WM8959 Wolfson Microelectronics Ltd., WM8959 Datasheet - Page 118

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

WM8959
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CHIP RESET AND ID
The device ID can be read back from register 0. Writing to this register will reset the device.
Table 71 Chip Reset and ID
SAVING POWER AT HIGHER SUPPLY VOLTAGE
The AVDD supply of the WM8959 can operate between 2.7V and 3.6V. By default, all analogue
circuitry on the device is optimized to run at 3.3V. This set-up is also good for all other supply
voltages down to 2.7V. At lower voltages, performance can be improved by increasing the bias
current. If low power operation is preferred the bias current can be left at the default setting. This is
controlled as shown in Table 72.
Table 72 Bias Optimisation
R51 (33h)
R0 (00h)
Reset / ID
REGISTER
REGISTER
ADDRESS
ADDRESS
15:0
8:7
BIT
BIT
LABEL
VSEL
[1:0]
SW_RESET_
CHIP_ID
[15:0]
(rr)
LABEL
11
DEFAULT
8990h
DEFAULT
Analogue Bias Optimisation
00 = Reserved
01 = Bias current optimized for AVDD=2.7V
1X = Bias current optimized for AVDD=3.3V
Writing to this register resets all registers
to their default state.
Reading from this register will indicate
device family ID 8990h.
DESCRIPTION
DESCRIPTION
PP, May 2008, Rev 3.1
Pre-Production
118