[AK4223]
■ System Reset
The RSTN pin must be set to “L” when power up the AK4223. The AK4223 powers up in reset state. The REGV pin
starts outputting (typ. 5.0V) when power is supplied to the device. This reset is released by setting the RSTN pin to “H”.
Figure 12 shows the reset sequence.
Power Supply
(VVDD, AVDD, RVDD)
(1)
VSS
REGV=5.0V(TYP)
REGV pin Output
(2)
RSTN Pin
(3)
Audio⋅Video Circuit
Power down
Audio Output: Hi-Z
Power Up
Notes:
(1) Time that the REGV output reaches 95% of the maximum value. (typ. 800μs, max. 5ms)
(2) Reset Time (min. 150ns)
(3) Time to be in a normal operation after reset release. (Video Output: typ. 100ms, Audio Output: typ. 170ms)
*The required time to be in a normal operation of audio outputs is proportional to the capacity of an external capacitor
at the VCOM pin. This typical value 170ms is for when the external capacitor is 1.0μF.
Figure 12 System Reset Diagram
MS1251-E-00
16
2010/10
AKM [ ASAHI KASEI MICROSYSTEMS ]
