AK8999AD Datasheet, PDF (38/68 Pages) Asahi Kasei Microsystems – Pressure Sensor Control IC

CONFIDENTIAL
[AK8999A/AW/AD]
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
6.8
VDD:5.5V
9.5
Description
Reference value
for design
5) Pressure Threshold Detectors 1 and 2
5.1) Pressure Threshold Detector's Detection Threshold
The internal and external detection threshold setup for the pressure threshold detectors 1 and 2 is
described.
Block diagram of the pressure threshold 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 threshold detector 1 can be set either through the external input
(DET/PTH pin) or internal setup (EEPROM setup EPT1[4:0]). The detection threshold of the pressure
threshold detector 2 can be only set the internal setup (EEPROM setup EPT2[4:0]).
5.2) Pressure Threshold Detector's hysteresis voltage
The relation between the hysteresis voltage and the detection voltage of the pressure threshold
detectors 1 and 2 is described
The hysteresis voltage related with the detection threshold voltage of the pressure threshold detectors 1
and 2 is as follows by the detection threshold setup (EEPROM setup EIN1L[0], EIN2L[0]).
Detect pressure above threshold : Detection threshold – Hysteresis voltage
Detect pressure below threshold : Detection threshold + Hysteresis voltage
In addition, same as the detection threshold of the pressure threshold detectors 1 and 2, the setting range of
“Detection threshold ± Hysteresis voltage” should be set between from 0.125*VDD to 0.9*VDD.
MS1600-E-00
- 38 -
2014/05