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WM8983GEFL/V Datasheet(PDF) 78 Page - Wolfson Microelectronics plc |
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WM8983GEFL/V Datasheet(HTML) 78 Page - Wolfson Microelectronics plc |
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78 / 124 page  WM8983 Production Data w PD, Rev 4.3, May 2010 78 ENABLING THE OUTPUTS Each analogue output of the WM8983 can be independently enabled or disabled. The analogue mixer associated with each output has a separate enable bit. All outputs are disabled by default. To save power, unused parts of the WM8983 should remain disabled. Outputs can be enabled at any time, but it is not recommended to do so when BUFIO is disabled (BUFIOEN=0), as this may cause pop noise (see “Power Management” and “Applications Information” sections). REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R1 Power Management 1 2 BUFIOEN 0 Unused input/output bias buffer enable 6 OUT3MIXEN 0 OUT3 mixer enable 7 OUT4MIXEN 0 OUT4 mixer enable 8 BUFDCOPEN 0 Output stage 1.5xAVDD/2 driver enable R2 Power Management 2 8 ROUT1EN 0 ROUT1 output enable 7 LOUT1EN 0 LOUT1 output enable 6 SLEEP 0 0 = Normal device operation 1 = Supply current reduced in device standby mode if clocks are still running R3 Power Management 3 2 LMIXEN 0 Left mixer enable 3 RMIXEN 0 Right mixer enable 5 ROUT2EN 0 ROUT2 output enable 6 LOUT2EN 0 LOUT2 output enable 7 OUT3EN 0 OUT3 enable 8 OUT4EN 0 OUT4 enable R42 Output ctrl1 1 DELEN 0 2 nd enable bit for L/ROUT1 0 OUT1DEL 0 2 stage enable for L/ROUT1 Note: All “Enable” bits are 1 = ON, 0 = OFF Table 51 Output Stages Power Management Control OUT1DEL and OUT2DEL enable lower pop noise power-up option. See start–up sequences. (in 2 stage enable method, normal enable bit is set, followed shortly later by the delayed enable DELEN) THERMAL SHUTDOWN To protect the WM8983 from overheating a thermal shutdown circuit is included. If the device temperature reaches approximately 125 0C and the thermal shutdown circuit is enabled (TSDEN=1) the L/ROUT2 amplifiers will be disabled. The thermal shutdown may also be configured to generate an interrupt. See the GPIO and Interrupt Controller section for details. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R49 Output Control 1 TSDEN 1 Thermal Shutdown Enable 0 : thermal shutdown disabled 1 : thermal shutdown enabled Table 52 Thermal Shutdown |
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