1.Si-monolithic 3-axis geomagnetic sensor LSI
2.Measurement range
- ± 2000 microT
3.Functions
- Time-sharing sequencer controls automatic measurement of 3-axis magnetism and temperature
- 8-bit DAC for rough compensation of offset magnetism
- Built-in 8-bit ADC
- 8-bit digital output (12-bit equivalent resolution achieved by combination of DAC and ADC)
- Individual adjustment data, already stored before shipment at AKM, such as sensitivity of sensor
- I2C serial interface (separated from main power supply, low voltage is acceptable)
- Interrupt function for measurement data ready
- No clock input required (built-in oscillator)
- Automatic power-down function
4.Operating temperature range: -30°C to +85°C
5.Operating supply voltage range: VDD = +2.5V to +3.6V, VID = +1.7V to VDD
6.Low current consumption/measurement time
- 3-axis magnetism measurement: 6.8 mA / 12.6 ms
- Power-down: 0.2 microA (typ.)
- 100 ms readout cycle: 0.83 mA (ave.)
7.Package
- AK8973N: 16-pin QFN (4.0 4.0 0.75 mm)
- AK8973B: 15-pin WL-CSP, BGA (2.5 2.5 0.9 mm)
- AK8973S: 15-pin WL-CSP, LGA (2.5 2.5 0.5 mm)
(Note) QFN is recommended for normal applications, because WL-CSPs need advanced mounting technology.
Features:
1.3-axis geomagnetic measurement by one-chip LSI has become possible by Si-monolithic Hall elements and by unique technology for magnetic concentrator.
2.The combination of high-level technology of analogue signal operation and original digital estimation technology has achieved geomagnetic detection by Hall elements that had been thought impossible in the past.
3.By using excellent linearity and wide dynamic range of Hall elements, very wide measurement range such as ± 2000 microT is provieded.
4.Due to the built-in DAC for compensating the offset magnetic field generated by such as speakers, the position restraint with parts which generate the offset magnetic field is reduced, and the degree of freedom about layout is expanded.
5.Due to the built-in 8-bit ADC and serial interface, X-, Y-, and Z-axes components of geomagnetism can be output as digital signal.
6.The serial interface corresponds to the I2C bus.
7.A dedicated power supply is used for the serial interface, so the low-voltage operation at down to 1.7V is also covered.
8.A memory for storing the individual adjustment values of sensor sensitivity is built-in. The adjustment values are stored before shipment at AKM factory.
9.The built-in temperature sensor generates the digital A/D-converted data and then the data is output from serial interface as digital data.
10.The major circuit blocks of AK8973N/B/S are activated by the measurement request command from the controller, and transit to the power-down mode automatically at the end of measurement. That characteristic realizes the low power consumption required for mobile phones.
11.The interrupt function for posting the completion of sensor signal measurement to the external CPU is built-in.
12.Built-in oscillator dispenses with the external clock input.
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AK8973B.pdf
