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PT7C4307 PDF даташит

Спецификация PT7C4307 изготовлена ​​​​«Pericom Semiconductor» и имеет функцию, называемую «Real-time Clock Module».

Детали детали

Номер произв PT7C4307
Описание Real-time Clock Module
Производители Pericom Semiconductor
логотип Pericom Semiconductor логотип 

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PT7C4307 Даташит, Описание, Даташиты
PT7C4307
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Real-time Clock Module (I2C Bus)
Features
Using external 32.768kHz quartz crystal
Supports I2C-Bus's high speed mode (400 kHz)
Includes time (Hour/Minute/Second) and calendar
(Year/Month/Date/Day) counter functions (BCD
code)
Programmable square wave output signal
56-byte, battery-backed, nonvolatile (NV) RAM for
data storage
Automatic power-fail detect and switch circuitry of
battery backup
Consumes less than 500nA in battery backup mode
with oscillator running
Description
The PT7C4307 serial real-time clock is a low-power
clock/calendar with a programmable square-wave output
and 56 bytes of nonvolatile RAM.
Address and data are transferred serially via a 2-wire,
bidirectional bus. The clock/calendar provides seconds,
minutes, hours, day, date, month, and year information.
The date at the end of the month is automatically
adjusted for months with fewer than 31 days, including
corrections for leap year. The clock operates in either the
24-hour or 12-hour format with AM/PM indicator.
The PT7C4307 has a built-in power sense circuit that
detects power failures and automatically switches to the
battery supply.
Table 1 shows the basic functions of PT7C4307. More
details are shown in section: overview of functions.
Table 1. Basic functions of PT7C4307
Item
Function
Source: Crystal: 32.768kHz
1 Oscillator
Oscillator enable/disable
Oscillator fail detect
Time display
2 Time
12-hour
24-hour
Century bit
3 Alarm interrupt
4 Programmable square wave output (Hz)
5 RAM
6 Battery backup
PT7C4307
-
-
-
1, 4.096k, 8.192k, 32.768k
568
2013-06-0002
PT0206-5 06/18/13
1









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PT7C4307 Даташит, Описание, Даташиты
PT7C4307
Real-time Clock Module (I2C Bus)
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Pin Assignment
PT7C4307
1 X1
VCC 8
2 X2
SQW/OUT 7
3 VBAT
SCL 6
4 GND
SDA 5
DIP-8
SOIC-8
Pin Description
Pin no.
Pin Type
Description
1 X1 I Oscillator Circuit Input. Together with X2, 32.768kHz crystal is connected between them.
2
X2
O
Oscillator Circuit Output. Together with X1, 32.768kHz crystal is connected between them.
When 32.768kHz external input, X2 must be float.
6 SCL I Serial Clock Input. SCL is used to synchronize data movement on the I2C serial interface.
5
SDA
I/O
Serial Data Input/Output. SDA is the input/output pin for the 2-wire serial interface. The SDA
pin is open-drain output and requires an external pull-up resistor.
7
SQW/OUT
O
Square Wave/Output Driver. Open drain. Four frequencies selectable: 32.768k, 8.192k,
4.096k, 1Hz when SQWE bit is set to 1.
8
VCC
P Power. Primary power for PT7C4307.
3
VBAT
P +3V Battery Power.
4
GND
P Ground.
2013-06-0002
PT0206-5 06/18/13
2









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PT7C4307 Даташит, Описание, Даташиты
PT7C4307
Real-time Clock Module (I2C Bus)
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Function Block
X1
32.768
kHz
X2
SQW/OUT
CD
OSC
CG
Counter
Chain
Control Register
VCC
VBAT
Power Manager
PT7C4307
Time Counter
(Sec,Min,Hour,Day,Date,Month,Year)
56 x 8
RAM
Address
Decoder
Address
Register
Shift Registers
I /O
Interface
(I2C)
SCL
SDA
Maximum Ratings
StorageTemperature...................................................................................................-65oCto +150oC
Ambient Temperaturewith Power Applied..........................................................-40oCto +85oC
SupplyVoltage to Ground Potential(Vcc to GND)..............................................-0.3Vto +6.5V
DC Input (All Other Inputs except Vcc & GND)..................................................-0.3Vto (Vcc+0.3V)
DC Output Voltage (SDA, /INTA, /INTB pins)....................................................-0.3Vto +6.5V
DC Output Current(FOUT).......................................................................................-0.3Vto (Vcc+0.3V)
Power Dissipation.....................................................................................................320mW
(depend on package)
Note:
Stresses greater than those listed under
MAXIMUM RATINGS may cause permanent
damage to the device. This is a stress rating
only and functional operation of the device at
these or any other conditions above those
indicated in the operational sections of this
specification is not implied. Exposure to
absolute maximum rating conditions for
extended periods may affect reliability.
Recommended Operating Conditions
Part No.
PT7C4307
Symbol
VCC
VBAT
VIH
VIL
TA
Description
Power voltage
Battery voltage
Input high level
Input low level
Operating temperature
Min Type Max Unit
4.5 5 5.5
2 - 3.5
V
2.2 - VCC+0.3
-0.3 - 0.8
-40 -
85 ºC
2013-06-0002
PT0206-5 06/18/13
3










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