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WM8595 Datasheet(PDF) 47 Page - Wolfson Microelectronics plc |
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WM8595 Datasheet(HTML) 47 Page - Wolfson Microelectronics plc |
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47 / 82 page  Production Data WM8595 w PD, Rev 4.2, January 2011 47 POWERDOWN SEQUENCE 1. Mute all PGAs: • MUTE_ALL=1 2. Set up biases for power down mode: • FAST_EN=1 • VMID_SEL=01 • BIAS_EN=1 • BUFIO_EN=1 • VMIDTOG=0 • SOFT_ST=1 3. Switch outputs to use fast bias instead of master bias: • POBCTRL=1 4. Power down all WM8595 functions (ADC, DACs, PGAs etc.). The outputs are muted so the write order is not important. 5. Power down VMID to allow the analogue outputs to ramp gently to ground in a pop-free manner. • VMID_SEL=00 6. Wait until VMID2C has fully discharged. The time taken depends on system capacitance and should be evaluated by the customer in their application. • Insert delay 7. Clamp outputs to ground. • APE_B=0 8. Power down outputs. • VOUTxL_EN=0 • VOUTxR_EN=0 9. Disable remaining bias control bits. • FAST_EN=0 • POBCTRL=0 • BIAS_EN=0 Power supplies can now be safely removed from the WM8595 if desired. |
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