WM8321 datasheet(3/253 Pages) WOLFSON

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Production Data

WM8321

PD, February 2012, Rev 4.0

TYPICAL APPLICATIONS

The WM8321 is designed as a system PMIC device that generates configurable DC supplies to

power processors and associated peripherals within a system. The WM8321 provides four DC-DC

synchronous buck (step-down) converters. Two of these can operate in dual mode, providing an

increased current capability. Eleven LDO regulators provide a high degree of flexibility to provide

power to multiple devices, with the capability to power-up and power-down different circuits

independently.

Two of the DC-DC buck converters incorporate Wolfson’s BuckWise

TM technology specifically

designed to handle rapid changes in load current; programmable slew rate DVS is also provided, as

required by modern application processors. Selectable operating modes on all of the DC-DC

converters allow each converter to be optimally configured for light, heavy or transient load

conditions. Flexible operating configurations allow the converters to be tailored for minimum PCB

area, maximum performance, or for maximum efficiency. The analogue LDOs provide low-noise

outputs suitable for powering sensitive circuits such as RF / Wi-Fi / cellular handset applications.

The WM8321 powers up the converters and LDOs according to a programmable sequence. A

configurable ‘SLEEP’ state is also available, providing support for an alternate configuration, typically

for low-power / standby operation. The power control sequences and many other parameters can be

stored in an integrated user-configurable OTP (One-Time Programmable) memory or may be loaded

from an external memory. The WM8321 supports the programming and verification of the integrated

OTP memory.

A backup battery supply can be connected to the WM8321 in order to maintain the Real Time Clock

(RTC) in the absence of the primary supply.

Programmable GPIO pins may be configured as hardware inputs for general use or for selecting

different power management configurations. As outputs, the GPIOs can provide indications of the

device status, or may be used as control signals for other power management circuits. The WM8321

also provides two LED drivers, which can be controlled manually or configured as status indicators for

the OTP memory programmer or operating power state.

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