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參數(shù)資料
| 型號： | AK7716VT |
| 英文描述： | Consumer IC |
| 中文描述： | 消費性IC |
| 文件頁數(shù)： | 31/60頁 |
| 文件大小： | 1171K |
| 代理商： | AK7716VT |
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[ASAHI KASEI]
[AK7716]
<M0057-E-01>
1999/09
- 31 -
(3) Power supply startup sequence
Turn on the power by setting to INIT RESET = "L", DSP RESET = "L" and CODEC RESET = "L".
Then the AK7716 is initialized by setting to INIT RESET = "H". Note 1)
Initialization by INIT RESET is sufficient if it is done only when the power is turned on.
VREF become operating state and VCOM value rises to AVDD/2. The stable time depends on external capacitor.
The setting CODEC RESET to ”H” should be after VCOM value is stabled to AVDD/2.
(In case of using 0.1uF and 10uF capacitors, it takes about 100msec.)
Normally, INIT_RESET setting is only done at turn on power.
Note 1): Set to INIT RESET = "H" after setting the 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 INIT 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.
AVDD, DVB
DVDD
INIT_RESET
CODEC_RESET
DSP_RESET
Fig. Power supply startup sequence
Power OFF
When a crystal oscillator is used,
ensure stable oscillation in this
period.
DSP RESET and CODEC RESET can be
controlled simultaneously during normal use.
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