DS1616

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Communication Reset (Asynchronous Mode)

When transmitting the command, parameters, or data to the DS1616, it is possible that communication

might be interrupted. For example, the user might accidentally disconnect the cable linking the device to

the host computer.

To insure that communication always starts at a known state when in the

asynchronous mode, the DS1616 will reset the communication if it senses a problem.

This is

accomplished via two methods. First, if during the transmission of a byte of data to the DS1616, the stop

bit is not received, communication will be reset. The lack of a valid stop bit indicates that that particular

byte of data was not received correctly. Second, if more then 10-bit times expire between the reception of

1 byte of data and the reception of the next required byte, then communication will be reset.

Automatic resetting of communication is not required when communicating in the synchronous mode.

DS1616.

DS1616 COMMANDS

All communication with the DS1616 is accomplished by writing a command to the device followed by

parameter byte/s if required. Table 3 illustrates the commands supported by the DS1616.

The DS1616 commands are summarized below. Note that if an invalid command is issued, no action is

taken by the device.

DS1616 COMMANDS Table 3

COMMAND

FUNCTION

DESCRIPTION

22h

Write Byte

Write 1 byte to RTC, Control registers, and User NV RAM

33h

Read Page

Read Page

44h

Specification Test

Poll status of temperature and/or ADC Data extremes

55h

Read Data

Instructs DS1616 to immediately measure the temperature (if

CS0 = 1) and/or perform an analog to digital conversion on the

ADC Channels Selected (if CS[1-3] = 1) and store the result in

the Current Temperature and/or Current ADC Channel [1-3]

register(s) when MIP = 0.

A5h

Clear Memory

This command clears the datalog, histogram, Temperature

Alarm, ADC Channel 1 Alarm, Current Samples, Start Time

Stamp, Start Delay, and Sample Rate registers when the Clear

Enable bit (CLR) in the Control 1 register is set to a 1.

1. Write Byte (22h)

Host Transmit:

D7

D6

D5

D4

D3

D2

D1

D0

00

10

00

10

0

a6a5

a4a3

a2a1

a0

d7

d6

d5

d4

d3

d2

d1

d0

DS1616 Response: None

Note that good programming practice insists that the Clear Memory command should be issued whenever

the DS1616 is programmed to begin a new datalogging mission.