參數(shù)資料
型號(hào)： AK2307LV
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： SPEECH CODEC for Digital Key telephone (5.0V/3.3V)
中文描述： 語(yǔ)音編解碼器的數(shù)字按鍵電話（5.0V/3.3V）
文件頁(yè)數(shù)： 26/39頁(yè)
文件大小： 468K
代理商： AK2307LV
ASAHI KASEI [AK2307/LV]
5. Power on Reset
Power on Reset
AK2307/LV automatically generates the internal reset pulse which resets all the circuit that is necessary to start the
initialization after the power on reset. The CPU registers are set to the default value.
After the internal reset pulse is generated, CODEC starts the initialization procedure by being fed FS signal, and it takes
150ms(typ.), 330ms(max) to complete the initialization after the detection of power on.
Power up slope to enable the Power-on Reset
When the power-up slope is no longer than 50ms(=5tau:tau is time constant), Power On Reset works normally.
When the time is longer than 50ms, Power On Reset may not be activated and no internal regist ers are initialized. In
this case all registers must be written through CPU interface.
NOTE) For the stable operation after power up, we recommend to write all register value through CPU interface in any
case after the power up.
Recommended start up procedure
The following start up procedure is recommended when AK2307/LV is going to power up.
Power up
- BCLK=”L”
During this stage, FS and BCLK must be tied to
“L” not to receive or transmit the data from/to the
external devices.
Wait 200ms
*In case of VDD rising time
=50ms(=5tau)
MS0190-E-05
2005/12
26
Write data to the internal
register through serial I/F
Supply FS and BCLK
- FS=”L”
- Write data to the internal register
before CODEC starts working.
- CODEC Initialization starts.
Wait 250ms (min:130ms)
- CODEC Initialization complete.
CODEC starts working
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