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Rev. 1.2_00
REAL-TIME CLOCK
S-3510 Series
The S-3510 is a series of CMOS real-time clock ICs that inputs/
outputs serial clock or calendar data into/from the CPU.
Features
Operating power supply: 1.7 V to 5.5 V
Low current consumption: 1.2 µA typ. at 3.0 V
(S-3510AFFJA:
2.0 µA typ. at 3.0 V)
BCD output of second, minute, hour, day, date, month and year
Easy serial interface to CPU with 3 lines (SIO, SCK, and CS)
Built-in automatic calendar, automatic leap-year calculation up to 2099.
Built-in voltage detector
Built-in constant voltage circuit
Built-in 32 kHz oscillation circuit (Built-in Cg/Cd, or Cd only)
I Applications
Video cameras
FAXes
Cellular phones
Printers
I Package
8-Pin SOP (Pin pitch : 1.27 mm) (Package drawing code: FJ008-D)
Seiko Instruments Inc.
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REAL-TIME CLOCK
S-3510 Series
I Block Diagram
XIN
XOUT
TPOUT
OSC
&
Divider
VDD
VSS
Voltage
Detector
Rev. 1.2_00
Counter
Sec. Min.
Hr. Day
Date Mon. Year
Sec. Min. Hr. Day
Date Mon. Year
Shift Register
Status Register
Serial Interface
&
Controller
Figure 1
SIO
SCK
CS
2 Seiko Instruments Inc.

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Rev. 1.2_00
I Pin Assignment
TPOUT
XOUT
XIN
VSS
8-Pin SOP
Top view
1 8 VDD
2 7 SIO
3 6 SCK
4 5 CS
Figure 2
REAL-TIME CLOCK
S-3510 Series
I Pin Function
No. Name
1 TPOUT
2 XOUT
3 XIN
4 VSS
5 CS
6 SCK
7 SIO
8 VDD
Table 1
Function
Standard signal output (Nch open-drain output or CMOS output)
Connects to the X’ftal resonator (f=32,768 Hz)
Built-in Cg/Cd, or Cd only
Power supply (GND)
Chip select input (Built-in pull-down resistance) :
“H”: The SIO pin is capable of inputting/outputting data.
The SCK pin is capable of accepting the input.
“L”: The SIO pin is at Hi-Z.
The SCK pin is not capable of accepting the input.
Clock input :
Inputs and outputs data from the SIO pin in synchronization with the
clock. The clock cannot be accepted when the CS pin is “L”.
Serial data input/output :
When the CS is “L”, the SIO pin is at “Hi-Z”. When the CS pin changes
from “L” to “H”, it serves as the input pin. The SIO pin is assigned to the
input or output pin according to the next command data. The type of
output is either Nch open-drain or CMOS depending upon the model of
the IC you use.
Positive power supply
Seiko Instruments Inc.
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REAL-TIME CLOCK
S-3510 Series
I Command Configuration
Command
READ 1(Data Read)
READ 2(Data Read)
WRITE 1(Data Write)
WRITE 2(Data Write)
STATUS WRITE
RESET
TEST START
TEST END
Table 2
Code
1 1 1 0××××
1 1 1 1××××
1 0 0 1××××
1 0 0 0××××
1 0 1 1 D3 D2 D1 D0
10101 010
11010 101
11011 010
Rev. 1.2_00
Note
Output from the year data
Output from the day data
Input from the year data
Input from the day data
Status write
Initialization
Test mode start
Test mode end
I Data Configuration
The S-3510 series is provided with a timer data BCD (Binary Coded Decimal) display*1 device and an
automatic calendar. A set of flags are configured as follows:
Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 Year data (0 to 99)
0 0 0 M4 M3 M2 M1 M0 Month data (1 to 12)
0 0 D5 D4 D3 D2 D1 D0
Date data (1 to 31)
12/24 TPEN TPF FRE TEST W2 W1 W0
Status and day data (1 to 7)
AM/PM 0 H5 H4 H3 H2 H1 H0
Hour data (0 to 23 or 0 to 11) and flags
POW m6 m5 m4 m3 m2 m1 m0
Minute data (0 to 59) and flags
BLD S6 S5 S4 S3 S2 S1 S0
Second data (0 to 59) and flags
*1. AM/PM Flag : When writing in 12-hour display mode, always input 0 for AM and 1 for PM.
In 24-hour display mode, it is unnecessary as both 1 and 0 are ignorged.
However, when reading the time in either display mode 0 is read as AM 1 as PM.
BLD Flag :
When a decrease in the voltage is detected, it is set to 1. This is valid during
reading and is invalid during writing.
POW Flag :
1 is set at the power on, and cleared through the RESET command.
This flag is ingored during writing.
TEST Flag
When the test mode is set, it is set to 1. When the bit is 1, always use the TEST
END or RESET command to set to 0. This bit is valid for reading and ignored
during writing.
4 Seiko Instruments Inc.

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Rev. 1.2_00
REAL-TIME CLOCK
S-3510 Series
I Ordering Information
Model No.
S-3510ANFJA
S-3510ACFJA
S-3510ADFJ
S-3510AEFJ
S-3510AFFJ
SIO output
Nch open-drain
CMOS
CMOS
Nch open-drain
CMOS
Table 3
TPOUT output
Selection of 1 HZ /
32,768 HZ by command
Selection of 1 HZ /
32,768 HZ by command
32,768 HZ
32,768 HZ
32,768 HZ
TPOUT
output form
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
CMOS
Oscillation
circuit capacity
Internal Cg, Cd
Internal Cg, Cd
External Cg,
Internal Cd
Internal Cg, Cd
External Cg,
Internal Cd
Seiko Instruments Inc.
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