DS3234S- MAXIM [Maxim Integrated Products], DS3234S- Datasheet - Page 8

• Manufacturer Part Number: DS3234S-
• Description: Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM
• Manufacturer: MAXIM [Maxim Integrated Products]

Extremely Accurate SPI Bus RTC with
Integrated Crystal and SRAM
8
2, 7–14
18, 20
PIN
15
16
17
19
1
3
4
5
6
_____________________________________________________________________
NAME
32kHz
DOUT
SCLK
GND
V
N.C.
V
DIN
/SQW
BAT
CC
Active-Low Chip Select Input. Used to select or deselect the device.
No Connection. Not connected internally. Must be connected to ground.
32kHz Push-Pull Output. If disabled with either EN32kHz = 0 or BB32kHz = 0, the state of the 32kHz pin will
be low.
DC Power Pin for Primary Power Supply. This pin should be decoupled using a 0.1μF to 1.0μF capacitor.
Active-Low Interrupt or Square-Wave Output. This open-drain pin requires an external pullup resistor. 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 square wave and its frequency is
determined by RS2 and RS1 bits. When INTCN is set to logic 1, then a match between the timekeeping
registers and either of the alarm registers activates the
INTCN bit is set to logic 1 when power is first applied, the pin defaults to an interrupt output with alarms
disabled. The pullup voltage can be up to 5.5V, regardless of the voltage on V
left floating.
Active-Low Reset. This pin is an open-drain input/output. It indicates the status of V
V
pushbutton input function. This pin can be activated by a pushbutton reset request. It has an internal 50k
nominal value pullup resistor to V
if the crystal oscillator is disabled, t
Ground
Backup Power-Supply Input. If V
V
when used with a lithium battery. Go to www.maxim-ic.com/qa/info/ul.
SPI Data Input. Used to shift address and data into the device.
SPI Clock Input. Used to control timing of data into and out of the device. Either clock polarity can be used.
The clock polarity is determined by the device based on the state of SCLK when
20 are electrically connected together internally.
SPI Data Output. Data is output on this pin when the device is in read mode; CMOS push-pull driver.
BAT
PF
specification. As V
pin is driven high impedance. The active-low, open-drain output is combined with a debounced
pin and the battery can cause improper operation. UL recognized to ensure against reverse charging
CC
falls below V
BAT
CC
RST
. No external pullup resistors should be connected. On first power-up, or
is not used, connect to ground. Diodes placed in series between the
PF
is bypassed and
, the
FUNCTION
pin is driven low. When V
/SQW pin (if the alarm is enabled). Because the
immediately goes high.
CC
CC
exceeds V
. If not used, this pin can be
Pin Description
CC
goes low. Pins 18 and
relative to the
PF
, for t
RST
, the