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PDF SH3001 Data sheet ( Hoja de datos )
| Número de pieza | SH3001 | |
| Descripción | Real-Time Clock and Clock Management Support IC for Microcontrollers | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SH3001 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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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 Clwowcwk.DaMtaaShneeat4gUe.cmoment
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
µBTM
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
µBTM
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
1 page  
SYSTEM MANAGEMENT
Clock Management System
The SH3001 provides a flexible tool for creating and
managing clocks, a versatile and accurate “any
frequency” clock synthesizer (see Figure 1).
It is capable of generating any frequency in the
range of 62.5 kHz to 16.0 MHz, with worst-case
resolution of 0.0256% (256 ppm). The internal
32.768 kHz clock can also be routed to the CLKOUT pin
(and HF oscillator stopped for energy savings).
The objectives, features, and behavior of the Clock
Management System are aimed towards the systems
that utilize a microcontroller, a microprocessor, a DSP or
an ASIC.
The SH3001 permits the automatic sensing of the
intentions of the host processor, an industry first. The
SH3001 shuts down its clock output when it senses that
the host processor issued a STOP instruction.
Subsequently, the SH3001 idles, consuming less than
10 µA. As soon as the host exits the STOP mode, the
SH3001 instantaneously starts to supply a stable clock
(<2µs wake-up).
A typical system, constructed with a ceramic
resonator or a crystal as the frequency determining
element, must wait at least several hundred
microseconds (for a resonator), or as much as 100 ms or
more (for a HF crystal), to re-start the oscillator. The
SH3001 allows the response to and service of an event
to finish with a speed previously unattainable for a
simple microprocessor. A system with a traditional clock
approach can be as much as 100x – 10,000x slower.
SH3001 MicroBuddy™
www.DataSheet4U.com
Clock Generator Operation
The frequency synthesizer in the SH3001 is
constructed from the 2:1 tunable 8.0 –16.0 MHz HF
oscillator followed by a programmable “power-of-two”
post-divider (see Figure 1).
The Clock Source selector and the programmable
post-scale divider allow instantaneous switching
between the 32.768 kHz internal clock and divided-down
HF oscillator output. There is no settling or instability
when the switch occurs.
This is a preferred method for clock control in
computing systems, when the large ratio between high
and low frequency of operations allows for
correspondingly large and instantaneous savings in
power consumption.
32.768 kHz
FLL On
Frequency Locked Loop
÷ 2048 Hz
16
Logic
Clock Source
Clock On
Post-scaler
(Divide by 1, 2, 4,
8, 16, 32, 64, 128)
1
0
18-bit
DCO Code
Register
Clock Buffer
and Glue
Logic
CLKOUT
16
CLKIN
15
START/STOP
HF Digitally
Controlled
Oscillator
8-16 MHz
Force
DCO On
From / To
Serial I/O
13-bit
Frequency
Set value
8-bit Pseudo-
Random Noise
Generator
Figure 1. Simplified HF Oscillator System
Spectrum
Spreading
Controls
Copyright ©2002-2005 Semtech Corporation
5
V1.15 www.semtech.com
5 Page 
SYSTEM MANAGEMENT
SH3001 MicroBuddy™
www.DataSheet4U.com
Figure 4: Serial Communication Timing Diagram
Copyright ©2002-2005 Semtech Corporation
11
V1.15 www.semtech.com
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet SH3001.PDF ] | |
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