HT1381 DATASHEET PDF

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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Maximum input serial clock: In total, 16 clock pulses are needed for a single byte mode and 72 for burst mode. However, Holtek assumes no responsibility arising from the use of the specifications described. 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.

If used generally, unpredictable conditions may occur. When this bit is set to logic 1, the clock oscillator is stopped and the chip goes into a low-power standby mode. A Hz crystal is required to provide the correct timing.

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These are stress ratings only. The information appearing in this Data Sheet is believed to be accurate at the time of publication. The Write Protect bit cannot be written to in the burst mode. Pad Description Pad No.

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The data bit outputs on the falling edge of the next eight SCLK cycles. Data outputs are read starting with bit 0. The data transfer is illustrated on the next page.

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The Write Protect Register should be set first before restarting the system or before writing the new data to the system, and it should set as logic 1 in the read cycle.

The value of the capacity depends on how accurate the crystal is Holtek reserves the right to alter its products without prior notification. 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. The REST pin is also used to terminate either single-byte or burst mode data format.

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Taipei Office 5F, No. The test mode is used by Holtek only for testing purposes. The value of the capacity depends on how accurate the crystal is. The read or write operating flowcharts are shown on the next page.

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These bits control the operation of the oscillator and so data can be written to the register array. Data inputs are entered starting with bit 0. Data can be written into the designated register only if the Write Protect signal WP is set to logic 0. The number of days in each month and leap years are automatically adjusted.

Data can be de. Both input and output data starts with bit 0. Copy your embed code and put on your site: For data input, the data must be read after the rising edge of SCLK.

When this bit is written to logic 0, the clock will start. Refer to the suggestion table of page 7. This is to determine whether a read, write, or test cycle is operated and whether a single byte or burst mode transfer is to occur. This table illustrates the correlation between Command Byte and their bits: One is in single-byte mode ad the other is in multiple-byte mode.

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Then, choose either single mode or burst mode to input the data Data can be de- livered 1 byte at datqsheet time burst bytes When D5 is logic 1, it is PM, datashet it? For the most up-to-date information, please visit our web site at http: A Hz crystal is required to provide the correct timing. We suggest that you can follow the table on the next page. Refer to the table shown below and follow the steps to write the data to the chip.

Holtek Semicon HT – PDF Datasheet – Real-time Clocks In Stock |

Data contained in the clock register is in binary coded decimal format. Fatasheet it is set as? Additional SCLK cycles are ignored. All other trademarks are the property of their respective owners. Only three wires are required:. There are eight datwsheet used to control the month data, etc. These two bits should first be specified in order to read from and write to the register array properly. Holtek reserves the right to alter its products without prior notification.

Data can be delivered 1 byte at a time or in a burst of up to 8 bytes. A Hz crystal is required to. The REST pin must be taken low again after the transfer operation is completed.