WM8351CGEB/RV WOLFSON [Wolfson Microelectronics plc], WM8351CGEB/RV Datasheet - Page 151
![no-image](/images/no-image-200.jpg)
WM8351CGEB/RV
Manufacturer Part Number
WM8351CGEB/RV
Description
Manufacturer
WOLFSON [Wolfson Microelectronics plc]
Datasheet
1.WM8351CGEBRV.pdf
(330 pages)
- Current page: 151 of 330
- Download datasheet (4Mb)
Production Data
17 POWER SUPPLY CONTROL
17.1 GENERAL DESCRIPTION
w
The WM8351 can take its power supply from a Wall adaptor, a USB interface or from a single-cell
lithium battery. The WM8351 autonomously chooses the most appropriate power source available,
and supports hot-swapping between sources (ie. the system can remain in operation while different
sources are connected and disconnected).
Comparators within the WM8351 identify which power supplies are available and select the power
source in the following order of preference:
Note that the Wall supply is always the first choice of supply, (providing that it is within required
limits), even if the Wall supply voltage is lower than the USB voltage.
When Wall or USB is selected as the power source, this may be used to charge the Battery, using the
integrated battery charger circuit. For battery charging to occur, the USB or LINE supply voltage must
be no less than 4.0V.
Figure 74 illustrates the WM8351 connections associated with the WALL, USB and Battery supplies.
Figure 74 WM8351 Power Supply Connections
The Wall Adaptor supply connects to LINE via a FET switch as illustrated in Figure 74. The FET
switch is necessary in order to provide isolation between the Wall supply and the Battery/USB
supplies; this is vital in the event of the USB voltage being greater than the Wall supply voltage.
The Wall Adapter voltage is sensed directly on the WALL_FB pin; this allows the WM8351 to
determine the preferred supply, including when the FET is switched off.
The gate connection to the external FET is controlled by LINE_SW, which is an alternate function that
can be enabled on GPIO12 (see Section 20). Note that, if the USB connection is not used, then the
FET may not be required and the Wall supply may be connected directly to LINE.
LINE is primarily an output from the WM8351; this output is the preferred supply, where the WM8351
has arbitrated between the Wall, Battery and USB connections. This output is suitable for supplying
power to the other blocks of the WM8351, including the DC-DC Converters and LDO Regulators.
LINE is also an input under some conditions, such as battery charging from Wall or providing power
at the USB connection.
Wall adaptor (LINE pins)
USB power rail (USB pins)
Battery (BATT pins)
PD, April 2012, Rev 4.5
WM8351
151
Related parts for WM8351CGEB/RV
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![WM9701A](/images/no-image3.png)
Part Number:
Description:
WM9701ALow Power AC97 Multimedia Audio Codec
Manufacturer:
WOLFSON Wolfson Microelectronics plc
Datasheet:
![WM8973LGEFL](/images/no-image3.png)
Part Number:
Description:
WM8973LGEFLSTEREO CODEC FOR PORTABLE AUDIO APPLICATIONS
Manufacturer:
WOLFSON Wolfson Microelectronics plc
Datasheet:
![wm8350](/images/no-image3.png)
Part Number:
Description:
Wolfson Audioplus? Stereo Codec With Power Management
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
![wm8351](/images/no-image3.png)
Part Number:
Description:
Wolfson Audioplus? Stereo Codec With Power Management
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
![wm8352](/images/no-image3.png)
Part Number:
Description:
Wolfson Audioplus? Stereo Codec With Power Management
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
![wm2000](/images/no-image3.png)
Part Number:
Description:
Handset Receiver Speaker Driver With Wolfson Myzone Ambient Noise Cancellation
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
![wm2002](/images/no-image3.png)
Part Number:
Description:
Stereo Headphone Driver With Wolfson Myzonetm Ambient Noise Cancellation
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
![wm8400](/images/no-image3.png)
Part Number:
Description:
Wolfson Audioplustm Hi-fi Audio Codec And Power Management Unit For Mobile Multimedia
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
![WM8941GEFL](/images/no-image3.png)
Part Number:
Description:
Mono CODEC with Speaker Driver and Video Buffer
Manufacturer:
WOLFSON [Wolfson Microelectronics plc]
Datasheet:
![WM8951L_07](/images/no-image3.png)
Part Number:
Description:
Stereo ADC with Microphone Input and Clock Generator
Manufacturer:
WOLFSON [Wolfson Microelectronics plc]
Datasheet:
![WM9701A](/images/no-image3.png)
Part Number:
Description:
WM9701ALow Power AC97 Multimedia Audio Codec
Manufacturer:
WOLFSON Wolfson Microelectronics plc
Datasheet:
![WM8973LGEFL](/images/no-image3.png)
Part Number:
Description:
WM8973LGEFLSTEREO CODEC FOR PORTABLE AUDIO APPLICATIONS
Manufacturer:
WOLFSON Wolfson Microelectronics plc
Datasheet:
![WM9711](/images/no-image3.png)
Part Number:
Description:
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
![WM9705](/images/no-image3.png)
Part Number:
Description:
Manufacturer:
Wolfson Microelectronics plc
Datasheet:
![WM9707](/images/no-image3.png)
Part Number:
Description:
Manufacturer:
Wolfson Microelectronics plc
Datasheet: