WM8351 datasheet(183/330 Pages) WOLFSON

183 / 330 page

Production Data

WM8351

PD, April 2012, Rev 4.5

183

ALTERNATE

FUNCTION NAME

INPUT /

OUTPUT

DESCRIPTION

/MEMRST

Output

Output used to control other subsystems such as external

memory. Signal goes low to reset external memory. The

status of this signal in the Hibernate state is configurable,

allowing external memory contents to be retained in

Hibernate. See Section 14.

P_CLK

Output

1MHz output clock in phase with the internal DC-DC

converters. This signal can be used to sync external circuits

(e.g. DC-DCs).

POR_B

Output

Output which toggles low to high during power-on reset

PWR_ON

Output

Output used to indicate that device is powered on (eg. to

enable external DC-DC converters). This output is disabled

in the OFF state.

/RST

Output

Output used to indicate system resets. Signal goes low

during reset, same as the /RST pin. The pulse duration is

programmable. See Section 14.

RTC

Output

Real Time Clock output - frequency is controlled by

RTC_DSW[3:0]. See Section 22.

SDOUT

Output

4-wire Control Interface data output pin (SDOUT). Note that

this function is selected automatically on GPIO6 when 4-

wire mode is selected, ie. regardless of the GP6_FN control

field. See Section 11.

/VCC_FAULT

Output

Indicates a fault condition on selectable DC Converters,

LDO Regulators and the Limit Switch. The mask bits in

status flag. See Section 14.6.5, Section 14.7.3 and

Section 15.2.3.

VRTC

Output

Output from on-chip backup power source voltage regulator

VRTC.

32kHz

Output

32kHz clock output from the Real Time Clock oscillator.

Table 124 List of GPIO Alternate Functions

WM8351 Datasheet(PDF) 183 Page - Wolfson Microelectronics plc

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