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PDF AK09916 Data sheet ( Hoja de datos )
| Número de pieza | AK09916 | |
| Descripción | 3-axis Electronic Compass | |
| Fabricantes | AKM | |
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[AK09916]
AK09916
3-axis Electronic Compass
1. General Description
AK09916 is 3-axis electronic compass IC with high sensitive Hall sensor technology.
Small package of AK09916 incorporates magnetic sensors for detecting terrestrial magnetism in the X-axis,
Y-axis, and Z-axis, a sensor driving circuit, signal amplifier chain, and an arithmetic circuit for processing
the signal from each sensor. Self-test function is also incorporated. From its compact foot print and thin
package feature, it is suitable for map heading up purpose in Smart phone to realize pedestrian navigation
function.
2. Features
Functions:
3-axis magnetometer device suitable for compass application
Built-in A to D Converter for magnetometer data out
16-bit data out for each 3-axis magnetic component
Sensitivity: 0.15 µT/LSB (typ.)
Serial interface
I2C bus interface
Standard and Fast modes compliant with Philips I2C specification Ver.2.1
Operation mode
Power-down, Single measurement, Continuous measurement and Self-test
DRDY function for measurement data ready
Magnetic sensor overflow monitor function
Built-in oscillator for internal clock source
Power on Reset circuit
Self-test function with internal magnetic source
Built-in magnetic sensitivity adjustment circuit
Operating temperatures:
-30˚C to +85˚C
Operating supply voltage:
+1.65V to +1.95V
Current consumption:
Power-down:
1 µA (typ.)
Measurement:
Average current consumption at 100 Hz repetition rate: 1.1mA (typ.)
Package:
AK09916C 5-pin WL-CSP (BGA):
1.2 mm 0.8 mm 0.5mm
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[AK09916]
8. Electrical Characteristics
The following conditions apply unless otherwise noted:
Vdd = 1.65V to 1.95V, Temperature range = -30˚C to +85˚C.
8.1. DC Characteristics
Parameter
Symbol
High level input voltage VIH
Low level input voltage VIL
Input current
IIN
Hysteresis input voltage
(Note 1)
Low level output voltage
(Note 2)
Current consumption
(Note 3)
VHS
VOL
IDD1
IDD2
IDD3
Pin
SCL
SDA
SCL
SDA
SCL
SDA
SCL
SDA
SDA
VDD
Condition
VIN = Vss or Vdd
Min. Typ.
70%Vdd
Max.
Unit
V
-0.3 30%Vdd V
-10 +10 µA
10%Vdd
V
IOL ≤ +3mA
20%Vdd V
Power-down mode
Vdd = 1.95V
When magnetic sensor
is driven
Self-test mode
1 3 µA
1.5 3 mA
2.5 4 mA
(Note 1)
(Note 2)
(Note 3)
Schmitt trigger input (reference value for design)
Output is Open-drain. Connect a pull-up resistor externally. Maximum capacitive load: 400pF
(Capacitive load of each bus line for I2C bus interface).
Without any resistance load. It does not include the current consumed by external loads
(pull-down resister, etc.). SDA = SCL = Vdd or 0V.
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[AK09916]
9.4.3. Continuous Measurement Mode 1, 2, 3 and 4
When Continuous measurement mode 1 (MODE[4:0] bits = “00010”), 2 (MODE[4:0] bits = “00100”), 3
(MODE[4:0] bits = “00110”) or 4 (MODE[4:0] bits = “01000”) is set, magnetic sensor measurement is
started periodically at 10 Hz, 20 Hz, 50 Hz or 100 Hz respectively. After magnetic sensor measurement and
signal processing is finished, measurement magnetic data is stored to measurement data registers (HXL to
HZH) and all circuits except for the minimum circuit required for counting cycle length are turned off (PD).
When the next measurement timing comes, AK09916 wakes up automatically from PD and starts
measurement again.
Continuous measurement mode ends when Power-down mode (MODE[4:0] bits = “00000”) is set. It repeats
measurement until Power-down mode is set.
When Continuous measurement mode 1 (MODE[4:0] bits = “00010”), 2 (MODE[4:0] bits = “00100”), 3
(MODE[4:0] bits = “00110”) or 4 (MODE[4:0] bits = “01000”) is set again while AK09916 is already in
Continuous measurement mode, a new measurement starts. ST1, ST2 and measurement data registers (HXL
to TMPS) will not be initialized by this.
(N-1)th
PD
Nth
Measurement
PD
10Hz,20Hz,50Hz or 100Hz
(N+1)th
Measurement
PD
Figure 9.4. Continuous measurement mode
9.4.3.1. Data Ready
When measurement data is stored and ready to be read, DRDY bit in ST1 register turns to “1”. This is called
“Data Ready”. When measurement is performed correctly, AK09916 becomes Data Ready on transition to
PD after measurement.
9.4.3.2. Normal Read Sequence
(1) Check Data Ready or not by polling DRDY bit of ST1 register
DRDY: Shows Data Ready or not. Not when “0”, Data Ready when “1”.
DOR: Shows if any data has been skipped before the current data or not. There are no skipped
data when “0”, there are skipped data when “1”.
(2) Read measurement data
When any of measurement data register (HXL to TMPS) or ST2 register is read, AK09916 judges
that data reading is started. When data reading is started, DRDY bit and DOR bit turns to “0”.
(3) Read ST2 register (required)
HOFL: Shows if magnetic sensor is overflowed or not. “0” means not overflowed, “1” means
overflowed.
When ST2 register is read, AK09916 judges that data reading is finished. Stored measurement data is
protected during data reading and data is not updated. By reading ST2 register, this protection is
released. It is required to read ST2 register after data reading.
(N-1)th Nth
PD Measurement
(N+1)th
PD Measurement
PD
Measurement Data Register
(N-1)th
Nth
(N+1)th
DRDY
Data read
015007392-E-02
ST1 Data(N)
ST2
ST1 Data(N+1) ST2
Figure 9.5. Normal read sequence
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2015/12
11 Page | ||
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