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Part: SH3001
Category:
Microcontrollers
-> MicroBuddy™ Multifunction for Microcontroller
Description: MicroBuddy™ Real-time Clock And Clock Management Support ic For Microcontrollers
Company: Semtech Corporation
Datasheet: Download SH3001 datasheet File size : 363 kB
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Datasheet text preview:
SH3001 MicroBuddyTM Real-Time Clock and Clock Management Support IC for Microcontrollers
SYSTEM MANAGEMENT
Description
The programmable SH3001 MicroBuddyTM (µBuddyTM) 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 zinccarbon/alkaline, 2/3-cell mercury, 2/3/4-cell NiCd/NiMH, 1cell Li/Li+ batteries, or a super cap.
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 mA / 2 MHz, <3 mA / 16 MHz, <10 mA / standby IBUP <2 mA / IBSB <50 nA (battery backup / standby)
¨
¨ ¨ ¨
Pin Configuration
CLKOUT IO/INT
14
16
15
CLK32
13 12 11 10 9
CLKIN
VSS VREG VDD VBAK
1 2 3 4 5
mB
TM
TEST (VSS) NC NC NC
Applications
¨ ¨ ¨ ¨ ¨ V+ CBYPASS
VDD XIN XOUT GPIO WITH INT 16 15 14 13
3mm MLP (QFN) Package
1 2 3 4
mB
TM
SH3001
5 6 7 8
12 11 10 9
mController
GND
Typical Application Circuit with High Clock Accuracy 2003-03 Copyright ©2002-2003 Semtech Corporation 1
Semtech, the Semtech logo, MicroBuddy, µBuddy, and µB are marks of Semtech Corporation. All other marks belong to their respective owners.
SH3001 data sheet V1.10
C L KS E L
XOUT
VSS www.semtech.com
Home automation and security Consumer products Portable/handheld computers Industrial equipment Any microcontroller-based product
SH3001
6 7 8
XIN
SH3001 MicroBuddyTM
SYSTEM MANAGEMENT
Description Ordering Information
SH3001IMLTR EVK-SH3000USB SH3000EK.pdf SH3000UM.pdf IC SH3000 evaluation kit SH3000 Evaluation Kit User Guide SH3000 Reference Manual MLP 3 x 3 mm, 16 pins, temp. range -40° C to +85° C
Block Diagram
Microcontroller
VDD 32.768 K HZ XIN XOUT I/O PIN
V+
CLK32
CLKOUT
VREG
2
VDD
3
13
16
CLKIN
15
VBAK
4 Regulators & Battery Back-up
VSS
Clock Driver & Start/Stop Logic Post-scaler HF Oscillator & FLL
Nonvolatile Memory
TEST
1
VSS
Calibration & Default Settings
NC
11
NC
8
XIN
Voltage Reference LF Oscillator XTAL Oscillator
10
NC
5
XOUT
9 Control Logic Real-Time Clock Periodic Interrupt / Wake-up Timer
TEST
6
CLKSEL
12
7
Interrupt Serial I/O
IO/INT
14
SH3001 µBuddyTM
Copyright ©2002-2003 Semtech Corporation
2
V1.10
www.semtech.com
SH3001 MicroBuddyTM
SYSTEM MANAGEMENT
Pin Descriptions
Pin 1 2 3 4 Name VSS VREG VDD VBAK Type Power Power Power Power 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-time clock, +2.3 to +5.5 V (+1.8 to +5.5 V typical). This voltage can be higher or lower than VDD. Connect a backup battery or backup capacitor (with external recharge circuit). Connect to VDD if not used. Oscillator pins for optional external low frequency crystal, typically 32.768 kHz crystal with nominal 12.5 pF load capacitance. Keep open or connect to VSS if not used. Must be tied to VREG Ground, 0 V. All VSS pins and TEST (VSS) pin must be connected together. Not connected - reserved Not connected - reserved Not connected - reserved Factory test enable. All VSS pins and TEST (VSS) pin must be connected together. Buffered internal 32.768 kHz clock, derived according to the CLKSEL pin setting. This pin uses backup power for the buffer when VDD is not present. When driving high, this signal is either at VBAK or VDD (if VDD is higher than the reset threshold). When enabled, this signal runs continuously independent of CLKOUT activity. Minimize the external load to reduce power consumption during backup operations. When disabled, this pin is driven to VSS. Keep open if not used. Serial communications interface and interrupt output pin. This pin is internally weakly pulled to the opposite of the programmed interrupt polarity. For example, if interrupt is programmed to be active low, this pin is weakly pulled to VDD when inactive. Keep open if not used. Clock activity sense input. Used to detect when the target microcontroller enters stop mode (which disables its clock). Connect to the microcontroller's clock output or oscillator output pin. Connect to VSS when not used. CLKIN must not be left open. Programmable high frequency clock output. Connect to the target microcontroller's clock input or oscillator input pin. Keep open if not used.
5 XIN Analog In 6 XOUT Analog Out 7 CLKSEL Digital In 8 VSS Power 9 NC 10 NC 11 NC 12 TEST (VSS) Digital In
13
CLK32
Digital Out
14
IO/INT
I/O
15 16
CLKIN CLKOUT
Digital In Digital Out
Copyright ©2002-2003 Semtech Corporation
3
V1.10
www.semtech.com
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