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DS1390 Datasheet

  • DS1390

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

  • 742.60KB

  • MAXIM   MAXIM

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Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
The DY/DT bits (bit 6 of the alarm day/date registers)
control whether the alarm value stored in bits 0 to 5 of
that register reflects the day of the week or the date of
the month. If DY/DT is written to logic 0, the alarm is the
result of a match with date of the month. If DY/DT is
written to a logic 1, the alarm is the result of a match
with day of the week.
When the RTC register values match alarm register set-
tings, the alarm-flag (AF) bit is set to logic 1. If the
alarm-interrupt enable (AIE) is also set to logic 1 and
the INTCN bit is set to logic 1, the alarm condition acti-
vates the SQW/INT signal.
Since the contents of register 08h are expected to nor-
mally contain a match value of 00鈥?9 decimal, the
codes F[0鈥?], and FF have been used to tell the part to
mask the tenths or hundredths of seconds accordingly.
Power-Up/Down, Reset, and
Pushbutton Reset Functions
A precision temperature-compensated reference and
comparator circuit monitors the status of V
CC
. When an
out-of-tolerance condition occurs, an internal power-fail
signal is generated that blocks read/write access to the
device and forces the
RST
pin (DS1391/DS1393 only)
low. When V
CC
returns to an in-tolerance condition, the
internal power-fail signal is held active for t
RST
to allow
the power supply to stabilize, and the
RST
(DS1391/
DS1393 only) pin is held low. If the
EOSC
bit is set to
logic 1 (to disable the oscillator in battery-backup
mode), the internal power-fail signal and the
RST
pin is
kept active for t
RST
plus the startup time of the oscillator.
The DS1391/DS1393 provide for a pushbutton switch to
be connected to the
RST
output pin. When the
DS1391/DS1393 are not in a reset cycle, it continuously
monitors the
RST
signal for a low-going edge. If an
edge is detected, the part debounces the switch by
pulling the
RST
pin low and inhibits read/write access.
After PB
DB
has expired, the part continues to monitor
the
RST
line. If the line is still low, it continues to monitor
the line looking for a rising edge. Upon detecting
release, the part forces the
RST
pin low and holds it low
for an additional PB
DB
.
DS1390/DS1391/DS1392/DS1393
____________________________________________________________________
15

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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