LTC2995 datasheet(69/90 Pages) AD

69 / 90 page

LTM2985

Rev. 0

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APPLICATIONS INFORMATION

The temperature values are input in Kelvin as unsigned

fixed-point values, but the final temperatures reported by

the LTM2985 are reported in °C or °F. The sensor tempera-

ture (Kelvin) follows the convention shown in Table 72,

wherethefirst14bitsaretheintegerpartandtheremaining

10 bits are the fractional part. In this example, a custom

analog sensor is tied to CH2 and is programmed with

the channel assignment data shown in Table 73. In this

case the custom data begins at memory location 0x250

(starting address is 0). The starting address (offset from

0x250) is entered in the analog sensor data pointer field

of the channel assignment data. The table data length –1

(9 in this example) is entered into the data length field of

the analog temperature sensor channel assignment word.

Refer to Table 70 for the location and format of the 10

six-byte table entries.

Figure 54. Active Analog Temperature Sensor Table Example

Table 70. Active Analog Temperature Sensor Example Table Data Memory Map

POINT

SENSOR OUTPUT

VOLTAGE (mV)

TEMPERATURE

KELVIN

START

ADDRESS

STOP

ADDRESS

BYTE 0

BYTE 1

BYTE 2

BYTE 3

BYTE 4

BYTE 5

–50.22

0x250

0x255

–30.2

99.1

0x256

0x25B

–5.3

135.4

0x25C

0x261

20.33

220.3

0x262

0x267

40.2

361.2

0x268

0x26D

mV Data

Temperature Data

55.3

522.1

0x26E

0x273

88.3

720.3

0x274

0x279

132.2

811.2

0x27A

0x27F

188.7

922.5

0x280

0x285

460.4

1000

0x286

0x28B

2985 F54

TEMPERATURE (K)

(0mV, 0K)

NOTE:

P0 SHOULD BE THE

EXTRAPOLATION

POINT TO 0K

VOLTAGE (mV)

VOLTAGE < p1

SOFT FAULT

CONDITION

VOLTAGE > p9

SOFT FAULT

CONDITION

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