SH3003 datasheet(1/30 Pages) SEMTECH

部件名	SH3003

功能描述	MicroBuddy짰 Support IC for Microcontrollers

PDF	30 Pages

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制造商	SEMTECH [Semtech Corporation]

网页	http://www.semtech.com

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MicroBuddy® Support IC

for Microcontrollers

POWER MANAGEMENT

SH3003

May 23, 2006

Three components make a complete system: any

microcontroller, the SH3003, and a bypass capacitor. This

low-cost system would consume very little power and have

clock-frequency accuracy of ± 0.5%. A fourth component,

a 32.768kHz crystal, raises the clock frequency accuracy

to ± 0.0256% (± 256 ppm).

The SH3003 can operate completely stand-alone, or un-

der control of the microcontroller. A single-wire interface

handles both bi-directional communications and the in-

terrupt/wake-up signal from the SH3003. The SH3003

stores all conﬁguration, calibration, parameters, and sta-

tus information in a 36-byte bank of control registers. On

reset, most of these are reloaded with defaults from the

factory-set non-volatile memory. The microcontroller can

change any settings on the ﬂy. If some of the settings must

remain ﬁxed, a comprehensive set of write-protect bits is

provided for several related groups of registers (with both

permanent write-inhibit and lock/unlock capabilities).

A backup power source may also be connected to the

SH3003. The IC can directly accommodate 2/3-cell zinc-

carbon/alkaline, 2/3-cell mercury, 2/3/4-cell NiCd/NiMH,

one cell Li/Li+ batteries, or a super cap.

The programmable SH3003 MicroBuddy® (μBuddy®)

provides

all

mandatory

microcontroller

support

functions:

CPU Supervisor

Clock Management System

Real-Time Support

Auxiliary Functions

Home automation and security

Consumer products

Portable/handheld computers

Industrial equipment

Any microcontroller-based product

Highly integrated

IC - 3mm x 3mm x 0.9mm, 16-lead MLP

(QFN) package

CPU Supervisor

Low VDD reset programmable from 2.3V to 4.3V

Watchdog timer with programmable time out

periods

Both active-high and active-low reset outputs

Clock Management System

Replaces high-frequency (HF) crystal or resonator

Programmable clock output from 32.768kHz to

16MHz

Speed shift between multiple clock frequencies

Adjustable spectrum spreading for EMI reduction

Directly supports microcontroller STOP function

Deep sleep with instantaneous auto-wakeup

Real-Time Support

179 year real-time clock, battery-backup capable

Dedicated 32.768kHz buffered clock output

Built-in trim for 32.768kHz oscillator to ±4ppm

Programmable periodic interrupt/wakeup timer

Auxiliary Functions

4-byte (32-bit) scratchpad RAM, loaded on reset

with factory-set value (zero or optional ID code)

All settings programmable in real time, defaults

restored from nonvolatile memory on reset

Operates from 2.3V to 5.5V

IDD < 850μA /2MHz, < 3mA / 16MHz, <10μA/

standby - IBUP < 2μA / IBSB <50nA (battery back

up/standby)

•

Description

Features

Applications

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