AK8975 Просмотр технического описания (PDF) - Asahi Kasei Microdevices

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производитель

AK8975

3-axis Electronic Compass

Asahi Kasei Microdevices 

[AK8975/C]

4.1. Block Diagram

4. Circuit Configuration

3-axis

Hall

sen sor

MUX

Chopper

SW

Pre-

AMP

Integrator＆ADC

Magnetic source

HE -Driv e

Voltage

Reference

OSC1

Timin g

Control

CAD0

CAD1 TST1 TST2 RSV

TST6

POR

VSS VDD VID

Interface,

Logic

& Register

FUSE ROM

SCL/SK

SDA/SI

CSB

SO

DRDY

4.2. Block Function

Block

Function

3-axis Hall sensor Monolithic Hall elements.

MUX

Multiplexer for selecting Hall elements.

Chopper SW

Performs chopping.

HE-Drive

Magnetic sensor drive circuit for constant-current driving of sensor

Pre-AMP

Variable-gain differential amplifier used to amplify the magnetic sensor signal.

Integrator & ADC Integrates and amplifies pre-AMP output and performs analog-to-digital

conversion.

OSC1

Generates an operating clock for sensor measurement.

6.144MHz(typ.)

POR

Power On Reset circuit. Generates reset signal on rising edge of VDD.

Interface Logic

Exchanges data with an external CPU.

DRDY pin indicates sensor measurement end and data is ready to be read.

I2C bus interface using two pins, namely, SCL and SDA. Standard mode and Fast

mode are supported. The low-voltage specification can be supported by applying

1.65V to the VID pin.

4-wire SPI is also supported by SK, SI, SO and CSB pins.

4-wire SPI works in VID pin voltage down to 1.65V, too.

Timing Control

Generates a timing signal required for internal operation from a clock generated

by the OSC1.

Magnetic Source Generates magnetic field for self test of magnetic sensor.

FUSE ROM

Fuse for adjustment

MS1187-E-02

-5-

2010/05

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