DS1616

3 of 29

DS1616 Block Diagram Figure 1

SIGNAL DESCRIPTIONS

The following paragraphs describe the function of each pin.

connected to a +5 volt supply.

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

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

X1

X2

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

Tx

Rx

ST

INSPEC

OUTSPEC

INT

COMSEL

I/O

RST

SCLK

OPTIONAL

SERIAL NUMBER

AIN

TEMPERATURE

SENSOR

3 TO 1

MUX