AK8973 Datasheet, PDF (9/31 Pages) Asahi Kasei Microsystems – 3-axis Electronic Compass

ASAHI KASEI
5.3.2. EEPROM Characteristics
Parameter
EEPROM erase/write cycles
EEPROM data retention
* For write operation, VDD of 2.9V or more is required.
Min.
1000
10 (85°C)
Max.
[AK8973]
Unit
Cycles
Years
5.3.3. Analog Circuit Characteristics
Parameter
Symbol
Condition
Min. Typ. Max. Unit
RSTN rise timing
Time for measurement
ADC resolution
DAC resolution
DAC step width
TRS _{From rising edge of power}
100
ns
source (VDD, VID) until RSTN
rising edge
TSM Sum of Ttm+Thm
(Refer to 6.2.2)
10.0 12.6 15.1
ms
ASR
8
bit
DRS
8
bit
DST VDD=3.0V
124 156 187
μV
DAC accuracy
DAQ VDD=3.0V
±^1/8
LSB
Pre-AMP gain setting range
VDD=3.0V
Lower limit
HASL Gain setting register: 0H
26.3 26.8 27.3
dB
Upper limit
HASH Gain setting register: FH
32.3 32.8 33.3
dB
(Note 6)
Pre-AMP gain step width
AGS
0.25 0.4 0.55
dB
Temperature
sensor ^TOP
-30
85
°^C
measurement range
Temperature sensor output ^TOC VDD=3.0V, Tc=35°C
71H 78H 7FH code
code
Temperature
sensor ^{TSE VDD=3.0V(Note 7)}
-1.4 -1.6 -1.8 LSB/_°C
sensitivity
Magnetic sensor sensitivity ^BSE VDD=2.5V Tc=25°C
420 600 780 LSB
(Note 8)
B=_±300mT, Differential signal
HXGA=HYGA=07H、
HZGA=0AH
(Note 6) Gain setting register of each axis of magnetic sensor. HXGA, HYGA, HZGA.(Refer to 8.3.6.)
(Note 7) Reference value for design
(Note 8) Set the data of EHXGA, EHYGA, EHZGA into HXGA, HYGA, HZGA respectively. The adjustment value
of the pre-AMP gain that becomes 1uT/1LSB is written in low 4bit of EHXGA, EHYGA, and EHZGA.
Higher 4bit of HXGA, HYGA, and HZGA is disregarded even if written. Please copy 8bit data read from
EHXGA, EHYGA, and EHZGA to HXGA, HYGA, and HZGA as it is.
5.4. Detailed Timing
5.4.1. Various Timing
Parameter
Wait time before mode setting
RSTN Pulse Width
EEPROM access mode turn on
time
EEPROM programming time
Symbol
Twat
Trnw
Twr
Condition
Min. Typ. Max. Unit
100
μs
100
ns
300
μs
10
ms
MS0561-E-01 <Preliminary>
-9-
2007/01