wm8321 Wolfson Microelectronics plc, wm8321 Datasheet

wm8321

Manufacturer Part Number

wm8321

Description

Processor Power Management Subsystem

Manufacturer

Wolfson Microelectronics plc

Datasheet

1.WM8321.pdf (10 pages)

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DESCRIPTION

WM8321 is an integrated power-management subsystem

which provides a cost-effective, flexible, single-chip solution

for

requirements of a range of low-power portable applications.

WM8321 is specifically designed to operate as a system PMIC

supporting the ARM9™, ARM11™ and ARM Cortex-A™

series processors at the heart of a range of low-power

applications.

The

programmable in an integrated OTP non-volatile memory. This

highly flexible solution helps reduce time-to-market, as

changing application requirements can be very easily

accommodated in the OTP contents. An external EEPROM

can be used to configure the WM8321 for development

purposes.

The WM8321 power management subsystem comprises four

programmable DC-DC converters and eleven LDO regulators

(four of which are low-noise for supplying sensitive analogue

subsystems). The integrated OTP bootstrap circuitry controls

the start-up sequencing and voltages of the converters and

regulators as well as the sequencing of system clocks.

The DC-DC converters deliver high performance and high

efficiency across a wide range of operating conditions. They

are optimised to support the high load current transients seen

in modern processor core domains. DC-DC3 / DC-DC4 can be

connected together and operated in ‘dual’ mode to support an

increased current load of up to 1.6A.

An on-chip regulator provides power for always-on PMIC

functions such as register map and the RTC. The device

provides autonomous backup battery switchover. A low-power

LDO is included to support ‘Alive’ processor power domains

external to the WM8321.

A 12-bit Auxiliary ADC supports a wide range of applications

for internal as well as external analogue sampling, such as

voltage detection and temperature measurement.

WM8321 includes a crystal oscillator and an internal RC

oscillator to generate all clock signals for autonomous system

start-up and processor clocking. A Secure Real-time Clock (S-

RTC) and alarm function is included, capable of waking up the

system from low-power modes. A watchdog function is

provided to ensure system integrity.

To maximise battery life, highly-granular power management

enables each function in the WM8321 subsystem to be

independently powered down through a control interface or

alternatively through register and OTP-configurable GPIOs.

The device offers a standby power consumption of <10uA,

making it particularly suitable for portable applications.

The WM8321 is supplied in an 8x8mm 81-lead QFN package,

ideal for use in portable systems. The WM8321 forms part of

the Wolfson series of audio and power management solutions,

and is widely register compatible with the WM831X family of

PMIC devices.

WOLFSON MICROELECTRONICS plc

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the

FEATURES

Power Management

•

System Control

•

Additional Features

•

Package Options

•

APPLICATIONS

•

2 x DC-DC buck converter (0.6V - 1.8V, up to 1.25A, DVS)

2 x DC-DC buck converter (0.85V - 3.4V, up to 1A)

1 x LDO regulator (0.9V - 3.3V, 300mA, 1Ω)

2 x LDO regulators (0.9V - 3.3V, 200mA, 1Ω)

3 x LDO regulators (0.9V - 3.3V, 100mA, 2Ω)

2 x Low-noise LDO regulators (1.0V - 3.5V, 200mA, 1Ω)

2 x Low-noise LDO regulators (1.0V - 3.5V, 150mA, 2Ω)

1 x ‘Alive’ regulator (0.8V – 1.55V, up to 10mA)

Comprehensive interrupt scheme

Watchdog timer and system reset control

Autonomous power sequencing and fault detection

OTP memory bootstrap configuration function

Auxiliary ADC for multi-function analogue measurement

128-bit pseudo-random unique ID

Secure Real-Time Clock with wake-up alarm

12 x configurable multi-function (GPIO) pins

Comprehensive clocking scheme: low-power 32kHz RTC

crystal oscillator, GPIO clock output and 4MHz RC clock

for power management

System LED outputs indicating device power state, and

fault status

8x8mm, 0.85mm thick, 81-lead QFN package

Cellular Handsets

Smartphones

Electronic Books

Portable Media Players

Mobile Internet Devices

Electronic Gaming Devices

Netbooks

Set Top Box

C or SPI compatible primary control interface

Product Brief, April 2010, Rev 1.2

WM8321

Related parts for wm8321

wm8321 Summary of contents

Page 1

... The device offers a standby power consumption of <10uA, making it particularly suitable for portable applications. The WM8321 is supplied in an 8x8mm 81-lead QFN package, ideal for use in portable systems. The WM8321 forms part of the Wolfson series of audio and power management solutions, and is widely register compatible with the WM831X family of PMIC devices ...

Page 2

... Clocking and Auxiliary ADC Functions w DC-DC1 Dynamic Buck Bootstrap 0.6 to 1.8V Interface EEPROM 1.25A Interface DVS OTP NVM Bootstrap Config & Interface Unique 4MHz WM8321 RC Oscillator Power Management ` Control PM Sub- System Monitoring AP Interface, GPIOs and PM Control Aux ADC Real-Time Wake-Up Clock Timer Power Management DC-DC3 ...

Page 3

... OTP 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. The WM8321 provides a battery charger for the backup battery ...

Page 4

... Note: Reel quantity = 2,200 EGP (Exposed Ground Paddle Top View - WM8321 PACKAGE ) A 81-lead QFN (8 x 8mm) (Pb-free) 81-lead QFN (8 x 8mm) (Pb-free, tape and reel A10 A11 B8 B9 B10 B11 ...

Page 5

... Product Brief PIN DESCRIPTION Notes: 1. Pins are sorted by functional groups. 2. The power domain associated with each pin is noted; VPMIC is the domain powered by LDO12 for the ‘always-on’ functions internal to the WM8321. PIN NAME Clocking and Real Time Clock Y12 XTO Analogue Output ...

Page 6

... WM8321 PIN NAME Y10 SCLK2 W10 SDA2 B11 DBVDD1 F1 DBVDD2 OTP Memory Y3 PROGVDD DC-DC Converters and LDO Regulators Exposed EGP Analogue Ground Ground Paddle B7 DC1GND A8 DC1FB Analogue Input A7 DC1LX Analogue I/O B8 DC1VDD B6 DC2GND A5 DC2FB Analogue Input A6 DC2LX Analogue I/O B5 DC2VDD M1 DC3GND J1 DC3FB Analogue Input ...

Page 7

... Current Reference resistor connection point Supply System VDD Supply Supply System VDD Supply Supply System VDD Supply Supply Secondary (Backup) Battery Supply Status LED Driver 1. Open Drain Output PVDD3 Status LED Driver 2. Open Drain Output Do Not Connect WM8321 DESCRIPTION Product Brief, April 2010, Rev 1.2 7 ...

Page 8

... The OTP Programming Supply PROGVDD should only be present when programming the OTP. At other times, this pin should be left unconnected. The LDO12VOUT must be overdriven by an external supply when programming the OTP. At other times, the voltage at this pin is driven by the internal circuits of the WM8321. w ...

Page 9

... 3.175 3.675 ddd DETAIL C A2 (A3) A Ø0.25±0.03 ddd DETAIL D MAX NOTE 0.85 0.08 0.71 0.14 0.28 5.65 5.65 0.28 0.43 0.53 WM8321 DM082 aaa C TOP VIEW bbb C C SECTION C-C ccc C Product Brief, April 2010, Rev 1.2 9 ...

Page 10

... WM8321 IMPORTANT NOTICE Wolfson Microelectronics plc (“Wolfson”) products and services are sold subject to Wolfson’s terms and conditions of sale, delivery and payment supplied at the time of order acknowledgement. Wolfson warrants performance of its products to the specifications in effect at the date of shipment. Wolfson reserves the right to make changes to its products and specifications or to discontinue any product or service without notice ...

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