SH3000 datasheet(4/24 Pages) SEMTECH

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SH3000 MicroBuddy™

SYSTEM MANAGEMENT

V1.15 www.semtech.com

Functional Description

The SH3000 is a single-chip support system for

microcontrollers, microprocessors, DSPs and ASICs. It

consists of four major functional blocks, each block

having numerous enhancements over alternative

solutions.

The major modules are the CPU Supervisor, the

Clock Management System, the Real Time Support, and

the Auxiliary functions.

The entire chip is controlled by the set of internal

registers and accessed via the single-pin serial interface.

All of the settings, configuration, and calibration or

operating parameters are programmable and re-

programmable at any time. All of the parameters

required for stand-alone operations are initialized on

reset from the built-in factory-programmed OTP

nonvolatile memory. This allows the SH3000 to operate

autonomously for most of its supervisory functions. The

stand-alone operations do not require the use of the

serial interface or any of the initialization and control

operation, but without these, the full potential benefit of

the SH3000 may not be realized.

In the preferred configuration, where the SH3000 is

tightly coupled to the target micro, the SH3000 offers an

unprecedented level of design flexibility in clock and

power usage management.

The SH3000 is a particularly desirable integration

because the built-in features interact and meld to

produce more useful system level functions.

For example, on power up, the SH3000 can quickly

release the reset lines on its CPU Supervisor module

because the clock signal from the Clock Management

System is guaranteed to be running and stabilized. An

ordinary reset circuit must hold reset active for a long

time to allow an unknown crystal to start up and

stabilize.

The SH3000 offers several ways to minimize system

power consumption, such as allowing the target

processor to enter deep sleep by stopping its clock

completely, and to wake up as often as necessary with

no external support. The clock can be programmed to

start up at a given frequency, and software can adjust it

dynamically to manage power consumption and different

operating modes.

Users should consider the interactions of the major

functional blocks to gain the maximum advantage from

the SH3000.

The individual functional blocks are described in the

following sections.

SH3000 Datasheet(PDF) 4 Page - Semtech Corporation

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