DS1302 Datasheet PDF - Maxim Integrated

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DS1302
Maxim Integrated

Part Number DS1302
Description Trickle-Charge Timekeeping Chip
Page 13 Pages


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DS1302
Trickle-Charge Timekeeping Chip
BENEFITS AND FEATURES
Completely Manages All Timekeeping Functions
o Real-Time Clock Counts Seconds,
Minutes, Hours, Date of the Month, Month,
Day of the Week, and Year with Leap-Year
Compensation Valid Up to 2100
o 31 x 8 Battery-Backed General-Purpose
RAM
Simple Serial Port Interfaces to Most
Microcontrollers
o Simple 3-Wire Interface
o TTL-Compatible (VCC = 5V)
o Single-Byte or Multiple-Byte (Burst Mode)
Data Transfer for Read or Write of Clock or
RAM Data
Low Power Operation Extends Battery Backup
Run Time
o 2.0V to 5.5V Full Operation
o Uses Less Than 300nA at 2.0V
8-Pin DIP and 8-Pin SO Minimizes Required
Space
Optional Industrial Temperature Range: -40°C
to +85°C Supports Operation in a Wide Range
of Applications
Underwriters Laboratories® (UL) Recognized
PIN CONFIGURATIONS
TOP VIEW
VCC2
X1
X2
GND
1
2
3
4
8 VCC1
7 SCLK
6 I/O
5 CE
DIP (300mils)
VCC2
X1
X2
GND
1
2
3
4
8 VCC1
7 SCLK
6 I/O
5 CE
SO (208 mils/150 mils)
ORDERING INFORMATION
PART
TEMP RANGE
DS1302+
0°C to +70°C
DS1302N+
-40°C to +85°C
DS1302S+
0°C to +70°C
DS1302SN+
-40°C to +85°C
DS1302Z+
0°C to +70°C
DS1302ZN+
-40°C to +85°C
PIN-PACKAGE
8 PDIP (300 mils)
8 PDIP (300 mils)
8 SO (208 mils)
8 SO (208 mils)
8 SO (150 mils)
8 SO (150 mils)
TOP MARK*
DS1302
DS1302
DS1302S
DS1302S
DS1302Z
DS1302ZN
+Denotes a lead-free/RoHS-compliant package.
*An N anywhere on the top mark indicates an industrial temperature grade device. A + anywhere on the top mark indicates a lead-free device.
UL is a registered trademark of Underwriters Laboratories, Inc.
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DS1302 Trickle-Charge Timekeeping Chip
DETAILED DESCRIPTION
The DS1302 trickle-charge timekeeping chip contains a real-time clock/calendar and 31 bytes of static RAM. It
communicates with a microprocessor via a simple serial interface. The real-time clock/calendar provides seconds,
minutes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for
months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or
12-hour format with an AM/PM indicator.
Interfacing the DS1302 with a microprocessor is simplified by using synchronous serial communication. Only three
wires are required to communicate with the clock/RAM: CE, I/O (data line), and SCLK (serial clock). Data can be
transferred to and from the clock/RAM 1 byte at a time or in a burst of up to 31 bytes. The DS1302 is designed to
operate on very low power and retain data and clock information on less than 1µW.
The DS1302 is the successor to the DS1202. In addition to the basic timekeeping functions of the DS1202, the
DS1302 has the additional features of dual power pins for primary and backup power supplies, programmable
trickle charger for VCC1, and seven additional bytes of scratchpad memory.
OPERATION
Figure 1 shows the main elements of the serial timekeeper: shift register, control logic, oscillator, real-time clock,
and RAM.
TYPICAL OPERATING CIRCUIT
VCC
CPU
X1 X2
CE VCC2
DS1302
I/O
SCLK
GND
VCC1
VCC
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Figure 1. Block Diagram
DS1302 Trickle-Charge Timekeeping Chip
TYPICAL OPERATING CHARACTERISTICS
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
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DS1302 Trickle-Charge Timekeeping Chip
PIN DESCRIPTION
PIN NAME
FUNCTION
Primary Power-Supply Pin in Dual Supply Configuration. VCC1 is connected to a
backup source to maintain the time and date in the absence of primary power. The
1 VCC2 DS1302 operates from the larger of VCC1 or VCC2. When VCC2 is greater than VCC1 +
0.2V, VCC2 powers the DS1302. When VCC2 is less than VCC1, VCC1 powers the
DS1302.
Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator is
2 X1 designed for operation with a crystal having a specified load capacitance of 6pF.
For more information on crystal selection and crystal layout considerations, refer to
Application Note 58: Crystal Considerations for Dallas Real-Time Clocks. The
DS1302 can also be driven by an external 32.768kHz oscillator. In this
3 X2 configuration, the X1 pin is connected to the external oscillator signal and the X2 pin
is floated.
4 GND Ground
Input. CE signal must be asserted high during a read or a write. This pin has an
5 CE internal 40k(typ) pulldown resistor to ground. Note: Previous data sheet revisions
referred to CE as RST. The functionality of the pin has not changed.
6
I/O
Input/Push-Pull Output. The I/O pin is the bidirectional data pin for the 3-wire
interface. This pin has an internal 40k(typ) pulldown resistor to ground.
7
SCLK
Input. SCLK is used to synchronize data movement on the serial interface. This pin
has an internal 40k(typ) pulldown resistor to ground.
Low-Power Operation in Single Supply and Battery-Operated Systems and Low-
Power Battery Backup. In systems using the trickle charger, the rechargeable
8 VCC1 energy source is connected to this pin. UL recognized to ensure against reverse
charging current when used with a lithium battery. Go to www.maxim-
ic.com/TechSupport/QA/ntrl.htm.
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