ZSSC3240CC1B datasheet(21/64 Pages) RENESAS

21 / 64 page

ZSSC3240

Datasheet

Nov.27.20

Page 21

Application

Front-End Configuration, Temperature Sensor Application, and Connection Circuit

Setup and Comments

PGA

VTP

VTN

Internal

Temp.

Sensor

TEXT

Rt´

extr a_rt

INP

INN

VSSB

VDDB

Sensor

Element

Sensor

Bias

Current

Rsens

Regulated Voltage,

VDDA

Vsup

Temperature sensor with

internal Rt with ratiometric

supply

 Sensor element supplied

through the ZSSC3240-

internal regulated voltage

VDDA, i.e. radiometric

supply

 temp_source = 101

BIN

 internal_rt = User selected

 extra_rt = 0

BIN

Note: Only combine this T4

application with

sensor_sup = 00BIN (i.e.,

main sensing application S1

in Table 13)

PGA

VTP

VTN

Internal

Temp.

Sensor

TEXT

Rt´

extr a_rt

INP

INN

VSSB

VDDB

Sensor

Element

Rsens

Regulated Voltage,

VDDA

Rt,external

Sensor

Bias

Current

Temperature Sensor with

external Rt with ratiometric

supply

 Sensor element supplied

through the ZSSC3240-

internal regulated voltage

VDDA; i.e., the

radiometric supply

 temp_source = 110

BIN

 internal_rt = any value

close to the external Rt

value

 extra_rt = 0

BIN

Note: Only combine this T5

application with

sensor_sup = 00BIN only (i.e.,

main sensing application S1

in Table 13)

When using scenario T1, “Bridge as the temperature sensor with the internal Rt in Current Mode” in Table 15,

the setup for bias current (Isup) and internal Rt must fulfill the requirements given in Equation 4 and Equation 5:

(0.5

 R

sens + Rt)

 I

sup = 0.85V ±125mV

Equation 4

Where Rsens is the nominal resistance of the sensor element; i.e. the typical, effective resistance

generating the differential sensor signal as input to the INP and INN pads.

Important: Take into consideration the maximum specifications for the PGA common mode input

level, VCmin (see Table 4).

(MAX[Rsens ] – MIN[Rsens])

 I

sup

< 700mV

Equation 5

Important: Take into consideration the maximum specifications for the input signal, MAX[VDIFFin]

(see Table 4).

The best method for deriving the respective values for Rt and Isup is to choose an Rt value close to but greater

than Rsens and to calculate Isup accordingly.

When using scenario T4, “Temperature sensor with internal Rt with ratiometric supply,” in Table 15 the setup for

bias current (Isup) and internal Rt must fulfill Equation 6:

Important: Take into consideration the maximum specifications for the PGA common mode input

level, VCmin, which is automatically ensured if Rt and the extra Rt

’ are selected.

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