Rainbow-electronics DS1393 Manual de usuario descargar pdf (Pagina 1)

General Description

The low-voltage serial-peripheral interface (SPI™)

DS1390/DS1391 and the low-voltage 3-wire DS1392/

DS1393 real-time clocks (RTCs) are clocks/calendars

that provide hundredths of a second, seconds, min-

utes, 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 an AM/PM indicator.

One programmable time-of-day alarm is provided. A

temperature-compensated voltage reference monitors

the status of V

and automatically switches to the

backup supply if a power failure is detected. On the

DS1390, a single open-drain output provides a CPU

interrupt or a square wave at one of four selectable fre-

quencies. The DS1391 replaces the SQW/INT pin with a

RST output/debounced input.

The DS1390 and DS1391 are programmed serially

through an SPI-compatible, bidirectional bus. The

DS1392 and DS1393 communicate over a 3-wire serial

bus, and the extra pin is used for either a separate

interrupt pin or a RST output/debounced input.

All four devices are available in a 10-pin µSOP package,

and are rated over the industrial temperature range.

Applications

Hand-Held Devices

GPS/Telematics Devices

Embedded Time Stamping

Medical Devices

Features

♦ Real-Time Clock Counts Hundredths of Seconds,

Seconds, Minutes, Hours, Day, Date, Month, and

Year with Leap-Year Compensation Valid Up to

2100

♦ Output Pin Configurable as Interrupt or Square

Wave with Programmable Frequency of

32.768kHz, 8.192kHz, 4.096kHz, or 1Hz

(DS1390/DS1393 Only)

♦ One Time-of-Day Alarm

♦ Power-Fail Detect and Switch Circuitry

♦ Reset Output/Debounced Input (DS1391/DS1393)

♦ Separate SQW and INT Output (DS1392)

♦ Trickle-Charge Capability

♦ SPI Supports Modes 1 and 3 (DS1390/DS1391)

♦ 3-Wire Interface (DS1392/DS1393)

♦ 4MHz at 3.0V and 3.3V

♦ 1MHz at 1.8V

♦ Three Operating Voltages: 1.8V ±5%, 3.0V ±10%,

and 2.97 to 5.5V

♦ Industrial Temperature Range: -40°C to +85°C

♦ Underwriters Laboratory (UL) Recognized

DS1390/DS1391/DS1392/DS1393

Low-Voltage SPI/3-Wire RTCs with

Trickle Charger

______________________________________________ Maxim Integrated Products 1

Ordering Information

Rev 0; 7/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Typical Operating Circuits and Pin Configurations appear at

end of the data sheet.

Where “rr” is a revision code on the second line of the top mark.

PART

TEMP RANGE

PIN-

PACKAGE

TOP MARK

DS1390U-18

-40°C to +85°C

10 µSOP

DS1390 rr-18

DS1390U-3

-40°C to +85°C

10 µSOP DS1390 rr-3

DS1390U-33

-40°C to +85°C

10 µSOP

DS1390 rr-33

DS1391U-18

-40°C to +85°C

10 µSOP

DS1391 rr-18

DS1391U-3

-40°C to +85°C

10 µSOP DS1391 rr-3

DS1391U-33

-40°C to +85°C

10 µSOP

DS1391 rr-33

DS1392U-18

-40°C to +85°C

10 µSOP

DS1393 rr-18

DS1392U-3

-40°C to +85°C

10 µSOP DS1392 rr-3

DS1392U-33

-40°C to +85°C

10 µSOP

DS1392 rr-33

DS1393U-18

-40°C to +85°C

10 µSOP

DS1393 rr-18

DS1393U-3

-40°C to +85°C

10 µSOP DS1393 rr-3

DS1393U-33

-40°C to +85°C

10 µSOP

DS1393 rr-33

SPI is a trademark of Motorola, Inc.

1 2 3 4 5 6 ... 23 24

Indice de contenidos

Pagina 1 - Trickle Charger

General DescriptionThe low-voltage serial-peripheral interface (SPI™)DS1390/DS1391 and the low-voltage 3-wire DS1392/DS1393 real-time clocks (RTCs) ar

Pagina 2

DS1390/DS1391/DS1392/DS1393Low-Voltage SPI/3-Wire RTCs withTrickle Charger10 ____________________________________________________________________Pin D

Pagina 3

Detailed DescriptionThe DS1390/DS1391/DS1392/DS1393 RTCs are low-power clocks/calendars with alarms. Address and dataare transferred serially through

Pagina 4

DS1390/DS1391/DS1392/DS1393However, when VCCfalls below VPF, the internal clockregisters are blocked from any access. If VPFis lessthan VBACKUP, the d

Pagina 5

Address MapTable 2 shows the address map for the DS1390–DS1393 RTC and RAM registers. The RTC registers arelocated in address locations 00h to 0Fh in

Pagina 6

DS1390/DS1391/DS1392/DS1393Hundredths-of-Seconds GeneratorThe hundredths-of-seconds generator circuit shown inthe functional diagram is a state machin

Pagina 7

The DY/DT bits (bit 6 of the alarm day/date registers)control whether the alarm value stored in bits 0 to 5 ofthat register reflects the day of the we

Pagina 8

DS1390/DS1391/DS1392/DS1393Bit 7: Enable Oscillator (EOSC). When set to logic 0,this bit starts the oscillator. When this bit is set to logic1, the os

Pagina 9

Bit 7: Oscillator Stop Flag (OSF). A logic 1 in this bitindicates that the oscillator has stopped or wasstopped for some time and may be used to judge

Pagina 10

DS1390/DS1391/DS1392/DS1393The user determines diode and resistor selectionaccording to the maximum current desired for batteryor super cap charging.

Pagina 11

SPI Serial-Data BusThe DS1390/DS1391 provide a 4-wire SPI serial-databus to communicate in systems with an SPI host con-troller. Both devices support

Pagina 12

DS1390/DS1391/DS1392/DS1393Low-Voltage SPI/3-Wire RTCs withTrickle Charger2 _____________________________________________________________________ABSOL

Pagina 13

DS1390/DS1391/DS1392/DS1393Low-Voltage SPI/3-Wire RTCs withTrickle Charger20 ____________________________________________________________________CSSCL

Pagina 14

3-Wire Serial-Data BusThe DS1392/DS1393 provide a 3-wire serial-data bus,and support both single-byte and multiple-byte datatransfers for maximum flex

Pagina 15

DS1390/DS1391/DS1392/DS1393Low-Voltage SPI/3-Wire RTCs withTrickle Charger22 ____________________________________________________________________X1TOP

Pagina 16

DS1390/DS1391/DS1392/DS1393Low-Voltage SPI/3-Wire RTCs withTrickle Charger____________________________________________________________________ 23DS139

Pagina 17

DS1390/DS1391/DS1392/DS1393Low-Voltage SPI/3-Wire RTCs withTrickle ChargerMaxim cannot assume responsibility for use of any circuitry other than circu

Pagina 18

DS1390/DS1391/DS1392/DS1393Low-Voltage SPI/3-Wire RTCs withTrickle Charger_____________________________________________________________________ 3RECOM

Pagina 19

DS1390/DS1391/DS1392/DS1393Low-Voltage SPI/3-Wire RTCs withTrickle Charger4 _____________________________________________________________________CSSCL

Pagina 20

DS1390/DS1391/DS1392/DS1393Low-Voltage SPI/3-Wire RTCs withTrickle Charger_____________________________________________________________________ 5AC EL

Pagina 21

DS1390/DS1391/DS1392/DS1393Low-Voltage SPI/3-Wire RTCs withTrickle Charger6 _____________________________________________________________________tDCtC

Pagina 22

DS1390/DS1391/DS1392/DS1393Low-Voltage SPI/3-Wire RTCs withTrickle Charger_____________________________________________________________________ 7OUTPU

Pagina 23

DS1390/DS1391/DS1392/DS1393Low-Voltage SPI/3-Wire RTCs withTrickle Charger8 _____________________________________________________________________CAPAC

Pagina 24

DS1390/DS1391/DS1392/DS1393Low-Voltage SPI/3-Wire RTCs withTrickle Charger_____________________________________________________________________ 9Typic

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