S-3531A S-3531A CMOS real-time clock supporting CBUS, which desig
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REAL-TIME CLOCK
S-3531A
S-3531A CMOS real-time clock supporting CBUS, which designed transfer each data clock calender requested CPU. provides connection with wires systems interrupt/alarm clock output features, allowing alleviation software treatment side host. also works lower power with oscillating circuit operated constant voltage.
Features
power consumption: typ. (VDD=3.0 Wide area operating voltage: input/output year, month, day, week, hour, minute second interface wires C-BUS) Auto calender till year 2,099 (automatic leap year arithmetic feature included) Built-in power voltage detecting circuit Built-in constant voltage circuit Built-in flag generating circuit power on/off Built-in alarm interrupter (two systems) Steady-state interrupt frequency/duty setting feature Built-in crystal oscillating circuit (Internal External
Applications
Cellular phone variety pagers Camera
Package 8-Pin SSOP (pin pitch 0.65 (Package drawing code FS008-A)
Seiko Instruments Inc.
REAL-TIME CLOCK S-3531A Block Diagram
Rev.1.3_00
XOUT
Oscillating circuit
Timing generation
INT1 Register
Clock generating circuit
Comparator
INT1
F32K
Second Minute
Hour
week
Month
Year
Power voltage detecting circuit Constant voltage circuit
Status register
Shift register
C-BUS Interface
Figure
Seiko Instruments Inc.
Rev.1.3_00 Product Code Structure
S-3531AE
REAL-TIME CLOCK S-3531A
direction tape specifications Package name (abbreviation) 8-Pin SSOP Description (fixed)
Seiko Instruments Inc.
REAL-TIME CLOCK S-3531A Assignment
Package: S-3531AEFS 8-Pin SSOP view INT1 XOUT Figure F32K
Rev.1.3_00
S-3531AECA
INT1 XOUT S-3531A
F32K
Remark
size
size
2.10 1.60 Sizes shown design purposes only. corners shrink approximately after dicing.
Coordinates Symbol INT1 XOUT -890 -890 -890 -890 -114 -641 Symbol F32K -240 -641
Figure
Seiko Instruments Inc.
Rev.1.3_00 Description Pins
Symbol INT1 Table Description Alarm interrupt output pin. Depending mode INT1
REAL-TIME CLOCK S-3531A
Configuration open drain output protective diode
register status register, outputs side VDD) Clock when time reached. disabled rewriting status register. XOUT F32K Crystal oscillator connect (32,768 (Internal External Negative power supply (GND) open drain output 32,768 clock output pin. This clock always being output cannot protective diode controlled command. side VDD) CMOS input protective Serial clock input pin. Follow specification with great care diode side VDD) rising/falling time signal because signal treated rising/falling edge. open drain output Serial data input/output pin. protective diode This usually pulled side VDD) resistor, connected other open-drain CMOS input open-collector output devices wired configuration. Positive power supply pin.
Seiko Instruments Inc.
REAL-TIME CLOCK S-3531A Absolute Maximum Ratings
Item Symbol Table Applicable pin, conditions Rating
Rev.1.3_00
Unit
Power voltage VSS-0.3 VSS+6.5 Input voltage Applied SCL, VSS-0.3 VDD+0.3 Output voltage VOUT Applied SDA, INT1, F32K VSS-0.3 VDD+0.3 Operating temperature Topr VDD=3.0 +125 Storage temperature Tstg Caution absolute maximum ratings rated values exceeding which product could suffer physical damage. These values must therefore exceeded under conditions.
Recommended Operating Conditions
Item Power voltage Operating temperature
Symbol
Table Condition
Min.
Typ.
Max.
Unit
Topr
Oscillation Characteristics
Table
(Unless otherwise specified Ta=25°C, VDD=3 DS-VT-200 (crystal oscillator, CL=6 32,768 manufactured Quartz Techno Ltd.)
Item Oscillation start voltage Oscillation start time IC-to-IC frequency diversity Frequency voltage diversity Input capacity Output capacity
Symbol VSTA TSTA
Condition Within seconds VDD=1.7 Applied Applied XOUT
Min.
Typ.
Max.
Unit ppm/V
Seiko Instruments Inc.
Rev.1.3_00 Electrical Characteristics
Table characteristics
REAL-TIME CLOCK S-3531A
(Unless otherwise specified Ta=25°C, VDD=3 DS-VT-200 (crystal oscillator, CL=6 32,768 manufactured Quartz Techno Ltd.)
Item Operating voltage range Current consumption Current consumption Input leak current Input leak current Output leak current1 Output leak current2 Input voltage Input voltage Output current Output current Power voltage detection voltage Power voltage detection voltage
Symbol IDD1 IDD2 IIZH IIZL IOZH IOZL IOL1 IOL2 VDET1 VDET2
Applicable SCL, SCL, INT1, F32K, INT1, F32K, SDA, SDA, INT1, F32K
Condition +70°C During communications During communications (SCL=100 kHz) VIN=VDD VIN=VSS VOUT=VDD VOUT=VSS VOUT=0.4 VOUT=0.4 Ta=+25°C +70°C
Min. -0.5 -0.5 -0.5 -0.5 1.72
Max.
Unit
Table characteristics
(Unless otherwise specified Ta=25°C, VDD=3 DS-VT-200 (crystal oscillator, CL=6 32,768 manufactured Quartz Techno Ltd.)
Item Operating voltage range Current consumption Current consumption Input leak current Input leak current Output leak current1 Output leak current2 Input voltage Input voltage Output current Output current Power voltage detection voltage Power voltage detection voltage
Symbol IDD1 IDD2 IIZH IIZL IOZH IOZL IOL1 IOL2 VDET1 VDET2
Applicable SCL, SCL, INT1, F32K, INT1, F32K, SDA, SDA, INT1, F32K
Condition +70°C During communications During communications (SCL=100 kHz) VIN=VDD VIN=VSS VOUT=VDD VOUT=VSS VOUT=0.4 VOUT=0.4 Ta=+25°C +70°C
Min. -0.5 -0.5 -0.5 -0.5 1.72
Max.
Unit
Seiko Instruments Inc.
REAL-TIME CLOCK S-3531A Electrical Characteristics
Table Measurement conditions Input pulse voltage Input pulse rising/falling time Output judgement voltage Output load pF+1.0
Rev.1.3_00
R=1.0 C=100
Caution
Both load powers same Figure Output load circut
Table properties Item clock frequency clock time clock time output delay time Start condition setup time Start condition holding time Data input setup time Data input holding time Stop condition setup time SCL, rising time SCL, falling time release time Noise suppression time Symbol fSCL tLOW tHIGH tSU, tSTA tHD, tSTA tSU, tDAT tHD, tDAT tSU, tSTO tBUF VDD=1.7 Min. Typ. Max. Unit
tSU, tSTA tHD, tSTA
tHIGH
tLOW
tHD, tDAT
tSU, tDAT
tSU, tSTO
tBUF
Figure timing
Seiko Instruments Inc.
Rev.1.3_00 Description Operation
Serial interface
REAL-TIME CLOCK S-3531A
S-3531A receives various commands through C-BUS-based serial interface read/write data. method C-BUS-based transfer described here. Start condition Changing line from when line activates start condition. operations begin start condition. Stop condition Changing line from when line activates stop condition. During read sequence, read operation stopped device enters stand-by mode when stop condition received.
tSU, tSTA tHD, tSTA tSU, tSTO
Start condition Stop condition
Figure Start/Stop condition Data transfer When line changed while line "L", data transfer performed. When line changed while line "H", start stop condition recognized.
tSU, tDAT tHD, tDAT
Figure Data transfer timing
Seiko Instruments Inc.
REAL-TIME CLOCK S-3531A
Rev.1.3_00
Acknowledge Data transfer performed 8-bit sequence. device system bus, which succeedingly receives data during period ninth clock cycle, puts line returns acknowledge signal meaning that data been received.
(S-3531A input)
(Master output) Acknowledge output Start condition
(S-3531A output)
Figure Acknowledge output timing
Device addressing master device system generates start condition slave device make communication. continuously issues device address 4-bit length, command 3-bit length read/write command 1-bit length over bus. upper four bits, called device code, represent device address fixed "0110."
Device code
Command
Read/Write
Figure Communication data Command configuration There seven kinds commands which read/write operation various registers performed. table below lists them. send code other than listed codes, command ignored. Table Command list Description Reset (year), (month), (day), (day week), (minute), (second)) Status register access Real-time data access (year data Real-time data access (hour data Alarm time/frequency duty setting (for INT1 pin) Test mode start Test mode
Number
Don't care this command. This command access-disabled specific test.
Seiko Instruments Inc.
Rev.1.3_00
REAL-TIME CLOCK S-3531A
Data reading After start condition detected from outside, device code command received. this point, real-time reading mode status register reading mode entered when read/write "1". either real-time reading mode status register reading mode, data output order from LSB. Real-time data reading
LINE DEVICE Command ADDRESS Year data Second data from Master Device
Real-time data access command
Real-time data reading
LINE DEVICE Command ADDRESS Hour data Second data from Master Device
Real-time data access commands
Status register reading
LINE DEVICE Command ADDRESS Status data from Master Device
Status register access command
Figure Read communication
Caution
Upside: Downside:
Generate from master device Generate from S-3531A
Seiko Instruments Inc.
REAL-TIME CLOCK S-3531A
Rev.1.3_00
Data writing After start condition detected from outside, device code command received. this point, real-time data writing mode other register writing mode entered when read/write "0". Data must entered order from real-time data writing mode status register writing mode. real-time data writing, counter calender time reset when signal rises following real-time writing command, update operation disabled. After minute data received, month corrected while second data imported. Then, count-up started when signal rises after second data received. Real-time data writing
LINE DEVICE Command ADDRESS Year data Second data
Real-time data access command
Real-time data writing
LINE DEVICE Command ADDRES Hour data Second data
Real-time data access commands
Status register writing
LINE DEVICE Command ADDRESS Status data
Status register access command
Figure Write communication
Seiko Instruments Inc.
Rev.1.3_00
Regiter configuration
REAL-TIME CLOCK S-3531A
Real-time data register real-time data register 56-bit register which stores code data year, month, day, week, hour, minute second. read/write operation performed real-time data access command sends receives data from first digit year data.
Year data Sets lower digits Christian links together with auto calender feature till 2,099. Month data count value automatically changed auto calender feature: (leap year): (common year): data
week data septenary counter. that corresponds week.
Hour data AM/PM 12-hour expression, 0:AM 1:PM. 24-hour expression, this flag meaning either must written.
Minute data
TEST
Second data test flag TEST Turns during test mode.
Figure
Seiko Instruments Inc.
REAL-TIME CLOCK S-3531A
Rev.1.3_00
Status register status register 8-bit register which allows display various modes. POWER flag read-only others read/write-enabled.
POWER 12/24 INT1AE INT1ME INT1FE
Figure
B7:POWER
This flag turns power voltage detecting circuit operates during poweron changes power voltage (below VDET). Once turning "1", this flag does turns back even when power voltage reaches exceeds detection voltage. When flag "1", must send reset command status register read command) turn "0". read-only flag. This flag used 12-hour 24-hour expression. 12-hour expression 24-hour expression
B6:12/24
B5:INT1AE
This flag used choose state INT1 output with alarm interrupt output set. Enable this flag after setting alarm time that forms meeting condition INT1 register: Alarm interrupt output disabled. Alarm interrupt output enabled.
B3:INT1ME
This flag used make output INT1 per-minute edge interrupt per-minute steady interrupt. make output per-minute steady interrupt, INT1ME INT1FE Alarm interrupt selected frequency steady interrupt output Per-minute edge interrupt per-minute steady interrupt output
B1:INT1FE
This flag used make output INT1 per-minute steady interrupt output period minute, duty) selected frequency steady interrupt. Note that INT1 register considered data frequency/duty selected frequency steady interrupt chosen. Alarm interrupt per-minute edge interrupt output Per-minute steady interrupt selected frequency steady interrupt output
B4,B2,B0:
Non-used bits; They ignored during data writing. Indefinite data ("0" "1") read during data reading.
Seiko Instruments Inc.
Rev.1.3_00
REAL-TIME CLOCK S-3531A
Alarm time/Frequency duty setting register There types alarm time/frequency duty setting registers, 16-bit registers, which alarm time frequency duty. They switched INT1AE INT1FE register. AM/PM flag must accordance with 12-hour 24-hour expression. AM/PM flag rightly then hour data alarm data. alarm time/frequency duty setting register write-only register. When INT1AE
INT1 register
Figure INT1 register (alarm) INT1 register considered alarm time data. Having same configuration time minutes registers real-time data register configuration, represents hours minutes with codes. When setting them, none-existent day. Data must accordance with 12-hour 24-hour expression that status register. When INT1FE INT1 register considered frequency duty data. turning each registers "1", frequency corresponding each chosen ANDed form.
INT1 register
32768 16384 8192 4096
2048 1024
Figure INT1 register (frequency duty)
Seiko Instruments Inc.
REAL-TIME CLOCK S-3531A
Example
000A
Rev.1.3_00
INT1 output
selected frequency steady interrupt output
Figure Clock output Test flag test flag 1-bit register which assigned second data real-time data register. transferred data considered test mode starting command receiving test mode starting command noises, set. When set, must send test mode ending command reset command. Initialization Note that S-3531A different initializing operations, depending states. When power turned When power turned status register "82h" INT1 register "8000h" power-on detecting circuit. other words, (POWER flag) status register clock output from INT1 pin. This provided adjust oscillating frequencies. normal use, reset command must sent when power turned Real-time data register (year), (month), (day), (day week), (hour), (minute), (second) Status register "82h" INT1 register "8000h" When power voltage detecting circuits operates power voltage detecting circuit included S-3531A operates sets (POWER flag) internal status register when power turned power voltage reduced. Once set, held even after power voltage gets equal higher than detection voltage, i.e., power voltage detector threshold. When flag "1", must send reset command from initialize flag. this point, other registers change, however, POWER flag during power-on reset (S-3531A does reach indefinite area during backup), have send reset command.
Seiko Instruments Inc.
Rev.1.3_00
When reset command received When reset command received, each register turns follows:
REAL-TIME CLOCK S-3531A
Real-time data register (year), (month), (day), (day week), (hour), (minute), (second) Status register "00h" INT1 register "0000h"
POWER flag DEVICE command ADDRESS LINE
DEVICE command ADDRESS
POWER flag
Don't care reset command
status access command
status data
backup state (S-3531A does reach indefinite area)
POWER flag DEVICE command ADDRES
DEVICE command ADDRESS
down
POWER flag
status access command
status data
real-time data access command
Figure Initializing
Seiko Instruments Inc.
REAL-TIME CLOCK S-3531A
Processing none-existent data end-of-month When writing real-time data, validate treat invalid data end-of-month correction. [None-existent data processing] Table None-existent data processing Register Normal data Error data Result
Rev.1.3_00
Year data Month data data week data Hour data (24-hour) (12-hour) Minute data Second data 12-hour expression, write AM/PM flag. AM/PM flag ignored 24-hour expression, o'clock o'clock read read operation. None-existent data processing second data performed carry pulse second after writing. this point, carry pulse sent minute counter. [End-of-month correction] none-existent corrected first next month. example, February changed March Leap-year correction also performed here.
Seiko Instruments Inc.
Rev.1.3_00
Interrupt
REAL-TIME CLOCK S-3531A
There different five output formats from INT1 pin, which chosen INT1AE, INT1ME INT1FE bits status register Alarm interrupt output Alarm interrupt enabled setting hour minute data INT1 register turning status register's INT1AE INT1ME INT1FE When hour data met, output from INT1 pin. Since output held, rewrite INT1AE status register through serial communication turn output (OFF state). When perform disable enable communication while corresponding signal being retained (for minute), signal output from INT1 again. Selected frequency steady interrupt output When frequency/duty data INT1 register turn status register's INT1ME INT1FE "1", clock INT1 register output from INT1 pin. Per-minute edge interrupt output When first minute carry performed after status register's INT1ME with INT1FE with output from INT1 pin. Since output held, rewrite INT1AE, INT1ME INT1FE status register through serial communication turn output (OFF state). When perform disable enable communication while minute carry processing signal being retained (for ms), signal output from INT1 again. Per-minute steady interrupt output When first minute carry performed after status register's INT1ME INT1FE with clock output from INT1 with period minute (50% duty). When perform disable enable communication while INT1 "L", signal output from INT1 again. Caution1. changing output mode, give care state INT1 register output. per-minute edge interrupt output per-minute steady interrupt output chosen, INT1 register meaning. Table Interrupt description INT1AE INT1ME INT1FE Description Output disabled interrupt output) Selected frequency steady interrupt output Per-minute edge interrupt output Per-minute steady interrupt output Alarm interrupt output Remark Don't care
Seiko Instruments Inc.
REAL-TIME CLOCK S-3531A
Alarm interrupt output
Change program INT1A INT1ME=INT1FE=0 INT1 Alarm time corresponds Alarm time corresponds
Rev.1.3_00
signal output again case minute less
Selected frequency steady interrupt output
Change program INT1FE INT1AE=INT1ME=0 INT1 Free output starts
Per-minute edge interrupt output
Change program INT1ME INT1AE=INT1FE=0 INT1 signal output again case less Minute-carry processing Minute-carry processing
Per-minute steady interrupt output
Change program (OFF)
INT1FE,INT1ME INT1AE=0 INT1
Minute-carry processing
Minute-carry processing
Minute-carry processing
Minute-carry processing
Minute-carry processing
signal output again case less.
signal output case more. signal output next minute-carry processing.
During power-on detecting circuit operation
Change reset command INT1FE INT1AE=INT1ME=0 INT1
Figure Output mode
Seiko Instruments Inc.
Rev.1.3_00
Power voltage detecting circuit
REAL-TIME CLOCK S-3531A
S-3531 internal power voltage detecting circuit. This circuit gives sampling movement only 15.6 once second. power voltage decreases below detection voltage (VDET), latch circuit latches level sampling movement stops. Only when subsequent communication status read command, output latch circuit transferred sift register sampling movement resumed. Decrease power voltage monitored reading POWER flag. That say, once decrease power voltage detected, detecting operation performed held unless perform initialization send status read command. Caution When power voltage increased first read operation performed after decrease power voltage occurs latch circuit latches "H", read POWER flag, however, next read operation performed after sampling detecting circuit, POWER flag reset since sampling subsequently allowed. timing diagram below.
VDET
Communication Sampling pulse Stop Stop Stop
Latch circuit output
POWER flag VDET
Communication Sampling pulse Stop Stop Stop Stop
Latch circuit output POWER flag [Timing sampling pulse]
Carry pulse Latch timing Sampling pulse 15.6
Carry-up timing
Figure Timing power voltage detecting circuit
Seiko Instruments Inc.
REAL-TIME CLOCK S-3531A
Example software treatment Initialization flow power-on START
Rev.1.3_00
Power
S-3531A back-up power turned only side, reset command does need transferring.
POWER=1 Reset command transfer
conditions good (e.g., noise) probable changes commands occurs serial communications, recommended make sure TEST flag.
test ending command used alternately
TEST=1 Reset command transfer
Status register setting command transfer Real-time data setting command transfer INT1 register setting command transfer
Figure Initialization flow
Seiko Instruments Inc.
Rev.1.3_00 Samples Application Circuits
S-3531AEFS INT1 F32K External XOUT
REAL-TIME CLOCK S-3531A
System power
with protective diode side, relation VCCVDD problem give great care standard. Make communications after system power turned stable state obtained. Figure Application circuit
Power switching circuit S-3531AEFS INT1 F32K External XOUT System power
Make communications after system power turned stable state obtained. Figure Application circuit Caution application circuits above guarantee proper operation. Evaluate actual application determine correct constants.
Seiko Instruments Inc.
REAL-TIME CLOCK S-3531A Adjustment Oscillating Frequency
Configuration oscillating circuit
Rev.1.3_00
Since crystal oscillation sensitive external noises (clock accuracy affected), following measures essential optimizing your oscillating circuit configuration: Place S-3531A, crystal oscillator external capacitor (Cg) close each other possible. Make high insulation resistance between pins substrate wiring patterns XOUT. place signal power lines close oscillating circuit.
XOUT Crystal oscillator:32,768 CL=6 Cg=3
Oscillating circuit internal constant standard values: Rf=20 Rd=220 Cd=12
S-3531A
Figure Connection diagram
Seiko Instruments Inc.
Rev.1.3_00
Measurement oscillating frequencies
REAL-TIME CLOCK S-3531A
When power turned S-3531A internal power-on detecting circuit operating outputs signal from INT1 select crystal oscillator optimize value. Turn power measure signal with frequency counter following circuit configuration shown Figure Remark error range ppm, relation time shifted approximately month calculated using following expression). ppm) seconds minutes hours days 2.592 seconds
XOUT
Open pull-up
INT1 F32K
Frequency counter
S-3531A
Figure Connection diagram Caution high-accuracy frequency counter order). Since signal continues output, must send reset command normal operation. Determine with frequency slow/fast range property referred.
Seiko Instruments Inc.
REAL-TIME CLOCK S-3531A
Adjustment oscillating frequencies
Rev.1.3_00
Matching crystal oscillator with nominal frequency must performed with parasitic capacitance board included. Select crystal oscillator optimize value accordance with flow chart below.
START
Select crystal oscillator.
Variable capacity <Trimer capacitor> <Fixed capacitor> center variable capacitor.
specification
Does frequency match Change
optimal value
Make fine adjustment frequency variable capacity.
Figure Crystal oscillator setting flow making matching adjustment with crystal, contact appropriate crystal maker determine value (load capacity) value (equivalent serial resistance). value value typ. recommended values. value selection must performed actual since parasitic capacitance affects Select value range from frequency does match, change value crystal. Adjust rotation angle variable capacity that capacity value somewhat smaller than center, confirm oscillating frequency center value variable capacity. This done order make capacity center value smaller than half actual capacity value because smaller capacity value makes greater quantity changes frequency. frequency does match, change value crystal. Caution Oscillating frequencies changed ambient temperature power voltage. Refer property samples. crystal oscillator operates slower higher lower ambient temperature than 25°C. Therefore, recommended adjust oscillator operate somewhat faster normal temperature.
Seiko Instruments Inc.
Rev.1.3_00 Precautions
REAL-TIME CLOCK S-3531A
apply electrostatic discharge this that exceeds performance ratings built-in electrostatic protection circuit. claims responsibility disputes arising connection with infringement products including this patents owned third party.
Seiko Instruments Inc.
REAL-TIME CLOCK S-3531A Characteristics (Reference Data)
Standby current IDD1 [µA] VDD=3 [pF] VDD=5 IDD1 [µA] Ta=25°C Standby current
Rev.1.3_00
Ta=25°C
Operating drain current Input clock Ta=25°C VDD=5 IDD2 [µA] VDD=3
Standby current temperature IDD1 [µA]
VDD=5
VDD=3
frequency Ta=25°C
[°C]
Oscillating frequency [ppm] VDD=5
Oscillating frequency Ta=25°C
[ppm]
VDD=3 [pF]
Seiko Instruments Inc.
Rev.1.3_00
Oscillating frequency temperature Ta=25°C, VDD=3
REAL-TIME CLOCK S-3531A
Oscillation start time VDD=5 Ta=25°C
[ppm]
-120 -160 [°C] TSTA [mS]
VDD=3
[pF]
Output current (VOUT IOL1) INT1 F32K pins, Ta=25°C VDD=5 [mA] VDD=3
(10) Output current (VOUT OL2) [mA] pin, Ta=25°C VDD=5
VDD=3
VOUT
VOUT
Seiko Instruments Inc.
3.1±0.3
0.15 -0.05
+0.1
0.22±0.1 0.65
FS008-A-P-SD-1.1
TITLE SCALE UNIT
SSOP8-A-PKG Dimensions FS008-A-P-SD-1.1
Seiko Instruments Inc.
1.55±0.05
4.0±0.1
2.0±0.05
0.3±0.05
8.0±0.1
1.55±0.05
1.4±0.1
(4.0)
6.9±0.1
Feed direction
FS008-A-C-SD-1.1
TITLE SCALE UNIT
SSOP8-A-Carrier Tape FS008-A-C-SD-1.1
Seiko Instruments Inc.
13.5±0.5
Enlarged drawing central part
2±0.5 13±0.2
2±0.5
21±0.8
FS008-A-R-SD-1.1
TITLE SCALE UNIT
SSOP8-A-Reel FS008-A-R-SD-1.1
QTY. 2,000
Seiko Instruments Inc.
information described herein subject change without notice. Seiko Instruments Inc. responsible problems caused circuits diagrams described herein whose related industrial properties, patents, other rights belong third parties. application circuit examples explain typical applications products, guarantee success specific mass-production design. When products described herein regulated products subject Wassenaar Arrangement other agreements, they exported without authorization from appropriate governmental authority. information described herein other purposes and/or reproduction copying without express permission Seiko Instruments Inc. strictly prohibited. products described herein cannot used part device equipment affecting human body, such exercise equipment, medical equipment, security systems, equipment, apparatus installed airplanes other vehicles, without prior written permission Seiko Instruments Inc. Although Seiko Instruments Inc. exerts greatest possible effort ensure high quality reliability, failure malfunction semiconductor products occur. user these products should therefore give thorough consideration safety design, including redundancy, fire-prevention measures, malfunction prevention, prevent accidents, fires, community damage that ensue.
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