SE98ATP datasheet(21/43 Pages) NXP

21 / 43 page

SE98A_4

Product data sheet

Rev. 04 — 25 November 2009

21 of 43

NXP Semiconductors

SE98A

DDR memory module temp sensor, 1.7 V to 3.6 V

8.4 Temperature format

The 16-bit value used in the following Trip Point Set and Temperature Read-Back

registers is 2’s complement with the Least Significant Bit (LSB) equal to 0.0625

°C. For

example:

• A value of 019Ch will represent 25.75 °C

• A value of 07C0h will represent 124 °C

• A value of 1E64h will represent −25.75 °C.

The resolution is 0.125

°C. The unused LSB (bit 0) is set to ‘0’. Bit 11 will have a resolution

of 128

°C.

The upper 3 bits of the temperature register indicate Trip Status based on the current

temperature, and are not affected by the status of the EVENT output.

Table 11 lists the examples of the content of the temperature data register for positive and

negative temperature for two scenarios of status bits: status bits = 000b and

status bits = 111b.

Table 11.

Degree Celsius and Temperature Data register

Temperature

Content of Temperature Data register

Status bits = 000b

Status bits = 111b

Binary

Hex

Binary

Hex

+125

°C

000 0 01111101 000 0

07D0h

111 0 01111101 000 0

E7D0h

+25

°C

000 0 00011001 000 0

0190h

111 0 00011001 000 0

E190h

°C

000 0 00000001 000 0

0010h

111 0 00000001 000 0

E010h

+0.25

°C

000 0 00000000 010 0

0004h

111 0 00000000 010 0

E004h

+0.125

°C

000 0 00000000 001 0

0002h

111 0 00000000 001 0

E002h

°C

000 0 00000000 000 0

0000h

111 0 00000000 000 0

E000h

−0.125 °C

000 1 11111111 111 0

1FFEh

111 1 11111111 111 0

FFFEh

−0.25 °C

000 1 11111111 110 0

1FFCh

111 1 11111111 110 0

FFFCh

−1 °C

000 1 11111111 000 0

1FF0h

111 1 11111111 000 0

FFF0h

−20 °C

000 1 11110100 000 0

1F40h

111 1 11110100 000 0

FF40h

−25 °C

000 1 11100111 000 0

1E70h

111 1 11100111 000 0

FE70h

−55 °C

000 1 11001001 000 0

1C90h

111 1 11001001 000 0

FC90h

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