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WM8955BLGECO/V 数据表(PDF) 23 Page - Wolfson Microelectronics plc |
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WM8955BLGECO/V 数据表(HTML) 23 Page - Wolfson Microelectronics plc |
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23 / 44 page  Production Data WM8955BL w PD Rev 4.1 February 2007 23 ANALOGUE OUTPUTS ENABLING THE OUTPUTS Each analogue output of the WM8955BL can be separately enabled or disabled. The analogue mixer associated with each output is powered on or off along with the output pin. All outputs are disabled by default. To save power, unused outputs should remain disabled. Outputs can be enabled at any time, except when the WM8955BL is in OFF mode, as this may cause pop noise (see Minimising Pop Noise at the Analogue Outputs) REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 6 LOUT1 0 0 = LOUT1 disabled 1 = LOUT1 enabled 5 ROUT1 0 0 = ROUT1 disabled 1 = ROUT1 enabled 4 LOUT2 0 0 = LOUT2 disabled 1 = LOUT2 enabled 3 ROUT2 0 0 = ROUT2 disabled 1 = ROUT2 enabled 2 MONO 0 0 = MONOOUT disabled 1 = MONOOUT enabled R26 (1Ah) Power Management (2) 1 OUT3 0 0 = OUT3 disabled 1 = OUT3 enabled Table 11 Analogue Output Control Whenever an analogue output is disabled, it remains connected to VREF through an internal resistor. This helps to prevent pop noise when the output is re-enabled. The resistance between VREF and each output can be controlled using the VROI bit in register 27. The default is low (1.5k Ω), so that any capacitors on the outputs can charge up quickly at start-up. If a high impedance is desired for disabled outputs, VROI can then be set to 1, increasing the resistance to about 40k Ω. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R27 (1Bh) Additional (3) 6 VROI 0 VREF to analogue output resistance 0: 1.5 k Ω 1: 40 k Ω Table 12 Disabled Outputs to VREF Resistance THERMAL SHUTDOWN The earpiece and headphone outputs can drive very large currents. To protect the WM8955BL from overheating, a thermal shutdown circuit is included. If the device temperature reaches approximately 150 0C and the thermal shutdown circuit is enabled (TSDEN = 1) then the output amplifiers (outputs OUT1L/R, OUT2L/R & OUT3) will be disabled. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R23 (17h) Additional (1) 8 TSDEN 0 Thermal Shutdown Enable 0 : thermal shutdown disabled 1 : thermal shutdown enabled Table 13 Thermal Shutdown |
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