General Description. The HT is a serial timekeeper IC which provides seconds, minutes, hours, day, date, month and year information. HT datasheet, HT circuit, HT data sheet: HOLTEK – Serial Timekeeper Chip,alldatasheet, datasheet, Datasheet search site for Electronic. HTSOPLF from HOLTEK >> Specification: Timekeeper IC, Date Time Format (Date/Month/Year Technical Datasheet: HTSOPLF Datasheet.

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For data input, the data must be read after the rising edge of SCLK. Refer to the table shown below and follow the steps to write the data to the chip. Data can be de- livered 1 byte at a time burst bytes Two data transmission modes: Additional SCLK cycles are ignored. REST remains at high level. Two modes are available for transferring the data between the microprocessor and the Command byte For each data transfer, a Command Byte is initiated to specify which register is accessed.

There are eight registers used to control the month data, etc. The input signal of SCLK is a sequence of a falling edge followed by a rising edge and it is used to synchronize the register data whether read or write.

Holtek Semiconductor Inc. HT Series Datasheets. HT, HT Datasheet.

However, Holtek assumes no responsibility arising from the use of the specifications described. Taipei Office 5F, No. A Hz crystal is required to provide the correct timing. When it datashest set as? A Hz crystal is required to. The clock halt bit must be set to logic 1 oscillator disabled.


The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. These are stress ratings only. If used generally, unpredictable conditions may occur. Data outputs are read starting with bit 0. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.

Holtek reserves the right to alter its products without prior notification.

Copy your embed code and put on your site: The information appearing in this Data Sheet is believed to be accurate at the time of publication. For the most up-to-date information, please visit our web site at http: Pad Description Pad No.

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Download datasheet Kb Share this page. Note that the first data bit to be transmitted on the first falling edge after the last bit of the read command byte is written. Data can be written into the designated register only if the Write Protect signal WP is set to logic 0.


Refer to the suggestion table of page 7. Refer to the table shown below and hg1381 the steps to write the data to the chip. The read or write operating flowcharts are shown on the next page. In order to obtain the correct frequency, two additional load capacities C1, C2 are needed. We suggest dataheet you can follow the table on the next page. Both input and output data starts with bit 0.

HT1381 Datasheet PDF

Only three wires are required:. In order to obtain the correct frequency, two additional load capacities C1, C2 are h1t381. Data contained in the clock register is in binary coded decimal format. The value of the capacity depends on how accurate the crystal is. These bits control the operation of the oscillator and so data can be written to the register array. In total, 16 clock pulses are needed for a single byte mode and 72 for burst mode. Data can be delivered 1 byte at a time or in a burst of up to 8 bytes.