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PDF S35390A Data sheet ( Hoja de datos )
| Número de pieza | S35390A | |
| Descripción | 2-Wire Real Time Clock | |
| Fabricantes | Seiko Instruments | |
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Rev.1.2_00
2-WIRE REAL-TIME CLOCK
S-35390A
The S-35390A is a low-current-consumption 2-wire CMOS real-time clock IC
that features a wide operating voltage range (1.3 V to 5.5 V) and can be
driven on a variety of supply voltages, from a main supply to a backup
supply. The time keeping current consumption of 0.25 µA and minimum
time keeping operation voltage of 1.1 V enable greatly increased battery
duration.
In a system that operates on a backup battery, the free register incorporated
in the real-time clock can be used for the user backup memory function.
The user register can hold data on a supply voltage as low as 1.2 V (min.),
so the data stored in the register before the main power supply was cut can
be called any time after the voltage is restored.
This product also includes a clock adjustment function that enables wide-
ranging correction of deviation in the frequency of the crystal oscillator at a
minimum resolution of 1 ppm. Also, by combining this function with a
temperature sensor, the clock adjustment value can be set in accordance
with changes in the temperature, which makes it possible to realize a clock
function that retains a high degree of accuracy regardless of temperature
variation.
Features
• Low current consumption:
0.25 µA typ. (VDD = 3.0 V, Ta = 25°C)
• Wide operating voltage range:
1.3 to 5.5 V
• Minimum time keeping operation voltage: 1.1 V
• Built-in clock adjustment function
• Built-in free user register
• 2-wire (I2C-BUS)*1 CPU interface
• Built-in alarm interrupter
• Built-in flag generator at power down or power on
• Auto calendar up to the year 2099, automatic leap year calculation function
• Built-in constant voltage circuit
• Built-in 32 kHz crystal oscillator circuit (Cd built in, Cg external)
• Package: 8-pin SOP (JEDEC), 8-pin TSSOP, SNT-8A
*1. I2C-BUS is a trademark of Philips Electronics N.V.
Applications
• Digital still cameras
• Digital video cameras
• Electronic power meters
• DVD recorders
• TVs, VCRs
• PHS
• Mobile phones
• Car navigation
Seiko Instruments Inc.
1
1 page  
Rev.1.2_00
2-WIRE REAL-TIME CLOCK
S-35390A
Absolute Maximum Ratings
Table 2
Parameter
Power supply voltage
Input voltage
Output voltage
Operating temperature
Storage temperature
Symbol
VDD
VIN
VOUT
Topr
Tstg
Applicable Pin
SCL, SDA
SDA, INT1, INT2
Rating
VSS − 0.3 to VSS + 6.5
VSS − 0.3 to VSS + 6.5
VSS − 0.3 to VSS + 6.5
−40 to +85
−55 to +125
Unit
V
V
V
°C
°C
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 Operating Conditions
Parameter
Power supply voltage
Operating temperature
Time keeping voltage range
Register hold voltage
Minimum time keeping voltage range
Crystal oscillator CL value
*1. Reference value
Table 3
Symbol
Conditions
VDD Ta = −40 to +85°C
Topr
VDDT
VDD = 1.3 to 5.5 V
Ta = −40 to +85°C
VDH Ta = −40 to +85°C
VDDTm Ta = −40 to +85°C
CL
Min.
1.3
−40
VDDTm
VDDTm
0.5 *1
Typ.
3.0
+25
Max.
5.5
+85
5.5
5.5
1.1
7.0
Unit
V
°C
V
V
V
pF
Oscillation Characteristics
Table 4
(Ta = 25°C, VDD = 3.0 V, DS-VT-200 crystal oscillator (CL = 6 pF, 32,768 Hz) manufactured by Seiko Instruments Inc.)
Parameter
Symbol
Conditions
Min. Typ. Max. Unit
Oscillation start voltage
VSTA Within 10 seconds
1.1
5.5 V
Oscillation start time
IC-to-IC frequency deviation *1
tSTA VDD = 3.0 V
δIC
1s
−10 +10 ppm
Frequency voltage deviation
δV VDD = 1.3 to 5.5 V −3 +3 ppm/V
Internal oscillation capacitance (1)
Cg Applied to XIN pin 0 9.1 pF
Internal oscillation capacitance (2)
*1. Reference value
Cd Applied to XOUT pin 8 pF
Seiko Instruments Inc.
5
5 Page 
Rev.1.2_00
2-WIRE REAL-TIME CLOCK
S-35390A
2. Status register_1
Status register_1 is an 8-bit register that is used to display and set various modes. The bit configuration is
shown below.
B7 B6 B5 B4 B3 B2 B1 B0
MSB
POC
BLD
INT2
INT1
SC1
SC0
12/24
RESET
LSB
R R R R R/W R/W R/W W
R: Read-enabled
W: Write-enabled
R/W: Read/write-enabled
Figure 9 Status Register_1
B7: POC
This flag is set to “1” at power-on. Once this flag is set to “1”, it is not set to “0” even
when the power supply voltage reaches or exceeds the detection voltage (VDET). This
flag is read-only and can be read by the status register_1 access command. Once it is
read, it is automatically set to “0”. When the flag is “1”, it must be initialized. For the
method of initialization, refer to “Initialization at Power-on and Power-on Detector”.
B6: BLD
If the power supply voltage detector detects a voltage of detection voltage (VDET) or
less this flag is set to “1”, which enables the detection of a power supply voltage drop.
Once this flag is set to “1”, it is not set to “0” even when the power supply voltage
reaches or exceeds the detection voltage (VDET). This flag is read-only and can be
read by the status register_1 access command. Once it is read, it is automatically set
to “0”. When the flag is “1”, it must be initialized. For the method of initialization, refer
to “Initialization at Power-on and Power-on Detector”, and for the operation of the
power supply voltage detector, refer to “Power Supply Voltage Detector”.
B5, B4: INT2, INT1
When the interrupt signal is output from the INT1 or INT2 pin using the alarm
interrupt function, for an interrupt signal output from the INT1 pin, the INT1 flag is set
to “1”, and for an interrupt signal output from the INT2 pin, the INT2 flag is set to “1”.
B3, B2: SC1, SC0
These flags configure a 2-bit SRAM type register that can be freely set by users. They
are read and written within the operating voltage range (1.3 to 5.5 V).
B1: 12/24
This flag is used to set 12-hour or 24-hour expression.
0: 12-hour expression
1: 24-hour expression
B0: RESET By setting this bit to “1”, the internal IC is initialized. This is a write-only bit and is
always “0” when it is read. Be sure to write “1” to the reset flag when applying the
power supply voltage to the IC.
Seiko Instruments Inc.
11
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