S-35190A
www.sii-ic.com
© Seiko Instruments Inc., 2004-2015
3-WIRE REAL-TIME CLOCK
Rev.4.2
_00
The S-35190A is a CMOS 3-wire real-time clock IC which operates with the very low current consumption in the wide range of
operation voltage. The operation voltage is 1.3 V to 5.5 V so that the S-35190A 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, the S-35190A 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.
The S-35190A has the function to correct advance / delay of the clock data speed, in the wide range, which is caused by the
crystal 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.
Features
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*1.
Low current consumption:
0.25
μA
typ. (V
DD
= 3.0 V, Ta =
+25°C)
Wide range of operating voltage:
1.3 V to 5.5 V
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 (built-in C
d
, external C
g
)
*1
Lead-free, Sn 100%, halogen-free
Refer to "
Product Name Structure"
for details.
Applications
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Mobile game device
Mobile AV device
Digital still camera
Digital video camera
Electronic power meter
DVD recorder
TV, VCR
Mobile phone, PHS
Packages
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8-Pin SOP (JEDEC)
8-Pin TSSOP
SNT-8A
Seiko Instruments Inc.
1
3-WIRE REAL-TIME CLOCK
S-35190A
Block Diagram
Rev.4.2
_00
XIN
XOUT
Divider,
Oscillation
circuit
Timing generator
INT register 1
INT controller 1
Clock correction register
Status register 1
Status register 2
Comparator 1
Real-time data register
Day of
Second Minute Hour the week Day Month Year
INT
Comparator
2
Free register
Low power supply
voltage detector
Power-on
detection circuit
Constant-voltage
circuit
VSS
INT register 2
VDD
INT controller 2
SIO
SCK
CS
Shift register
Serial
interface
Figure 1
2
Seiko Instruments Inc.
Rev.4.2
_00
Product Name Structure
1. Product name
1. 1
8-Pin SOP (JEDEC), 8-Pin TSSOP
S-35190A -
xxxx
x
3-WIRE REAL-TIME CLOCK
S-35190A
Environmental code
U:
Lead-free (Sn 100%), halogen-free
G:
Lead-free (for details, please contact our sales office)
Package name (abbreviation) and IC packing specification
*1
J8T1: 8-Pin SOP (JEDEC), Tape
T8T1: 8-Pin TSSOP, Tape
Product name
*1.
1. 2
Refer to the tape drawing.
SNT-8A
S-35190A -
I8T1
U
Environmental code
U:
Lead-free (Sn 100%), halogen-free
Package name (abbreviation) and IC packing specification
*1
I8T1: SNT-8A, Tape
Product name
*1.
Refer to the tape drawing.
2. Packages
Table 1
Package Name
Environmental code = G
8-Pin SOP (JEDEC)
Environmental code = U
Environmental code = G
8-Pin TSSOP
Environmental code = U
SNT-8A
Package Drawing Codes
Tape
FJ008-D-C-SD
FJ008-D-C-SD
FT008-E-C-SD
FT008-E-C-SD
PH008-A-C-SD
Reel
FJ008-D-R-SD
FJ008-D-R-S1
FT008-E-R-SD
FT008-E-R-S1
PH008-A-R-SD
Land
−
−
−
−
PH008-A-L-SD
Dimension
FJ008-A-P-SD
FJ008-A-P-SD
FT008-A-P-SD
FT008-A-P-SD
PH008-A-P-SD
Seiko Instruments Inc.
3
3-WIRE REAL-TIME CLOCK
S-35190A
Pin Configurations
1. 8-Pin SOP (JEDEC)
Top view
1
2
3
4
8
7
6
5
Rev.4.2
_00
Table 2
Pin No
1
Symbol
Description
I/O
List of Pins
Configuration
INT
XOUT
XIN
VSS
CS
2
3
4
5
6
Output pin for
Output
interrupt signal
Connection
−
pins for crystal
oscillator
GND pin
−
Input pin for
chip select
Input pin for
serial clock
I/O pin for
serial data
Pin for positive
power supply
Nch open-drain output
(no protective diode at VDD)
−
−
Figure 2
S-35190A-J8T1x
SCK
SIO
VDD
2. 8-Pin TSSOP
7
Top view
1
2
3
4
8
7
6
5
CMOS input
(built-in pull-down resistor.
Input
no protective diode at VDD)
CMOS input
Input
(no protective diode at VDD)
Nch open-drain output
Bi-directional (no protective diode at VDD)
CMOS input
−
−
8
Figure 3
S-35190A-T8T1x
3. SNT-8A
Top view
1
2
3
4
8
7
6
5
Figure 4
S-35190A-I8T1U
Remark 1.
x: G or U
2.
Please select products of environmental code = U for Sn 100%, halogen-free products.
4
Seiko Instruments Inc.
Rev.4.2
_00
Pin Functions
1. CS (input for chip select) pin
3-WIRE REAL-TIME CLOCK
S-35190A
This pin is to input chip select, has a pull-down resistor. Communication is available when this pin is in "H". If not using
communication, set this pin "L" or open.
2.
SCK
(input for serial clock) pin
This pin is to input a clock pulse for serial interface. When the CS pin is in "H", the SIO pin inputs / outputs data by
synchronizing with the clock pulse. When the CS pin is in "L" or open, the
SCK
pin does not accept inputting a clock
pulse.
3. SIO (I/O for serial data) pin
This is a data input / output pin of serial interface. When the CS pin is in "H", the SIO pin inputs / outputs data by
synchronizing with a clock pulse from the
SCK
pin. The status is in "High-Z" 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.
4. XIN, XOUT (crystal oscillator connect) pins
Connect a crystal oscillator between XIN and XOUT.
5.
INT
(output for interrupt signal) pin
This pin outputs a signal of interrupt, or a clock pulse. By using the status register 2, users can select either of; alarm 1
interrupt, alarm 2 interrupt, output of user-set frequency, minute-periodical interrupt 1, minute-periodical interrupt 2, or
32.768 kHz output. This pin has Nch open drain output.
6. VDD (positive power supply) pin
Connect this VDD pin with a positive power supply. Regarding the values of voltage to be applied, refer to
"
Recommended Operation Conditions
".
7. VSS pin
Connect the VSS pin to GND.
Seiko Instruments Inc.
5
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