sh3001imltrt Semtech Corporation, sh3001imltrt Datasheet

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sh3001imltrt

Manufacturer Part Number
sh3001imltrt
Description
Sh3001 Microbuddy Real-time Clock And Clock Management Support Ic For Microcontrollers
Manufacturer
Semtech Corporation
Datasheet
Description
The programmable SH3001 MicroBuddy™ (µBuddy™)
provides mandatory microcontroller support functions:
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).
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).
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
2003-08-08
SYSTEM MANAGEMENT
Typical Application Circuit with High Clock Accuracy
V+
Three components make a complete system: any
The SH3001 can operate completely stand-alone, or
A backup power source can also be connected to the
Home automation and security
Consumer products
Portable/handheld computers
Industrial equipment
Any microcontroller-based product
C
Clock Management System
Real-Time Support
Auxiliary functions
BYPASS
1
2
3
4
SH3001
Copyright ©2002-2005 Semtech Corporation 1
B
TM
12
11
10
9
V
X
GPIO
G
DD
X
OUT
ND
IN
Controller
WITH
INT
Real-Time Clock and Clock Management
Features
Pin Configuration
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.
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
I
I
DD
BUP
<850 A / 2 MHz, <3 mA / 16 MHz, <10 A / standby
<2 A / I
SH3001 data sheet V1.15
V
V
Support IC for Microcontrollers
V
V
BAK
REG
SS
DD
3mm MLP (QFN) Package
BSB
1
2
3
4
<50 nA (battery backup / standby)
16
5
SH3001
SH3001 MicroBuddy™
15
6
B
14
TM
7
13
8
12
11
10
9
www.semtech.com
NC
NC
NC
T
EST
(V
SS
)

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sh3001imltrt Summary of contents

Page 1

... SH3001 V 4 BAK 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. SH3001 data sheet V1. EST ...

Page 2

... SYSTEM MANAGEMENT Description Ordering Information SH3001IMLTR IC SH3001IMLTRT IC EVK-SH3000USB SH3000 evaluation kit SH3000EK.pdf SH3000 Evaluation Kit User Guide SH3000UM.pdf SH3000 Reference Manual Block Diagram BAK 4 Regulators & Battery Back- Voltage V SS Reference 8 LF Oscillator Oscillator X OUT 6 CLK SEL 7 Copyright ©2002-2005 Semtech Corporation ...

Page 3

... Connect to the microcontroller’s clock output or IN oscillator output pin. Connect to V Programmable high frequency clock output. Connect to the target microcontroller’s clock 16 CLK Digital Out OUT input or oscillator input pin. Keep open if not used. Copyright ©2002-2005 Semtech Corporation pins and EST REG pins and ...

Page 4

... 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. Copyright ©2002-2005 Semtech Corporation SH3001 MicroBuddy™ The SH3001 is a particularly desirable integration because the built-in features interact and meld to produce more useful system level functions ...

Page 5

... Frequency Set value From / To Serial I/O Copyright ©2002-2005 Semtech Corporation 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 ...

Page 6

... OUT OSC For example, a post-divider setting of Frequency Set value of 4000 (0x0FA0) produce an output frequency of 1.024 MHz. Copyright ©2002-2005 Semtech Corporation Programmable Spectrum Spreading pin to OUT Most commercial electronic systems must pass regulatory tests in order to determine the degree of their Electromagnetic Interference (EMI) affecting other electronic devices ...

Page 7

... Logic Copyright ©2002-2005 Semtech Corporation 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) ...

Page 8

... LSB Figure 3. Real Time Clock and Periodic Interrupt / Wakeup timer Copyright ©2002-2005 Semtech Corporation Real-Time Clock Using the ± 4 ppm, 32.768 kHz clock from the LF oscillator, the Real-Time Clock module keeps time with a maximum error as low as 2 minutes per year. This compares favorably with a conventional error of 2 minutes per month for typical RTC chips ...

Page 9

... The whole 32-bit value is loaded into the 32-bit Current Timer Value latch when the least significant byte is read. This prevents errors stemming from the finite time between the readings of individual bytes of the current value. Copyright ©2002-2005 Semtech Corporation SH3001 MicroBuddy™ Auxiliary functions Voltage Regulator Pin V can be used as a nominal 2 ...

Page 10

... The value of a guard bit does not matter. The 8-bit data field is written to (read from) the register. Copyright ©2002-2005 Semtech Corporation SH3001 MicroBuddy™ Two parity bits: The first parity bit is high when there are an odd number of bits in the read/write, address and data fields ...

Page 11

... SYSTEM MANAGEMENT Copyright ©2002-2005 Semtech Corporation Figure 4: Serial Communication Timing Diagram 11 SH3001 MicroBuddy™ V1.15 www.semtech.com ...

Page 12

... Supply current, CLK = 2 MHz* OUT Standby current, 32.768 kHz crystal** Backup Supply Voltage** Backup current, 32.768 kHz crystal** Backup standby current** *Note: Assuming load on CLK OUT **Note: Assuming temperature < 60ºC Copyright ©2002-2005 Semtech Corporation Symbol relative to ground ...

Page 13

... Minimum spread spectrum range Maximum spread spectrum range CLK rise/fall time (20 pF load) OUT CLK logic output low (4 mA load) OUT CLK logic output high (4 mA load) OUT Copyright ©2002-2005 Semtech Corporation SH3001 MicroBuddy™ Symbol Min Typ Fop 32.768 DC 25 Tst Cmin ...

Page 14

... SYSTEM MANAGEMENT Copyright ©2002-2005 Semtech Corporation SH3001 MicroBuddy™ 14 V1.15 www.semtech.com ...

Page 15

... SYSTEM MANAGEMENT Copyright ©2002-2005 Semtech Corporation SH3001 MicroBuddy™ 15 V1.15 www.semtech.com ...

Page 16

... SYSTEM MANAGEMENT Copyright ©2002-2005 Semtech Corporation SH3001 MicroBuddy™ 16 V1.15 www.semtech.com ...

Page 17

... SYSTEM MANAGEMENT Copyright ©2002-2005 Semtech Corporation SH3001 MicroBuddy™ 17 V1.15 www.semtech.com ...

Page 18

... SYSTEM MANAGEMENT Copyright ©2002-2005 Semtech Corporation SH3001 MicroBuddy™ 18 V1.15 www.semtech.com ...

Page 19

... SYSTEM MANAGEMENT Package Outline Drawing MLP pins Copyright ©2002-2005 Semtech Corporation SH3001 MicroBuddy™ 19 V1.15 www.semtech.com ...

Page 20

... Telephone (805)498-3804 Fax Copyright ©2002-2003 Semtech Corporation. All rights reserved. Semtech, the Semtech logo, MicroBuddy, µBuddy, and µB are marks of Semtech Corporation. All other marks belong to their respective owners. LIMITED LICENSE GRANTED: NO WARRANTIES MADE This specification is provided "as is" with no warranties ...

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