LTC2995 datasheet(88/90 Pages) AD

88 / 90 page

LTM2985

Rev. 0

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CUSTOM THERMISTORS

A custom thermistor tied to CH5, with a sense resistor on

CH3/4, is programmed with the channel assignment data

shown in Table 102 (refer to Figure 27 for a 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 assignment data. The data

length (set to 0) is always six 32-bit floating point words.

Table 102. Custom Steinhart-Hart 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

Steinhart-Hart

11010 1 1 0 1 0

(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 Steinhart-

Hart Length Always

Set to 0

Fixed at Six

32-Bit Words

000000

0 0 0 0 0 0

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