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| YAS526C MS-2 Magnetic field Sensor Overview YAS526C is the Triaxial Geomagnetic Sensor IC integrating high sensitivity triaxial Magnetic Sensors, A/D inputs for inclination sensors, temperature sensor for inclination sensor temperature characteristics correction, Buffer Amplifiers, A/D Converters, Clock Generators, and Serial Data Interfaces (supports I2C) on a multi-chip package. YAS526C 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 Si wafer with high precision realizes integration with peripheral circuits on one chip. High sensitive geomagnetic sensor IC is realized by integrating magnetic sensors and low noise amplifiers. Three A/D input pins for inclination sensor 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 geomagnetic measurements. Temperature sensor for inclination sensor temperature characteristics correction Others. Manufacturing process .................................. CMOS + Magnetic Sensor Package ......................................................... Lead-free 28-pin QFN package (YAS526C-QZ) Supply voltage for Core ................................ 2.5 V to 3.6 V Supply voltage for Interface .......................... 1.7 V to VDD Operating temperature ................................... -20 to +85 C Power consumption during operation. Magnetic field measurement ................. 27 mW (VDD = 3.0 V) Inclination sensor A/D conversion ........ 6 mW (VDD = 3.0 V) Magnetic sensor section Measuring magnetic field range ........... 300 T Resolution ............................................. 0.6 T/count (X,Y), 1.2 T/count (Z) A/D input section Input range ............................................ 0.5 V to 2.5 V Resolution ............................................. 3.0 mV Measuring time Magnetic sensor measurement .............. within 8 ms (Three axes collective measurement) Inclination sensor A/D .......................... within 4 ms (per 1 channel) YAS526C CATALOG CATALOG No.: LSI-BAS526C20 2007.6 YAS526C Pin Description Here is a figure for pin assignment and a table for pin descriptions. 28 Pin QFN Top View Pin Descriptions Pin No. 1 2 3 6 7 8 14 15 16 18 19 20 21 22 Pin Name I1 I2 I3 VSS1 IOVDD1 SCL1 SDA1 VDD1 T1 VSS2 T2 IOVDD2 SCL2 SDA2 I/O A A A I I/Od I I I I/Od A/D input 1 A/D input 2 A/D input 3 Ground Power supply for Interface Serial clock Serial data Power supply for Core Test mode (connecting with VDD) Ground Test mode (connecting with VDD) Power supply for interface Serial clock Serial data Function 28 VDD2 Power supply for Core Note) Connection of I3(A/D input 3) pin to VDD is recommended when using YAS526C with a biaxial inclination sensor connected. Connecting I1, I2, and I3 to VSS is recommended when an inclination sensor is not connected. Pin 16 and pin 19 are used, connecting with VDD. When used, no connection should be made to the pins (4, 5, 9, 10, 11, 12, 13, 17, 23, 24, 25, 26, 27) except the above. A I Od : Analog input : Digital Input : Open drain output 2 YAS526C Pin Functions Power Supply (VDD1, VDD2, IOVDD1, IOVDD2, VSS1, VSS2) These pins are for power supply of YAS526C. VDD1, VDD2 IOVDD1, IOVDD2 VSS1, VSS2 - Power Supply for Core - Power Supply for the Interface - Ground Serial Data Interface (SCL1, SCL2, SDA1, SDA2) SCL1, SCL2 SDA1, SDA2 Serial clock input pin. These pins are used with an external pull-up register. Serial data input/output pin. These pins are used with an external pull-up register. Analog Input I1, I2, I3 - A/D input pin Connection of I3 pin to VDD is recommended when using YAS526C with a biaxial inclination sensor connected. Connecting I1, I2, and I3 to VSS is recommended when an inclination sensor is not connected. Others (T1, T2) T1, T2 Test mode control pin. Normally, these pins are used, connecting with VDD 3 YAS526C Block Diagram Here is the internal block diagram of YAS526C. T1 Magnetic Sensor - 1 Initialization Coils Magnetic Sensor - 2 gain XY-chip Powerdown Control Serial Data Clock Generator Interface (Resisters) Power on Reset VDD1 IOVDD1 SCL1 SDA1 A/D VSS1 Magnetic Sensor - 3 Initialization Coils Temperature Sensor Z-chip gain A/D Powerdown Control Serial Data Interface VDD2 IOVDD2 SCL2 SDA2 Clock Generator (Resisters) Power on Reset T2 Block Diagram VSS2 I1 I2 I3 4 YAS526C Function Descriptions Analog Circuit Section Magnetic Sensor YAS526C includes three Magnetic Sensors. Only the sensor of an axis to measure at the time of magnetic field measurement is operated. Buffer Amplifier The buffer amplifier amplifies a signal output from the bridge of magnetic sensor. The amplifier operates only when magnetic field measurement is made. Temperature Sensor The temperature sensor is a sensor using band gap and in Z chip. The sensor operates only when temperature is measured. A/D Converter (ADC) The integrating A/D converter (ADC) using switched capacitor is mounted on YAS526C. XY chip and Z chip has one each. The ADC of XY chip has Magnetic field Rough Offset Measurement and Magnetic field Normal Measurement modes. The ADC of Z chip has Temperature Measurement and External Input Measurement modes in addition to Magnetic field Rough Offset Measurement and Magnetic field Normal Measurement modes. The ADC operates only when measurement is performed. Analog External Input A/D The A/D measures values from analog external input. Input range is from 0.5 to 2.5V. One count of A/D converter is about 3.0mV. Clock Generator The clock generator supplies clocks for ADC and digital circuits. The generator operates only when the measurements is made. Power-on Reset The Power-on Reset circuit detects a rising of supply voltage for the core and initializes circuits. Initialization Coil The coils are used when the magnetic sensor cannot give original characteristics due to receiving high magnetic field. Generating magnetic field by the initialization coils initializes the magnetic sensor characteristics. 5 YAS526C Digital Circuit Section Serial Data Interface YAS526C serial data interface supports I2C serial interface and operates in the slave mode. SCL (SCL1, SCL2) : Serial clock input pin SDA (SDA1, SDA2) : Serial data input/output pin Communication is performed through the above pins. 6 YAS526C Example of System Configuration Here is an example of system configuration. IOVDD1 VSS1 VDD1 T1 VSS2 T2 IOVDD2 SCL2 Example of system configuration I3 I2 I1 7 YAS526C Package Outline Drawing Notice : Do not expose wirings of the mount board within a square area (1.8 mm on a side) centering around the center of the chip. Since a part of the lead frame is exposed on the package, if the wiring short-circuits to the exposed part, malfunctions may occur. 8 YAS526C YAS526C |
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