LTC2983
48
2983fc
For more information www.linear.com/LTC2983
Example: Differential Thermistor
The differential thermistor configuration allows separate
ground sensing for each sensor. In this standard differ-
ential configuration, one sense resistor is used for each
thermistor. Differential thermistors follow the convention
shown in Figure 25. Terminal 1 ties to CH
THERM
and is
shorted to ground and terminal 2 ties CH
THERM-1
to and
the sense resistor. Channel assignment data (see Table 50)
is mapped to memory locations corresponding to CH
THERM
.
Sense resistor channel assignments follow the general
convention shown in Figure 26. The sense resistor is tied
between CH
RSENSE
and CH
RSENSE-1
, where CH
RSENSE
is
tied to the 2nd terminal of the thermistor. Channel as-
signment data (see Table 33) is mapped into a memory
location corresponding to CH
RSENSE
.
APPLICATIONS INFORMATION
Figure 25. Differential Thermistor Channel Assignment
Convention
Figure 26. Sense Resistor Channel Assignment Convention
2983 F25
2
1
CH
THERM
CH
THERM–1
EXCITATION
CURRENT
FLOW
= CH
THERM
(2 ≤ THERM ≤ 20)
2ND TERMINAL TIES TO SENSE RESISTOR
1ST TERMINAL TIES TO GND
CHANNEL
ASSIGNMENT
CH
RSENSE-1
CH
RSENSE
R
SENSE
EXCITATION
CURRENT
FLOW
= CH
RSENSE
(2 ≤ RSENSE ≤ 20)
CHANNEL
ASSIGNMENT
To Next Page
Loading...