.
改进的稳定性是可以通过斩波稳定(动态抵消取消),减少残余失调电压通常会造成设备overmolding,依赖温度和热应力.
这种装置包括在单一晶片的霍尔电压发生器,小信号放大器,斩波稳定,锁存器,和MOSFET输出. 先进的BiCMOS处理是用于利用低电压和低功耗的要求,部件匹配,非常低的输入偏置误差,和小构件几何.
四风格包装磁提供优化解决大多数应用. 迷你低调表面摩包类型高血压和El(0.75和0.50毫米的高度象征),无铅,LH的是含铅低调SMD型,及UA是一个为期导致SIP的通孔安装. 每个包现已有铅(Pb)的版本(后缀-T)与100%电镀锡引线. 厄尔尼诺包装有限释放,工程样本资料.

A3211 and A3212
Micropower, Ultrasensitive Hall-Effect Switches

Features

• Micropower operation
• Operate with north or south pole
• 2.5 to 3.5 V battery operation
• Chopper stabilized
  • Superior temperature stability
  • Extremely low switch-point drift
  • Insensitive to physical stress
• Solid-state reliability
• Small size
• Easily manufacturable with magnet pole independence

Description

The A3211 and A3212 integrated circuits are ultrasensitive, pole independent Hall-effect switches with latched digital output. These devices are especially suited for operation in battery-operated, hand-held equipment such as cellular and cordless telephones, pagers, and palmtop computers. A 2.5 to 3.5 V operation and a unique clocking scheme reduce the average operating power requirements to less than 15 µW with a 2.75 V supply.

Unlike other Hall-effect switches, either a northorsouth pole of sufficient strength will turn the output on in the A3212, and in the absence of a magnetic field, the output is off. The A3211 provides an inverted output. The polarity independence and minimal power requirements allow these devices to easily replace reed switches for superior reliability and ease of manufacturing, while eliminating the requirement for signal conditioning.

Improved stability is made possible through chopper stabilization (dynamic offset cancellation), 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, small-signal amplifier, chopper stabilization, a latch, and a MOSFET output. Advanced CMOS processing is used to take advantage of low-voltage and low-power requirements, component matching, very low input-offset errors, and small component geometries.

Four package styles provide magnetically optimized solutions for most applications. Miniature low-profile surface-mount package types EH and EL (0.75 and 0.50 mm nominal height) are leadless, LH is a 3-pin low-profile SMD, and UA is a three-pin SIP for through-hole mounting. Packages are lead (Pb) free (suffix, –T) with 100% matte tin plated leadframes.

完整型号:

A3212EEHLT-T  封装：6-lead MLP

A3212EELLT-T  封装：3-lead MLP

A3212ELHLT-T  封装：3-lead SOT

A3212EUA-T    封装：3-pin SIP