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PDF PT7C43390C Data sheet ( Hoja de datos )
| Número de pieza | PT7C43390C | |
| Descripción | Real-time Clock Module | |
| Fabricantes | Pericom Semiconductor | |
| Logotipo |  |
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PT7C43390/43390C
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Real-time Clock Module
Features
Low current consumption: 0.3µA typ. (VDD=3.0V,
TA = 25°C)
Wide operating voltage range: 1.35 to 5.5 V
Minimum time keeping operation voltage: 1.25 V
Built-in clock adjustment function
Built-in free user register
2-wire (I2C-bus) 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
Built-in 32 kHz crystal for PT7C43390C
Package: SOIC-8L, TSSOP-8L, and TDFN2x3-8L
for PT7C43390; TDFN4x4-8L for PT7C43390C
Applications
Mobile game device, mobile phone
Industrial control
Electronic power meter
DVD recorder
Car navigation
IP Camera, DVR, NVR
Description
The PT7C43390 is a CMOS I2C-bus real-time clock IC,
which operates with the very low current consumption
and in the wide range of operation voltage. The
operation voltage is 1.35 V to 5.5 V so that the RTC can
be used for various power supplies from main supply to
backup battery. 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 IC has the function to correct advance / delay of the
clock data speed, in the wide range, which is caused by
the 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.
Function Table
Item
1 Oscillator
2 Time
3 Interrupt
Function
Source
Crystal*
Time display
12-hour
24-hour
Alarm interrupt pin output
Timer interrupt output
4 Programmable square wave output (Hz)
5 Communication
2-wire I2C bus
Burst mode
IC test mode
6 Control
Power-on detector
Power supply voltage detector
7 Clock calibration
80 Free register access
2015-12-0001
1
PT7C43390
External crystal
2
1Hz,2Hz,4Hz
8Hz,16Hz
32kHz
PT7C43390C
Integral crystal
2
1Hz,2Hz,4Hz
8Hz,16Hz
32kHz
PT0280-8 12/11/15
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PT7C43390/43390C
Real-time Clock Module
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DC Electrical Characteristics
( TA = -40°C to +85°C; VSS = 0V, crystal oscillator CL = 6pF, 32.768KHz, unless otherwise noted.)
Symbol
Parameter
Pin
Test Conditions
Min Typ Max Unit
VDD = 3.0V
IDD1 Current consumption 1
IDD2 Current consumption 2
VDD
VDD
Out of communication
During communication
(SCL=100kHz)
- 0.3 0.6 µA
- 3.5 8 µA
IIZH Input high leakage current
IIZL Input low leakage current
IOZH Output high leakage current
IOZL Output low leakage current
SCL,SDA
SCL,SDA
SDA,INT1,
INT2
SDA,INT1,
INT2
VIN = VDD
VIN = VSS
VOUT = VDD
VOUT = VSS
-0.5 - +0.5 µA
-0.5 - +0.5 µA
-0.5 - +0.5 µA
-0.5 - +0.5 µA
VIH Input high voltage
VIL Input low voltage
SCL,SDA
SCL,SDA
- 0.8VDD - - V
- - - 0.2VDD V
IOL1 Output low current 1
INT1
INT2
VOUT = 0.4V
VOUT = 0.4V
1.0 1.6 - mA
5 8 - mA
IOL2 Output low current 2
SDA
VOUT = 0.4V
5 8 - mA
VDD = 5.0V
IDD1 Current consumption 1
IDD2 Current consumption 2
VDD
VDD
Out of communication
During communication
(SCK=100kHz)
- 0.35 0.7 µA
- 7 14 µA
IIZH Input high leakage current
SCL,SDA
VIN = VDD
-0.5 - +0.5 µA
IIZL Input low leakage current
IOZH Output high leakage current
IOZL Output low leakage current
SCL,SDA
SDA,INT1,
INT2
SDA,INT1,
INT2
VIN = VSS
VOUT = VDD
VOUT = VSS
-0.5 - +0.5 µA
-0.5 - +0.5 µA
-0.5 - +0.5 µA
VIH Input high voltage
VIL Input low voltage
SCL,SDA
SCL,SDA
- 0.8VDD - - V
- - - 0.2VDD V
IOL1 Output low current 1
INT1
INT2
VOUT = 0.4V
1.0 1.6 - mA
6 10 - mA
IOL2 Output low current 2
SDA
VOUT = 0.4V
6 10 - mA
2015-12-0001
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PT7C43390/43390C
Real-time Clock Module
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Minute data (00 to 59): m1, m2, m4, m8, m10, m20, m40
Example: 32 minutes (m1, m2, m4, m8, m10, m20, m40, 0) = (0, 1, 0, 0, 1, 1, 0, 0)
Example: 55 minutes (m1, m2, m4, m8, m10, m20, m40, 0) = (1, 0, 1, 0, 1, 0, 1, 0)
Second data (00 to 59): s1, s2, s4, s8, s10, s20, s40
Example: 19 seconds (s1, s2, s4, s8, s10, s20, s40, 0) = (1, 0, 0, 1, 1, 0, 0, 0)
3.2. Status Register 1
Status register 1 is a 1-byte register that is used to display and set various modes. The bit configuration is shown below.
B1: BLD
This flag is set to "1" when the power supply voltage decreases to the level of detection voltage (VDET) or less. Users can detect a
drop in the power supply voltage. This flag is set to "1" once, is not set to "0" again even if the power supply increases to the level
of detection voltage (VDET) or more. This flag is read-only. When this flag is "1", be sure to initialize. Regarding the operation of
the power supply voltage detection circuit, refer to "Low Power Supply Voltage Detection Circuit".
B2: INT2, B3: INT1
This flag indicates the time set by alarm and when the time has reached it. This flag is set to "1" when the time that users set by
using the alarm interrupt function has come. The INT1 flag at alarm 1 interrupt mode and the INT2 flag at alarm 2 interrupt mode
are set to "1". Set "0" in INT1AE (B5 in the status register 2) or in INT2AE (B1 in the status register 2) after reading "1" in the
INT1 flag or in the INT2 flag. This flag is read-only. This flag is read once, is set to "0" automatically.
B4: SC1, B5: SC0
These flags are SRAM type registers, they are 2 bits as a whole, can be freely set by users.
B6: 12 / 24
This flag is used to set 12-hour or 24-hour mode. Set the flag ahead of write operation of the real-time data register in case of 24-
hour mode.
0: 12-hour mode
1: 24-hour mode
B7: RESET
The internal IC is initialized by setting this bit to "1". This bit is write-only. It is always "0" when reading. When applying the
power supply voltage to the IC, be sure to write "1" to this bit to initialize the circuit. Regarding each status of data after
initialization, refer to "Register Status after Initialization".
3.3. Status Register 2
Status register 2 is a 1-byte register that is used to display and set various modes. The bit configuration is shown below.
B7 B6 B5 B4 B3 B2 B1 B0
INT1FE INT1ME INT1AE 32kE INT2FE INT2ME INT2AE TEST
R/W R/W R/W R/W R/W R/W R/W R/W
R/W : Read/Write
B0: TEST
This is a test flag. Be sure to set this flag to "0" in use. If this flag is set to "1", be sure to initialize to set "0".
B1: INT2AE, B2: INT2ME, B3: INT2FE
These bits are used to select the output mode for the INT2 pin. Below Table shows how to select the mode. To use an alarm 2
interrupt, set alarm interrupt mode, then access the INT2 register.
Table: Output Modes for INT2 Pin
2015-12-0001
PT0280-8 12/11/15
11
11 Page | ||
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| PDF Descargar | [ Datasheet PT7C43390C.PDF ] | |
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