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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.
2

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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
3