SH3000 Datasheet, PDF (1/24 Pages) Semtech Corporation – Low-Power Programmable Multifunction Support IC for Microcontrollers

SYSTEM MANAGEMENT
Description
The programmable SH3000 MicroBuddy™ (µBuddy™)
provides all mandatory microcontroller support functions:
♦ CPU Supervisor
♦ Clock Management System
♦ Real Time Support
♦ Auxiliary functions
Three components make a complete system: any
microcontroller, the SH3000, 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 32.768 kHz watch crystal, raises the clock
frequency accuracy to ± 0.0256% (± 256 ppm).
The SH3000 can operate completely stand-alone, or
under control of the microcontroller. A single-wire
interface handles both bi-directional communications and
the interrupt / wake-up signal from the SH3000. The
SH3000 stores all configuration, calibration, parameters,
and status information in a 36-byte bank of control
registers. On reset, most of these are reloaded with
defaults from the factory-set One-Time-Programmable
(OTP) 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
SH3000. The IC can directly accommodate 2/3-cell zinc-
carbon/alkaline, 2/3-cell mercury, 2/3/4-cell NiCd/NiMH, 1-
cell Li/Li+ batteries, or a super cap.
Applications
♦ Home automation and security
♦ Consumer products
♦ Portable/handheld computers
♦ Industrial equipment
♦ Any microcontroller-based product
V+
VDD
CBYPASS
XIN
XOUT
GPIO WITH INT
SH3000 MicroBuddy™
Low-Power Programmable Multifunction
Support IC for Microcontrollers
Features
♦ Highly integrated IC
- 3mm x 3mm x 0.9 mm 16-lead MLP (QFN) package
♦ CPU Supervisor
- Low VDD reset programmable from 2.3 V to 4.3 V
- Watchdog timer with programmable timeout periods
- Both active-high and active-low reset outputs
♦ Clock Management System
- Replaces High-Frequency (HF) crystal or resonator
- Programmable clock output from 32 kHz to 16 MHz
- 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 kHz buffered clock output
- Built-in trim for 32.768 kHz 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 OTP memory on reset
♦ Operates from 2.3 V to 5.5 V
♦ IDD <850µA / 2MHz, <3mA / 16MHz, <10µA/standby
♦ IBUP <2µA / IBSB <50nA (battery backup / standby)
♦ Protected by issued and pending
US and International Patents
Pin Configuration
16 15 14 13
VSS ¹
VREG ²
VDD ³
VBAK ⁴
µB^TM
12 _{TEST (VSS)}
11 _RST
SH3000 ¹⁰ NRST
9 _RREF
5678
1
2
µB^TM
12
11
3
10
4 _SH3000 9
NRESET
µController
GND
Typical Application Circuit with High Clock Accuracy
3mm MLP (QFN) Package
Covered by US Patent No. 6,903,986
Semtech, the Semtech logo, MicroBuddy, µBuddy, and µB are marks of
Semtech Corporation. All other marks belong to their respective owners.
2005-08-08 Copyright ©2003-2005 Semtech Corporation 1
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