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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The number of days in each month and leap years are automatically adjusted. A Hz crystal is required to provide the correct timing. Only three wires are catasheet Data can be delivered 1 byte at a time or in a burst of up to 8 bytes. Pad Description Pad No. These are stress ratings only.

fatasheet Stresses exceeding the range specified under? Functional operation of this device at other conditions datssheet those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability. The clock halt bit must be set to logic 1 oscillator disabled.

Data contained in the clock register is in binary coded decimal format. 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. 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.

HT1380/HT1381 — Serial Timekeeper Chip

Refer to the table shown below and follow the steps to write the data to the chip. This table illustrates the correlation between Command Byte and their bits: One is in single-byte mode ad the other is in ht1831 mode. These bits control the operation of the oscillator and so vatasheet can be written to the register array.


These two bits should first be specified in order to read from and write to the register array properly. When it is set as? There are eight registers used to control the month data, etc. The test mode is used by Holtek only for testing purposes. If used generally, unpredictable conditions may occur.

Data can be written into the designated register only if the Write Protect signal WP is set to logic 0. 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 datashete in the read cycle. Daatasheet Write Protect bit cannot be written to in the burst mode.

When this bit is set to logic 1, the clock oscillator is stopped and the chip goes into a low-power standby mode. When this bit is written to logic 0, the clock will start. When this bit is in high level, the hour mode is selected otherwise it?

When D5 is logic 1, it is PM, datashet it? The REST pin is also used to terminate either single-byte or burst mode data format.

HT Datasheet, HT PDF – Free Datasheets, Serial Timekeeper Chip

The input signal of SCLK is a sequence of a falling edge followed by a rising ht1318 and it is used to synchronize the register data whether read or write. For data input, the data must be read after the rising edge of SCLK. The data transfer is illustrated on the next page. Additional SCLK cycles are ignored.

Data inputs are entered starting with bit 0. The data bit outputs on the falling edge of the next eight SCLK cycles. 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 outputs are read starting with bit 0. In order to obtain the correct frequency, two additional load capacities C1, C2 are needed. The value of the capacity depends on how accurate the crystal is. We suggest that you can follow the table on the next page.

The REST pin must be taken low again after the hht1381 operation is completed. In dwtasheet, 16 clock pulses are needed for a single byte mode and 72 for burst mode. Both input and output data starts with bit 0. Then, choose either single mode or burst mode to input the data. Datashete read or write operating flowcharts are shown on the next page. Refer to the suggestion table of page 7.

HT1381-8DIPLF PDF Datasheet浏览和下载

Taipei Office 5F, No. The information appearing in this Data Sheet is believed to be accurate at the time of publication.

However, Holtek assumes no responsibility arising from datasyeet use of the specifications described. 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 yt1381.

Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http: