AH1894

Micropower Selectable threshold Omnipolar Hall Effect Switch

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Description

The AH1894 is a high sensitivity, magnetic range selectable micropower Omnipolar Hall effect switch IC with internal pull up and pull down capability. Designed for portable and battery powered equipment such as cellular phones and portable PCs to home appliances and industrial applications, the average power consumption is only 8uW at 1.85V. To support portable equipment the AH1894 can operate over the supply range of 1.6V to 3.6V and uses a hibernating clocking system to minimize the power consumption. Based on chopper stabilized architecture and high ESD capability the AH1894 provides a reliable solution over the whole operating range. To minimize PCB space the AH1894 is available in small low profile packages. The single output is activated with either a north or south pole of sufficient magnetic field strength. The user can select one of two magnetic sensitivity bands via the BSEL pin without the addition of any external components allowing a flexible but small solution. The band select can be hardwired or be changed on the fly via a logic source such as a micro-controller. When the magnetic flux density (B) is larger than operate point (Bop), the output will be turned on (pul°C low) and held until B is lower than release point (Brp). The AH1894 is available in a small low profile X1-DFN1216-4 and leaded SOT553 packages

Application(s)

Holster or Cover Detect for Cellular Phones and Tablet PCs

Open and Close Detect for Flip/Slide Cellular Phones

Cover or Display Switch in Low Profile Portable PCs (eg Ultrabooks)

Digital Still, Video Cameras and Handheld Gaming Consoles

Door, Lids and Tray Position Switches

Level, Proximity and Position Switches

Contact-Less Switches in Home Appliances and Industrial Applications

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP)	Standard
AEC Qualified	No
Type	Omnipolar
Outputs	Single
Output Type	Push-Pull
Active Output State (B > Bop)	Low
Inactive Output State (B < Brp)	High
Key Feature	Selectable Sensitivity
Operating Voltage (V)	1.6 to 3.6
Average Supply Current (mA)	0.0043
Min Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss)	25
Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss)	40
Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss)	55
Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss)	20
Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss)	30
Max Release Point Brp (Brps +ve/ Brpn -ve) (Gauss)	45
Operating Ambient Temperature (°C)	-40 to 85

Technical Documents

Recommended Soldering Techniques

TN1.pdf

RoHS CofC

RoHSFile

Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2512	2021-04-16	2021-07-16	Qualified Additional Assembly & Test (A/T) Site