DS3231MZ+ MAXIM [Maxim Integrated Products], DS3231MZ+ Datasheet - Page 7

• Manufacturer Part Number: DS3231MZ+
• Manufacturer: MAXIM [Maxim Integrated Products]

8 SO
—
1
2
3
4
5
6
PIN
16 SO
5–12
13
14
1
2
3
4
32KHZ
NAME
SQW
GND
V
N.C.
V
INT/
RST
BAT
CC
INT/SQW
TOP VIEW
32KHZ
N.C.
N.C.
N.C.
N.C.
V
RST
CC
32.768kHz Output (50% Duty Cycle). This open-drain pin requires an external pullup resistor.
When enabled with the EN32KHZ bit in the Status register (0Fh), this output operates on either
power supply. This pin can be left open circuit if not used.
DC Power Pin for Primary Power Supply. This pin should be decoupled using a 0.1FF to 1.0FF
capacitor. Connect to ground if not used.
Active-Low Interrupt or 1Hz Square-Wave Output. This open-drain pin requires an external pullup
resistor connected to a supply at 5.5V or less. It can be left open if not used. This multifunction
pin is determined by the state of the INTCN bit in the Control register (0Eh). When INTCN is set to
logic 0, this pin outputs a 1Hz square wave. When INTCN is set to logic 1, a match between the
timekeeping registers and either of the alarm registers activates the INT/SQW pin (if the alarm is
enabled). Because the INTCN bit is set to logic 1 when power is first applied, the pin defaults to
an interrupt output with alarms disabled.
Active-Low Reset. This pin is an open-drain input/output. It indicates the status of V
to the V
V
output is combined with a debounced pushbutton input function. This pin can be activated by a
pushbutton reset request. It has an internal 50kI (R
external pullup resistors should be connected. If the oscillator is disabled, t
RST immediately goes high.
No Connection. These pins must be connected to ground.
Ground
Backup Power-Supply Input. When using the device with the V
source, this pin should be decoupled using a 0.1FF to 1.0FF low-leakage capacitor. When using the
device with the V
used, connect to ground. The device is UL recognized to ensure against reverse charging when
used with a primary lithium battery. Go to
PF
1
2
6
3
4
5
7
8
, for t
+
PF
RST
DS3231M
specification. As V
SO
, the RST pin is pulled high by the internal pullup resistor. The active-low, open-drain
BAT
16
15
14
13
12
11
10
9
input as the backup power source, the capacitor is not required. If V
±5ppm, I
SCL
SDA
V
GND
N.C.
N.C.
N.C.
N.C.
BAT
CC
falls below V
www.maxim-ic.com/qa/info/ul
INT/SQW
TOP VIEW
32KHZ
FUNCTION
V
RST
PF
CC
2
, the RST pin is driven low. When V
C Real-Time Clock
1
2
4
3
PU
+
) nominal value pullup resistor to V
DS3231M
SO
BAT
input as the primary power
7
6
5
8
Pin Configuration
SCL
V
SDA
GND
Pin Description
BAT
for more information.
REC
is bypassed and
CC
CC
exceeds
relative
BAT
CC
. No
is not
7