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S35390A 데이터시트 PDF




Seiko Instruments에서 제조한 전자 부품 S35390A은 전자 산업 및 응용 분야에서
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부품번호 S35390A 기능
기능 2-Wire Real Time Clock
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S35390A 데이터시트, 핀배열, 회로
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




S35390A pdf, 반도체, 판매, 대치품
2-WIRE REAL-TIME CLOCK
S-35390A
„ Block Diagram
Rev.1.2_00
XIN
XOUT
Oscillator
Division, timing
generator
INT1 register_1
INT1 controller
VDD
VSS
Clock adjustment register
Status register_1
Status register_2
Power supply
voltage
detector
Constant
voltage circuit
Comparator 1
Realtime data register
Day of
Second Minute Hour week Day Month Year
Comparator 2
INT1 register_2
INT2 controller
Shift register
Serial interface
Figure 4
INT1
INT2
SDA
SCL
4 Seiko Instruments Inc.

4페이지










S35390A 전자부품, 판매, 대치품
Rev.1.2_00
2-WIRE REAL-TIME CLOCK
S-35390A
„ AC Electrical Characteristics
Table 7 Measurement Conditions
Input pulse voltage
Input pulse rise/fall time
Output determination voltage
Output load
0.1 × VDD to 0.9 × VDD
20 ns
0.5 × VDD
100 pF + pull-up resistor 1 k
SDA
VDD
R = 1 k
C = 100 pF
Remark The power supplies of the IC
and load have the same
electrical potential.
Figure 5 Output Load Circuit
Table 8 AC Characteristics
(Ta = −40 to +85°C)
Parameter
Symbol VDD = 1.3 to 5.5 V
VDD = 3.0 to 5.5 V Unit
Min. Typ. Max. Min. Typ. Max.
SCL clock frequency
fSCL
0
100
0
400 kHz
SCL clock “L” time
tLOW
4.7
1
  µs
SCL clock “H” time
SDA output delay time *1
tHIGH 4   0.9   µs
tPD   3.5   0.9 µs
Start condition setup time
tSU. STA 4.7   0.6   µs
Start condition hold time
tHD. STA
4
  0.6   µs
Data input setup time
tSU. DAT 250
100
ns
Data input hold time
tHD. DAT
0

0
  ns
Stop condition setup time
tSU. STO 4.7
 µs
SCL and SDA rise time
tR   1   0.3 µs
SCL and SDA fall time
tF   0.3   0.3 µs
Bus release time
tBUF 4.7   1.3   µs
Noise suppression time
tI   100   50 ns
*1. Since the output format of the SDA pin is Nch open-drain output, the SDA output delay time is determined
by the values of the load resistance (RL) and load capacity (CL) outside the IC. Therefore, use this value
only as a reference value.
Seiko Instruments Inc.
7

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부품번호상세설명 및 기능제조사
S35390A

2-Wire Real Time Clock

Seiko Instruments
Seiko Instruments

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