SH3003 datasheet(9/30 Pages) SEMTECH

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POWER MANAGEMENT

SH3003

POWER MANAGEMENT

Application Information

The SH3003 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 nonvolatile memory. This allows

the SH3003 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 SH3003 may not be realized.

In the preferred conﬁguration, where the SH3003 is

tightly coupled to the target micro, the SH3003 offers

an unprecedented level of design ﬂexibility in clock and

power usage management.

The SH3003 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 SH3003 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 SH3003 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 SH3003. The individual functional blocks are

described in the following sections.

Default Start-Up Parameters

While the operating parameters of the SH3003 are

programmable by the host microcontroller at any

time, the default start-up parameters and appropriate

calibration values are programmed into the chip’s non-

volatile memory at the factory. This enables the SH3003

to be used stand-alone or in an embedded application

with minimal microprocessor intervention.

Default start-up parameters for the SH3003 are:

Reset and VBO voltage level is 2.3V

CLKOUT frequency is 16.0MHz

CLK32 output is disabled

Spread spectrum is disabled

Internal RC oscillator is calibrated (to nominal

frequency of 32768Hz

Internal load capacitors on the 32.768kHz crystal

oscillator pins are set to 12.5pF.

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