TMP512 datasheet(14/62 Pages) TI2

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TMP512

TMP513

SBOS491A

– JUNE 2010 – REVISED MAY 2011

www.ti.com

SERIES RESISTANCE CANCELLATION

Local Temperature Result Register and the Remote

Temperature Result Registers. Note that byte 1 is the

Series resistance in an application circuit that typically

most significant byte, followed by byte 2, the least

results

from

printed

circuit

board

(PCB)

trace

significant byte. The first 13 bits are used to indicate

resistance and remote line length is automatically

temperature. The least significant byte does not have

cancelled by the TMP512/13, preventing what would

to be read if that information is not needed. The data

otherwise result in a temperature offset. A total of up

format for temperature is summarized in Table 10.

to 3k

Ω of series line resistance is cancelled by the

One LSB equals 0.0625

°C. Negative numbers are

TMP512/13,

eliminating

the

need

for

additional

represented in binary twos complement format.

characterization and temperature offset correction.

Following

power-up

reset,

the

Temperature

See the Remote Temperature Error vs Series

°C until the first conversion is

Resistance typical characteristic curves (Figure 15 )

complete. Unused bits in the Temperature Register

for details on the effects of series resistance and

always read '0'.

power-supply voltage on sensed remote temperature

error.

DIFFERENTIAL INPUT CAPACITANCE

The TMP512/13 contain multiple registers for holding

configuration information, temperature and voltage

The

TMP512/13

can

tolerate

differential

input

measurement results, and status information. These

capacitance of up to 2200pF with minimal change in

registers are described in Table 3.

temperature error. The effect of capacitance on

sensed remote temperature error is illustrated in

POINTER REGISTER

Figure 16, Remote Temperature Error vs Differential

Capacitance. See the Filtering section for suggested

The 8-bit Pointer Register is used to address a given

component values where filtering unwanted coupled

data register. The Pointer Register identifies which of

signals is needed.

the data registers should respond to a read or write

command on the two-wire bus. This register is set

TEMPERATURE MEASUREMENT DATA

with every write command. A write command must be

issued to set the proper value in the Pointer Register

Temperature measurement data may be taken over

before executing a read command. Table 3 describes

an operating range of

–40°C to +125°C for both local

the pointer address of the TMP512/13 registers. The

and remote locations.

power-on reset (POR) value of the Pointer Register is

00h (0000 0000b).

The Temperature Register of the TMP512/13 is

configured as a 13-bit, read-only register that stores

the output of the most recent conversion. Two bytes

must be read to obtain data, and are described in the

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