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WM8904ECS/R bảng dữ liệu(PDF) 133 Page - Wolfson Microelectronics plc

tên linh kiện WM8904ECS/R
Giải thích chi tiết về linh kiện  Ultra Low Power CODEC for Portable Audio Applications
PDF  188 Pages
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nhà sản xuất  WOLFSON [Wolfson Microelectronics plc]
Trang chủ  http://www.wolfsonmicro.com
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WM8904ECS/R bảng dữ liệu(HTML) 133 Page - Wolfson Microelectronics plc

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Pre-Production
WM8904
w
PP, Rev 3.3, September 2012
133
POWER-ON RESET
The WM8904 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 69 and Figure 70.
DCVDD
Vpord_on
0V
AVDD
0V
Vpora
Vpora_off
LO
HI
Internal POR
Device ready
POR active
POR active
POR undefined
Figure 69 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 70 Power On Reset timing - DCVDD enabled first



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