Rainbow-electronics DS1615 Manual do Utilizador descarregar pdf (Página 19)

DS1615

19 of 24

1. Write Byte (22h)

Host Transmit:

D7 D6 D5 D4 D3 D2 D1 D0

00100010

0 a6a5a4a3a2a1a0

d7 d6 d5 d4 d3 d2 d1 d0

DS1615 Response: None

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

the DS1615 is programmed to begin a new datalogging mission.

2. Read Page (33h)

Host Transmit:

D7 D6 D5 D4 D3 D2 D1 D0

00110011

a15 a14 a13 a12 a11 a10 a9 a8

a7 a6 a5 a4 a3 a2 a1 a0

DS1615 Response (Host Receives):

D7 D6 D5 D4 D3 D2 D1 D0

↓

Where xxx represents the last register of the page that has been accessed.

When in asynchronous mode, the TX pin becomes inactive after the last register in the page and the CRC

have been transmitted. In synchronous mode, the DS1615 will continue to transmit data as long as clocks

are presented to the serial interface. If clocks are presented after the final data bit of the last register in

the page, the DS1615 will wrap-around to the first register in the page and sequentially transmit data as

long as the clocks continue.

3. Specification Test (44h)

Host Transmit:

D7 D6 D5 D4 D3 D2 D1 D0

01000100

DS1615 Response (Host Receives): Either the INSPEC or OUTSPEC pin will generate four low pulses.

Each pulse will be 62.5 ms in duration and will start every half second.

This command instructs the DS1615 to generate four low pulses on either the

INSPEC or OUTSPEC LED

driver pins. The pin that is driven is dependent upon whether any data samples fell outside of the High

Temperature and Low Temperature Threshold boundaries. These pins, when used to drive LEDs, can be

used to provide a quick visual confirmation as to whether the temperature remained within the user-

defined limits.

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Rainbow-electronics DS1615 Manual do Utilizador Página 19