DS1343_1112 Datasheet, PDF (8/20 Pages) Maxim Integrated Products – Low-Current SPI/3-Wire RTCs

Low-Current SPI/3-Wire RTCs
TOP VIEW
VBAT 1
N.C. 2
X1 3
N.C. 4
X2 5
N.C. 6
INT0 7
N.C. 8
INT1 9
GND 10
DS1343
DS1344
TSSOP
Pin Configurations
TOP VIEW
20 V_CC
19 N.C.
18 PF
17 N.C.
16 SDO
15 SDI
14 SCLK
13 N.C.
12 CE
11 SERMODE
14 13 12 11 10 9 8
DS1343
DS1344
+
EP
1234567
TDFN
(3mm × 3mm)
PIN
TSSOP TDFN-EP
1
1
2, 4, 6, 8,
13, 17, 19
5
3
2
5
3
7
4
9
6
NAME
VBAT
N.C.
X1
X2
INT0
INT1
Pin Descriptions
FUNCTION
Battery Input for Standard +3V Lithium Cell or Other Energy Source. UL recognized
to ensure against reverse charging current when used in conjunction with a primary
lithium battery.
No Connection. N.C. pins can be connected to GND to reduce noise around the
crystal inputs.
Connections for Standard 32.768kHz Quartz Crystal (see the Crystal Characteristics
table). The devices can also be driven by an external 32.768kHz oscillator. In this
configuration, the X1 pin is connected to the external oscillator and the X2 pin is left
unconnected.
Active-Low Interrupt 0 Output. INT0 is an active-low output that can be used as
an interrupt output to a processor. INT0 can be programmed to be asserted by
only Alarm 0, or can be programmed to be asserted by either Alarm 0 or Alarm 1.
INT0 remains low as long as the status bit causing the interrupt is present and the
corresponding interrupt enable bit is set. INT0 operates when the component is
powered by VCC or VBAT. INT0 is an open-drain output and requires an external
pullup resistor.
Active-Low Interrupt 1 Output. INT1 is an active-low output that can be used either
as an interrupt output to a processor or a 32kHz square-wave output. INT1 can be
programmed to be asserted by Alarm 1 only. INT1 remains low as long as the status
bit causing the interrupt is present and the corresponding interrupt enable bit is set.
INT1 operates when the component is powered by VCC or VBAT. INT1 is an open-
drain output and requires an external pullup resistor.
8