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51单片机驱动DS1339时钟芯片代码.zip （5个子文件）

51单片机驱动DS1339时钟芯片代码

DS1339硬件.doc 141KB

DS1339.doc 202KB

DS1339

ds1339.c 2KB

ds1339.h 151B

DS1339.pdf 397KB

1 of 20

REV: 100108

GENERAL DESCRIPTION

The DS1339 serial real-time clock (RTC) is a low-

power clock/date device with two programmable time-

of-day alarms and a programmable square-wave

output. Address and data are transferred serially

through an I

C bus. The clock/date provides seconds,

minutes, hours, day, date, month, and year

information. The date at the end of the month 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

AM/PM indicator. The DS1339 has a built-in power-

sense circuit that detects power failures and

automatically switches to the backup supply,

maintaining time, date, and alarm operation.

APPLICATIONS

Handhelds (GPS, POS Terminals)

Consumer Electronics (Set-Top Box, Digital

Recording, Network Appliance)

Office Equipment (Fax/Printers, Copier)

Medical (Glucometer, Medicine Dispenser)

Telecommunications (Routers, Switches, Servers)

Other (Utility Meter, Vending Machine, Thermostat,

Modem

)

FEATURES

 Real-Time Clock (RTC) Counts Seconds, Minutes,

Hours, Day, Date, Month, and Year with Leap-

Year Compensation Valid Up to 2100

 Available in a Surface-Mount Package with an

Integrated Crystal (DS1339C)

 I

C Serial Interface

 Two Time-of-Day Alarms

 Programmable Square-Wave Output

 Oscillator Stop Flag

 Automatic Power-Fail Detect and Switch Circuitry

 Trickle-Charge Capability

 Underwriters Laboratory (UL) Recognized

Pin Configurations appear at end of data sheet.

ORDERING INFORMATION

PART TEMP RANGE VOLTAGE (V) PIN-PACKAGE TOP MARK†

DS1339C-2# -40°C to +85°C 2.0 16 SO (300 mils) DS1339C-2

DS1339C-3# -40°C to +85°C 3.0 16 SO (300 mils) DS1339C-3

DS1339C-33# -40°C to +85°C 3.3 16 SO (300 mils) DS1339C-33

DS1339U-2+ -40°C to +85°C 2.0

8 μSOP

1339 rr-2

DS1339U-3+ -40°C to +85°C 3.0

8 μSOP

1339 rr-3

DS1339U-33+ -40°C to +85°C 3.3

8 μSOP

1339 rr-33

+ Denotes a lead-free/RoHS-compliant device.

# Denotes a RoHS-compliant device that may include lead that is exempt under the RoHS requirements. The lead finish is JESD97 category

e3, and is compatible with both lead-based and lead-free soldering processes.

† A “+” anywhere on the top mark indicates a lead-free device. A “#” denotes a RoHS-compliant device. rr = second line, revision code

DS1339

C Serial Real-Time Clock

www.maxim-ic.com

DS1339 I

C Serial Real-Time Clock

2 of 20

ABSOLUTE MAXIMUM RATINGS

Voltage Range on Any Pin Relative to Ground………………………………………………………………-0.3V to +6.0V

Operating Temperature Range (Noncondensing)………………………………………………………….-40°C to +85°C

Storage Temperature Range………………………………………………………………………………..-55°C to +125°C

Soldering Temperature Range………………..See precautions in the Handling, PCB Layout, and Assembly section.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,

and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is

not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability.

RECOMMENDED DC OPERATING CONDITIONS

= -40°C to +85°C) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DS1339-2 1.8 2.0 2.2

DS1339-3 2.7 3.0 3.3

Supply Voltage V

DS1339-33 2.97 3.3 5.5

Backup Supply Voltage V

BACKUP

1.3 3.0 3.7 V

Logic 1 V

0.7 x

0.3

Logic 0 V

-0.3

+0.3 x

DS1339-2 1.58 1.70 1.80

DS1339-3 2.45 2.59 2.70

Power-Fail Voltage V

DS1339-33 2.70 2.85 2.97

DC ELECTRICAL CHARACTERISTICS

= MIN to MAX, T

= -40°C to +85°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Leakage I

(Note 2) 1

μA

I/O Leakage I

(Note 3) 1

μA

Logic 0 Out

= 0.4V; V

> V

MIN (-3, -33);

≥ 2.0V (-2)

(Note 3) 3 mA

Logic 0 Out

= 0.2 (V

);

1.8V < V

< 2.0V (DS1339-2)

(Note 3) 3 mA

Logic 0 Out

= 0.2 (V

);

1.3V < V

< 1.8V (DS1339-2)

(Note 3) 250

μA

Active Current I

CCA

(Note 4) 450

μA

≤ 3.63V 80 150

Standby Current (Note 5) I

CCS

3.63V < V

≤ 5.5V 200

μA

DS1339 I

C Serial Real-Time Clock

3 of 20

DC ELECTRICAL CHARACTERISTICS (continued)

= MIN to MAX, T

= -40°C to +85°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Trickle-Charger Resistor Register

10h = A5h, V

= Typ, V

BACKUP

= 0V

R1 (Note 6) 250

Trickle-Charger Resistor Register

10h = A6h, V

= Typ, V

BACKUP

= 0V

R2 2000

Trickle-Charger Resistor Register

10h = A7h, V

= Typ, V

BACKUP

= 0V

R3 4000

BACKUP

Leakage Current I

BKLKG

25 100 nA

DC ELECTRICAL CHARACTERISTICS

= 0V, T

= -40°C to +85°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

BACKUP

Current EOSC = 0, SQW Off

BKOSC

(Note 7) 400 700 nA

BACKUP

Current EOSC = 0, SQW On

BKSQW

(Note 7) 600 1000 nA

BACKUP

Current EOSC = 1

BKDR

10 100 nA

DS1339 I

C Serial Real-Time Clock

4 of 20

AC ELECTRICAL CHARACTERISTICS

= MIN to MAX, T

= -40°C to +85°C.) (Note 13)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS

Fast mode 100 400

SCL Clock Frequency f

SCL

Standard mode 100

kHz

Fast mode 1.3

Bus Free Time Between a STOP

and START Condition

BUF

Standard mode 4.7

μs

Fast mode 0.6

Hold Time (Repeated) START

Condition (Note 8)

HD:STA

Standard mode 4.0

μs

Fast mode 1.3

LOW Period of SCL Clock t

LOW

Standard mode 4.7

μs

Fast mode 0.6

HIGH Period of SCL Clock t

HIGH

Standard mode 4.0

μs

Fast mode 0.6

Setup Time for a Repeated

START Condition

SU:STA

Standard mode 4.7

μs

Fast mode 0 0.9

Data Hold Time (Notes 9, 10) t

HD:DAT

Standard mode 0

μs

Fast mode 100

Data Setup Time (Note 11) t

SU:DAT

Standard mode 250

Fast mode 20 + 0.1C

300

Rise Time of Both SDA and SCL

Signals (Note 12)

Standard mode 20 + 0.1C

1000

Fast mode 20 + 0.1C

300

Fall Time of Both SDA and SCL

Signals (Note 12)

Standard mode 20 + 0.1C

300

Fast mode 0.6

Setup Time for STOP Condition t

SU:STO

Standard mode 4.0

μs

Capacitive Load for Each Bus

Line (Note 12)

400 pF

I/O Capacitance (SDA, SCL) C

I/O

(Note 13) 10 pF

Oscillator Stop Flag (OSF) Delay t

OSF

(Note 14) 100 ms

DS1339 I

C Serial Real-Time Clock

5 of 20

POWER-UP/DOWN CHARACTERISTICS

= -40°C to +85°C) (Note 1, Figure 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Recovery at Power-Up t

REC

(Note 15) 2 ms

Fall Time; V

PF(MAX)

to V

PF(MIN)

VCCF

300

μs

Rise Time; V

PF(MIN)

to V

PF(MAX)

VCCR

μs

WARNING: Under no circumstances are negative undershoots, of any amplitude, allowed when device is in

battery-backup mode.

Note 1: Limits at -40°C are guaranteed by design and are not production tested.

Note 2: SCL only.

Note 3:

SDA and SQW/INT.

Note 4: I

CCA

—SCL at f

max, V

= 0.0V, V

= V

, trickle charger disabled.

Note 5: Specified with the I

C bus inactive, V

= 0.0V, V

= V

, trickle charger disabled.

Note 6:

must be less than 3.63V if the 250Ω resistor is selected.

Note 7: Using recommended crystal on X1 and X2.

Note 8: After this period, the first clock pulse is generated.

Note 9:

A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the V

IHMIN

of the SCL signal) to bridge

the undefined region of the falling edge of SCL.

Note 10: The maximum t

HD:DAT

need only be met if the device does not stretch the LOW period (t

LOW

) of the SCL signal.

Note 11:

A fast-mode device can be used in a standard-mode system, but the requirement t

SU:DAT

≥ to 250ns must then be met. This is

automatically the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW

period of the SCL signal, it must output the next data bit to the SDA line t

R(MAX)

SU:DAT

= 1000 + 250 = 1250ns before the SCL line

is released.

Note 12: C

—total capacitance of one bus line in pF.

Note 13: Guaranteed by design. Not production tested.

Note 14:

The parameter t

OSF

is the period of time the oscillator must be stopped for the OSF flag to be set over the voltage range of 0.0V ≤

≤ V

CCMAX

and 1.3V ≤ V

BACKUP

≤ 3.7V.

Note 15: This delay applies only if the oscillator is running. If the oscillator is disabled or stopped, no power-up delay occurs.

Figure 1. Power-Up/Down Timing

OUTPUTS

PF(MAX)

PF(MIN)

INPUTS

HIGH-Z

DON'T CARE

VALID

RECOGNIZED

VALID

VCCF

VCCR

REC

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ushyun

2018-02-28

值得好好学习

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