WM8959 datasheet(118/155 Pages) WOLFSON

tên linh kiện	WM8959

Giải thích chi tiết về linh kiện	Mobile Multimedia DAC with Dual-Mode Class AB/D Speaker Driver

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WM8959

Pre-Production

PP, May 2008, Rev 3.1

118

CHIP RESET AND ID

The device ID can be read back from register 0. Writing to this register will reset the device.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R0 (00h)

Reset / ID

15:0

SW_RESET_

CHIP_ID

[15:0]

(rr)

8990h

Writing to this register resets all registers

to their default state.

Reading from this register will indicate

device family ID 8990h.

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.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R51 (33h)

8:7

VSEL

[1:0]

Analogue Bias Optimisation

00 = Reserved

01 = Bias current optimized for AVDD=2.7V

1X = Bias current optimized for AVDD=3.3V

Table 72 Bias Optimisation

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