AVR单片机SPI程序DS1302资源-CSDN文库

共11个文件

pdf：5个

c：3个

h：2个

ATmega

SPI

DS1302

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SPI范例(DS1302).rar （11个子文件）

SPI使用范例_DS1302

main.h 1KB

main.c 6KB

DS1302.c 4KB

crystal.pdf 165KB

trickle.pdf 115KB

DS1302_old.pdf 217KB

design.pdf 53KB

USART.c 2KB

DS1302.pdf 230KB

Makefile 14KB

DS1302.h 1KB

1 of 13

REV: 082205

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata

FEATURES

§ 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

§ 31 x 8 RAM for Scratchpad Data Storage

§ Serial I/O for Minimum Pin Count

§ 2.0V to 5.5V Full Operation

§ Uses Less than 300nA at 2.0V

§ Single-Byte or Multiple-Byte (Burst Mode) Data

Transfer for Read or Write of Clock or RAM

Data

§ 8-Pin DIP or Optional 8-Pin SO for Surface

Mount

§ Simple 3-Wire Interface

§ TTL-Compatible (V

= 5V)

§ Optional Industrial Temperature Range:

-40°C to +85°C

§ DS1202 Compatible

§ Underwriters Laboratory (UL) Recognized

PIN CONFIGURATIONS

ORDERING INFORMATION

PART TEMP RANGE PIN-PACKAGE TOP MARK*

DS1302 0°C to +70°C 8 PDIP DS1302

DS1302+ 0°C to +70°C 8 PDIP DS1302

DS1302N -40°C to +85°C 8 PDIP DS1302

DS1302N+ -40°C to +85°C 8 PDIP DS1302

DS1302S 0°C to +70°C 8 SO (200 mils) DS1302S

DS1302S+ 0°C to +70°C 8 SO (200 mils) DS1302S

DS1302SN -40°C to +85°C 8 SO DS1302S

DS1302SN+ -40°C to +85°C 8 SO DS1302S

DS1302Z 0°C to +70°C 8 SO (150 mils) DS1302Z

DS1302Z+ 0°C to +70°C 8 SO (150 mils) DS1302Z

DS1302ZN -40°C to +85°C 8 SO DS1302ZN

DS1302ZN+ -40°C to +85°C 8 SO DS1302ZN

DS1302S-16 0°C to +70°C 16 SO (300 mils) DS1302S16

DS1302SN-16 -40°C to +85°C 16 SO (300 mils) DS1302SN16

+ = lead-free device.

*An N in the lower right-hand corner of the top mark indicates an industrial

temperature grade device. A + anywhere on the top mark indicates a

lead-free device.

DS1302

Trickle-Charge Timekeeping Chip

www.maxim-ic.com

CC1

SCLK

I/O

CC2

GND

DIP (300 mils)

DS1302

CC2

GND

CC1

SCLK

I/O

SO (200 mils/150 mils)

DS1302S/Z

CC2

GND

I/O

N.C.

SO (300 mils)

CC1

N.C.

SCLK

N.C.

N.C

N.C.

DS1302S

TOP VIEW

DS1302 Trickle-Charge Timekeeping Chip

2 of 13

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 1mW.

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 V

CC1

, 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

Figure 1. Block Diagram

POWER

CONTROL

CC1

CC 2

GND

INPUT

SHIFT

REGISTERS

I/O

SCLK

COMMAND AND

CONTROL LOGIC

REAL-TIME

CLOCK

31 x 8 RAM

OSCILLATOR

COUNTDOWN

CHAIN

X1 X2

1Hz

DS1302

CPU

CC2

SCLK

GND

X2 X1

I/O

CC1

DS1302 Trickle-Charge Timekeeping Chip

3 of 13

TYPICAL OPERATING CHARACTERISTICS

= 3.3V, T

= +25°C, unless otherwise noted.)

PIN DESCRIPTION

8 16

NAME FUNCTION

1 1 V

CC2

Primary Power-Supply Pin in Dual Supply Configuration. V

CC1

is connected to a

backup source to maintain the time and date in the absence of primary power. The

DS1302 operates from the larger of V

CC1

or V

CC2

. When V

CC2

is greater than V

CC1

0.2V, V

CC2

powers the DS1302. When V

CC2

is less than V

CC1

, V

CC1

powers the

DS1302.

2 3 X1

3 5 X2

Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator is

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

configuration, the X1 pin is connected to the external oscillator signal and the X2 pin

is floated.

4 8 GND Ground

5 9 CE

Input. CE signal must be asserted high during a read or a write. This pin has an

internal 40kW (typ) pulldown resistor to ground. Note: Previous data sheet revisions

referred to CE as

RST. The functionality of the pin has not changed.

6 12 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 40kW (typ) pulldown resistor to ground.

7 14 SCLK

Input. SCLK is used to synchronize data movement on the serial interface. This pin

has an internal 40kW (typ) pulldown resistor to ground.

8 16 V

CC1

Low-Power Operation in Single Supply and Battery-Operated Systems and Low-

Power Battery Backup. In systems using the trickle charger, the rechargeable

energy source is connected to this pin. UL recognized to ensure against reverse

charging current when used with a lithium battery.

—

2, 4, 6,

7, 10,

11, 13,

N.C. No Connection

CC2T

vs. V

CC2T

2.0 3.0 4.0 5.0

CC2

(V)

SUPPLY CURRENT (uA

)

CC1T

vs. V

CC1T

100

150

200

250

300

350

400

2.0 3.0 4.0 5.0

CC1

(V)

SUPPLY CURRENT (nA

)

DS1302 Trickle-Charge Timekeeping Chip

4 of 13

OSCILLATOR CIRCUIT

The DS1302 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. Figure 2 shows a

functional schematic of the oscillator circuit. If using a crystal with the specified characteristics, the startup time is

usually less than one second.

CLOCK ACCURACY

The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the match between

the capacitive load of the oscillator circuit and the capacitive load for which the crystal was trimmed. Additional

error will be added by crystal frequency drift caused by temperature shifts. External circuit noise coupled into the

oscillator circuit may result in the clock running fast. Figure 3 shows a typical PC board layout for isolating the

crystal and oscillator from noise. Refer to Application Note 58: Crystal Considerations for Dallas Real-Time Clocks

for detailed information.

Table 1. Crystal Specifications*

PARAMETER SYMBOL MIN TYP MAX UNITS

Nominal Frequency f

32.768 kHz

Series Resistance ESR 45

Load Capacitance C

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.

Figure 2. Oscillator Circuit Showing Internal Bias Network

Figure 3. Typical PC Board Layout for Crystal

COUNTDOWN

CHAIN

RTC

CRYSTAL

1 C

RTC

REGISTERS

LOCAL GROUND PLANE (LAYER 2)

CRYSTAL

GND

NOTE:

VOID ROUTING SIGNALS IN THE

CROSSHATCHED AREA (UPPER LEFT-

HAND QUADRANT) OF THE PACKAGE

UNLESS THERE IS A GROUND PLANE

BETWEEN THE SIGNAL LINE AND THE

PACKAGE.

评论收藏

内容反馈

zx1880

2013-08-28

太好了，用AVR自带SPI写的，要的就是它！多谢了！
wxg678

2012-07-22

太好了，极品啊，用AVR自带SPI写的，要的就是它！多谢了！
ww23tllw

2015-06-09

比相关书籍介绍的详细,顶一个
qq532389732

2014-08-28

还可以但是也不具体
q260186221

2012-08-30

可以、值得下载的资源

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