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DS1390 Datasheet

  • DS1390

  • Low-Voltage SPI/3-Wire RTCs with Trickle Charger

  • MAXIM   MAXIM

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Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
Functional Diagram
DS1390/DS1391/DS1392/DS1393
X1
X2
32,768Hz
CRYSTAL
OSCILLATOR
HUNDREDTHS-OF-
SECONDS
GENERATOR
V
CC
GND
V
BACKUP
V
CC
LEVEL DETECT,
POWER SWITCH,
WRITE PROTECT,
TRICKLE CHARGER
REAL-TIME CLOCK
WITH HUNDREDTHS
OF SECONDS
SQUARE-WAVE RATE
SELECTOR, INT, MUX,
RST OUTPUT
SQW/INT (DS1390/93)
RST (DS1391/93)
SQW (DS1392)
(DS1390/91) CS
(DS1392/93) (CE)
SCLK
(DS1390/91) DIN
(DS1390/91) DOUT
(DS1392/93) I/O
BUS
INTERFACE
CONTROL/STATUS
REGISTERS
TRICKLE REGISTER
ALARM REGISTERS
DS1390/DS1391/
DS1392/DS1393
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 inter-
face for the DS1392 and DS1393. The clocks/calendars
provide hundredths of seconds, seconds, minutes,
hours, day, date, month, and year information. The
alarm functions are performed off all timekeeping regis-
ters, 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 correc-
tions 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 volt-
age reference that detects power failures and automati-
cally 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.
Operation
The DS1390/DS1391 operate 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
sec-
tion). The devices are fully accessible and data can be
written and read when V
CC
is greater than V
PF
.
11
____________________________________________________________________

DS1390 PDF文件相關(guān)型號

DS1390-DS1393,DS1390U-18,DS1390U-3,DS1391U-18,DS1391U-3,DS1392U-18,DS1392U-3,DS1393U-18,DS1393U-3

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