DS1375 Maxim, DS1375 Datasheet
DS1375
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DS1375 Summary of contents
Page 1
... Rev 2; 9/08 General Description The DS1375 digital real-time clock (RTC low-power clock/calendar that does not require a crystal. The device operates from a digital clock input pin at one of four frequencies: 32.768kHz, 8.192kHz, 60Hz, or 50Hz. It maintains 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 ...
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... 1.3V < V < 1.7V 0 (Notes 5, 6) CCA I (Notes 6, 7) CCS + 0.3V cause current to flow into the device. The input current must not CC . Otherwise, current flows out of the DS1375, raising the CC J-STD-020 Specification. = 3.3V +25°C, unless other MIN TYP MAX 1.7 3.3 5.5 1.3 5.5 0 ...
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... Note 9: A device must internally provide a hold time of at least 300ns for the SDA signal (see the V bridge the undefined region of the falling edge of SCL. Note 10: The maximum t is only met if the device does not stretch the low period (t HD:DAT Note 11: A fast-mode device can be used in a standard-mode system, but the requirement t This is automatically the case if the device does not stretch the low period of the SCL signal ...
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... I C Digital Input RTC with Alarm SDA t BUF t LOW SCL t HD:STA STOP START 2 Figure 1. Data Transfer Serial Bus CLK DIVIDER DS1375 SCL SERIAL BUS INTERFACE AND ADDRESS REGISTER SDA Figure 2. Functional Diagram 4 _____________________________________________________________________ HIGH t REPEATED SU:DAT START ...
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T = +25°C, unless otherwise noted vs. V CCS 300 250 200 150 100 50 1.7 2.2 2.7 3.2 3 vs. TEMPERATURE CCS 135.0 132.5 V 130.0 127.5 125.0 122.5 ...
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... SRAM are provided for additional user storage. When power is applied, the time and date registers are reset to 01/01/00 01 00:00:00 (MM/DD/YY DOW HH:MM:SS). The DS1375 operates as a slave device on the serial bus. Access is obtained by implementing a START condition and providing a device identification code, followed by data. Subsequent registers can be accessed sequentially until a STOP condition is execut- ed ...
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... The countdown chain is reset whenever the seconds register is written. Write transfers occur on the acknowl- edge from the DS1375. Once the countdown chain is reset, to avoid rollover issues the remaining time and date registers must be written within 1 second. The 1Hz ...
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... INTCN bit is set to logic 1, the alarm condition activates the SQW/INT signal. The match is tested on the once- per-second update of the time and date registers. The DS1375 has two additional registers (control and status) that control the RTC, alarms, and square-wave output. ALARM RATE ...
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... When ECLK is set to logic 0, the divider chain is held in reset, and the time is not allowed to advance. To syn- chronize the DS1375 time to a reference, write the ECLK bit to 0, write the time value, then write ECLK back to 1. Doing so synchronizes the time value to with- in one period of the CLK pin from the point in the inter- face protocol where the ECLK bit is written ...
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... A master device that generates the serial clock (SCL), controls the bus access, and generates the START and STOP condi- tions must control the bus. The DS1375 operates slave on the I C bus. Connections to the bus are made ...
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... I C Digital Input RTC with Alarm The DS1375 can operate in the following two modes: Slave Receiver Mode (Write Mode): Serial data and clock are received through SDA and SCL. After each byte is received, an acknowledge bit is trans- mitted ...
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... NOTE: LAST DATA BYTE IS FOLLOWED BY A NACK. <WORD ADDRESS (n)> <SLAVE ADDRESS (n)> <R/W> A XXXXXXXX A Sr 1101000 1 <DATA (n + 1)> <DATA (n + 2)> ... XXXXXXXX A XXXXXXXX A MASTER TO SLAVE SLAVE TO MASTER For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 6 TDFN-EP <DATA ( ... A XXXXXXXX A P <DATA (n + X)> A ... XXXXXXXX <DATA (n + X)> XXXXXXXX A P ...
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... Replaced the I Added the Package Information section table. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. ...