PT7C43390AWEX

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 www.diodes.com 28 August 2020 © Diodes Incorporated 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 www.diodes.com 29 August 2020 © Diodes Incorporated 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 www.diodes.com 30 August 2020 © Diodes Incorporated 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) PT7C43390 Document Number DS40502 Rev 2-2 www.diodes.com 31 August 2020 © Diodes Incorporated 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 www.diodes.com 32 August 2020 © Diodes Incorporated 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 www.diodes.com 33 August 2020 © Diodes Incorporated 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 www.diodes.com 34 August 2020 © Diodes Incorporated 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 www.diodes.com 35 August 2020 © Diodes Incorporated 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 www.diodes.com 36 August 2020 © Diodes Incorporated PT7C43390 Packaging Mechanical 8-TDFN (ZE) PT7C43390 Document Number DS40502 Rev 2-2 www.diodes.com 37 August 2020 © Diodes Incorporated PT7C43390 8-TSSOP (L) PT7C43390 Document Number DS40502 Rev 2-2 www.diodes.com 38 August 2020 © Diodes Incorporated 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