DS28EA00U+T&R【PDF 27/29 页】IC THERMOMETER 1-WIRE 8-USOP

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Sheet目录40

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1-Wire Communication Examples

1-Wire Digital Thermometer with

Sequence Detect and PIO

DS28EA00

Maxim Integrated

RST

WSP

Write Scratchpad

RST PD

SELECT

<3 Bytes>

<8 Bytes>

FF Loop

RST

RSP

RPM

CRC

Read Scratchpad

SELECT

RST

Convert Temperature (Parasite Powered)

SELECT

FF Loop

RST

Convert Temperature (Local V

Powered)

SELECT

FF Loop

During the wait, the master should activate a low-impedance

bypass to the 1-Wire pullup resistor.

During the wait, the master should activate a low-impedance

bypass to the 1-Wire pullup resistor.

See the command description for behavior if the device is in chain

ON or chain DONE state.

RST

Copy Scratchpad (Parasite Powered)

CPS

SELECT

Wait t

PROGMAX

FF Loop

Wait t

CONVMAX

FF Loop

The master reads 00h bytes until the write cycle is completed.

RST

Copy Scratchpad (Local V

Powered)

CPS <00h>

<00h>

RPM

<FFh>

<AAh>

SELECT

RST

PIO Access Write (Success)

SELECT

The master reads 00h bytes until the conversion is completed.

CTEMP

FF Loop

RST

Recall EEPROM

SELECT

<00h>

The master reads 00h bytes until the recall is completed.

Continues until master sends reset pulse.

Loop until master sends reset pulse.

RCLE

PIOW

PIOR

RST

Read Power Mode (Parasite Powered)

SELECT

RST

PIO Access Read

SELECT

RST

Read Power Mode (Local V

Powered)

SELECT

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