PT7C43390
Real-time Clock Module
Features
Description
Applications
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain target frequency (in case the clock is fast)
Caution The figure range which can be corrected is that the calculated value is from 0 to 64.
*1. Convert this value to be set in the clock correction register. For how to convert, refer to "Calculation example 1".
*2. Measurement value when 1 Hz clock pulse is output from the INT pin.
*3. Target value of average frequency when the clock correction function is used.
*4. Refer to "Function to Clock Correction".
Calculation example 1
Convert the correction value "106" to 7-bit binary and obtain "1101010b".
Reverse the correction value "1101010b" and set it to B7 to B1 of the clock correction register.
Thus, set the clock correction register:
(B7, B6, B5, B4, B3, B2, B1, B0) = (0, 1, 0, 1, 0, 1, 1, 0)
b. If current oscillation frequency < target frequency (in case the clock is fast)
Caution The figure range which can be corrected is that the calculated value is from 0 to 62.
Calculation example 2
Thus, set the clock correction register:
(B7, B6, B5, B4, B3, B2, B1, B0) = (1, 1, 0, 1, 1, 0, 0, 0)
Calculation example 3
PT7C43390
Document Number DS40502 Rev 2-2
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PT7C43390
10.3. How to confirm a setting value for a register and the result of correction
Confirmation of the clock correction
Measure a and b by using the frequency counter*1. Calculate the average frequency (Tave) based on the measurement results.
B0 = 0, Tave
Calculate the error of the clock based on the average frequency (Tave). The following shows an example for confirmation.
Confirmation example: When B0 =0, 66h is set
Measurement results: a = 1.000080 Hz, b = 0.998493 Hz
Calculating the average frequency allows to confirm the result of correction.
*1. Use a high-accuracy frequency counter of 7 digits or more.
Caution Measure the oscillation frequency under the usage conditions.
11. Serial Interface
11.1. I2C-bus Serial Interface
a. Start condition
b. Stop condition
Start / Stop Conditions
PT7C43390
Document Number DS40502 Rev 2-2
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PT7C43390
c. Data transfer and acknowledgment signal
Output Timing of Acknowledgment Signal
Data reading in the PT7C43390
Example of Data Reading 1 (1-Byte Data Register)
PT7C43390
Document Number DS40502 Rev 2-2
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PT7C43390
Example of Data Reading 2 (3-Byte Data Register)
Data writing in the PT7C43390
Example of Data Writing 1 (1-Byte Data Register)
Example of Data Reading 2 (3-Byte Data Register)
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Document Number DS40502 Rev 2-2
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PT7C43390
d. Data access
Real-time data 1 access
*1. Set NO_ACK = 1 when reading.
*2. Transmit ACK = 0 from the master device to the RTC when reading.
Real-Time Data 1 Access
Real-time data 2 access
*1. Set NO_ACK = 1 when reading.
*2. Transmit ACK = 0 from the master device to the RTC when reading.
Real-Time Data 2 Access
Status register 1 access and status register 2 access
*1. 0: Status register 1 selected, 1: Status register 2 selected
*2. Set NO_ACK = 1 when reading.
Status Register 1 Access and Status Register 2 Access
INT1 register access and INT2 register access
PT7C43390
Document Number DS40502 Rev 2-2
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PT7C43390
*1. 0: INT1 register selected, 1: INT2 register selected
*2. Set NO_ACK = 1 when reading.
*3. Transmit ACK = 0 from the master device to the RTC when reading.
INT1 Register Access and INT2 Register Access
*1. 0: INT1 register selected, 1: INT2 register selected
*2. Set NO_ACK = 1 when reading.
INT1 Register and INT2 Register (Data Register for Output Frequency) Access
Clock correction register access
*1. Set NO_ACK = 1 when reading.
Clock Correction Register Access
PT7C43390
Document Number DS40502 Rev 2-2
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August 2020
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PT7C43390
Free register access
*1. Set NO_ACK = 1 when reading.
Free Register Access
12. Reset After Communication Interruption
Figure How to Reset
PT7C43390
Document Number DS40502 Rev 2-2
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PT7C43390
13. Flowchart of Initialization and Example of Real-time Data Set-up
*1. Do not communicate for 0.5 seconds since the power-on detection circuit is in operation.
*2. Reading the real-time data 1 should be completed within 1 second after setting the real-time data 1.
Example of Initialization Flowchart
PT7C43390
Document Number DS40502 Rev 2-2
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PT7C43390
14. Examples of Application Circuits
Caution: Start communication under stable condition after power-on the power supply in the system.
Caution: The above connection diagrams do not guarantee operation. Set the constants after performing sufficient evaluation using the actual
application.
Examples of Application Circuits for PT7C43390
Part Marking
L Package
W Package
ZE Package
Top mark not available at this time. To obtain advance information regarding the top mark, please contact your local sales representative.
PT7C43390
Document Number DS40502 Rev 2-2
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August 2020
© Diodes Incorporated
PT7C43390
Packaging Mechanical
8-TDFN (ZE)
PT7C43390
Document Number DS40502 Rev 2-2
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August 2020
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PT7C43390
8-TSSOP (L)
PT7C43390
Document Number DS40502 Rev 2-2
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August 2020
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PT7C43390
8-SOIC (W)
Ordering Information
Part Number
PT7C43390ZEEX
PT7C43390LEX
PT7C43390WEX
Package Code
ZE
L
W
Package Description
8-pin, 2x3 (TDFN)
8-pin, 173mil wide (TSSOP)
8-pin, 150mil wide (SOIC)
Notes:
1.
No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2.
See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3.
Halogen- and Antimony-free "Green” products are defined as those which contain
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