A1454 Datasheet, PDF (1/15 Pages) Allegro MicroSystems – 3V Hall Effect Linear Sensor with I2C Output

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
The A1454 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.
The A1454 I²C interface provides a user-controlled sleep input
command that puts the device in micro-power mode, which
reduces the current consumption of the A1454. This low power
feature makes the A1454 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
ADC
Hall
Element
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
V_A1
SCL
VCC
VCC
0.1 µF
SDA
ADR0
V_A0
A1454
ADR1
GND
NC
NC
Typical Application Circuit
A1454-DS