Using low power CMOS process, the CST5981C is designed for low power, high performance omnipolar detection hall-effect application, such as cover switch, contactless switch, solid state switch and lid close sensor etc battery operation. The hall IC integrated an on-chip hall voltage generator for magnetic sensing, a comparator that amplifiers the hall voltage, a Chopper amplifier, a Schmitt trigger to provide switching hysteresis for noise rejection,and a complementary output.

    The total power consumption of CST5981C is typically less than 1.8uA at 1.8V power supply. CST5981C is designed to respond to alternating North and South poles. When the magnetic flux density (B) is larger than operate point (BOP),the output will be turned on (low), the output is held until the magnetic flux density (B) is lower than release point (BRP), then turn off (high).

    The device is available in SOT553, SSOT23-3L,SOT23-3L and SIP3L Packages and is rated over the -40°C to 85°C. The all packages are RoHS and Green compliant.

    CST5981C采用低功耗CMOS工艺，适用于低功耗、高性能的全向霍尔效应检测应用，如盖子开关、非接触式开关、固态开关和盖子关闭传感器等电池操作。霍尔集成电路集成了一个用于磁感应的片上霍尔电压发生器、一个放大霍尔电压的比较器、一个斩波放大器、一个为噪声抑制提供开关滞后的施密特触发器以及一个互补输出。

    CST5981C的总功耗通常在1.8V电源下小于1.8uA。CST5981C设计用于响应南北极交替。当磁通密度（B）大于操作点（BOP）时，输出将开启（低），保持输出直到磁通密度（B）低于释放点（BRP），然后关闭（高）。

    该设备有SOT553、SSOT23-3L、SOT23-3L和SIP3L封装，额定温度超过-40°C至85°C。所有包装均符合RoHS和绿色标准。

CST5981C Features/特性：

Input Voltage Range : 1.65V to 5.5V

Micro-power consumption ideal for battery power applications

Omniplar Operation, easy to use as output

Very high sensitivity hall sensor

Low Power CMOS process technology

Chopper stabilization amplifier stage

Magnetic Sensitivity (typical) BOP=±30Gauss, BRP=±20Gauss

Good RF noise immunity

No need pull-up resistor

Small Solution Size

RoHS & Green Compliant

SOT553, SSOT23-3L, SOT23-3L & SIP3L Packages

-40℃ to +85 ℃ Temperature Range

CST5981C Applications/应用：

Cover switch in clam-shell cellular phones

Cover switch in Notebook, PC/PAD

Contact-less switch in consumer products

Solid State Switch

Handheld Wireless Handset Awake Switch

Lid close sensor for battery-powered devise

Magnet proximity sensor for reed switch replacement in low duty cycle applications

DV, DSC, and White Goods

CST5981C Ordering Information/订购信息：

Part Number	BOP(Gauss)	BRP Gauss)	Package Type	Package Qty	Temperature	Eco Plan
CST5981CWRN	±30Gauss	±20Gauss	SOT553	7-in reel 3000pcs/reel	-40～85℃	Green
CST5981CSTRN	±30Gauss	±20Gauss	SOT23-3L	7-in reel 3000pcs/reel	-40～85℃	Green
CST5981CS2RN	±30Gauss	±20Gauss	SSOT23-3L	7-in reel 3000pcs/reel	-40～85℃	Green
CST5981CMRN	±30Gauss	±20Gauss	SIP-3L	1000pcs/Package	-40～85℃	RoHs