TMP512 datasheet(44/62 Pages) TI2

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TMP512

TMP513

SBOS491A

– JUNE 2010 – REVISED MAY 2011

www.ti.com

Local Temperature Result Register 08h (Read-Only)

BIT #

D15

D14

D13

D12

D11

D10

BIT

T12

T11

T10

—

PVLD

—

NAME

POR

VALUE

The data format is 13 bits, 0.0625

°C per bit. Full-scale allows display up to ±256°C.

T12

–T0:

Temperature Result

Bits 15-3

Shows the temperature result according to the format shown in Table 10.

Table 10. 13-Bit Temperature Data Format

TEMPERATURE (

°C)

DIGITAL OUTPUT (BINARY)

HEX

150

0 1001 0110 0000

0960

128

0 1000 0000 0000

0800

127.9375

0 0111 1111 1111

07FF

100

0 0110 0100 0000

0640

0 0101 0000 0000

0500

0 0100 1011 0000

04B0

0 0011 0010 0000

0320

0 0001 1001 0000

0190

0.25

0 0000 0000 0100

0004

0 0000 0000 0000

0000

–0.25

1 1111 1111 1100

1FFC

–25

1 1110 0111 0000

1E70

–55

1 1100 1001 0000

1C90

For positive temperatures (for example, +50

°C):

Twos complement is not performed on positive numbers. Therefore, simply convert the number to binary code

with the 13-bit, left-justified format, and MSB = 0 to denote a positive sign.

Example: (+50

°C)/(0.0625°C/count) = 800 = 320h = 0011 0010 0000

For negative temperatures (for example,

–25°C):

Generate the twos complement of a negative number by complementing the absolute value binary number and

adding 1. Denote a negative number with MSB = 1.

Example: (

–25°C)/(0.0625°C/count) = 400 = 190h = 0001 1001 0000

Twos complement format: 1110 0110 1111 + 1 = 1110 0111 0000

PVLD

Power Valid Flag

Bit 1

This bit is the power valid flag.

The TMP512/13 do not start a temperature conversion if the power supply is not valid. If the voltage is less than

2.7V during a conversion, the PVLD bit is set to '1' and the temperature result may be incorrect.

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