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Freescale Semiconductor Document Number: MAG3110

Data Sheet: Technical Data Rev. 9.2, 02/2013

An Energy Efficient Solution by Freescale

Xtrinsic MAG3110 Three-Axis, Digital

Magnetometer

Freescale’s MAG3110 is a small, low-power, digital 3-axis magnetometer.

The device can be used in conjunction with a 3-axis accelerometer to realize an

orientation independent electronic compass that can provide accurate heading

information. It features a standard I

C serial interface output and smart embedded

functions.

The MAG3110 is capable of measuring magnetic fields with an output data rate

(ODR) up to 80 Hz; these output data rates correspond to sample intervals from

12.5 ms to several seconds.

The MAG3110 is available in a plastic DFN package and it is guaranteed to

operate over the extended temperature range of -40°C to +85°C.

Features

• 1.95 V to 3.6 V supply voltage (VDD)

• 1.62 V to VDD IO voltage (VDDIO)

• Ultra small 2 mm x 2 mm x 0.85 mm, 0.4 mm pitch, 10-pin package

• Full-scale range ±1000 T

• Sensitivity of 0.10 T

• Noise down to 0.25 T rms

• Output Data Rates (ODR) up to 80 Hz

• 400 kHz Fast Mode compatible I

C interface

• Low-power, single-shot measurement mode

• RoHS compliant

Applications

• Electronic Compass (e-compass)

• Location-Based Services

Ruggedized Target markets

• Smartphones, personal navigation devices, robotics, UAVs, speed sensing, current sensing and wrist watches with

embedded electronic compasses (e-compass) function.

Table 1. Ordering information

Part number

C Address

Package description Shipping

MAG3110FCR1 0x0E DFN-10 Tape and Reel (1000)

FXMS3110CDR1 0x0F DFN-10 Tape and Reel (1000)

10-PIN DFN

2 mm x 2 mm x 0.85 mm

CASE 2154-02

MAG3110

Top and Bottom View

Top View

Pin Connections

Cap-A

VDD

Cap-R

GND

INT1

SDA

VDDIO

SCL

Summary of content (30 pages)

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Freescale Semiconductor Data Sheet: Technical Data Document Number: MAG3110 Rev. 9.2, 02/2013 An Energy Efficient Solution by Freescale Xtrinsic MAG3110 Three-Axis, Digital MAG3110 Magnetometer Freescale’s MAG3110 is a small, low-power, digital 3-axis magnetometer. The device can be used in conjunction with a 3-axis accelerometer to realize an orientation independent electronic compass that can provide accurate heading information.
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Contents 1 2 3 4 5 6 7 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Application circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Operating and Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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1 Block diagram and pin description SDA SCL X-axis Y-axis ADC MUX Digital Signal Processing and Control Z-axis Clock Oscillator Regulator + Reference Trim Logic INT1 VDD VDDIO Figure 1. Block diagram X 1 10 GND Cap-A 1 VDD 2 9 INT1 NC 3 8 VDDIO Cap-R 4 7 SCL GND 5 6 SDA Y Z (TOP VIEW) (TOP VIEW) Figure 2. Pin connections and measurement coordinate system MAG LYW L = WAFER LOT Y = LAST DIGIT OF YEAR W = WORK WEEK Figure 3.
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Table 2. Pin descriptions 1.1 Pin Name Function 1 Cap-A 2 VDD 3 NC 4 Cap-R 5 GND GND 6 SDA I2C Serial Data 7 SCL I2C Serial Clock 8 VDDIO 9 INT1 Interrupt - active high output 10 GND GND Bypass cap for internal regulator Power supply, 1.95 V – 3.6 V Do not connect Magnetic reset pulse circuit capacitor connection Digital interface supply, 1.65 V - VDD Application circuit Device power is supplied through the VDD line.
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2 Operating and Electrical Specifications 2.1 Operating characteristics Table 3. Operating characteristics @ VDD = 2.4 V, VDDIO = 1.8 V, T = 25°C unless otherwise noted. Parameter Test Conditions Full-scale range Symbol Min FS Output data range(1) Typ Max ±1000 -30000 Unit µT +30000 LSB Sensitivity So 0.10 µT/LSB Sensitivity change versus temperature Tcs ±0.
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2.2 Absolute maximum ratings Stresses above those listed as “absolute maximum ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device under these conditions is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Table 4. Maximum ratings Rating Symbol Value Unit VDD -0.3 to +3.6 V Vin -0.3 to VDDIO + 0.
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2.3 Electrical characteristics Table 6. Electrical characteristics @ VDD = 2.4 V, VDDIO = 1.8 V, T = 25°C unless otherwise noted Parameter Test Conditions Supply voltage Interface supply voltage Supply current in ACTIVE mode Symbol Min Typ Max Unit VDD 1.95 2.4 3.6 V VDDIO 1.62 VDD V ODR(1)(2) 80 Hz, OS(1) = 00 900 ODR 40 Hz, OS(3) = 00 550 ODR 20 Hz, OS(3) = 00 275 ODR 10 Hz, OS(3) = 00 ODR 5 Hz, OS(3) = 00 Supply current drain in STANDBY mode 137.5 Idd µA 68.8 ODR 2.
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2.4 I2C Interface characteristics Table 7. I2C slave timing values(1) I2C Fast Mode Parameter Unit Symbol Min Max 0 400 SCL clock frequency Pullup = 1 k Cb = 20 pF fSCL Bus free time between STOP and START condition tBUF 1.3 s Repeated START hold time tHD;STA 0.6 s Repeated START setup time tSU;STA 0.6 s STOP condition setup time tSU;STO 0.6 s SDA data hold time(2) tHD;DAT 0.05(3) SDA valid time(5) kHz (4) s tVD;DAT 0.
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Figure 5. I2C slave timing diagram 2.5 I2C pullup resistor selection The SCL and SDA signals are driven by open-drain buffers and a pullup resistor is required to make the signals rise to the high state. The value of the pullup resistors depends on the system I2C clock rate and the total capacitive load on the I2C bus.
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3 Modes of Operation Table 8. Modes of operation description Mode I2C Bus State STANDBY I2C communication is possible. Only POR and Digital blocks are enabled, the Analog subsystem is disabled. ACTIVE I2C communication is possible. All blocks are enabled (POR, Digital, Analog). 4 Function Description Functionality MAG3110 is a small low-power, digital output, 3-axis linear magnetometer packaged in a 10-pin DFN.
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A low to high transition on the SDA line while the SCL line is high is defined as a stop condition (SP) signal. A write or burst write is always terminated by the master issuing the SP signal. A master should properly terminate a read by not acknowledging a byte at the appropriate time in the protocol. A master may also issue a repeated start signal (SR) during a transfer. The 7-bit I2C slave address assigned to MAG3110 is 0x0E (standard); the address assigned to FXMS3110CD is 0x0F (Windows™ 8). 4.2.
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< Single Byte Read > Master ST Device Address[6:0] W Register Address[7:0] AK Slave SR Device Address[6:0] R AK NAK SP AK Data[7:0] < Multiple Byte Read > Master ST Device Address[6:0] W Register Address[7:0] AK Slave AK Master Data[7:0] R AK AK Data[7:0] Slave SR Device Address[6:0] AK AK NAK Data[7:0] SP Data[7:0] < Multiple Byte Write > Master ST Device Address[6:0] W Register Address[7:0] AK Slave Data[7:0] AK Data[7:0] AK SP AK < Single Byte Write > Mast
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4.2.5 INT1 The DR_STATUS register (see section 5.1.1) contains the ZYXDR bit which denotes the presence of new measurement data on one or more axes. Software polling can be used to detect the transition of the ZYXDR bit from 0 to 1 but, since the ZYXDR bit is also logically connected to the INT1 pin, a more efficient approach is to use INT1 to trigger a software interrupt when new measurement data is available as follows: 1. 2. 3. 4. 5. 4.2.
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4.2.7 MAG3110 Setup Examples Continuous measurements with ODR = 80 Hz, OSR = 1 1. 2. 3. Enable automatic magnetic sensor resets by setting bit AUTO_MRST_EN in CTRL_REG2. (CTRL_REG2 = 0x80) Put MAG3110 in active mode 80 Hz ODR with OSR = 1 by writing 0x01 to CTRL_REG1 (CTRL_REG1 = 0x01) At this point it is possible to sync with MAG3110 utilizing INT1 pin or using polling of the DR_STATUS register as explained in section 4.2.5. Continuous measurements with ODR = 0.63 Hz, OSR = 2 1. 2. 3.
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5 Register Descriptions Table 11.
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5.1 Sensor Status 5.1.1 DR_STATUS (0x00) Data Ready Status This read-only status register provides the acquisition status information on a per-sample basis, and reflects real-time updates to the OUT_X, OUT_Y, and OUT_Z registers. Table 12. DR_STATUS Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ZYXOW ZOW YOW XOW ZYXDR ZDR YDR XDR Table 13. DR_STATUS Descriptions ZYXOW X, Y, Z-axis Data Overwrite. Default value: 0. 0: No data overwrite has occurred.
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5.1.2 OUT_X_MSB (0x01), OUT_X_LSB (0x02), OUT_Y_MSB (0x03), OUT_Y_LSB (0x04), OUT_Z_MSB (0x05), OUT_Z_LSB (0x06) X-axis, Y-axis, and Z-axis 16-bit output sample data of the magnetic field strength expressed as signed 2's complement numbers. When RAW bit is set (CTRL_REG2[RAW] = 1), the output range is between -20,000 to 20,000 bit counts (the combination of the 1000 T full scale range and the zero-flux offset ranging up to 1000 T).
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5.2 Device ID 5.2.1 WHO_AM_I (0x07) Device identification register. This read-only register contains the device identifier which is set to 0xC4. This value is factory programmed. Table 20. WHO_AM_I Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 1 1 0 0 0 1 0 0 5.2.2 SYSMOD (0x08) The read-only system mode register indicates the current device operating mode. Table 21.
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Table 26. OFF_Y_LSB Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 YD6 YD5 YD4 YD3 YD2 YD1 YD0 0 Table 27. OFF_Z_MSB Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ZD14 ZD13 ZD12 ZD11 ZD10 ZD9 ZD8 ZD7 Table 28. OFF_Z_LSB Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ZD6 ZD5 ZD4 ZD3 ZD2 ZD1 ZD0 0 5.4 Temperature 5.4.1 DIE_TEMP (0x0F) The register contains the die temperature in °C expressed as an 8-bit 2's complement number.
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Table 32. Over-Sampling Ratio and Data Rate Description DR2 DR1 DR0 OS1 OS0 Output Rate (Hz) Over Sample Ratio ADC Rate (Hz) Current Typ A Noise Typ T rms 0 0 0 0 0 80.00 16 1280 900.0 0.4 0 0 0 0 1 40.00 32 1280 900.0 0.35 0 0 0 1 0 20.00 64 1280 900.0 0.3 0 0 0 1 1 10.00 128 1280 900.0 0.25 0 0 1 0 0 40.00 16 640 550.0 0.4 0 0 1 0 1 20.00 32 640 550.0 0.35 0 0 1 1 0 10.00 64 640 550.0 0.3 0 0 1 1 1 5.00 128 640 550.
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5.5.2 CTRL_REG2 (0x11) Table 33. CTRL_REG2 Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 AUTO_MRST_EN — RAW Mag_RST — — — — Table 34. CTRL_REG2 Description Automatic Magnetic Sensor Reset. Default value: 0. 0: Automatic magnetic sensor resets disabled. 1: Automatic magnetic sensor resets enabled. AUTO_MRST_EN Similar to Mag_RST, however, the resets occur automatically before each data acquisition. This bit is recommended to be always explicitly enabled by the host application.
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6 Geomagnetic Field Maps The magnitude of the geomagnetic field varies from 25 T in South America to about 60 T over Northern China. The horizontal component of the field varies from zero at the magnetic poles to 40 T. These web sites have further information: http://wdc.kugi.kyoto-u.ac.jp/igrf/ http://geomag.usgs.gov/ MAG3110 22 Sensors Freescale Semiconductor, Inc.
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Geomagnetic Field MAG3110 MAG3110 Sensitivity (0.1 T) Full-Scale Range (1000 T) MAG3110 Sensors Freescale Semiconductor, Inc.
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7 PCB Guidelines Surface mount Printed Circuit Board (PCB) layout is a critical portion of the total design. The footprint for the surface mount packages must be the correct size to ensure proper solder connection interface between the PCB and the package. With the correct footprint, the packages will self-align when subjected to a solder reflow process. These guidelines are for soldering and mounting the Dual Flat No-Lead (DFN) package inertial sensors to PCBs.
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0.200 0.400 0.200 0.225 0.600 0.400 Package Footprint PCB Cu Footprint 0.725 0.550 1.950 0.175 Stencil Opening Solder Mask Opening Figure 7. Footprints and Soldering Masks (dimensions in mm) MAG3110 Sensors Freescale Semiconductor, Inc.
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PACKAGE DIMENSIONS CASE 2154-02 ISSUE A 10-PIN DFN MAG3110 26 Sensors Freescale Semiconductor, Inc.
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PACKAGE DIMENSIONS CASE 2154-02 ISSUE A 10-PIN DFN MAG3110 Sensors Freescale Semiconductor, Inc.
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PACKAGE DIMENSIONS CASE 2154-02 ISSUE A 10-PIN DFN MAG3110 28 Sensors Freescale Semiconductor, Inc.
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Table 35. Revision history Revision number Revision date Description of changes 05/2012 • • • • • • • Updated content on page 1. Updated pin descriptions in Table 1. Updated pin connection drawing and Figure 2 to reflect horizontal bar for pin 1. Added Figure 3, Device Marking Diagram Updated Output Data Range row in Table 2. Updated Figure 4 to include pin names. Updated Bit 7 in Table 31 and 32 for emphasis. Changed description as highlighted in Red and bold text.
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