Document
A1454
3V Hall Effect Linear Sensor with I2C Output
FEATURES AND BENEFITS
• 1 mm thin (TSSOP-08) package • 2 factory programmed sensitivity options: 2 LSB/G (for
fields up to ±1000 G) and 4 LSB/G (±500 G) • Temperature-stable sensitivity for NdFeB and ferrite
magnets • I2C interface for easy integration with support for up to
127 unique addresses • EEPROM stores factory programmed settings and up to
16 bytes of user information (programmable through the I2C interface) • Micro-power sleep mode through I2C command for minimizing power in battery-operated applications • Precise recoverability after temperature cycling • Wide ambient temperature range: –40°C to 125°C • 12-bit ADC with 10-bit ENOB (Effective Number of Bits)
Package: 8-Pin TSSOP (suffix LE)
Not to scale
DESCRIPTION
TheA1454 linear Hall effect sensor IC provides a 12-bit digital output word that is proportional to the strength of the magnetic field that is present. Its quiescent output value is at mid-scale, and it comes in 2 different factory programmed sensitivity ranges: 2LSB/G & 4LSB/G. The sensitivity temperature coefficient is also factory programmed to support either Neodymium or Ferrite magnets. The A1454 incorporates an I2C interface for easy integration into a wide variety of applications. The I2C address can either be set by external resistors or programmed via EEPROM, to support up to 127 unique I2C addresses, allowing for multiple ICs on the same bus. It also includes 16 bytes of user programmable EEPROM.
TheA1454 I2C interface provides a user-controlled sleep input command that puts the device in micro-power mode, which reduces the current consumption of theA1454. This low power feature makes theA1454 perfect for portable, battery-operated applications.
The BiCMOS monolithic process allows the integration of both high precision analog and high-density digital circuitry. The A1454 integrates the Hall element, a 12-bit ADC, gain & offset compensation circuitry, EEPROM memory and the I2C interface on a single monolithic IC that is packaged in a space saving surface mount package.
Engineering samples are available on a limited basis. Contact your sales or applications support office for additional information.
VCC
Sleep Mode
I2C Serial
SDA
Interface
SCL
Hall Element
ADC
Digital Controller
EEPROM Memory
Charge Pump
Slave Address
ADC
ADR0 ADR1
GND
Functional Block Diagram
I2C Master
VCC VCC
VCC
10 kΩ
10 kΩ
VCC VA1
SCL VCC
VCC
0.1 µF
SDA ADR0
A1454
ADR1
GND
VA0
NC NC
Typical Application Circuit
A1454-DS
A1454
3V Hall Effect Linear Sensor with I2C Output
Selection Guide
Part Number
Sensitivity
A1454KLETR-2F-T
2 LSB/G
A1454KLETR-4F-T
4 LSB/G
A1454KLETR-2N-T
2 LSB/G
A1454KLETR-4N-T
4 LSB/G
*Contact Allegro™ for additional packing options.
SPECIFICATIONS
Target Magnet Ferrite Ferrite
Neodymium Neodymium
Packing
Package
4000 pieces per reel 8-Pin TSSOP Package
Absolute Maximum Ratings
Characteristic
Symbol
Notes
Rating
U.