WM8959 Wolfson Microelectronics Ltd., WM8959 Datasheet - Page 123

• Manufacturer Part Number: WM8959
• Description: Mobile Multimedia DAC with Dual-mode Class AB/D Speaker Driver
• Manufacturer: Wolfson Microelectronics Ltd.

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Pre-Production
Shut-down and Discharge Sequence
The following sequence describes the register settings required to mute, disable and discharge the
headphone outputs LOUT and ROUT. It assumes that the soft start control and voltage source is
already disabled.
Table 81 Example Shut-down and Discharge Control Sequence
6
7
1
2
3
4
5
STEP
Enable soft start control and
start-up bias source. Select
start-up bias.
Disable VMID
Time delay for soft-shutdown to
execute
Disable Output drivers.
Discharge output drivers.
Select default bias source.
Disable soft start control and
soft start voltage.
DESCRIPTION
SOFTST = 1
BUFCOPEN = 1
POBCTRL = 1
VMID_MODE = 00
ROUT_ENA = 0
DIS_LOUT = 1
DIS_ROUT = 1
POBCTRL = 0
SOFTST = 0
BUFCOPEN = 0
LOUT_ENA = 0
REGISTER SETTING
PP, May 2008, Rev 3.1
WM8959
123