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PDF AK8975 Data sheet ( Hoja de datos )
| Número de pieza | AK8975 | |
| Descripción | 3-axis Electronic Compass | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AK8975 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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[AK8975/C]
AK8975/AK8975C
3-axis Electronic Compass
1. Features
A 3-axis electronic compass IC with high sensitive Hall sensor technology.
Best adapted to pedestrian city navigation use for cell phone and other portable appliance.
Functions:
• 3-axis magnetometer device suitable for compass application
• Built-in A to D Converter for magnetometer data out
• 13 bit data out for each 3 axis magnetic components
- Sensitivity: 0.3 µT / LSB typ.
• Serial interface
- I2C bus interface.
Standard mode and Fast mode compliant with Philips I2C specification Ver.2.1
- 4-wire SPI
• Operation mode:
Power-down mode, Single Measurement mode, Self test mode and Fuse access mode.
• DRDY function for measurement data ready
• Magnetic sensor overflow monitor function
• Built-in oscillator for internal clock source
• Power on Reset circuit
• Self test function with built-in internal magnetic source
Operating temperatures:
• -30°C to +85°C
Operating supply voltage:
• Analog power supply
+2.4V to +3.6V
• Digital Interface supply
+1.65V to analog power supply voltage.
Current consumption:
• Power-down:
10 µA max.
• Measurement:
- Average power consumption at 8 Hz repetition rate: 350 µA typ.
Package:
AK8975 16-pin QFN package:
AK8975C 14-pin WL-CSP (BGA):
4.0 mm × 4.0 mm × 0.75 mm
2.0 mm × 2.0 mm × 0.6 mm
MS1187-E-02
-1-
2010/05
1 page  
[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
5 Page 
[AK8975/C]
6. Functional Explanation
6.1. Power States
When VDD and VID are turned on from Vdd=OFF (0V) and Vid=OFF (0V), all registers in AK8975/C are
initialized by POR circuit and AK8975/C transits to Power-down mode.
All the states in the table below can be set, although the transition from state 2 to state 3 and the transition from
state 3 to state 2 are prohibited.
States VDD
1 OFF (0V)
2 OFF (0V)
3 2.4V to 3.6V
4 2.4V to 3.6V
VID
OFF (0V)
1.65V to 3.6V
OFF (0V)
1.65V to Vdd
Power states
OFF (0V).
SCL, SDA should be fixed to the voltage that does
not exceed 3.6V. Other digital pins should be fixed
to L(0V).
OFF (0V). It doesn’t affect external interface.
OFF (0V). It consumes current same as
Power-down mode.
SCL, SDA should be fixed to the voltage that does
not exceed 3.6V. Other digital pins should be fixed
to L (0V).
ON
Table 6.1
6.2. Reset Functions
AK8975/C has two types of reset;
(1) Power on reset (POR)
When Vdd reaches approximately 2V (reference value for design), POR circuit operates, and AK8975/C
is reset.
(2) VID monitor
When Vid is turned OFF (0V), AK8975/C is reset.
When AK8975/C is reset, all registers are initialized and AK8975/C transits to Power-down mode.
MS1187-E-02
- 11 -
2010/05
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK8975.PDF ] | |
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