S-35399A02
www.sii-ic.com
© Seiko Instruments Inc., 2007-2010
2-WIRE REAL-TIME CLOCK
Rev.2.0
_00
Features
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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
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WLP-12A
DI
S
CO
Applications
NT
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Low current consumption :
0.34
μA
typ. (V
DD
= 3.0 V, Ta = 25°C)
25
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 (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 oscillator (C
d
built in, C
g
external)
Lead-free, halogen-free
Seiko Instruments Inc.
PR
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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
A
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
oscillatio
circuit’s frequency deviation. Correcting according to the temperature change by combining this function and a temperature
mperature
th
sensor, it is possible to make a high precise clock function which is not affected by the ambient temperature. This IC has the
h
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.
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2-WIRE REAL-TIME CLOCK
S-35399A02
Pin Configuration
Rev.2.0
_00
WLP-12A
Bottom View
D3
F32K
C3
VDD
B3
SCL
A3
INT2
A2
SDA
D2
C2
B2
FOUT INT1 CTRL
D1
C1
VDDL XOUT
B1
XIN
(1.84
×
1.97
×
0.6 max)
Figure 1
Marking Specifications
Top View
3 9 9 A
List of Pin
Pin No.
A1
B1
C1
D1
A2
Symbol
VSS
XIN
XOUT
VDDL
SDA
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Figure 2
Table 1
I/O
−
−
−
Description
tion
0 2 (1) (2)
Lot number
PR
Configuration
−
−
−
GND pin
Connection pin for
crystal oscillator
B2
C2
D2
A3
B3
C3
D3
DI
S
CTRL
INT 1
FOUT
INT2
SCL
VDD
F32K
CO
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)
Nch open-drain output
Output pin for interrupt signal
Output
(no protective diode at VDD)
Output pin for clock pulse
Output
CMOS output
signal
Nch open-drain output
Output pin for interrupt signal
Output
(built-in pull-down resistor. no protective diode at
2
VDD)
CMOS input
Input pin for serial clock
Input
(no protective diode at VDD)
Pin for positive power supply
−
−
Nch open-drain output
Pin for 32.768 kHz output
Output
(no protective diode at VDD)
2
Seiko Instruments Inc.
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A1
VSS
Rev.2.0
_00
Pin Functions
•
2-WIRE REAL-TIME CLOCK
S-35399A02
SDA (I/O for serial data) pin
This pin is to data input/output for 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.
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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.
•
XIN, XOUT (crystal oscillator connect) pin
Connect a crystal oscillator between XIN and XOUT.
•
INT1
(output for interrupt signal 1) pin
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INT2
(output for interrupt signal 2) pin
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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.
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F32K (32.768 kHz output) 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.
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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”
.
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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 V
DDL
≤
V
DD
.
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VSS pin
Connect this VSS pin to GND.
DI
S
•
FOUT (output for clock pulse signal) pin
CO
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.
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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.
Seiko Instruments Inc.
PR
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.
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2-WIRE REAL-TIME CLOCK
S-35399A02
Equivalent Circuits of I/O Pin
SDA
Rev.2.0
_00
SCL
Figure 3
SDA Pin
INT1, INT2, F32K
CTRL
PR
VDDL
FOUT
Figure 5
INT1 Pin,
INT2
Pin, F32K Pin
Figure 7
FOUT Pin and VDDL Pin
DI
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4
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Seiko Instruments Inc.
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Figure 4
SCL Pin
Figure 6 CTRL Pin
Rev.2.0
_00
Block Diagram
2-WIRE REAL-TIME CLOCK
S-35399A02
XIN
XOUT
CTRL
Oscillator
32.768 kHz controller
F32K
Divider,
timing generator
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Alarm expansion
register 1
Comparator 1
Month Year
Comparator 2
Alarm expansion
register 2
Serial
interface
INT1 controller
VDDL
INT1 register
Clock correction
register
FOUT
INT1
Status
register 1
Status
register 2
FOUT setting
register 1
Second Minute Hour
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PR
Day of Day
the week
Real-time data register
registe
INT2
FOUT setting
register 2
INT2 register
Free register
DI
S
24-bit
binary
up counter
CO
INT2 controller
SDA
SCL
Shift register
VDD
Low power
ow
supply voltage
detector
Constant-
voltage circuit
Power-on
detection
circuit
VSS
Figure 8
Seiko Instruments Inc.
5
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