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WM8903 Datasheet(PDF) 127 Page - Wolfson Microelectronics plc

Part # WM8903
Description  Ultra Low Power CODEC for Portable Audio Applications
PDF  178 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8903 Datasheet(HTML) 127 Page - Wolfson Microelectronics plc

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Production Data
WM8903
w
PD, Rev 4.5, June 2012
127
POWER-ON RESET
The WM8903 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 or 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 65 and Figure 66.
DCVDD
Vpord_on
0V
AVDD
0V
Vpora
Vpora_off
LO
HI
Internal POR
Device ready
POR active
POR active
POR undefined
ADDR/GPIO3
LO
HI
tpusetup
tpuhold
Figure 65 Power On Reset timing - AVDD enabled first
Figure 66 Power On Reset timing - DCVDD enabled first



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