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SH3001 데이터시트 PDF




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부품번호 SH3001 기능
기능 Real-Time Clock and Clock Management Support IC for Microcontrollers
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SH3001 데이터시트, 핀배열, 회로
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




SH3001 pdf, 반도체, 판매, 대치품
SYSTEM MANAGEMENT
Functional Description
The SH3001 is a single-chip support system for
microcontrollers, microprocessors, DSPs and ASICs. It
consists of three major functional blocks, each block
having numerous enhancements over alternative
solutions.
The major modules are the Clock Management
System, the Real-Time Support, and the Auxiliary
functions.
The entire chip is controlled by the set of internal
registers and accessed via the single-pin serial interface.
All of the settings, configuration, and calibration or
operating parameters are programmable and re-
programmable at any time. All of the parameters
required for stand-alone operations are initialized on
reset from the built-in factory-programmed Nonvolatile
memory. This allows the SH3001 to operate
autonomously for most of its supervisory functions. The
stand-alone operations do not require the use of the
serial interface or any of the initialization and control
operation, but without these, the full potential benefit of
the SH3001 might not be realized.
In the preferred configuration, where the SH3001 is
tightly coupled to the target micro, the SH3001 offers an
unprecedented level of design flexibility in clock and
power usage management.
SH3001 MicroBuddy™
www.DataSheet4U.com
The SH3001 is a particularly desirable integration
because the built-in features interact and meld to
produce more useful system level functions.
The SH3001 offers several ways to minimize system
power consumption, such as allowing the target
processor to enter deep sleep by stopping its clock
completely, and to wake up as often as necessary with
no external support. The clock can be programmed to
start up at a given frequency, and software can adjust it
dynamically to manage power consumption and different
operating modes.
Users should consider the interactions of the major
functional blocks to gain the maximum advantage from
the SH3001.
The individual functional blocks are described in the
following sections.
Copyright ©2002-2005 Semtech Corporation
4
V1.15 www.semtech.com

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SH3001 전자부품, 판매, 대치품
SYSTEM MANAGEMENT
Special Operating Modes
The SH3001 can operate stand-alone, without
connections to the In and Out terminals of the host’s
oscillator. For example, a bank of SH3001 chips can
generate several different frequencies for simultaneous
use in the system, all controlled by a single micro (and
possibly sharing one 32.768 kHz crystal by chaining the
CLK32 pin to XIN pin on the next device). In this case
the CLKIN pin should be connected to VSS. The clock
output on the CLKOUT pin is continuous; the correct
operating mode is automatically recognized by the
SH3001.
Real-Time Support
The SH3001 has two support modules that are
specifically designed for various real time support
functions. They are the Real-Time Clock and the
Periodic Interrupt / Wakeup Timer. Both of these units
as well as other functions of the SH3001 depend on the
internal 32.768 kHz clock for accuracy.
With one external component (a 32.768 kHz crystal),
the SH3001 can provide a processor clock accuracy of
± 256 ppm (± 0.0256%) and the accuracy of the real-
time system of ± 4 ppm (± 0.0004%).
SH3001 MicroBuddy™
www.DataSheet4U.com
A microcontroller might not have a STOP command.
With the SH3001, this controller can do a “simulated”
STOP by issuing an instruction to the SH3001 to stop
the clock. This command is accepted only if the Periodic
Interrupt / Wakeup Timer has started (otherwise, once
the system is put to sleep, it would never wake up
again). This mode of operations is only possible if the
host processor is capable of correct operations with
clock frequency down to zero, and keeps all of the
internal RAM alive while the clock is stopped.
Low Frequency (LF) Oscillator System
This module provides the 32.768 kHz clock to all
internal circuits and to the dedicated output pin, CLK32.
If enabled, the CLK32 output continues normal
operations when VDD is absent and backup power is
available.
When the power is first applied to the SH3001, the
RC oscillator takes over. It supplies the 32.768 kHz
clock for start-up and initialization. Once the crystal has
started and stabilized, the internal 32.768 kHz clock
switches to the very accurate crystal frequency; see
Figure 2.
32.768 kHz
Crystal
12.5 pF Load
Capacitance
VREG
XIN
5
XOUT
6
CLKSEL
7
VSS Lock / Unlock
8
Logic
4-bit Value
VSS
1
X-tal stable?
INTERNAL
RREF ON
RC
Oscillator
Internal RREF
6-bit Value 4-bit Value Lock Logic
Figure 2. Simplified LF Oscillator System
Copyright ©2002-2005 Semtech Corporation
7
CLK32 ON
Internal
32.768 kHz
Clock
CLK32
13
From / To
Serial I/O
V1.15 www.semtech.com

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