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DS1337S+C01

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
DS1337 I
2
C Serial Real-Time Clock
Note 16:
The parameter t
OSF
is the period of time that the oscillator must be stopped for the OSF bit to be set over the
voltage range of V
CC(MIN)
≤ V
CC
≤ V
CC(MAX).
.
TYPICAL OPERATING CHARACTERISTICS
(V
CC
= 3.3V, T
A
= +25°C, unless otherwise noted.)
I
CCA
vs. V
CC
0
25
50
75
100
125
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
V
CC
(V)
I
CC
(uA)
I
CC
vs. V
CC
300
400
500
600
700
800
900
1000
1.3 1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
V
CC
(V)
I
CC
(nA)
INTCN = 0
(Squarew ave on)
INTCN = 1
(Squarew ave of f )
I
CCTOSC
I
CCS
I
CCS
vs. Temperature
350
400
450
500
550
600
650
700
-40.0 -20.0 0.0 20.0 40.0 60.0 80.0
V
CC
(V)
I
CC
(nA)
INTCN = 0
(Squarew ave on)
V
CC
= 3.0V
INTCN = 1
(Squarew ave off )
OSCILLATOR FREQUENCY vs. V
CC
32768
32768.05
32768.1
32768.15
32768.2
32768.25
32768.3
32768.35
1.3 1.8 2.3 2.8 3.3 3.8 4.3 4.8
V
CC
(V)
FREQUENCY (Hz)
DS1337 I
2
C Serial Real-Time Clock
PIN DESCRIPTION
PIN
8 16
NAME FUNCTION
1 — X1
2 — X2
Connections for a Standard 32.768kHz Quartz Crystal. The internal
oscillator circuitry is designed for operation with a crystal having a specified
load capacitance (C
L
) of 6pF. For more information about crystal selection
and crystal layout considerations, refer to Application Note 58: Crystal
Considerations with Dallas Real-Time Clocks. An external 32.768kHz
oscillator can also drive the DS1337. In this configuration, the X1 pin is
connected to the external oscillator signal and the X2 pin is floated.
3 14
INTA
Interrupt Output. When enabled, INTA is asserted low when the
time/day/date matches the values set in the alarm registers. This pin is an
open-drain output and requires an external pullup resistor.
The pull up
voltage may be up to 5.5V, regardless of the voltage on V
CC
. If not used, this pin
may be left floating.
4 15 GND Ground. DC power is provided to the device on this pin.
5 16 SDA
Serial Data Input/Output. SDA is the input/output pin for the I
2
C serial
interface. The SDA pin is open-drain output and requires an external pullup
resistor.
6 1 SCL
Serial Clock Input. SCL is used to synchronize data movement on the serial
interface.
7 2
SQW/INTB
Square-Wave/Interrupt Output. Programmable square-wave or interrupt
output signal. It is an open-drain output and requires an external pullup
resistor.
The pull up voltage may be up to 5.5V, regardless of the voltage on V
CC
.
If not used, this pin may be left floating.
8 3 V
CC
DC Power. DC power is provided to the device on this pin.
— 4–13 N.C.
No Connect. These pins are not connected internally, but must be
grounded for proper operation.
TIMING DIAGRAM
DS1337 I
2
C Serial Real-Time Clock
BLOCK DIAGRAM
ALARM,
TRICKLE
CHARGE, AND
CONTROL
REGISTERS
SERIAL BUS
INTERFACE AND
ADDRESS
REGISTER
CONTROL
LOGIC
X1
X2
1Hz
1Hz/4.096kHz/8.192kHz/32.768kHz
MUX/
BUFFER
USER BUFFER
(7 BYTES)
CLOCK AND
CALENDAR
REGISTERS
"C" version only
N
N
SDA
SCL
SQW/INTB
INTA
DS1337
C
L
C
L
DETAILED DESCRIPTION
The Block Diagram shows the main elements of the DS1337. As shown, communications to and from the DS1337
occur serially over an I
2
C bus. The DS1337 operates as a slave device on the serial bus. Access is obtained by
implementing a START condition and providing a device identification code, followed by data. Subsequent
registers can be accessed sequentially until a STOP condition is executed. The device is fully accessible through
the I
2
C interface whenever V
CC
is between 5.5V and 1.8V. I
2
C operation is not guaranteed when V
CC
is below 1.8V.
The DS1337 maintains the time and date when V
CC
is as low as 1.3V.
OSCILLATOR CIRCUIT
The DS1337 uses an external 32.768kHz crystal. The oscillator circuit does not require any external resistors or
capacitors to operate. Table 1
specifies several crystal parameters for the external crystal. The Block Diagram
shows a functional schematic of the oscillator circuit. The startup time is usually less than 1 second when using a
crystal with the specified characteristics.
Table 1. Crystal Specifications*
PARAMETER SYMBOL MIN TYP MAX UNITS
Nominal Frequency f
O
32.768 kHz
Series Resistance ESR 50
k
Load Capacitance C
L
6 pF
*The crystal, traces, and crystal input pins should be isolated from RF generating signals. Refer to
Application Note 58: Crystal Considerations for Dallas Real-Time Clocks for additional specifications.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

DS1337S+C01

Mfr. #:
Buy DS1337S+C01
Manufacturer:
Maxim Integrated
Description:
IC RTC CLK/CALENDAR I2C 8-SOIC
Lifecycle:
New from this manufacturer.
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