AK8996 Datasheet, PDF (46/74 Pages) Asahi Kasei Microsystems – Pressure Sensor Interface IC

[AK8996/W]
8) Pressure Detector's Detection Threshold
Information about the setup of the pressure detector's detection threshold and the setup range of the
detection threshold based on the mode setup is summarized.
Block diagram of the pressure detector:
E INT2 [ 0]
0.5*VDD<
PTH
+ side
Threshold
comparator
EEPROM
: EPT[3:0]
-1
- side
0.5*VDD>
comparator
VOUT
LOGIC
EI NT3 [1 :0 ]
DET
The pressure detector's detection threshold can be set up, as shown in the block diagram, either
through the external input (PTH pin) or internal setup (EEPROM setup EPT[3:0]). Selecting the
external input or internal setup can be performed using the EEPROM (EINT2[0]).
As shown in the block diagram, the pressure detector's detection threshold is limited by the setup
range depending on the mode setup. Setup range limitations are summarized here; use care when
using the pressure detector.
EINT3 [1:0]
00
01
10
11
Symbol
INT<
INT>
INT><
INT<>
Mode setup
Detect pressure above
threshold
Detect pressure below
threshold
Detect pressure either
above or below threshold
Detect pressure within a
certain range
Detection threshold setup range
0.5*VDD~0.95*VDD @VDD: 5V
0.05*VDD~0.5*VDD @VDD: 5V
~(0.5*VDD~0.95*VDD),
(0.05*VDD~0.5*VDD)~ @VDD: 5V
(0.5*VDD~0.95*VDD)
~(0.05*VDD~0.5*VDD) @VDD: 5V
For example, if EINT3[1:0]: 0hex is set, the detection threshold range is, as shown in the table,
0.5*VDD to 0.95*VDD @VDD: 5V. This means that setup below 0.5*VDD cannot be achieved, so due
consideration must be given when using it.
MS1055-E-02
46
2011/12