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Rev. 1.3_00
REAL-TIME CLOCK
S-3530A
S-3530A is a CMOS real-time clock IC supporting an I2C-
BUS, which is designed to transfer or set each data of a clock
and calender as requested by a CPU. It provides connection
with a CPU via two wires and has two systems of an
interrupt/alarm features, allowing the alleviation of software
treatment on the side of a host.
It also works on lower power with the oscillating circuit
operated at a constant voltage.
Features
Low power consumption:
0.7 µA typ. (VDD=3.0 V)
Wide area of operating voltage: 1.7 to 5.5 V
BCD input/output of year, month, day, day of a week, hour, minute and second
CPU interface via two wires (I2C-BUS)
Auto calender till the year of 2,099
(automatic leap year arithmetic feature included)
Built-in power voltage detecting circuit
Built-in constant voltage circuit
Built-in flag generating circuit on power on/off
Built-in alarm interrupter (two systems)
Steady-state interrupt frequency/duty setting feature
Built-in 32 kHz crystal oscillating circuit (Internal Cd, External Cg)
Applications
Cellular phone
PHS
A variety of pagers
TV set and VCR
Games
Package
8-pin SSOP (pin pitch : 0.65 mm) (Package drawing code : FS008-A)
Die
Seiko Instruments Inc.
1

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REAL-TIME CLOCK
S-3530A
Block Diagram
XIN
XOUT
Oscillating
circuit
Timing
generation
VDD
VSS
Status register
Power
voltage
detecting
circuit
Constant
voltage
circuit
Rev.1.3_00
INT1 Register
Clock
generating
circuit
Comparator 1
Second Minute
Hour
Day of
week
Day
Month
Year
Comparator 2
INT2 Register
Shift register
Clock
generating
circuit
I2C-BUS
Interface
INT1
INT2
SDA
SCL
Figure 1
2 Seiko Instruments Inc.

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Rev.1.3_00
Product Code Structure
S-3530AE
xx
TB
REAL-TIME CLOCK
S-3530A
IC direction in tape specifications
Package name (abbreviation)
FS : 8-Pin SSOP
CA : Die
Description (fixed)
Seiko Instruments Inc.
3