SH3001 Datasheet, PDF (1/20 Pages) Semtech Corporation – Real-Time Clock and Clock Management Support IC for Microcontrollers

SYSTEM MANAGEMENT
Description
The programmable SH3001 MicroBuddy™ (µBuddy™)
provides mandatory microcontroller support functions:
♦ Clock Management System
♦ Real-Time Support
♦ Auxiliary functions
Three components make a complete system: any
microcontroller, the SH3001, 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 crystal, raises the clock
frequency accuracy to ± 0.0256% (± 256 ppm).
The SH3001 can operate completely stand-alone, or
under control of the microcontroller. A single-wire
interface handles bi-directional communications. The
SH3001 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 nonvolatile 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 can also be connected to the
SH3001. 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
SH3001 MicroBuddy™
Real-Time Clock and Clock Management
Support IC for Microcontrollers
Features
♦ Highly integrated IC
- 3 mm x 3 mm x 0.9 mm 16-lead MLP (QFN) package
♦ Clock Management System
- Replaces high-frequency (HF) crystal or resonator
- Programmable clock output from 32.768 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 32.768 kHz buffered clock output
- Built-in trim for 32.768 kHz oscillator to ± 4 ppm
- Programmable periodic interrupt / wakeup timer
♦ Operates from 2.3 V to 5.5 V
♦ IDD <850 µA / 2 MHz, <3 mA / 16 MHz, <10 µA / standby
♦ IBUP <2 µA / IBSB <50 nA (battery backup / standby)
Pin Configuration
16 15 14 13
VSS ¹
VREG ²
VDD 3
VBAK ⁴
µB^TM
12 _{TEST (VSS)}
11 _NC
SH3001 ¹⁰ NC
9 _NC
5678
V+
CBYPASS
VDD
XIN
XOUT
GPIO WITH INT
3mm MLP (QFN) Package
1
2
µB^TM
12
11
3
10
4 _SH3001 9
µController
GND
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.
Typical Application Circuit with High Clock Accuracy
2003-08-08 Copyright ©2002-2005 Semtech Corporation 1
SH3001 data sheet V1.15 www.semtech.com