AK8999A Datasheet, PDF (40/68 Pages) Asahi Kasei Microsystems – Pressure Sensor Control IC

CONFIDENTIAL
[AK8999A/AW/AD]
7) The Initial State Setup of VOUT pin, DET1 pin and DET2 pin at Power-Up
To make the Pressure Threshold Detectors generate the correct result at power up, the initial state of VOUT pin,
and the output polarity and the detection direction of the Pressure Threshold Detectors must be set by
EEPROM (EVOUT[1:0], EINV1[0], EIN1L[0], EINV2[0], EIN2L[0]).
The relation between the data in EEPROM and the output waveform of VOUT pin, DET1 pin and DET2 pin is
explained in the following figures.
7.1) Detection Conditions: EIN1L[0]=EIN2L[0]=EINV1[0]=0h, EINV2[0]=1h, EVOUT[1:0]=0h
VDD
VDD
VOUT pin
Detection threshold
VOUT pin
Detection threshold
unknown
VOUT state (VDD 1V)
VSS
DET1 pin
Low
Normal output
unknown
VOUT state (VDD 1V)
VSS
High
DET2 pin
High
Normal output
Low
unknown
DET1 state (VDD 1V)
Initial state
Detection result
unknown
DET2 state ^{(VDD 1V)}
Initial state
Detection result
7.2) Detection Conditions: EIN1L[0]=EIN2L[0]=1h, EINV1[0]=0h, EINV2[0]=1h, EVOUT[1:0]=1h
VDD
VDD
VOUT pin
Detection threshold VOUT pin
Detection threshold
VOUT state
unknown
(VDD 1V)
VDD
Normal output
VOUT state
unknown
(VDD 1V)
VDD
Normal output
DET1 pin
Low
DET2 pin
High
DET1 state
MS1600-E-00
unknown
(VDD 1V)
Initial state
Detection result
DET2 state
unknown
(VDD 1V)
Initial state
- 40 -
Detection result
2014/05