LTC2995 datasheet(86/90 Pages) AD

86 / 90 page

LTM2985

Rev. 0

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CUSTOM THERMISTORS

Table 98. Example Thermistor Temperature Values

BYTE 1

BYTE 2

BYTE 3

B23 B22 B21 B20 B19 B18 B17 B16 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0

Temperature 213 212 211 210 29

20 2–1 2–2 2–3 2–4 2–5 2–6 2–7 2–8 2–9 2–10

457.5 0

400.2 0

372.3 0

320.1 0

290.55 0

249.32 0

240.3 0

230 0

215.3 0

200 0

Table 99. Custom Thermistor Channel Assignment Data

CONFIGURATION

FIELD

DESCRIPTION # BITS

BINARY

DATA

MEMORY

ADDRESS 0x210

MEMORY

ADDRESS 0x211

MEMORY

ADDRESS 0x212

MEMORY

ADDRESS 0x213

(1) Thermistor Type

Custom Table

11011 1 1 0 1 1

(2) Sense Resistor

Channel Pointer

CH4

00100

0 0 1 0 0

(3) Sensor

Configuration

Single-Ended

100

1 0 0

(4) Excitation Current

1µA

0011

0 0 1 1

Not Used

Set These Bits

to 0

0 0 0

(5) Custom Thermistor

Data Pointer

Start Address

= 20

010100

0 1 0 1 0 0

(6) Custom Thermistor

Length-1

Length –1 = 9

001001

0 0 1 0 0 1

In this example, a custom thermistor tied to CH5, with a

sense resistor on CH3/4, is programmed with the channel

assignment data shown in Table 99 (refer to Figure 27

for similar format). In this case the custom data begins

at memory location 0x2C8 (starting address is 20). The

starting address (offset from 0x250) is entered in the

custom thermistor data pointer field of the channel as-

signment data. The table data length –1 (9 in this case)

is entered into the custom thermistor data length field of

the thermistor channel assignment word.

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