DS1602 datasheet, PDF - EEWORLD Datasheet

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DS1602: DescriptionReal Time Clock; Categorysemiconductor Analog mixed-signal IC; File Size183KB，8 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS1602 Overview

Real Time Clock

DS1602 Parametric

Parameter Name	Attribute value
Product Category	Real Time Clock
Manufacturer	Maxim
Mounting Style	Through Hole
Package / Case	PDIP Narrow
RTC Bus Interface	Serial
Time Format	Binary
Supply Voltage - Max	5.5 V
Supply Voltage - Min	4.5 V
Maximum Operating Temperature	+ 85 C
Minimum Operating Temperature	- 40 C
Function	Calendar, Clock, Elapsed Time Counter
Product	Real Time Clocks

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www.maxim-ic.com

DS1602

Elapsed Time Counter

PIN ASSIGNMENT

RST

CLK

GND

BAT

www.maxim-ic.com

FEATURES

Two 32-bit counters keep track of real-time

and elapsed time

Counters keep track of seconds for over 125

years

Battery powered counter counts seconds from

the time battery is attached until V

BAT

is less

than 2.5V

powered counter counts seconds while

is above V

and retains the count in the

absence of V

under battery backup power

Clear function resets selected counter to 0

Read/write serial port affords low pin count

Maximum current drain of less than 1 µA

from V

BAT

pin when serial port is disabled

One byte protocol defines read/write, counter

address and software clear function

8-pin DIP or optional 8-pin SOIC

Operating temperature range of -40°C to

+85°C

Reduced performance operation down to

= 2.5V

Underwriters Laboratory (UL) recognized

DS1602

8-Pin DIP (300mil)

RST

CLK

GND

BAT

DS1602

8-Pin SOIC (208mil)

Package Dimension Information

www.maxim-ic.com/TechSupport/DallasPackInfo.htm

PIN DESCRIPTION

RST

CLK

GND

X1, X2

BAT

- Reset

- Clock

- Data Input/Output

- Ground

- Crystal Inputs

- + Battery Input

- +5V

DESCRIPTION

The DS1602 is a real-time clock/elapsed time counter designed to count seconds when V power is

applied and continually count seconds under battery backup power with an additional counter regardless

of the condition of V

. The continuous counter can be used to derive time of day, week, month, and year

by using a software algorithm. The V powered counter will automatically record the amount of time

that V power is applied. This function is particularly useful in determining the operational time of

equipment in which the DS1602 is used. Alternatively, this counter can also be used under software

control to record real-time eve nts. Communication to and from the DS1602 takes place via a 3-wire serial

port. A 1-byte protocol selects read/ write functions, counter clear functions and oscillator trim. A low

cost 32.768kHz crystal attaches directly to the X1 and X2 pins. If battery powered-only operation is

desired, the V

BAT

pin must be grounded and the V

pin must be connected to the battery.

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.

1 of 10

093002

DS1602

OPERATION

The main elements of the DS1602 are shown in Figure 1. As shown, communications to and from the

elapsed time counter occur over a 3-wire serial port. The port is activated by driving

RST

to a high state.

With

RST

at high level, 8 bits are loaded into the protocol shift register providing read/write, register

select, register clear, and oscillator trim information. Each bit is serially input on the rising edge of the

clock input. After the first eight clock cycles have loaded the protocol register with a valid protocol,

additional clocks will output data for a read or input data for a write. V

must be present to access the

DS1602. If V < V

, the DS1602 goes into a battery backup mode which disables the serial port to

conserve battery capacity. For battery only operations, the V

BAT

pin must be grounded and the V

must be connected to the battery. This will keep the DS1602 out of battery backup mode. Battery

powered operation down to 2.5V is possible with reduced speed performance on the serial port. The 32-

bit continuous counter always runs provided that a valid supply is present and the oscillator is enabled.

The 32-bit V

active counter is gated by V

and the internal 1Hz signal.

PROTOCOL REGISTER

The protocol bit definition is shown in Figure 2. Valid protocols and the resulting actions are shown in

Table 1. Each data transfer to the protocol register designates what action is to occur. As defined, the

MSB (bit 7 which is designated ACC) selects the 32-bit continuous counter for access. If ACC is a logical

1 the continuous counter is selected and the 32 clock cycles that follow the protocol will either read or

write this counter. If the counter is being read, the contents will be latched into a different register at the

end of protocol and the latched contents will be read out on the next 32 clock cycles. This avoids reading

garbled data if the counter is clocked by the oscillator during a read. Similarly, if the counter is to be

written, the data is buffered in a register and all 32 bits are jammed into the counter simultaneously on the

rising edge of the 32

clock. The next bit (bit 6 which is designated AVC) selects the 32-bit V

active

counter for access. If AVC is a logical 1 this counter is selected and the 32 clock cycles that follow will

either read or write this counter. If both bit 7 and bit 6 are written to a logic high, all clock cycles beyond

the protocol are ignored and bits 5, 4, and 3 are loaded into the oscillator trim register. A value of binary 3

(011) will give a clock accuracy of ±120 seconds per month at +25°C. Increasing the binary number

towards 7 will cause the real- time clock to run faster. Conversely, lowering the binary number towards 0

will cause the clock to run slower. Binary 000 will stop the oscillator completely. This feature can be used

to conserve battery life during storage. In this mode the I

BAT

current is reduced to 100nA maximum. In

applications where oscillator trimming is not practical or not needed, a default setting of 011 is

recommended. Bit 2 of protocol (designated CCC) is used to clear the continuous counter. When set to

logic 1, the continuous counter will reset to 0 when

RST

is taken low. Bit 1 of protocol (designated CVC)

is used to clear the V

active counter. When set to logical 1, the V

active counter will reset to 0 when

RST

is taken low. Both counters can be reset simultaneously by setting CCC and CVC both to a logical

1. Bit 0 of the protocol (designated RD) determines whether the 32 clocks to follow will write a counter

or read a counter. When RD is set to a logical 0 a write action will follow when RD is set to a logical 1 a

read action will follow. When sending the protocol, 8 bits should always be sent. Sending less than 8 bits

can produce erroneous results. If clearing the counters or trimming the oscillator, the data transfer can be

terminated after the 8-bit protocol is sent. However, when reading or writing the counters, 32 clock cycles

should always follow the protocol.

RESET AND CLOCK CONTROL

All data transfers are initiated by driving the

RST

input high. The

RST

input has two functions. First,

RST

turns on the serial port logic, which allows access to the protocol register for the protocol data entry.

Second, the

RST

signal provides a method of terminating the protocol transfer or the 32-bit counter

2 of 8

DS1602

transfer. A clock cycle is a sequence of a rising edge followed by a falling edge. For write inputs, data

must be valid during the rising edge of the clock. Data bits are output on the falling edge of the clock

when data is being read. All data transfers terminate if the

RST

input is transitioned low and the DQ pin

goes to a high- impedance state.

RST

should only be transitioned low while the clock is high to avoid

disturbing the last bit of data. All data transfers must consist of 8 bits when transferring protocol only or

8 + 32 bits when reading or writing either counter. Data transfer is illustrated in Figure 3.

DATA INPUT

Following the 8-bit protocol that inputs write mode, 32 bits of data are written to the selected counter on

the rising edge of the next 32 CLK cycles. After 32 bits have been entered any additional CLK cycles will

be ignored until

RST

is transitioned low to end data transfer, and then high again to begin new data

transfer.

DATA OUTPUT

Following the eight CLK cycles that input read mode protocol, 32 bits of data will be output from the

selected counter on the next 32 CLK cycles. The first data bit to be transmitted from the selected 32-bit

counter occurs on the falling edge after the last bit of protocol is written. When transmitting data from the

selected 32-bit counter,

RST

must remain at high level as a transition to low level will terminate data

transfer. Data is driven out the DQ pin as long as CLK is low. When CLK is high the DQ pin is tristated.

CRYSTAL SELECTION

A standard 32.768kHz quartz crystal can be directly connected to the DS1602 via pins 1 and 2 (X1, X2).

The crystal selected for use should have a specified load capacitance (C

) of 6pF. For more information

on crystal selection and crystal layout considerations, please consult

Application Note 58: Crystal

Considerations with Dallas Real-Time Clocks.

BATTERY SELECTION

The battery selected for use with the DS1602 should have an output voltage between 2.5V and 3.5V. A

lithium battery of 35mAh or greater will run the elapsed time counter for over 10 years in the absence of

power. Small lithium coin cell batteries produce both the proper output voltage and have the capacity to

supply the DS1602 for the useable lifetime of the equipment where they are installed.

PIN DESCRIPTIONS

Vcc, GND –

DC power is provided to the device on these pins. V

is the +5V input. When 5V is applied

within normal limits, the device is fully accessible and data can be written and read. When a 3V battery is

connected to the device and V

is below 1.25 x V

BAT

, reads and writes are inhibited. As V

falls below

BAT

the continuous counter is switched over to the external power supply (nominal 3.0V DC) at V

BAT

CLK (Serial Clock Input) –

CLK is used to synchronize data movement on the serial interface.

DQ (Data Input/Output) –

The DQ pin is the bidirectional data pin for the 3-wire interface.

RST (Reset) –

The reset signal must be asserted high during a read or a write.

X1, X2 –

Connections for a 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 with

3 of 8

DS1602 Related Products

	DS1602	DS1602-	DS1602S-TRL
Description	Real Time Clock	Real Time Clock	Real Time Clock
Product Category	Real Time Clock	Real Time Clock	-
Manufacturer	Maxim	Maxim	-
Mounting Style	Through Hole	Through Hole	-
Package / Case	PDIP Narrow	PDIP Narrow	-
RTC Bus Interface	Serial	Serial	-
Time Format	Binary	Binary	-
Supply Voltage - Max	5.5 V	5.5 V	-
Supply Voltage - Min	4.5 V	4.5 V	-
Maximum Operating Temperature	+ 85 C	+ 85 C	-
Minimum Operating Temperature	- 40 C	- 40 C	-
Function	Calendar, Clock, Elapsed Time Counter	Calendar, Clock, Elapsed Time Counter	-
Product	Real Time Clocks	Real Time Clocks	-

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