MAX31826MUA+T【PDF 20/22 页】IC TEMP SENSOR DIGITAL 8UMAX

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Sheet目录42

16页 17页 18页 19页 [20页]21页 22页

 Maxim Integrated Products 20

MAX31826

1-Wire Digital Temperature Sensor

with 1Kb Lockable EEPROM

Operation Example

Table 3 shows an operation example in which there

are multiple devices on the bus using parasite power.

The bus master initiates a temperature conversion in a

specific MAX31826 and then reads Scratchpad 1 and

recalculates the CRC to verify the data.

Figure 13. Recommended Master Read-One Timing

Table 3. Operation Example

MASTER

MODE

DATA (LSB FIRST)

COMMENTS

Reset

Master issues reset pulse.

Presence

Devices respond with presence pulse.

F0h

Master issues Search ROM command

Reset

Master issues reset pulse.

Presence

Devices respond with presence pulse.

55h

Master issues Match ROM command for desired address

64-bit ROM code

Master sends device ROM code.

44h

Master issues Convert T command.

DQ line held high by

strong pullup

Master applies strong pullup to DQ for the duration of the conversion (t

CONV

Reset

Master issues reset pulse.

Presence

Devices respond with presence pulse.

55h

Master issues Match ROM command.

64-bit ROM code

Master sends device ROM code.

BEh

Master issues Read Scratchpad 1 command.

9 data bytes

Master reads entire Scratchpad 1 including CRC. The master then recalculates the CRC of

the first 8 data bytes from the scratchpad and compares the calculated CRC with the read

CRC (byte 9). If they match, the master continues; if not, the read operation is repeated.

OF MASTER

INIT

SMALL

MASTER SAMPLES

15祍

1-Wire BUS

GND

BUS MASTER PULLING LOW

RESISTOR PULLUP

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