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PDF S-35390A Data sheet ( Hoja de datos )
| Número de pieza | S-35390A | |
| Descripción | 2-WIRE REAL-TIME CLOCK | |
| Fabricantes | Seiko | |
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S-35390A
www.sii-ic.com
© SII Semiconductor Corporation, 2004-2016
2-WIRE REAL-TIME CLOCK
Rev.4.2_02
The S-35390A is a CMOS 2-wire real-time clock IC which operates with the very low current consumption in the wide range of
operation voltage. The operation voltage is 1.3 V to 5.5 V so that the S-35390A 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, the S-35390A 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.
The S-35390A has the function to correct advance / delay of the clock data speed, in the wide range, which is caused by the
crystal 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. (VDD = 3.0 V, Ta = +25°C)
• Wide range of operating voltage:
1.3 V to 5.5 V
• Built-in clock correction function
• Built-in free user register
• 2-wire (I2C-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 (built-in Cd, external Cg)
• Lead-free, Sn 100%, halogen-free*1
*1. Refer to " Product Name Structure" for details.
Applications
• Mobile game device
• Mobile AV device
• Digital still camera
• Digital video camera
• Electronic power meter
• DVD recorder
• TV, VCR
• Mobile phone, PHS
Packages
• 8-Pin SOP (JEDEC)
• 8-Pin TSSOP
• SNT-8A
1
1 page  
Rev.4.2_02
2-WIRE REAL-TIME CLOCK
S-35390A
Pin Functions
1. SDA (I/O for serial data) pin
This is a data input / output pin of I2C-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.
2. SCL (input for serial clock) pin
This pin is to input a clock pulse for I2C-bus interface. The SDA pin inputs / outputs data by synchronizing with the
clock pulse.
3. XIN, XOUT (crystal oscillator connect) pins
Connect a crystal oscillator between XIN and XOUT.
4. INT1 (output for interrupt signal 1) 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, output of user-set frequency, minute-periodical interrupt 1, minute-periodical interrupt 2, or 32.768 kHz output.
This pin has Nch open-drain output.
5. INT2 (output for interrupt signal 2) pin
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, or minute-periodical interrupt 1. This pin has Nch open-drain output.
6. 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".
7. VSS pin
Connect this VSS pin to GND.
Equivalent Circuits of Pins
SDA
SCL
Figure 5 SDA Pin
INT1, INT2
Figure 6 SCL Pin
Figure 7 INT1 Pin, INT2 Pin
5
5 Page 
Rev.4.2_02
2-WIRE REAL-TIME CLOCK
S-35390A
Configuration of Registers
1. Real-time data register
The real-time data register is a 7-byte register that stores the data of year, month, day, day of the week, hour, minute,
and second in the BCD code. To write / read real-time data 1 access, transmit / receive the data of year in B7, month,
day, day of the week, hour, minute, second in B0, in 7-byte. When you skip the procedure to access the data of year,
month, day, day of the week, read / write real-time data 2 accesses. In this case, transmit / receive the data of hour in B7,
minute, second in B0, in 3-byte.
The S-35390A transfers a set of data of time to the real-time data register when it recognizes a reading instruction.
Therefore, the S-35390A keeps precise time even if time-carry occurs during the reading operation of the real-time data
register.
Year data (00 to 99)
Start bit of real-time data 1 data access
Y1 Y2 Y4 Y8 Y10 Y20 Y40 Y80
B7 B0
Month data (01 to 12)
M1 M2 M4 M8 M10 0
B7
00
B0
Day data (01 to 31)
D1 D2 D4 D8 D10 D20 0
B7
0
B0
Day of the week data (00 to 06)
W1 W2 W4 0 0 0 0 0
B7 B0
Hour data (00 to 23 or 00 to 11)
Start bit of real-time data 2 data access
H1 H2 H4 H8 H10 H20 AM / PM 0
B7 B0
Minute data (00 to 59)
m1 m2 m4 m8 m10 m20 m40 0
B7 B0
Second data (00 to 59)
s1 s2 s4 s8 s10 s20 s40 0
B7 B0
Figure 11 Real-Time Data Register
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet S-35390A.PDF ] | |
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