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WM8912 데이터시트(PDF) 90 Page - Cirrus Logic

부품명 WM8912
상세설명  Ultra Low Power DAC with Headphone Driver
PDF  129 Pages
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제조업체  CIRRUS [Cirrus Logic]
홈페이지  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8912 데이터시트(HTML) 90 Page - Cirrus Logic

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WM8912
Production Data
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PD, Rev 4.1, February 2013
90
POWER-ON RESET
The WM8912 includes an internal Power-On-Reset (POR) circuit, which is used to reset the digital
logic into a default state after power up. The POR circuit is powered from AVDD and monitors
DCVDD. The internal POR
¯¯¯ signal is asserted low when AVDD and DCVDD are below minimum
thresholds.
The specific behaviour of the circuit will vary, depending on the relative timing of the supply voltages.
Typical scenarios are illustrated in Figure 54 and Figure 55.
DCVDD
Vpord_on
0V
AVDD
0V
Vpora
Vpora_off
LO
HI
Internal POR
Device ready
POR active
POR active
POR undefined
Figure 54 Power On Reset Timing - AVDD Enabled First
DCVDD
0V
AVDD
0V
Vpora
Vpord_off
LO
HI
Internal POR
Device ready
Vpora_on
POR active
POR active
POR undefined
Figure 55 Power On Reset Timing - DCVDD Enabled First



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