Document
SH3000 MicroBuddy™ www.DataSheet4U.com 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 zinccarbon/alkaline, 2/3-cell mercury, 2/3/4-cell NiCd/NiMH, 1cell Li/Li+ batteries, or a super cap.
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
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Pin Configuration
CLKOUT CLKIN
15
Applications
♦ ♦ ♦ ♦ ♦ Home automation and security Consumer products Portable/handheld computers Industrial equipment Any microcontroller-based product V+ CBYPASS
VDD XIN XOUT GPIO WITH INT 16 15 14 13
NRESET
16
IO/INT
14
CLK32
13 12 11
VSS VREG VDD VBAK
1 2 3 4 5
µBTM SH3000
6 7 8
TEST (VSS) RST RREF
10 NRST 9
1 2 3 4
µBTM SH3000
5 6 7 8
12 11 10 9
µController
GND
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.
Typical Application Circuit with High Clock Accuracy 2005-08-08 Copyright ©2003-2005 Semtech Corporation 1
CLKSEL
XOUT
V1.15 www.semtech.com
VSS
XIN
SH3000 MicroBuddy™
www.DataSheet4U.com
SYSTEM MANAGEMENT
Description Ordering Information
SH3000IMLTR SH3000IMLTRT EVK-SH3000USB SH3000EK.pdf SH3000UM.pdf IC IC Evaluation kit Evaluation kit user manual User manual MLP 3 x 3 mm 16 pins, -40° C to +85° C MLP 3 x 3 mm 16 pins, -40° C to +85° C, Lead Free
Block Diagram
Microcontroller
VDD 32KHZ XIN XOUT RESET I/O PIN
V+
CLK32
CLKOUT
2
3
13
16
CLKIN
VREG
VDD
15
VBAK
4 Regulators & Battery Back-up
VSS
Clock Driver & Start/Stop Logic Post-scaler HF Oscillator & FLL
OTP Memory Calibration & Default Settings
1
VSS
8
XIN
Voltage Reference LF Oscillator XTAL Oscillator
RST
VDD Monitor Watchdog
Reset Drivers & Logic
11
NRST
5
XOUT
10 Control Logic
TEST
6
CLKSEL
Real Time Clock Select Logic RC Oscillator SH3000 µBuddy™ Periodic Interrupt / Wake-up Timer
12
7
RREF
Interrupt Serial I/O
IO/INT
9
14
Copyright ©2003-2005 Semtech Corporation
2
V1.15
www.semtech.com
SH3000 MicroBuddy™
www.DataSheet4U.com
SYSTEM MANAGEMENT
Pin Descriptions
Pin 1 2 3 4 5 6 Name VSS VREG VDD VBAK XIN XOUT Type Power Power Power Power Analog In Analog Out Function Ground, 0 V. All VSS pins and TEST (VSS) pin must be connected together. Output of internal Voltage Regulator, 2.2 V nominal. This pin can power external loads of <5 mA. If load is “noisy” it requires a bypass capacitor. May be left unconnected or used as a high logic level signal for CLKSEL pin (see below). Main power supply, +2.3 to +5.5 V. Backup power supply for real tim.