SH3003 Datasheet, PDF (1/30 Pages) Semtech Corporation – MicroBuddy® Support IC for Microcontrollers

POWER MANAGEMENT
SH3003
MicroBuddy® Support IC
for Microcontrollers
Description
Features
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.
‹ 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
The programmable SH3003 MicroBuddy® (μBuddy®)
provides all mandatory microcontroller support
functions:
‹ CPU Supervisor
‹ Clock Management System
‹ Real-Time Support
‹ Auxiliary Functions
Applications
‹ 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)
‹ Home automation and security
‹ Consumer products
‹ Portable/handheld computers
‹ Industrial equipment
‹ Any microcontroller-based product
May 23, 2006
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