HT1381

HOLTEK Semiconductor Inc.
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HT1380/HT1381 Serial Timekeeper Chip Features · · · · Operating voltage: 2.0V~5.5V Maximum input serial clock: 500kHz at VDD=2V, 2MHz at VDD=5V Operating current: less than 400nA at 2V, less than 1.2mA at 5V TTL compatible - V : 2.0V~V IH DD+0.3V at VDD=5V - V : -0.3V~+0.8V at V IL DD=5V Two data transmission modes: single-byte, or burst mode Serial I/O transmission All registers store BCD format HT1380: 8-pin DIP package HT1381: 8-pin SOP package · · · · Applications · Microcomputer serial clock Clock and Calendar · General Description The HT1380/HT1381 is a serial timekeeper IC which provides seconds, minutes, hours, day, date, month and year information. The number of days in each month and leap years are automatically adjusted. The HT1380/HT1381 is designed for low power consumption and can operate in two modes: one is the 12-hour mode with an AM/PM indicator, the other is the 24-hour mode. The HT1380/HT1381 has several registers to store the corresponding information with 8-bit data format. A 32768Hz crystal is required to provide the correct timing. In order to minimize the pin number, the HT1380/HT1381 use a serial I/O transmission method to interface with a microprocessor. Only three wires are required: (1) REST, (2) SCLK and (3) I/O. Data can be delivered 1 byte at a time or in a burst of up to 8 bytes. Block Diagram Pin Assignment S C L K D a ta S h ift R e g is te r R E S T C o m m a n d C o n tr o l L o g ic I/O R e a l T im e C lo c k O s c illa to r a n d D iv id e r C ir c u it X 1 X 2 1 N C 1 8 V D D N C 1 8 V D D X 1 2 7 X 1 2 7 X 2 3 6 S C L K I/O X 2 3 6 S C L K I/O V S S 4 5 R E S T V S S 4 5 R E S T H T 1 3 8 0 8 D IP H T 1 3 8 1 8 S O P October 2, 1999 PDF
Документация на HT1381 

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Дата модификации: 23.04.2006

Размер: 185.7 Кб

10 стр.

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