[ASAHI KASEI]
[AK7740ET]
(3) Power supply startup sequence
Turn on the power by setting INIT_RESET = “L” and S_RESET = “L”. This sets up VREF (analog reference
level). Then initizlize the control registers by setting INIT_RESET = “H”.
Note 1) Only set INIT_RESET during power-up.
Note 1): Set INIT_RESET = "H" after starting oscillation when a crystal oscillator is used.
This setting time may differ depending on the crystal oscillator and its external circuit.
NOTE: Do not stop the system clock (slave mode: XTI, LRCLK, BITCLK, master mode: XTI) except when
S_RESET = "L". If these clock signals are not supplied, excess current will flow due to dynamic logic that is
used internally, and an operation failure may result.
Do not set S_RESET = "H" during INIT_RESET = "L". This will stop the oscillator or cause it to be unstable.
AVDD
DVDD
INIT_RESET
S_RESET
When a crystal oscillator is
used, ensure stable
oscillation in this period.
Power OF
Power supply startup sequence
<Pre-E-01>
- 24 -
2006/10
AKM [ ASAHI KASEI MICROSYSTEMS ]
