DS2404B datasheet, PDF - EEWORLD Datasheet

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DS2404B: DescriptionReal Time Clock; CategoryThe embedded processor and controller Microcontrollers and processors; File Size1MB，29 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS2404B Overview

Real Time Clock

DS2404B Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	Maxim
Parts packaging code	SOIC
package instruction	0.208 INCH, SSOP-16
Contacts	16
Reach Compliance Code	not_compliant
ECCN code	EAR99
Other features	1 HZ FIXED O/P; 64-BIT LASERED ROM; TIMEKEEPING CURRENT = 350NA
maximum clock frequency	0.032 MHz
Information access methods	SERIAL, 3-WIRE
JESD-30 code	R-PDSO-G16
JESD-609 code	e0
length	6.2 mm
Humidity sensitivity level	1
Number of terminals	16
Number of timers
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	SSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	240
Certification status	Not Qualified
Maximum seat height	1.99 mm
Maximum supply voltage	5.5 V
Minimum supply voltage	4.5 V
Nominal supply voltage	5 V
surface mount	YES
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	0.65 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	20
width	5.29 mm
uPs/uCs/peripheral integrated circuit type	TIMER, REAL TIME CLOCK

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DS2404

EconoRAM Time Chip

www.maxim-ic.com

FEATURES

4096 bits of nonvolatile dual-port memory

including real time clock/calendar in binary

format, programmable interval timer, and

programmable power-on cycle counter

1-Wire

interface for MicroLAN

communication at 16.3kbits/s

3-wire host interface for high-speed data

communications at 2Mb/s

Unique, factory-lasered and tested 64-bit

registration number (8-bit family code +

48-bit serial number + 8-bit CRC tester)

assures absolute traceability because no two

parts are alike

Memory partitioned into 16 pages of 256-bits

for packetizing data

256-bit scratchpad with strict read/write

protocols ensures integrity of data transfer

Programmable alarms can be set to generate

interrupts for interval timer, real time clock,

and/or cycle counter

16-pin DIP, SO, and SSOP packages

Operating temperature range from -40°C to

+85°C

Operating voltage range from 2.8V to 5.5V

PIN ASSIGNMENT

VCC

IRQ

RST

VCC

GND

1HZ

VBATO

VBATB

I/O

CLK

GND

16-PIN DIP (300 MIL)

16-PIN SO (300 MIL)

16-PIN SSOP (208 MIL)

See Mechanical Drawings Section

PIN DESCRIPTION

IRQ

RST

I/O

CLK

GND

BATB

BATO

1Hz

, X2

–

2.8 to 5.5V

Interrupt Output

3-Wire Reset Input

3-Wire Input/Output

1-Wire Input/Output

3-Wire Clock Input

No Connection

Ground

Battery Backup Input

Battery Operate Input

1Hz Output

Crystal Connections

ORDERING INFORMATION

DS2404-001

16-pin DIP

DS2404S-001

16-pin SO

DS2404B

16-pin SSOP

DS2404S-001/T&R Tape and Reel of S2404S-001

DS2404B/T&R

Tape and Reel of DS2404B

DESCRIPTION

The DS2404 EconoRAM Time Chip offers a simple solution for storing and retrieving vital data and time

information with minimal hardware. The DS2404 contains a unique lasered ROM, real-time

clock/calendar, interval timer, cycle counter, programmable interrupts, and 4096-bits of SRAM. Two

separate ports are provided for communication: 1-Wire and 3-wire. Using the 1-Wire port, only one pin is

required for communication, and the lasered-ROM can be read even when the DS2404 is without power.

The 3-wire port provides high-speed communication using the traditional Dallas Semiconductor 3-wire

interface. With either interface, a strict protocol for accessing the DS2404 ensures data integrity. Utilizing

backup energy sources, the data is nonvolatile (NV) and allows for stand-alone operation.

1-Wire is a registered trademark of Dallas Semiconductor.

1 of 29

012207

DS2404

Port selection is accomplished on a first-come, first-serve basis. Whichever port comes out of reset first

will obtain control. For the 3-wire port, this is done by bringing

RST

high. For the 1-Wire port, this is

done on the first falling edge of I/O after the reset and presence pulses. (See “1-Wire Signaling” section.)

More information on how to arbitrate port access is found in section “Device Operation Modes” later in

this document.

PARASITE POWER

The block diagram (Figure 1) shows the parasite-powered circuitry. This circuitry “steals” power

whenever the I/O,

RST

, or V

pins are high. When using the 1-Wire port in battery operate mode,

RST

and V

provide no power since they are low. However, I/O will provide sufficient power as long as

the specified timing and voltage requirements are met. The advantages of parasite power are two-fold:

1) by parasiting off these pins, battery power is conserved and 2) the ROM may be read in absence of

normal power. For instance, in battery-operate mode, if the battery fails, the ROM may still be read

normally.

In battery-backed mode, if V

fails, the port switches in the battery but inhibits communication. The

ROM may still be read normally over the 1-Wire port if

RST

is low.

64-BIT LASERED ROM

Each DS2404 contains a unique ROM code that is 64 bits long. The first eight bits are a 1-Wire family

code (DS2404 code is 04h). The next 48 bits are a unique serial number. The last eight bits are a CRC of

the first 56 bits. (See Figure 2.)

The 1-Wire CRC is generated using a polynomial generator consisting of a shift register and XOR gates

as shown in Figure 3. The polynomial is X

+ X

+ 1. Additional information about the Dallas

1-Wire Cyclic Redundancy Check is available in Application Note 27, “Understanding and Using Cyclic

Redundancy Checks with Dallas Semiconductor iButton Products”.

The shift register bits are initialized to zero. Then starting with the least significant bit of the family code,

one bit at a time is shifted in. After the 8th bit of the family code has been entered, then the serial number

is entered. After the 48th bit of the serial number has been entered, the shift register contains the CRC

value. Shifting in the eight bits of CRC should return the shift register to all zeros.

64-BIT LASERED ROM

Figure 2

CRC

8 BITS

MSB

SERIAL NUMBER

48-BIT UNQUE NUMBER

DS2404 FAMILY CODE

04h

LSB

1-WIRE CRC CODE

Figure 3

4 of 29

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