TMP400 datasheet(12/27 Pages) TI2

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MINIMUM AND MAXIMUM REGISTERS

SOFTWARE RESET

TMP400

SBOS404 – DECEMBER 2007

The

n-correction

value

must

stored

The Local Temperature Maximum Register may be

two’s-complement format, yielding an effective data

read by reading the high byte from pointer address

range from –128 to +127. The n-correction value may

32h and the low byte from pointer address 33h. The

be written to and read from pointer address 18h. The

Local Temperature Maximum Register may also be

read by using a two-byte read command from pointer

address 32h. The Local Temperature Maximum

range is shown in Table 7.

reset command, or by writing any value to any of

Table 7. N-Factor Range

pointer addresses 30h through 37h. The reset value

for these registers is 80h/00h.

NADJUST

The Remote Temperature Minimum Register may be

BINARY

HEX

DECIMAL

read by reading the high byte from pointer address

01111111

127

1.747977

34h and the low byte from pointer address 35h. The

00001010

1.042759

Remote Temperature Minimum Register may also be

00001000

1.035616

read by using a two-byte read command from pointer

00000110

1.028571

address 34h. The Remote Temperature Minimum

00000100

1.021622

reset command, or by writing any value to any of

00000010

1.014765

pointer addresses 30h through 37h. The reset value

00000001

1.011371

for these registers is 7Fh/F0h.

00000000

1.008

The Remote Temperature Maximum Register may be

11111111

–1

1.004651

read by reading the high byte from pointer address

11111110

–2

1.001325

36h and the low byte from pointer address 37h. The

11111100

–4

0.994737

Remote Temperature Maximum Register may also be

11111010

–6

0.988235

read by using a two-byte read command from pointer

address 36h. The Remote Temperature Maximum

11111000

–8

0.981818

11110110

–10

0.975484

reset command, or by writing any value to any of

10000000

–128

0.706542

pointer addresses 30h through 37h. The reset value

for these registers is 80h/00h.

The TMP400 stores the minimum and maximum

temperatures measured since power-on, chip-reset,

The TMP400 may be reset by writing any value to

or minimum and maximum register reset for both the

Pointer Register FCh. A reset restores the power-on

local and remote channels. The Local Temperature

reset state to all of the TMP400 registers as well as

Minimum Register may be read by reading the high

aborts any conversion in process and clears the

byte from pointer address 30h and the low byte from

ALERT pin.

pointer

address

31h.

The

Local

Temperature

The TMP400 also supports reset via the Two-Wire

Minimum Register may also be read by using a

general

call

address

(00000000).

The

TMP400

two-byte read command from pointer address 30h.

acknowledges the general call address and responds

The Local Temperature Minimum Register is reset at

to the second byte. If the second byte is 00000110,

power-on, by executing the chip-reset command, or

the TMP400 latches the status of the address pins

by writing any value to any of pointer addresses 30h

and executes a software reset. A 500

µs time delay

through 37h. The reset value for these registers is

must be observed after a general-call command. The

7Fh/F0h.

TMP400 takes no action in response to other values

in the second byte.

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