DS1616 datasheet(3/29 Pages) DALLAS

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DS1616

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DS1616 Block Diagram Figure 1

SIGNAL DESCRIPTIONS

The following paragraphs describe the function of each pin.

VCC - VCC is a +5 volt input supply. Communication with the DS1616 can take place only when VCC is

connected to a +5 volt supply.

Vbat - Battery input for standard lithium cell or other energy source. All functions of the DS1616 with the

exception of the serial interface circuitry are powered by Vbat when VCC < Vbat. All functions are

connected directly to GND.

GND - GND connections are not internally connected, so all GND connections must be connected

directly to ground.

AGND - Analog ground should be connected directly to digital ground externally to eliminate ground

noise and potential differences.

COMSEL (Communication Select Input) - This pin determines whether serial communication is

asynchronous or synchronous. When pulled high to VCC, communication is synchronous and will take

place via the SCLK, I/O, and RST pins. When COMSEL is tied to ground, asynchronous communication

utilizing the TX and RX pins is selected. If this pin is floated, the DS1616 will operate in the

asynchronous communications mode since the COMSEL pin has a weak internal pulldown resistor.

OSCILLATOR

AND

DIVIDER

A/D

CONVERTER

CONTROL

LOGIC

DATALOG MEMORY

HISTOGRAM MEMORY

ALARM TIME STAMP

AND DURATION

LOGGING MEMORY

USER NVRAM

RTC AND CONTROL

REGISTERS

INTERNAL RTC

AND CONTROL

REGISTERS

SERIAL

INTERFACE

MEMORY

FUNCTION

CONTROL

INSPEC

OUTSPEC

INT

COMSEL

I/O

RST

SCLK

OPTIONAL

SERIAL NUMBER

AIN

TEMPERATURE

SENSOR

3 TO 1

MUX

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