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WM8940CGEFL/V Datasheet(PDF) 51 Page - Wolfson Microelectronics plc |
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WM8940CGEFL/V Datasheet(HTML) 51 Page - Wolfson Microelectronics plc |
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51 / 91 page  Production Data WM8940 w PD, Rev 4.3, November 2011 51 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 125 oC. 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. Figure 22 Speaker Output Connection |
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