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DS1393U-33+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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DS1393U-33+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
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11 / 25 page  Detailed Description The DS1390/DS1391/DS1392/DS1393 RTCs are low- power clocks/calendars with alarms. Address and data are transferred serially through a 4-wire SPI interface for the DS1390 and DS1391 and through a 3-wire interface for the DS1392 and DS1393. The DS1390/DS1391 oper- ate as a slave device on the SPI serial bus. The DS1392/DS1393 operate using a 3-wire synchronous serial bus. Access is obtained by selecting the part by the CS pin (CE on DS1392/DS1393) and clocking data into/out of the part using the SCLK and DIN/DOUT pins (I/O on DS1392/DS1393). Multiple-byte transfers are supported within one CS low period (see the SPI Serial- Data Bus section). The clocks/calendars provide hun- dredths of seconds, seconds, minutes, hours, day, date, month, and year information. The alarm functions are performed off all timekeeping registers, allowing the user to set high resolution alarms. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clocks operate in either the 24-hour or 12-hour format with an AM/PM indicator. All four devices have a built-in temperature-compensated voltage reference that detects power failures and automatically switches to the battery supply. Additionally, the devices can provide trickle charging of the backup voltage source, with selectable charging resistance and diode voltage drops. Low-Voltage SPI/3-Wire RTCs with Trickle Charger ____________________________________________________________________ 11 Functional Diagram BUS INTERFACE VCC LEVEL DETECT, POWER SWITCH, WRITE PROTECT, TRICKLE CHARGER 32,768Hz CRYSTAL OSCILLATOR (DS1390/91) DIN (DS1390/91) DOUT (DS1392/93) I/O X2 SCLK VCC GND VBACKUP X1 (DS1390/91) CS (DS1392/93) (CE) SQUARE-WAVE RATE SELECTOR, INT, MUX, RST OUTPUT HUNDREDTHS-OF- SECONDS GENERATOR REAL-TIME CLOCK WITH HUNDREDTHS OF SECONDS TRICKLE REGISTER SQW/INT (DS1390/93) CONTROL/STATUS REGISTERS ALARM REGISTERS RST (DS1391/93) SQW (DS1392) DS1390/DS1391/ DS1392/DS1393 |
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