S-35199A01
www.sii-ic.com
© Seiko Instruments Inc., 2007-2010
3-WIRE REAL-TIME CLOCK
Rev.2.0
_00
Features
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Applications
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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
SC
ON
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
3-wire (micro wire) 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
TI
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ED
Seiko Instruments Inc.
PR
OD
UC
T
The S-35199A01 is a CMOS 3-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.
1
3-WIRE REAL-TIME CLOCK
S-35199A01
Pin Configuration
Rev.2.0
_00
WLP-12A
Bottom View
D3
F32K
D2
FOUT
C3
VDD
C2
INT
A3
CS
A2
SIO
B3
SCK
B2
CTRL
B1
XIN
(1.84
×
1.97
×
0.6 max)
Figure 1
Marking Specifications
Top View
1 9 9 A
List of Pin
Pin No.
A1
B1
C1
D1
A2
Symbol
VSS
XIN
XOUT
VDDL
SIO
Description
tion
TI
NU
ED
Figure 2
Table 1
I/O
−
−
−
0 1 (1) (2)
Lot number
PR
Configuration
−
−
−
B2
C2
D2
A3
B3
C3
D3
DI
SC
GND pin
Connection pin for
crystal oscillator
Power supply pin for FOUT
output
CTRL
INT
FOUT
CS
SCK
VDD
F32K
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
CMOS input
Input pin for chip select
Input
(built-in pull-down resistor. no protective diode at
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)
ON
2
Seiko Instruments Inc.
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D1
C1
VDDL XOUT
A1
VSS
Rev.2.0
_00
Pin Function
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3-WIRE REAL-TIME CLOCK
S-35199A01
CS (input for chip select) pin
This pin is to input chip select, has a pull-down resistor. Communication is available when this pin is in “H” level. If not
using communication, set this pin “L” or open.
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SIO (I/O for serial data) pin
This pin is to data input/output for serial interface. When the CS pin is in “H”, the SIO pin inputs/outputs data by
synchronizing with a clock pulse from the
SCK
pin. The status is in high impedance when the CS pin is in “L” or open,
so that the S-35199A01 does not transmit data. Setting the CS pin to “H” level from “L” or open, this SIO pin goes in the
input status so that it receives the command data. This pin has CMOS input and Nch open drain output.
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SCK
(input for serial clock) pin
This pin is to input a clock pulse for serial interface. When the CS pin is in “H”, the SIO pin inputs/outputs data by
synchronizing with the clock pulse. When the CS pin is in “L” or open, the
SCK
pin does not accept inputting a clock
pulse.
Connect a crystal oscillator between XIN and XOUT.
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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 1
interrupt, alarm 2 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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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
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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.
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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
SC
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.
ON
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INT (output for interrupt signal) pin
Seiko Instruments Inc.
PR
•
XIN, XOUT (crystal oscillator connect) pin
OD
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T
3
3-WIRE REAL-TIME CLOCK
S-35199A01
Equivalent Circuits of I/O Pin
Rev.2.0
_00
SCK
SIO
Figure 3
SCK
pin
CS, CTRL
Figure 5
CS pin, CTRL pin
TI
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ED
PR
Figure 6
VDDL
FOUT
DI
SC
Figure 7 FOUT pin and VDDL pin
ON
4
Seiko Instruments Inc.
OD
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Figure 4
INT, F32K
SIO pin
INT
pin, F32K pin
Rev.2.0
_00
Block Diagram
3-WIRE REAL-TIME CLOCK
S-35199A01
XIN
XOUT
CTRL
Oscillator
32.768 kHz controller
F32K
Divider,
timing generator
INT controller 1
OD
UC
T
Alarm expansion
register 1
Comparator 1
Year
Comparator 2
Alarm expansion
register 2
Serial
interface
INT register 1
Clock correction
register
VDDL
FOUT
Status
register 1
Status
register 2
FOUT setting
register 1
PR
INT
FOUT setting
register 2
Free register
ON
TI
NU
ED
INT register 2
Second Minute Hour Day of Day Month
week
Real-time data register
INT controller 2
SIO
SCK
CS
DI
SC
24-bit
binary
up counter
Low power
ow
supply voltage
detector
Constant-
voltage circuit
Shift register
VDD
Power-on
detection
circuit
VSS
Figure 8
Seiko Instruments Inc.
5
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