MAX31725(2012) データシートの表示（PDF） - Maxim Integrated

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MAX31725
(Rev.:2012)

±0.5°C Local Temperature Sensor

Maxim Integrated 

MAX31725

±0.5°C Local Temperature Sensor

Internal Registers

The device contains four registers, each of which consists

of 2 bytes. The configuration register contains only 1

byte of actual data and, when read as a 2-byte register,

repeats the same data for the second byte. During a

2-byte write to the configuration register the second

byte written takes precedence. The device’s pointer

register selects between the four data registers shown

in Table 2. During reads and writes the pointer register

auto increments after every 2 data bytes, but does not

wrap from address 03h-00h. The pointer register must

be written for each I2C transaction. All registers are read

and write, except for the read-only temperature register.

Write to the configuration register by writing the slave

address byte, the pointer register byte to value 01h, and

a data byte. The TOS and THYST registers require the

slave address byte, pointer register byte, and 2 data

bytes. If only 1 data byte is written, it is saved in bits

D[15:8] of the respective register. If more than 2 data

bytes are written, the pointer register auto increments

and if pointing to a valid address, additional data writes

to the next address. See Figure 3.

Table 2. Register Functions and POR State

REGISTER

NAME

Temperature

Configuration

THYST

TOS

ADDRESS

(Hex)

00

01

02

03

Hex

0000h

00h

4B00h

5000h

POR STATE

BINARY

0000 0000 0000 0000

0000 0000

0100 1011 0000 0000

0101 0000 0000 0000

POR STATE

(°C)

0

—

75

80

READ/

WRITE

Read-only

R/W

R/W

R/W

1

91

91

9

1 0 D5* D4* D3* D2* D1* R/W

0 0 0 0 0 0 D1 D0

D7 D6 D5 D4 D3 D2 D1 D0

STOP

COND BY

MASTER

START

BY

MASTER

ADDRESS

BYTE

ACK BY

MAX31725

POINTER

BYTE

ACK BY

MAX31725

CONFIGURATION

BYTE

ACK BY

MAX31725

(a) CONFIGURATION REGISTER WRITE.

1

91

91

91

9

1 0 D5* D4* D3* D2* D1* R/W

0 0 0 0 0 0 D1 D0

D7 D6 D5 D4 D3 D2 D1 D0

D7 D6 D5 D4 D3 D2 D1 D0

STOP

COND BY

START

MASTER

BY

MASTER

ADDRESS

BYTE

ACK BY

MAX31725

POINTER

BYTE

ACK BY

MAX31725

MOST SIGNIFICANT

DATA BYTE

ACK BY

MAX31725

LEAST SIGNIFICANT

DATA BYTE

ACK BY

MAX31725

*SEE TABLE 1.

(b) TOS AND THYST WRITE.

Figure 3. I2C-Compatible Timing Diagram (Write)

Maxim Integrated

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