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WM9711 Datasheet(PDF) 31 Page - Wolfson Microelectronics plc |
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WM9711 Datasheet(HTML) 31 Page - Wolfson Microelectronics plc |
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31 / 66 page  Production Data WM9711L w PD Rev 4.1 April 2004 31 PHONE OUTPUT (MONOOUT) The MONOOUT output (pin 33) is intended for connection to the TX side of a wireless chipset. The signal is generated in a dedicated mono mixer; it is not necessarily a mono mix of the stereo outputs HPOUTL/R or LOUT2/ROUT2 (see “Audio Mixers” section). The MONOOUT volume can be controlled by writing to register 06h. When MONOOUT is not used, the output buffer can be disabled to save power (see “Power Management” section). The MONOOUT pin remains at the same DC level (the reference voltage on the VREF pin), so that no click noise is produced when muting or un-muting. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 15 MUTE 1 Mute MONOOUT 1: Mute 0: No Mute 7 ZC 0 Zero Cross Enable 0: Change gain immediately 1: Change gain only on zero crossings, or after time-out 06h MONOOUT Volume 4:0 MONOOUT VOL 00000 (0dB) MONOOUT Volume 00000: 0dB (maximum) 00001: -1.5dB … (1.5dB steps) 11111: -46.5dB Table 18 MONOOUT Control THERMAL CUTOUT The speaker and headphone outputs can drive very large currents. To protect the WM9711L from becoming too hot, a thermal cutout has been built in. If the chip temperature reaches approximately 150 °C, and the ENT bit is set, the WM9711L deasserts GPIO bit 11 in register 54h, a virtual GPIO that can be set up to generate an interrupt to the CPU (see “GPIO and Interrupt Control” section). REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 5Ch 2 ENT 0 Enable thermal cutout 0: Disabled 1: Enabled 54h 11 TI 1 Thermal cutout (virtual GPIO) 1: Temperature below 150 °C 0: Temperature above 150 °C See also “GPIO and Interrupt Control” section. Table 19 Thermal Cutout Control |
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