S-35399A03
www.ablic.com
© ABLIC Inc., 2007-2018
2-WIRE REAL-TIME CLOCK
Rev.3.2
_00
The S-35399A03 is a CMOS 2-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-35399A03 can be used for various power supplies
from main supply to backup battery. Due to the 0.34
μA
current consumption and wide range of power supply voltage at time
keeping, The S-35399A03 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-35399A03 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.
Moreover, the S-35399A03 has a 24-bit binary up counter. This counter counts up every 60 seconds from power-on so that
users are able to grasp the elapsed time from power-on up to 30 years.
Features
•
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Low current consumption:
0.34
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 24-bit binary up counter
Built-in free user register
2-wire (I
2
C-bus) 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 oscillation circuit (built-in C
d
, external C
g
)
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
Package
•
8-Pin SOP (JEDEC)
1
2-WIRE REAL-TIME CLOCK
S-35399A03
Block Diagram
Rev.3.2
_00
XIN
XOUT
Oscillation
circuit
Divider,
timing generator
INT1 controller
INT1 register
Clock correction
register
Status
register 1
Status
register 2
Second Minute Hour
Alarm expansion
register 1
INT1
Comparator 1
Day of Day
the week
Real-time data register
Month Year
Free register 1
Comparator 2
INT2
Free register 2
INT2 register
Free register 3
Alarm
expansion
INT2 controller
24-bit
binary
up counter
Low power
supply voltage
detector
Constant-
voltage circuit
Shift register
Serial
interface
SDA
SCL
VDD
Power-on
detection circuit
VSS
Figure 1
2
Rev.3.2
_00
Product Name Structure
1. Product name
S-35399A03
-
J8T1
U
2-WIRE REAL-TIME CLOCK
S-35399A03
Environmental code
U:
Lead-free (Sn 100%), halogen-free
Package name (abbreviation) and IC packing specification
*1
J8T1: 8-Pin SOP (JEDEC), Tape
Product name
*1.
Refer to the tape drawing.
2. Package
Table 1
Package Name
8-Pin SOP (JEDEC)
Package Drawing Codes
Tape
FJ008-D-C-SD
Reel
FJ008-D-R-S1
Dimension
FJ008-A-P-SD
3
2-WIRE REAL-TIME CLOCK
S-35399A03
Pin Configuration
1. 8-Pin SOP (JEDEC)
Top view
1
2
3
4
8
7
6
5
Rev.3.2
_00
Table 2
Pin No
1
2
3
4
Symbol
Description
Output pin for interrupt
signal 1
Connection pins
for quartz crystal
GND pin
Output pin for interrupt
signal 2
List of Pins
I/O
Configuration
Nch open-drain output
(no protective diode at VDD)
−
INT 1
XOUT
XIN
VSS
INT2
Output
−
−
5
6
7
8
Figure 2
S-35399A03-J8T1U
SCL
SDA
VDD
−
Nch open-drain output
Output
(no protective diode at VDD)
CMOS input
Input pin for serial clock Input
(no protective diode at VDD)
Nch open-drain output
I/O pin for serial data
Bi-directional (no protective diode at VDD)
CMOS input
Pin for positive power
−
−
supply
4
Rev.3.2
_00
Pin Functions
1. SDA (I/O for serial data) pin
2-WIRE REAL-TIME CLOCK
S-35399A03
This pin is a data input / output pin of I
2
C-bus interface. This pin inputs / outputs data by synchronizing with a clock pulse
from the SCL pin. This pin has CMOS input and Nch open-drain output. Generally in use, pull up this pin to the VDD
potential via a resistor, and connect it to any other device having open drain or open collector output with wired-OR
connection.
2. SCL (input for serial clock) pin
This pin is to input a clock pulse for I
2
C-bus interface. The SDA pin inputs / outputs data by synchronizing with the clock
pulse.
3. XIN, XOUT (quartz crystal connect) pins
Connect a quartz crystal between XIN and XOUT.
4.
INT1
(output for interrupt signal 1) 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, 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.
5.
INT2
(output for interrupt signal 2) pin
This pin outputs a signal of interrupt, or a clock pulse. By using the status register 2, users can select either of; alarm 2
interrupt, output of user-set frequency, per-minute edge interrupt or minute-periodical interrupt 1. 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 this VSS pin to GND.
Equivalent Circuits of Pins
SDA
SCL
Figure 3
SDA Pin
INT1, INT2
Figure 4
SCL Pin
Figure 5
INT1
Pin,
INT2
Pin
5
NXP MCU
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