YAS525B.pdf 데이터시트 (총 8 페이지) - 파일 다운로드 YAS525B 데이타시트 다운로드

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YAS525B
MS-1C
Magnetic field Sensor
„ Overview
YAS525B is the biaxial geomagnetic sensor IC integrating a high sensitivity biaxial magnetic sensor, a
buffer amplifier, an AD converter (ADC), a clock generator, and serial data interface (supports I2C bus) on
one chip.
YAS525B allows you to make up a high sensitive, compact and low-power electronic compass in a portable
GPS system or a mobile phone.
„ Features
A manufacturing process that makes magnetic sensor on a Si wafer with high precision realizes
integration with peripheral circuits.
High sensitive geomagnetic sensor IC is realized by integrating a magnetic sensor and a low noise buffer
amplifier.
High noise immunity is improved by digitizing output from geomagnetic sensor IC.
External interface supports I2C bus (100kbps/400kbps, slave mode).
Geomagnetic sensor with superior high board density and low-power consumption.
Automatic power-down control mode is available after measurements.
Others.
Manufacturing process .......................... CMOS + Magnetic Sensor
Package ................................................. Lead-free 8-ball WLCSP Package (YAS525B-WZ)
Power supply voltage ............................ 2.5 3.3V
Operating temperature .......................... -20 +85°C
Power consumption during operation ... 10mW (VDD=3.0Vwhen magnetic field is measured.)
Magnetic sensor section
Measuring magnetic field range ... ±300µT
Resolution ..................................... 0.6µT/count
Measuring time ..................................... within 10ms/magnetic sensor mono-axial measurement
YAS525B CATALOG
CATALOG No.: LSI-BAS525B21
2007.6

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YAS525B
„ Pin Description
Here is a figure for pin assignment and a table for pin descriptions.
35
4
26
8
17
53
4
62
8
71
8Pin WLCSP Top View
8Pin WLCSP Bottom View
Pin Descriptions
Pin No. Name I/O
Function
1 T2
I+ Test input
(Use in non-connection)
2 VSS
- Ground
3 T1
I+ Test mode
(Use in non-connection)
4 SCL
Is Serial Clock
5 NC
- Non-connection
6 VDD
- Power supply (typ 3V)
7 NC
- Non-connection
8 SDA Is/Od Serial data
Note: Pin 1 and pin 3 are used in non-connection.
Pin 5 is connected to pin 7 in the chip.
I+ : Input with pull-up resistor
Is : Schmitt trigger input
Od : Open drain output
„ Pin Functions
z Power Supply (VDD, VSS)
These pins are for power supply of YAS525B.
z Serial Data Interface (SCL, SDA)
SCL Serial clock input pin.
This pin is used with an external pull-up register.
SDA Serial data input/output pin.
This pin is used with an external pull-up register.
z Others (T1, T2)
T1 Test mode control pin.
Use this pin in non-connection.
T2 Test input pin.
Use this pin in non-connection.
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YAS525B
„ Block Diagram
Here is the internal block diagram of YAS525B.
X-axis
Magnetic
Sensor
Initialization
Coils
Y-axis
Magnetic
Sensor
Thermal
Sensor
Buffer
Amplifier
A/D
Converter
Clock
Generator
T1 T2
Power-down
Controller
Serial
Data
Interface
(Registers)
Power-on
Reset
Circuit
Block Diagram
VDD
SCL
SDA
VSS
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YAS525B
„ Function Descriptions
z Analog Circuit Section
Magnetic Sensor
A sensor for X-axis and Y-axis is embedded independently.
(As for sensitivity direction of X-axis and Y-axis, see the following figure.)
Y-axis
X-axis
Chip alignment and X,Y-axis
Buffer Amplifier
The amplifier amplifies a signal from the magnetic sensor output.
Thermal Sensor
The sensor is a thermal sensor for the compensation of temperature characteristics of the
magnetic sensor.
A/D Converter (ADC)
The ADC converts magnetic sensor output and temperature sensor output into digital data.
Clock Generator
The clock generation section supplies clocks for ADC and digital circuits.
Power-on Reset
The section detects a rising of the power–on and initializes circuits.
Initialization Coil
The coil is used when the magnetic sensor cannot give original characteristics due to receiving
strong magnetic field.
Generating magnetic field by the initialization coil initializes the magnetic sensor
characteristics.
The initialization coil is operated by setting Config register CONFR [3:0].
z Digital Circuit Section
Serial Data Interface
YAS525B serial data interface supports I2C serial interface and operates in the slave mode.
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YAS525B
„ Example of System Configuration
Here is an example of system configuration.
3V
GND
VDD
SCL
YAS525
VSS
SDA
T1
T2
Host
CPU
(I2C master)
I2C Device
I2C Device
Example of system configuration
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