S-35190A-J8T1G Seiko Instruments, S-35190A-J8T1G Datasheet

IC REAL TIME CLOCK 3WIRE 8-SOP

S-35190A-J8T1G

Manufacturer Part Number
S-35190A-J8T1G
Description
IC REAL TIME CLOCK 3WIRE 8-SOP
Manufacturer
Seiko Instruments
Type
Clock/Calendarr
Datasheet

Specifications of S-35190A-J8T1G

Time Format
HH:MM:SS (12/24 hr)
Date Format
YY-MM-DD-dd
Interface
3-Wire Serial
Voltage - Supply
1.3 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Memory Size
-

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© Seiko Instruments Inc., 2004-2010
The S-35190A is a CMOS 3-wire real-time clock IC which operates with the very low current consumption and in the wide
range of operation voltage. The operation voltage is 1.3 V to 5.5 V so that this IC can be used for various power supplies from
main supply to backup battery. Due to the 0.25 μA current consumption and wide range of power supply voltage at time
keeping, this IC makes the battery life longer. In the system which operates with a backup battery, the included free registers
can be used as the function for user’s backup memory. Users always can take back the information in the registers which is
stored before power-off the main power supply, after the voltage is restored.
This IC has the function to correct advance/delay of the clock data speed, in the wide range, which is caused by the oscillation
circuit’s frequency deviation. Correcting according to the temperature change by combining this function and a temperature
sensor, it is possible to make a high precise clock function which is not affected by the ambient temperature.
www.sii-ic.com
Features
Applications
Packages
• Low current consumption :
• Wide range of operating voltage :
• Built-in clock-correction function
• Built-in free user register
• 3-wire (MICROWIRE) CPU interface
• Built-in alarm interrupter
• Built-in flag generator during detection of low power voltage or at power-on
• Auto calendar up to the year 2099, automatic leap year calculation function
• Built-in constant voltage circuit
• Built-in 32.768 kHz crystal oscillator (C
• Lead-free, Sn 100%, halogen-free
*1. Refer to “ Product Name Structure” for details.
• Mobile game devices
• Mobile AV devices
• Digital still cameras
• Digital video cameras
• Electronic power meters
• DVD recorders
• TVs, VCRs
• Mobile phones, PHS
• Car navigation
• 8-Pin SOP (JEDEC)
• 8-Pin TSSOP
• SNT-8A
*1
d
built in, C
Seiko Instruments Inc.
0.25 μA typ. (V
1.3 to 5.5 V
g
external)
DD
= 3.0 V, Ta = 25°C)
3-WIRE REAL-TIME CLOCK
S-35190A
Rev.3.0
_00
1

Related parts for S-35190A-J8T1G

S-35190A-J8T1G Summary of contents

Page 1

... The S-35190A is a CMOS 3-wire real-time clock IC which operates with the very low current consumption and in the wide range of operation voltage. The operation voltage that this IC can be used for various power supplies from main supply to backup battery. Due to the 0.25 μA current consumption and wide range of power supply voltage at time keeping, this IC makes the battery life longer. In the system which operates with a backup battery, the included free registers can be used as the function for user’ ...

Page 2

... REAL-TIME CLOCK S-35190A Pin Configuration Remark Please select products of environmental code = U for Sn 100%, halogen-free products. List of Pin Pin No. Symbol Description Output pin for 1 INT Interrupt signal 2 XOUT Connection pin for crystal oscillator 3 XIN 4 VSS GND pin Input pin for chip ...

Page 3

... SCK pin. The status is in high impedance when the CS pin is in “L” or open, so that the S-35190A does not transmit data. Setting the CS pin to “H” level from “L” or open, this SIO pin goes in the input status so that it receives the command data. This pin has CMOS input and Nch open drain output. • ...

Page 4

... VDD voltage detector Power-on detection circuit Constant-voltage circuit VSS 4 Divider, INT register 1 Comparator 1 Second Minute Hour Comparator 2 INT register 2 Shift register Figure 8 Seiko Instruments Inc. Rev.3.0 INT controller 1 Real-time data register Day of Day Month Year the week INT controller 2 Serial interface ...

Page 5

... Storage temperature T stg *1. Conditions with no condensation or frost. Condensation and frost cause short circuiting between pins, resulting in a malfunction. Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. ...

Page 6

... SIO, INT OUT SS − CS, SCK , SIO − CS, SCK , SIO V = 0.4 V INT OUT SIO V = 0.4 V OUT − − Seiko Instruments Inc 9.1 pF) manufactured by Seiko Instruments Inc.) g Min. Typ. Max. − 0.25 0.93 − 3.3 − 0.5 − 0.5 − 0.5 − 0 100 300 − ...

Page 7

... Output data definition time Setup time before CS fall Hold time after CS fall Input rise/fall time *1. Since the output format of the SIO pin is Nch open-drain output, output data definition time is determined by the values of the load resistance (R ) and load capacity (C L *2. Regarding the power supply voltage, refer to “ Recommended Operation Conditions”. ...

Page 8

... Figure 10 Timing Diagram 1 during 3-wire Communication Input data Figure 11 Timing Diagram 2 during 3-wire Communication Output data Figure 12 Timing Diagram 3 during 3-wire Communication 8 t ISU SCK 20% t 80% 20 SCK SCK 50% 20% t ACC 80% 20% Seiko Instruments Inc. t CSS 80% 80% 20% IHO 80% 20% t SCK 50% 50% 80% 20% Rev.3.0 _00 ...

Page 9

... Configuration of Data Communication 1. Configuration of data communication After setting the CS pin “H”, transmit the 4-bit fixed code “0110”, after that, transmit a 3-bit command and 1-bit Read/Write command. Next, data is output or input from B7. Regarding details, refer to “ Serial Interface”. Fixed code ...

Page 10

... Read-only flag. Valid only when using the alarm function. When the alarm time matches, this flag is set to “1”, and it is cleared to “0” when Read. *4. Read-only flag. “POC” is set to “1” when power is applied cleared to “0” when Read. Regarding “BLD”, refer to “ Low Power Supply Voltage Detection Circuit”. ...

Page 11

... BCD code. To Write/Read real-time data 1 access, transmit/receive the data of year in B7, month, day, day of the week, hour, minute, second in B0, in 7-byte. When you skip the procedure to access the data of year, month, day, day of the week, Read/Write real-time data 2 access. In this case, transmit/receive the data of hour in B7, minute, second in B0, in 3-byte ...

Page 12

... Feb. (leap year 28: Feb. (non-leap year) Example: 29 (D1, D2, D4, D8, D10, D20 ( Day of the week data (00 to 06): W1, W2 septenary up counter. Day of the week is counted in the order of 00, 01, 02, …, 06, and 00. Set up day of the week and the count value. Hour data ( 11): H1, H2, H4, H8, H10, H20 12-hour expression, write 0 ...

Page 13

... This flag is set to “1” when the power supply voltage decreases to the level of detection voltage (V can detect a drop in the power supply voltage. This flag is set to “1” once, is not set to “0” again even if the power supply increases to the level of detection voltage (V to initialize. Regarding the operation of the power supply voltage detection circuit, refer to “ ...

Page 14

... R TEST This is a test flag for SII. Be sure to set this flag to “0” in use. If this flag is set to “1”, be sure to initialize to set “0” INT2AE This is an enable bit for alarm 2 interrupt. When this bit is “0”, alarm 2 interrupt is disabled. When it is “1” enabled. ...

Page 15

... INT register 1 and INT register 2 The INT register set up the output of user-set frequency set up alarm 1 interrupt. The INT register 2 is for setting alarm 2 interrupt. Users are able to switch the output mode by using the status register 2. If selecting to use the output mode for alarm interrupt by status register 2; this register works as the alarm-time data register. In the INT register 1, if selecting the output of user-set frequency by status register 2 ...

Page 16

... S-35190A (2) Output of user-set frequency The INT register 1-byte data register to set up the output frequency. Setting each bit the register to “1”, the frequency which corresponds to the bit is output in the AND-form. SC4 to SC6 is 3-bit SRAM type registers that can be freely set by users. ...

Page 17

... Rev.3.0 _00 5. Clock-correction register The clock-correction register is a 1-byte register that is used to correct advance/delay of the clock. When not using this function, set this register to “00h”. Regarding the register values, refer to “ Function to Clock-Correction” R/W R/W 6. Free register The free register is a 1-byte SRAM type register that can be set freely by users. ...

Page 18

... Hz clock pulse is output from the INT pin. When “1” is set in the POC flag, be sure to initialize. The POC flag is set to “0” due to initialization so that the output of user-set frequency mode is cleared. (Refer to “ Register Status After Initialization ”.) For the regular operation of power-on detection circuit, as seen in Figure 22 , the period to power-up the S-35190A is that the voltage reaches 1.3 V within 10 ms after setting the IC’ ...

Page 19

... Fixed code + command Write “1” to reset flag and 00 (Y), 01 (M), 01 (D), 0 (day of the week), 00 (H), 00 (M), 00 (S) “ b” (In B6, B5, B4, the data of B6, B5 the status register 1 at initialization is set. Refer to Figure 23 .) “00h” “00h” “00h” “00h” ...

Page 20

... BLD flag is read, the BLD flag is automatically set to “0” to restart the sampling operation. If the BLD flag is “1” even after the power supply voltage is recovered, the internal circuit may be in the indefinite status. In this case, be sure to initialize the circuit. ...

Page 21

... Rev.3.0 _00 Correction of Nonexistent Data and End-of-Month When users write the real-time data, the S-35190A checks it. In case that the data is invalid, the S-35190A does the following procedures. 1. Processing of nonexistent data Register Year data Month data Day data Day of the week data ...

Page 22

... INT1AE/INT2AE in the status register 2. To set the alarm time, set the data of day of the week, hour, minute in the INT register set the data of year, month, day in the INT register Refer to “4. INT register 1 and INT register 2” in “ Configuration of Register” . ...

Page 23

... INT pin when the minute is counted up. 2. Output of user-set frequency The output of user-set frequency is the function to output the frequency which is selected by using data, from the INT pin, in the AND-form. Set up the data of frequency in the INT register 1. ...

Page 24

... Per-minute edge interrupt output is the function to output “L” from the INT pin, when the first minute-carry processing is done, after selecting the output mode. To set the pin output to “H”, set “0” in INT1ME in the status register 2 to turn off the output mode of per-minute edge interrupt ...

Page 25

... However, in Read in the real-time data register, the procedure delays at max. 0.5 sec thus output “L” from the INT pin also delays at max. 0.5 sec. In Write in the real-time data register, some delay is made in the output period due to Write timing and the second-data during Write. ...

Page 26

... The minimum resolution is approx. 3 ppm (or approx. 1 ppm) and the S-35190A corrects in the range of − 195.3 to +192.2 ppm (or of − 65.1 to +64.1 ppm). (Refer to Table 12 .) Users can set up this function by using the clock-correction register. Regarding how to calculate the setting data, refer to “1. How to calculate” . When not using this function, be sure to set “ ...

Page 27

... Correction value Caution The figure range which can be corrected is that the calculated value is from 0 to 64. *1. Convert this value to be set in the clock correction register. For how to convert, refer to “ (a) Calculation example 1”. *2. Measurement value when 1 Hz clock pulse is output from the INT pin. ...

Page 28

... REAL-TIME CLOCK S-35190A 2. Setting value for register and correction value Table 13 Setting Value for Register and Correction Value (Minimum Resolution: 3.052 ppm ( Table 14 Setting Value for Register and Correction Value (Minimum Resolution: 1.017 ppm ( • • • • ...

Page 29

... The S-35190A does not adjust the frequency of the crystal oscillation by using the clock-correction function. Therefore users cannot confirm corrected or not by measuring output 32.768 kHz. When the function to clock-correction is being used, the cycle clock pulse output from the INT pin changes once in 20 times or 60 times, as shown in Figure 33 . ...

Page 30

... SCK clock, the state of data writing is entered. In this state, the data, which is input in synchronization with the falling of the subsequent SCK clock input, is written to registers according to each command. In data Write, input a clock pulse which is equivalent to the byte of the register. As well as in Read, when the SCK clock is less than 8, the the clock-wait status, and no processing is performed. ...

Page 31

... SIO Fixed code + command (3) Status register 1 access and status register 2 access CS SCK SIO During reading: Output mode switching * Status register 1 selected 1 : Status register 2 selected Figure 36 Status Register 1 Access and Status Register 2 Access Minute data Hour data During reading: Output mode switching ...

Page 32

... Read/Write the INT register 2 after setting INT2AE in the status register 2. When INT2AE is in “1”, the INT register 2 works as for setting the 3-byte alarm time data. The INT register 2 does not have the function to output the user-set frequency. Regarding details of each data, refer to “ ...

Page 33

... During reading: Output mode switching (6) Free register access CS SCK SIO During reading: Output mode switching Fixed code + Clock correction command data Figure 39 Clock Correction Register Access Fixed code + Free register data command Figure 40 Free Register Access Seiko Instruments Inc. 3-WIRE REAL-TIME CLOCK 16 B0 During reading: ...

Page 34

... Figure 41 shows the flowchart of initialization at power-on and an example of real-time data set-up. Regarding how to apply power, refer to “ Power-on Detection Circuit and Register Status” unnecessary for users to comply with this flowchart of real-time data strictly. And if using the default data at initializing also unnecessary to set up again. Read status register 1 (status register ...

Page 35

... VSS SCK XOUT XIN C g Caution 1. Because the I/O pin has no protective diode on the VDD side, the relation of V But pay careful attention to the specifications. 2. Start communication under stable condition after power-on the power supply in the system. VDD S-35190A VSS XIN ...

Page 36

... REAL-TIME CLOCK S-35190A Adjustment of Oscillation Frequency 1. Configuration of oscillation Since crystal oscillation is sensitive to external noise (the clock accuracy is affected), the following measures are essential for optimizing the oscillation configuration. (1) Place the S-35190A, crystal oscillator, and external capacitor (C (2) Increase the insulation resistance between pins and the substrate wiring patterns of XIN and XOUT. ...

Page 37

... signal is not output, the power-on detection circuit does not operate normally. Turn off the power and then turn it on again. For how to apply power, refer to “ Power-on Detection circuit and Register Status” . Remark If the error range is ± 1 ppm in relation to 1 Hz, the time is shifted by approximately 2.6 seconds per month (calculated using the following expression). ...

Page 38

... Adjust the rotation angle of the variable capacitance so that the capacitance value is slightly smaller than the center, and confirm the oscillation frequency and the center value of the variable capacitance. This is done in order to make the capacitance of the center value smaller than one half of the actual capacitance value because a smaller capacitance value increases the frequency variation. ...

Page 39

... Seiko Instruments Inc. assumes no responsibility for the way in which this IC is used in products created using this IC or for the specifications of that product, nor does Seiko Instruments Inc. assume any responsibility for any infringement of patents or copyrights by products that include this IC either in Japan or in other countries. ...

Page 40

... SCK frequency [kHz] (5) Standby current vs. C characteristics ° 1.0 0.9 0.8 0.7 0.6 I DD1 0.5 [μA] 0.4 0 (2) Current consumption when 32.768 kHz is output vs DD3 [μ [V] DD (4) Standby current vs. Temperature characteristics = 5 DD1 [μ 3 600 800 1000 (6) Oscillation frequency vs Δ ...

Page 41

... Seiko Instruments Inc. 3-WIRE REAL-TIME CLOCK − 3.0 V −40 DD −60 −80 −100 −120 −140 −40 − [°C] OUT INT pin ° 5 3 [V] OUT CS pin ° C 800 700 600 500 400 300 200 100 [V] IN S-35190A OL1 ...

Page 42

... REAL-TIME CLOCK S-35190A (13) BLD detection, release voltage, V Temperature characteristics 1.4 1.2 1.0 0.8 BLD [V] 0.6 0.4 0.2 0 −40 − [°C] 42 (Min) vs. DDT Release voltage Detection voltage V (Min) DDT Seiko Instruments Inc. Rev.3.0 _00 ...

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... Seiko Instruments Inc. is strictly prohibited. • The products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Seiko Instruments Inc. ...

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