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080299

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

than 2.5 volts

§ V

power

§ Clear function resets selected counter to 0

§ Read/Write serial port affords low pin count

§ Powered internally by a lithium energy cell

that provides over 10 years of operation

§ 1-byte protocol defines read/write, counter

address and software clear function

§ Self-contained crystal provides an accuracy of

±2 min per month

§ Operating temperature range of 0°C to 70°C

§ Low profile SIP module

PIN ASSIGNMENT

PIN DESCRIPTION

RST

- Reset

CLK

- Clock

DQ

- Data Input/Output

GND

- Ground

- +5 Volts

OSC

- 1 Hz Oscillator Output

NC

- No Connect

DESCRIPTION

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

equipment in which the DS1603 is used. Alternatively, this counter can also be used under software

control to record real time events. Communication to and from the DS1603 takes place via a 3–wire

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

device contains a 32.768 kHz crystal which will keep track of time to within

±2 min/mo. An internal

lithium energy source contains enough energy to power the continuous seconds counter for over 10 years.

OPERATION

The main elements of the DS1603 are shown in Figure 1. As shown, communications to and from the

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

DS1603

Elapsed Time Counter Module

www.dalsemi.com

1

2

3

4

5

6

7

RST

DQ

NC

CLK

OSC

GND