Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

Preview PDF HTML

WM8940CGEFL/V Datasheet(PDF) 49 Page - Cirrus Logic

Part # WM8940CGEFL/V
Description  Mono CODEC with Speaker Driver
PDF  88 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8940CGEFL/V Datasheet(HTML) 49 Page - Cirrus Logic

Back Button WM8940CGEFL/V Datasheet HTML 45Page - Cirrus Logic WM8940CGEFL/V Datasheet HTML 46Page - Cirrus Logic WM8940CGEFL/V Datasheet HTML 47Page - Cirrus Logic WM8940CGEFL/V Datasheet HTML 48Page - Cirrus Logic WM8940CGEFL/V Datasheet HTML 49Page - Cirrus Logic WM8940CGEFL/V Datasheet HTML 50Page - Cirrus Logic WM8940CGEFL/V Datasheet HTML 51Page - Cirrus Logic WM8940CGEFL/V Datasheet HTML 52Page - Cirrus Logic WM8940CGEFL/V Datasheet HTML 53Page - Cirrus Logic Next Button
Zoom Inzoom in Zoom Outzoom out
 49 / 88 page
background image
WM8940
Rev 4.4
49
OUTPUT SWITCH
When the device is configured with a 2-wire interface the CSB/GPIO pin can be used as a switch
control input to automatically disable the speaker outputs and enable the mono output.
As an
example when a line is plugged into a jack socket. In this mode, enabled by setting GPIOSEL=001,
pin CSB/GPIO switches between mono and speaker outputs (e.g. when pin 12 is connected to a
mechanical switch in the headphone socket to detect plug-in). The GPIOPOL bit reverses the polarity
of the CSB/GPIO input pin.
Note that the speaker outputs and the mono output must be enabled for this function to work (see
Table 41). The CSB/GPIO pin has an internal de-bounce circuit when in this mode in order to prevent
the output enables from toggling multiple times due to input glitches. This de-bounce circuit is clocked
from a slow clock with period 221 x MCLK, enabled using the SLOWCLKEN register bit.
GPIOPOL
CSB/GPIO
SPKNEN/
SPKPEN
MONOEN
SPEAKER
ENABLED
MONO
OUTPUT
ENABLED
0
0
0
X
No
No
0
0
1
X
Yes
No
0
1
X
0
No
No
0
1
X
1
No
Yes
1
0
X
0
No
No
1
0
X
1
No
Yes
1
1
0
X
No
No
1
1
1
X
Yes
No
Table 41 Output Switch Operation (GPIOSEL=001)
THERMAL SHUTDOWN
The speaker outputs can drive very large currents. To protect the WM8940 from overheating a
thermal shutdown circuit is included. The thermal shutdown can be configured to produce an interrupt
when the device reaches approximately 125oC. See General Purpose Input/Output section.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R49
Output control
1
TSDEN
1
Thermal Shutdown Enable
0 : thermal shutdown disabled
1 : thermal shutdown enabled
Table 42 Thermal Shutdown
SPEAKER OUTPUT
SPKOUTP/N can differentially drive a mono 8
 Bridge Tied Load (BTL) speaker as shown below.
SPKOUTN
SPKOUTP
WM8940
-1
SPEAKER
MIXER
SPKVOL
SPKBOOST
VSPKR = Mono – (-Mono) = 2xMono
Figure 22 Speaker Output Connection



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88


Datasheet Download

Go To PDF Page


Link URL



Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link to Datasheet    |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com