SH3002 Datasheet, PDF (1/22 Pages) Semtech Corporation – Reset Management and Clock Management Support IC for Microcontrollers

SYSTEM MANAGEMENT
SH3002 MicroBuddy™
Reset Management and Clock Management
Support IC for Microcontrollers
Description
The programmable SH3002 MicroBuddy™ (µBuddy™)
provides mandatory microcontroller support functions:
♦ CPU Supervisor
♦ Clock Management System
♦ Auxiliary functions
Three components make a complete system: any
microcontroller, the SH3002, and a bypass capacitor.
This low-cost system would consume very little power and
have clock-frequency accuracy of ± 0.5%.
The SH3002 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 SH3002. The
SH3002 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).
Applications
♦ Home automation and security
♦ Consumer products
♦ Portable/handheld computers
♦ Industrial equipment
♦ Any microcontroller-based product
Features
♦ Highly integrated IC
- 3 mm x 3 mm x 0.9 mm 16-lead MLP (QFN) package
♦ CPU Supervisor
- Low VDD reset programmable from 2.3 V to 4.3 V
- Both active-high and active-low reset outputs
♦ 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
♦ Operates from 2.3 V to 5.5 V
- Ideal for battery-operated devices
♦ IDD <850 µA / 2 MHz, <3 mA / 16 MHz, <10 µA / standby
Pin Configuration
16 15 14 13
VSS ¹
VREG ²
VDD ³
NC ⁴
µB^TM
12 _{TEST (VSS)}
11 _RST
SH3002
10 _NRST
9 _RREF
5678
V+
CBYPASS
1
2
µB^TM
12
11
3
10
4 _SH3002 9
VDD
XIN
XOUT
GPIO WITH INT
NRESET
µController
GND
3mm MLP (QFN) Package
Typical Application Circuit
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 ©2002-2005 Semtech Corporation 1
SH3002 data sheet V1.20 www.semtech.com