Rev.2.4
_00
3-WIRE REAL-TIME CLOCK
S-35190A
The S-35190A 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 0.25
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.
Features
•
•
•
•
•
•
•
•
•
•
•
•
Low current consumption :
0.25
µA
typ. (V
DD
=
3.0 V, Ta
=
25°C)
Wide range of operating voltage :
1.3 to 5.5 V
Built-in clock-correction function
Built-in free user register
3-wire (MICROWIRE) 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)
Package : 8-Pin SOP (JEDEC), 8-Pin TSSOP, SNT-8A
Lead-free product
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
Package Name
8-Pin SOP (JEDEC)
8-Pin TSSOP
SNT-8A
Drawing Code
Package
FJ008-A
FT008-A
PH008-A
Tape
FJ008-D
FT008-E
PH008-A
Reel
FJ008-D
FT-008E
PH008-A
Land
−
−
PH008-A
Seiko Instruments Inc.
1
3-WIRE REAL-TIME CLOCK
S-35190A
Pin Configuration
8-Pin SOP (JEDEC)
Top view
INT
XOUT
XIN
VSS
Rev.2.4
_00
1
2
3
4
8
7
6
5
VDD
SIO
SCK
CS
(1.84
×
1.97
×
0.6 max)
Figure 1
Pin Configuration (S-35190A-J8T1G)
8-Pin TSSOP
Top view
INT
XOUT
XIN
VSS
1
2
3
4
8
7
6
5
VDD
SIO
SCK
CS
Figure 2
Pin Configuration (S-35190A-T8T1G)
SNT-8A
Top view
INT
XOUT
XIN
VSS
Figure 3
1
2
3
4
8
7
6
5
VDD
SIO
SCK
CS
Pin Configuration (S-35190A-I8T1G)
List of Pin
Table 1
Pin No.
1
Symbol
Description
I/O
Configuration
INT
XOUT
XIN
VSS
CS
2
3
4
5
6
7
8
SCK
SIO
VDD
Output pin for
Interrupt signal
Connection pin for
crystal oscillator
GND pin
Input pin for chip
select
Input pin for serial
clock
I/O pin for serial
data
Pin for positive
power supply
Output
−
−
Nch open-drain output
(no protective diode at VDD)
−
−
CMOS input
(built-in pull-down resistor. no protective diode at VDD)
CMOS input
Input
(no protective diode at VDD)
Nch open-drain output
Bi-directional (no protective diode at VDD)
CMOS input
Input
−
−
2
Seiko Instruments Inc.
Rev.2.4
_00
Pin Function
•
3-WIRE REAL-TIME CLOCK
S-35190A
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.
•
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.
•
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-35190A 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.
•
XIN, XOUT (crystal oscillator connect) pin
Connect a crystal oscillator between XIN and XOUT.
•
INT (output for interrupt signal) 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, 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.
•
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”
.
•
VSS pin
Connect the VSS pin to GND.
Equivalent Circuits of I/O Pin
SCK
SIO
Figure 4
SCK
pin
Figure 5
SIO pin
CS
INT
Figure 6
CS pin
Figure 7
INT
pin
Seiko Instruments Inc.
3
3-WIRE REAL-TIME CLOCK
S-35190A
Block Diagram
Rev.2.4
_00
XIN
XOUT
Divider,
Oscillator
Timing generator
INT register 1
INT controller 1
Clock correction register
Comparator 1
Real-time data register
Day of
Second Minute Hour the week Day Month Year
INT
Status register 1
Status register 2
Comparator 2
Free register
Low power supply
voltage detector
Power-on
detector
Constant-voltage
circuit
INT register 2
INT controller 2
VDD
Shift register
Serial
interface
SIO
SCK
CS
VSS
Figure 8
4
Seiko Instruments Inc.
Rev.2.4
_00
Absolute Maximum Ratings
Table 2
Parameter
Power supply voltage
Input voltage
Output voltage
3-WIRE REAL-TIME CLOCK
S-35190A
Symbol
V
DD
V
IN
V
OUT
Applicable Pin
−
CS,
SCK
, SIO
SIO, INT
Rating
V
SS
−
0.3 to V
SS
+ 6.5
V
SS
−
0.3 to V
SS
+ 6.5
V
SS
−
0.3 to V
SS
+ 6.5
Unit
V
V
V
Operating ambient
−
−
40 to +85
°
C
T
opr
temperature
*1
Storage temperature
T
stg
−
−
55 to +125
°
C
*1.
Conditions with no condensation or frost. Condensation and frost cause short circuiting between pins, resulting in a
malfunction.
Caution
The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
Recommended Operation Conditions
Table 3
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Power supply voltage
*1
V
DD
Ta =
−
40 to +85
°
C
1.3
3.0
5.5
Time keeping power
V
DDT
V
DET
−
0.15
−
5.5
V
Ta =
−
40 to +85
°
C
*2
supply voltage
Crystal oscillator C
L
value C
L
−
−
6
7
pF
*1.
The power supply voltage that allows communication under the conditions shown in
Table 8
of
“ AC Electrical
Characteristics”.
*2.
The power supply voltage that allows time keeping. For the relationship with V
DET
(low power supply voltage detection
voltage), refer to
“ Characteristics (Typical Data)”.
(V
SS
= 0 V)
Unit
V
Oscillation Characteristics
Table 4
(Ta = 25°C, V
DD
= 3.0 V, V
SS
= 0 V, VT-200 crystal oscillator (C
L
= 6 pF, 32.768 kHz) manufactured by Seiko Instruments Inc.)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Oscillation start voltage
V
STA
Within 10 seconds
1.1
−
5.5
V
Oscillation start time
t
STA
−
−
−
1
s
IC-to-IC frequency
δ
IC
−
−
10
−
+10
ppm
deviation
*1
Frequency voltage
δ
V
V
DD
= 1.3 to 5.5 V
−
3
−
+3
ppm/V
deviation
External capacitance
C
g
Applied to XIN pin
−
−
9.1
pF
Internal oscillation
Applied to XOUT pin
−
8
−
pF
C
d
capacitance
*1.
Reference value
Seiko Instruments Inc.
5
MCU
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