AK8998 Datasheet, PDF (34/59 Pages) Asahi Kasei Microsystems – Preliminary

[AK8998/W/D]
4) Power Consumption
Current values described in 3) Supply Voltage Current in the Electrical Characteristics are those for
the average current. The maximum current is shown in the table below. Use a power supply with
sufficient supply capacity by referring to this table:
Max. Current
units
mA
VDD:3.6V
5.5
VDD:5.5V
7.5
Comments
Reference value
for design
5) Pressure Detectors 1 and 2
5-1) Pressure Detector's Detection Threshold
The internal setup and external setup for the pressure detectors' (1 and 2) detection threshold is
described.
Block diagram of the pressure detectors 1 and 2:
EPTH1[0]
Threshold EEPROM
：EPT1[3:0]
DET1/2
Control
Threshold EEPROM
：EPT2[3:0]
VOUT
LOGIC
EIN1L[1:0]
EIN2L[1:0]
EPTH1[0]
DET1
DET2/
PTH
The detection threshold of the pressure detectors 1 and 2 can be set up, as shown in the block
diagram. For the pressure detectors 1 either through the external input (DET/PTH pin) or
internal setup (EEPROM setup EPT1[4:0]) is used, for the pressure detector 2 only the internal
setup (EEPROM setup EPT2[4:0]) is used.
5-2) Pressure Detector's hysteresis voltage
The hysteresis voltage in the pressure detectors' (1 and 2) detection threshold is described.
The hysteresis voltage to the detection threshold of the pressure detectors 1 and 2 is as follows by
the detection threshold setup (Detect pressure above or below threshold).
Detect pressure above threshold: Detection threshold – Hysteresis voltage
Detect pressure below threshold: Detection threshold + Hysteresis voltage
In addition, the setting range of “Detection threshold ± hysteresis voltage” should be set between
from 0.125*VDD to 0.9*VDD (same setting range as the detection threshold of the pressure
detector).
MSxxxxx-E-00
- 33 -
2012/11