WM8940GEFL/V Wolfson Microelectronics, WM8940GEFL/V Datasheet - Page 49

• Manufacturer Part Number: WM8940GEFL/V
• Description: Audio CODECs Mono CODEC with Speaker Driver
• Manufacturer: Wolfson Microelectronics

Specifications of WM8940GEFL/V

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-24
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Production Data
Table 41 Output Switch Operation (GPIOSEL=001)
THERMAL SHUTDOWN
Table 42 Thermal Shutdown
SPEAKER OUTPUT
Figure 22 Speaker Output Connection
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 125
SPKOUTP/N can differentially drive a mono 8Ω Bridge Tied Load (BTL) speaker as shown below.
0
0
0
0
1
1
1
1
R49
Output control
GPIOPOL
REGISTER
ADDRESS
0
0
1
1
0
0
1
1
CSB/GPIO
1
BIT
TSDEN
LABEL
0
1
X
X
X
X
0
1
SPKNEN/
SPKPEN
1
DEFAULT
X
X
0
1
0
1
X
X
MONOEN
o
C. See General Purpose Input/Output section.
Thermal Shutdown Enable
0 : thermal shutdown disabled
1 : thermal shutdown enabled
No
Yes
No
No
No
No
No
Yes
SPEAKER
ENABLED
DESCRIPTION
PD, Rev 4.2, April 2008
No
No
No
Yes
No
Yes
No
No
ENABLED
OUTPUT
MONO
WM8940
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