Datasheet

TMP512

TMP513

SBOS491A –JUNE 2010– REVISED MAY 2011

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Local Temperature Result Register 08h (Read-Only)

BIT # D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

BIT

T12 T11 T10 T9 T8 T7 T6 T5 T4 T3 T2 T1 T0 — PVLD —

NAME

POR

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

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

80 0 0101 0000 0000 0500

75 0 0100 1011 0000 04B0

50 0 0011 0010 0000 0320

25 0 0001 1001 0000 0190

0.25 0 0000 0000 0100 0004

0 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.