wm8350 Wolfson Microelectronics plc, wm8350 Datasheet - Page 119

• Manufacturer Part Number: wm8350
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

Production Data
14.5 CUSTOM MODES
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The WM8350 provides three custom start-up modes. These are selected by setting the CONF1 and
CONF0 pins = 01, 10 or 11. The custom mode start-up sequences define the following parameters:
In Development Mode, the RECONFIG_AT_ON register bit (see Section 14.4.2) may be used to
control the device configuration behaviour. In Custom Modes 01, 10 or 11, the default setting
(RECONFIG_AT_ON = 1) should always be used. Setting this bit to 0 may result in erroneous
behaviour and deviation from the custom configuration settings.
The custom modes do not allow configuring the WM8350 in the OFF state. As a result, evaluation
and debugging in custom modes is limited.
14.5.1
In Configuration Mode 01, the following general default settings apply:
The default voltages and the power-up sequence for all DC-DCs and LDOs in Configuration Mode 01
are shown below in Table 64 and Figure 66.
The time delay between each time slot is approximately 1.28ms.
Note that the Limit Switch is not enabled automatically in Configuration Mode 01; as a result, the
Limit Switch remains open when the WM8350 enters the ACTIVE state.
ON polarity
USB power source
Watchdog timer
Control Interface
32kHz oscillator
Real Time Clock
LDO1
PARAMETER
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Polarity of the ON pin (Active low or high)
Configuration of the USB power source
Configuration of the Watchdog timer mode
Configuration of the Control Interface mode
Configuration of the 32kHz oscillator (enabled or disabled)
Configuration of the real-time-clock (enabled or disabled)
Configuration of LDO1
Configuration of the voltage settings and start-up timeslots for DC-DC and LDO supplies
Configuration of GPIO pins
CONFIGURATION MODE 01
ON_POL = 1
USB_SLV_500MA = 1
WDOG_MODE [1:0] = 00
SPI_3WIRE = 0
SPI_4WIRE = 0
SPI_CFG = 0
OSC32K_ENA = 1
RTC_TICK_ENA = 1
RTC_CLKSRC = 0
LDO1_PIN_MODE = 0
LDO1_PIN_EN = 0
REGISTER SETTING
ON pin is Active Low
Selects 500mA limit in USB slave
Watchdog is disabled
Control Interface is 2-wire mode
32kHz Oscillator is enabled
Real Time Clock is enabled
LDO1 controlled as normal via
register bits
DESCRIPTION
PD, June 2009, Rev 4.1
WM8350
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