S-35190A
www.sii-ic.com
© Seiko Instruments Inc., 2004-2011
3-WIRE REAL-TIME CLOCK
Rev.4.0
_00
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 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
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 (C
d
built in, C
g
external)
*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
Car navigation system
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.4.0
_00
XIN
XOUT
Divider,
Oscillator
Timing generator
INT controller 1
INT register 1
INT
Clock correction register
Status register 1
Status register 2
Comparator
2
Free register
INT register 2
Comparator 1
Real-time data register
Day of
Second Minute Hour the week Day Month Year
VDD
Low power supply
voltage detector
Power-on
detection circuit
Constant-voltage
circuit
INT controller 2
Shift register
Serial
interface
SIO
SCK
CS
VSS
Figure 1
2
Seiko Instruments Inc.
Rev.4.0
_00
Product Name Structure
1. Product name
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
J8T1 : 8-Pin SOP (JEDEC), Tape
T8T1 : 8-Pin TSSOP, Tape
I8T1 : SNT-8A, Tape
Product name
*1.
Refer to the tape drawing.
*1
2. Packages
Table 1
Package Name
8-Pin SOP (JEDEC)
8-Pin TSSOP
SNT-8A
Environmental code = G
Environmental code = U
Environmental code = G
Environmental code = U
Package Drawing Codes
Dimension
FJ008-A-P-SD
FJ008-A-P-SD
FT008-A-P-SD
FT008-A-P-SD
PH008-A-P-SD
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
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.4.0
_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
interrupt signal
Connection
pin 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
Output
－
－
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
Input
(built-in pull-down resistor.
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-I8T1x
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.4.0
_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) pin
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, per-minute edge interrupt, 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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