S-35192A
www.sii-ic.com
© Seiko Instruments Inc., 2006-2015
3-WIRE REAL-TIME CLOCK
Rev.3.1
_00
The S-35192A 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-35192A can be used for various power
supplies from main supply to backup battery. Due to the 0.45
μA
current consumption and wide range of power supply voltage
at time keeping, the S-35192A 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-35192A 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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Low current consumption:
0.45
μA
typ. (V
DD
= 3.0 V, Ta =
+25°C)
Constant output of 32.768 kHz clock pulse (Nch open-drain output)
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 function
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)
Lead-free (Sn 100%), halogen-free
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
Package
•
SNT-8A
Seiko Instruments Inc.
1
3-WIRE REAL-TIME CLOCK
S-35192A
Block Diagram
Rev.3.1
_00
XIN
XOUT
Oscillatoion
circuit
Divider,
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
Day Month Year
the week
Comparator 2
32KO
Free register
Low power supply
voltage detector
Power-on
detection circuit
Constant-voltage
circuit
VSS
INT register 2
INT
controller 2
Serial
interface
SIO
SCK
CS
VDD
Shift register
Figure 1
2
Seiko Instruments Inc.
Rev.3.1
_00
Product Name Structure
1. Product name
S-35192A -
I8T1
U
Environmental code
U:
Lead-free (Sn 100%), halogen-free
3-WIRE REAL-TIME CLOCK
S-35192A
Package name (abbreviation) and IC packing specification
*1
I8T1: SNT-8A, Tape
Product name
*1.
Refer to the tape drawing.
2. Package
Table 1
Package Name
SNT-8A
Dimension
PH008-A-P-SD
Package Drawing Codes
Tape
PH008-A-C-SD
Reel
PH008-A-R-SD
Land
PH008-A-L-SD
Seiko Instruments Inc.
3
3-WIRE REAL-TIME CLOCK
S-35192A
Pin Configuration
1. SNT-8A
Pin No. Symbol
Top view
1
2
3
4
8
7
6
5
Rev.3.1
_00
Table 2
Description
List of Pins
I/O
Configuration
Nch open-drain output
(no protective diode at VDD)
−
−
1
2
3
32KO
XOUT
XIN
VSS
CS
Figure 2
S-35192A-I8T1U
4
5
6
7
8
Pin for constant
output of
Output
32.768 kHz
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
SCK
SIO
VDD
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
−
−
4
Seiko Instruments Inc.
Rev.3.1
_00
Pin Functions
1. CS (input for chip select) pin
3-WIRE REAL-TIME CLOCK
S-35192A
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 pin 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-35192A does not transmit data. Setting the CS pin to "H" 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. 32KO (constant output of 32.768 kHz) pin
This is an output pin for 32.768 kHz. This pin constantly outputs a clock pulse after power-on.
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 this VSS pin to GND.
Equivalent Circuits of Pins
SCK
SIO
Figure 3
SCK
pin
Figure 4
SIO pin
CS
32KO
Figure 5
CS pin
Figure 6 32KO pin
Seiko Instruments Inc.
5
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