Using low power CMOS process, the CST9191 is designed for low power, high performance unipolar 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 CST9191 is typically less than 1.8uA at 3.3V power supply.CST9191 is designed to respond to alternating North pole. When the magnetic flux density (B) is larger than operate point (BOPN), the output will be turned on (low), the output is held until the magnetic flux density (B) is lower than release point (BRPN), then turn off (high).

    The device is available in SIP-3L, SOT553,SSOT23-3L and SOT23-3L Package and is rated over the -40°C to 85°C. The package is RoHS and Green compliant.

    CST9191采用低功耗CMOS工艺，设计用于低功耗、高性能单极检测大厅效应应用，如盖开关、非接触开关、固态开关、盖关闭传感器等电池操作。霍尔集成电路集成了一个用于磁传感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，一个施密特触发器来提供开关滞后的噪声抑制，以及一个互补输出。

    CST9191在3.3V电源条件下的总功耗通常小于1.8uA。CST9191被设计用来应对交替的北极。当磁通密度(B)大于操作点（BOPN）时，输出将打开（低），保持输出，直到磁通密度(B)低于释放点（BRPN），然后关闭（高）。

    该设备可采用SIP-3L、SOT553、SSOT23-3L和SOT23-3L封装，额定功率高于-40°C至85°C。该包装符合RoHS和绿色标准。

CST9191 Features/特性：

Input Voltage Range : 1.65V to 5.5V

Micro-power consumption ideal for battery power applications

Uniplar Operation, easy to use as output

Very high sensitivity hall sensor

Low Power CMOS process technology

Chopper stabilization amplifier stage

Magnetic Sensitivity (typical) BOP=±42Gauss, BRP=±25Gauss

Good RF noise immunity

No need pull-up resistor

Small Solution Size

RoHS & Green Compliant

SIP-3L, SOT23-3L, SSOT23-3L and SOT553 Package

-40℃ to +85 ℃ Temperature Range

CST9191 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

Part Number	BOP(Gauss)	BRP (Gauss)	Package Type	Package Qty	Temperature	Eco Plan
CST9191S2RN	+42	+25	SSOT23-3L	7-in reel 3000pcs/reel	-40～85℃	Green
CST9191WRN	-42	-25	SOT553	7-in reel 3000pcs/reel	-40～85℃	Green

CST9191 Marking & Pin Assignment: