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WM8912GEFL/V Datasheet(PDF) 90 Page - Wolfson Microelectronics plc

Part # WM8912GEFL/V
Description  Ultra Low Power DAC with Headphone Driver for Portable Audio Applications
PDF  128 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8912GEFL/V Datasheet(HTML) 90 Page - Wolfson Microelectronics plc

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WM8912
Production Data
w
PD, Rev 4.0, September 2010
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
Figure 55 Power On Reset Timing - DCVDD Enabled First



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