ROHM’s Complete Line of Hall Effect IC Switches Offers Industry’s Smallest Packages, Lowest Standby Current

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Gaining traction in switching applications, ROHM’s high-performance Hall Effect sensors provide an effective alternative to mechanical switches, offering increased reliability, lower power consumption and other cost/performance advantages in a range of portable electronics applications.

 

 

Demands for extended battery operation, greater reliability and increased features are driving the design of mobile phones, notebook computers, video cameras, navigation systems and game controllers to use smaller, higher-performance components. In response, ROHM’s ultra-small Hall Effect IC switches are ideally suited for a range of switch applications, providing a highly sensitive, single-chip solution (Figure 1) that offers magnetic field, as well as positional, detection. ROHM’s contactless method prevents damage/degradation due to the introduction of foreign materials and lowers wear and tear, enhancing end device value by increasing reliability and extending service life.

ROHM’s Hall Effect IC switches offer the industry’s smallest chip-scale BGA package, measuring just 1.1mm² with a package height of just 0.5mm. A slightly larger surface-mount package, measuring 1.6 x 1.6 x 0.6mm, is also available. This mechanical advantage, combined with the industry’s lowest average current (as low as 3.5µA), fully-integrated compensation and push-pull CMOS logic output circuitry, makes ROHM’s Hall Effect ICs the ideal alternative to mechanical switches and competitive Hall Effect devices.

In operation, ROHM’s integrated dynamic-offset-cancellation technique yields high sensitivity to allow less precise placement of the permanent magnet. The devices’ integrated CMOS output eliminates the need for external pull-up resistors. In addition, the devices are rated at 8kV ESD withstand and -40ºC to +85ºC operation, both important reliability considerations in portable consumer electronics.

As shown in Figure 2, ROHM’s Hall Effect IC product family currently offers four common switch output configurations, including:

1. Unipolar, Detection - switch can be specified to switch on in the presence of either an S-Pole or N-Pole magnetic field of sufficient strength. The output switches off when the magnetic field is removed. Commonly used in jack-knife or slide-open style cell phones to detect the open state, power consumption is reduced through intermittent sensing with typical response times of 5ms. Most competitive devices are available with S-Pole-sensing only.

2. Omnipolar Detection - similar to unipolar operation but provides two Hall plates that can be switched on with a sufficiently strong North or South pole field. The output switches off when the field is removed. Used in similar applications as unipolar switches, but without the magnet polarity requirement.

3. Polarity-Discriminating - similar to omnipolar operation but provides separate outputs that are switched based upon detection of a North or South pole. Output(s) switches off when the field is removed. These switch types are used in rotating screen devices to detect both open position and orientation.

4. Bipolar (Latching) - switches on and off, respectively, with S-Pole and N-Pole fields of sufficient strength. The output will not change if the magnetic field is removed. Used in jog wheel and track ball applications to detect changes in menu selection, these switches offer the extremely fast response time (0.5ms) and high sensitivity (Bop / Brp = 3.0 / -3.0 mT) required for this application.

 

 

Other Fine ROHM Products for Portable Electronics

In addition to Hall Effect IC switches, ROHM offers an extensive portfolio of products to fill many other "sockets" in portable electronics applications. For an overview of ROHM’s product portfolio, application by application, please visit www.rohm.com/products/application/index.html.

 

 

 

For more information on Rohm's Hall ICs, please click here.

 

 Featured Products

Part Number		Description	Data Sheet	App. Notes
BU52001GUL-E2		Bipolar Detection Hall IC, Ultra Compact CSP4 Package
BU52002GUL-E2		Unipolar Detection Hall IC, Ultra Compact CSP4 Package
BU52003GUL-E2		Unipolar Detection Hall IC, Ultra Compact CSP4 Package
BU52004GUL-E2		Bipolar Detection Hall IC with Polarity Discrimination Output
BU52011HFV-TR		Bipolar Detection Hall IC, Ultra Small Outline Package HVSOF5
BU52012HFV-TR		Unipolar Detection Hall IC, Small Outline Package
BU52013HFV-TR		Unipolar Detection Hall IC, Small Outline Package
BU52014HFV-TR		Bipolar Detection Hall IC with Polarity Discrimination Output
BU52015GUL-E2		Bipolar Detection Hall IC, Ultra Compact CSP4 Package
BU52040HFV-TR		Bipolar Detection Hall IC with Polarity Discrimination Output

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