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부품번호 | S35390A 기능 |
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기능 | 2-Wire Real Time Clock | ||
제조업체 | Seiko Instruments | ||
로고 | |||
전체 30 페이지수
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
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 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 kΩ
SDA
VDD
R = 1 kΩ
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.
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부품번호 | 상세설명 및 기능 | 제조사 |
S35390A | 2-Wire Real Time Clock | Seiko Instruments |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |