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PDF WM8325 Data sheet ( Hoja de datos )
| Número de pieza | WM8325 | |
| Descripción | Processor Power Management Subsystem | |
| Fabricantes | Wolfson Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de WM8325 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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WM8325
Processor Power Management Subsystem
DESCRIPTION
The WM8325 is an integrated power-management subsystem
which provides a cost-effective, flexible, single-chip solution
for power management. It is specifically targeted at the
requirements of a range of low-power portable consumer
products, but is suitable to any application with a multimedia
processor. The WM8325 is designed to operate as a system
PMIC supporting the ARM9™, ARM11™ and ARM Cortex-A™
processors, but is also capable of supporting the majority of
application and mobile processors at the heart of a wide range
of low-power consumer multimedia applications.
The start-up behaviour and configuration is fully
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. The InstantConfig™ interface
enables an external EEPROM to configure the WM8325.
The WM8325 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 WM8325.
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.
WM8325 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 WM8325 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 <7uA,
making it particularly suitable for portable applications.
The WM8325 is supplied in an 8x8mm 81-lead QFN package,
ideal for use in portable systems. The WM8325 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
FEATURES
Power Management
• 1 x DC-DC synchronous buck converter
(0.6V - 1.8V, 2.5A, DVS)
• 1 x DC-DC synchronous buck converter
(0.6V - 1.8V, 1.25A, DVS)
• 2 x DC-DC synchronous buck converters
(0.85V - 3.4V, 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)
System Control
• I2C or SPI compatible primary control interface
• Comprehensive interrupt scheme
• Watchdog timer and system reset control
• Autonomous power sequencing and fault detection
• OTP memory bootstrap configuration function
Additional Features
• 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
Package Options
• 8 x 8 x 0.85mm, 81-lead QFN package
APPLICATIONS
• Cellular Handsets
• Smartphones
• Electronic Books
• Portable Media Players
• Mobile Internet Devices
• Electronic Gaming Devices
• Netbooks
• Smartbooks
• Set Top Box
• Digital Picture Frames
Product Brief, September 2010, Rev 1.3
To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews
Copyright ©2010 Wolfson Microelectronics plc
1 page  
Product Preview
PIN CONFIGURATION
WM8325
A1 A2 A3 A4 A5
A6
A7
A8 A9
A10
A11
B1 B2
C1
D1
E1
F1
G1
H1
J1
K1
L1
M1
B3
N1
P1
R1
B4 B5
B6 B7
EGP
(Exposed Ground Paddle)
B8
B9 B10
B11
D2 D3
F2 F3
H2 H3
K2 K3
M2 M3
N2 N3
R2 R3
T1 U1
U2 U3
V1 V2
V3 V4
W1 W2 W3
W4
W5
W6
W7
W8 W9
W10
W11
W12
Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9 Y10 Y11 Y12
Top View – WM8325
ORDERING INFORMATION
ORDER CODE
OTP
TEMPERATURE
RANGE (TA)
WM8325GEFL/V
Unprogrammed -40°C to +85°C
WM8325GEFL/RV
Unprogrammed -40°C to +85°C
WM8325GEFLxxx/RV*
Custom
-40°C to +85°C
Note:
Reel quantity = 2200
* xxx = Unique OTP part number
** Custom OTP minimum order quantity 22,000.
PACKAGE
81-lead QFN (8 x 8mm)
(Pb-free)
81-lead QFN (8 x 8mm)
(Pb-free, tape and reel)
81-lead QFN (8 x 8mm)
(Pb-free, tape and reel) **
MOISTURE
SENSITIVITY
LEVEL
MSL3
MSL3
MSL3
PEAK
SOLDERING
TEMPERATURE
260°C
260°C
260°C
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Product Brief, September 2010, Rev 1.3
5
5 Page 
Product Preview
WM8325
The WM8325 provides 4 DC-DC Converters and 11 LDO Regulators. The DC-DC Converters include
2 BuckWise™ valley-mode converters. The Regulators comprise general purpose LDOs (LDO1 -
LDO6) and low-noise analogue LDOs (LDO7 - LDO10). The analogue LDOs offer superior PSRR,
noise and load-transient performance. LDO11 is a low power LDO intended for powering “always on”
circuits connected to the WM8325; this LDO can be configured to remain enabled in the OFF state.
These power management components are designed to support application processors and
associated peripherals. DC-DC1 and DC-DC2 are intended to provide power to the processor voltage
domains; DC-DC3 is suitable for powering memory circuits or for use as a pre-regulator for the
LDOs. The output voltage of each of the buck converters and regulators is programmable in software
through control registers. DC-DC3 and DC-DC4 can be ganged together in dual mode, providing an
increased current capability for higher power processor voltage domains.
The WM8325 can execute programmable sequences of enabling and disabling the DC-DC
Converters and LDO Regulators as part of the transitions between the ON, OFF and SLEEP power
states. The WM8325 power management circuits can also interface with configurable hardware
control functions supported via GPIO pins. These include GPIO inputs for selecting alternate
voltages or operating modes, and GPIO outputs for controlling external power management circuits.
The configuration of the power management circuits, together with some of the GPIO pins and other
functions, may be stored in the integrated OTP memory. This avoids any dependence on a host
processor to configure the WM8325 at start-up.
BUCKWISE™ TECHNOLOGY
The BuckWise™ converter is the first Valley mode DC-DC converter integrated into a system PMIC.
This technology has several key benefits:
FEATURE
Market leading transient performance
Valley Mode Control (VMC)
>90% efficiency
Multiple modes of operation
Dynamic Voltage Scaling (DVS) control
with a single register write or via hardwired
GPIO pin.
BENEFITS
Able to use smaller capacitors to meet processor
transient requirements.
Processors are able to operate at lower voltages
(saving power) without hitting minimum voltage
specifications.
Ensures there is no performance degradation at low
output voltages (0.6V).
Will support next-generation processors (<45nm)
with low voltage requirements.
Longer battery life in portable devices.
Maintains high efficiency across the full load range,
increasing battery life.
Allows the regulator to slew from one output voltage
to another with a programmable slew rate.
Enables processor to switch seamlessly between
power modes for optimum processor performance at
the lowest possible power.
The BuckWise™ load transient performance is illustrated in Figure 1.
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Product Brief, September 2010, Rev 1.3
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet WM8325.PDF ] | |
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