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S-35399A02
www.sii-ic.com
© Seiko Instruments Inc., 2007-2010
2-WIRE REAL-TIME CLOCK
Rev.2.0_00
The S-35399A02 is a CMOS 2-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 0.34 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. This IC has the
function for the external microcomputer’s sub clock to output the 32.768 kHz clock pulse. And for this output, users can select
either of Nch open drain or CMOS.
Moreover, this IC has a 24-bit binary up counter. This counter counts up every 60 sec from power-on so that users are able to
grasp the elapsed time from power-on up to 30 years.
„ Features
Low current consumption :
0.34 μA typ. (VDD = 3.0 V, Ta = 25°C)
Wide range of operating voltage :
1.3 to 5.5 V
Built-in clock-correction function
Clock pulse output (CMOS output, function to select frequency)
32.768 kHz clock pulse output (Nch open-drain, output control pin)
Built-in 24-bit binary up counter
Built-in free user register
2-wire (I2C-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 oscillator (Cd built in, Cg external)
Lead-free, halogen-free
„ Applications
Mobile game devices
Mobile AV devices
Digital still cameras
Digital video cameras
Electronic power meters
DVD recorders
TVs, VCRs
Mobile phones, PHS
Car navigation
„ Package
WLP-12A
Seiko Instruments Inc.
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2-WIRE REAL-TIME CLOCK
S-35399A02
„ Pin Configuration
„ Marking Specifications
WLP-12A
Bottom View
D3 C3 B3
F32K VDD SCL
D2 C2 B2
FOUT INT1 CTRL
D1 C1 B1
VDDL XOUT XIN
A3
INT2
A2
SDA
A1
VSS
(1.84 × 1.97 × 0.6 max)
Figure 1
Top View
Rev.2.0_00
399A
0 2 (1) (2)
Lot number
Figure 2
„ List of Pin
Table 1
Pin No.
A1
B1
C1
D1
A2
B2
C2
D2
A3
B3
C3
D3
Symbol
VSS
XIN
XOUT
VDDL
SDA
CTRL
INT1
FOUT
INT2
SCL
VDD
F32K
Description
I/O
Configuration
GND pin
Connection pin for
crystal oscillator
Power supply pin for FOUT
output
Nch open-drain output
I/O pin for serial data
Bi-directional (no protective diode at VDD)
CMOS input
CMOS input
Control pin for F32K output
Input
(built-in pull-down resistor. no protective diode at
VDD)
Output pin for interrupt signal
Output
Nch open-drain output
(no protective diode at VDD)
Output pin for clock pulse
signal
Output CMOS output
Output pin for interrupt signal
2
Output
Nch open-drain output
(built-in pull-down resistor. no protective diode at
VDD)
Input pin for serial clock
Input
CMOS input
(no protective diode at VDD)
Pin for positive power supply
Pin for 32.768 kHz output
Output
Nch open-drain output
(no protective diode at VDD)
2 Seiko Instruments Inc.

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Rev.2.0_00
2-WIRE REAL-TIME CLOCK
S-35399A02
„ Pin Functions
SDA (I/O for serial data) pin
This pin is to data input/output for I2C-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.
SCL (input for serial clock) pin
This pin is to input a clock pulse for I2C-bus interface. The SDA pin inputs/outputs data by synchronizing with the clock
pulse.
XIN, XOUT (crystal oscillator connect) pin
Connect a crystal oscillator between XIN and XOUT.
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.
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.
CTRL (F32K output control) pin
This pin is to control output from the F32K pin, has a pull-down resistor. This pin outputs a clock pulse from the F32K pin
when the CTRL pin is in “H”. It does not do so when the CTRL pin is in “L” or open.
Set this CTRL pin to “L” or open at power-on. To output 32.768 kHz from the F32K pin, after power-on, set the CTRL pin
to “H” more than one sec after.
F32K (32.768 kHz output) pin
This pin has the function to output-control, outputs 32.768 kHz. When the CTRL pin is in “H”, this pin outputs the 32.768
kHz clock pulse, when the CTRL pin is in “L” or open, the status is in high impedance. This pin has Nch open drain
output.
FOUT (output for clock pulse signal) pin
This pin is to output the clock pulse selected by users. Users can select the frequency by using the FOUT setting
register 1 and 2. This pin outputs “L” at power-on. This pin has CMOS output.
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”.
VDDL (positive power supply for FOUT output) pin
This pin is for positive power supply for the FOUT pin’s output. Set the value of voltage to be applied as VDDL VDD.
VSS pin
Connect this VSS pin to GND.
Seiko Instruments Inc.
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