[AK4675]
■ General Purpose Output
The AK4675 has General Purpose Output Pin (GPO) to control the external component.
In case of GPOM1 bit = “0”, the GPO1 pin goes to “H” at GPOE1 bit = “1”.
GPOE1 bit
GPO1 pin
0
1
L
H
(default)
Table 109. General Purpose Output 1 Pin Control (GPOM1 bit = “0”)
In the case of GPOM1 bit = “1”, the GPO1 pin goes to “H” if the input level of the channel selected by A0 bit (SAIN1 or
SAIN2 pin) is higher than the reference voltage that is input the SAIN3 pin. In the case of GPOM1 bit = “1”, the reference
voltage input to the SAIN3 pin should be lower than 0.5 x AVDD.
SAIN1/2 pin
< SAIN3 pin
≥ SAIN3 pin
GPO1 pin
L
H
(default)
Table 110. General Purpose Output 1 Pin Control (GPOM1 bit = “1”)
In the case of GPOM2 bit = “0”, the GPO2 pin goes to “H” at GPOE2 bit = “0”.
GPOE2 bit
GPO2 pin
0
1
L
H
(default)
Table 111. General Purpose Output 2 Pin Control (GPOM2 bit = “0”)
In the case of GPOM2 bit = “1”, the GPO2 pin outputs the mic detection result. (Table 21.)
Input Level of MDT pin
GPO2 pin
DTMIC bit
External microphone
Mic (Headset)
No Mic (Headphone)
H
L
1
0
≥ 0.075 x AVDD
< 0.050 x AVDD
Table 21. Microphone Detection Result
MS0963-E-00
2008/05
- 134 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
