WM8352 datasheet(117/336 Pages) WOLFSON

117 / 336 page

Production Data

WM8352

PD, February 2011, Rev 4.4

117

14.5 CUSTOM MODES

The WM8352 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:



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



Selection of crystal oscillator detect mode (see Section 14.3.6)



Configuration of the voltage settings and start-up timeslots for DC-DC and LDO supplies



Configuration of GPIO pins

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) must 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 WM8352 in the OFF state. As a result, evaluation

and debugging in custom modes is limited.

14.5.1

CONFIGURATION MODE 01

In Configuration Mode 01, the following general default settings apply:

PARAMETER

DESCRIPTION

ON polarity

ON_POL = 1

ON pin is Active Low

USB power source

USB_SLV_500MA = 1

Selects 500mA limit in USB slave

Watchdog timer

WDOG_MODE [1:0] = 00

Watchdog is disabled

Control Interface

SPI_3WIRE = 0

SPI_4WIRE = 0

SPI_CFG = 0

Control Interface is 2-wire mode

32kHz oscillator

OSC32K_ENA = 1

32kHz Oscillator is enabled

Real Time Clock

RTC_TICK_ENA = 1

RTC_CLKSRC = 0

Real Time Clock is enabled

LDO1

LDO1_PIN_MODE = 0

LDO1_PIN_EN = 0

LDO1 controlled as normal via

Crystal detect

mode

Crystal detect mode is not enabled.

The default voltages and the power-up sequence for all DC-DCs and LDOs in Configuration Mode 01

are shown below in Table 65 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 WM8352 enters the ACTIVE state.

WM8352 Datasheet(PDF) 117 Page - Wolfson Microelectronics plc

WM8352 Datasheet(HTML) 117 Page - Wolfson Microelectronics plc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL