ADuC7023BCBZ62I-R7 datasheet(35/96 Pages) AD

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Data Sheet

ADuC7023

| Page 35 of 96

The ADCCON register must be configured to 0x37A3.

To calculate die temperature use the following formula:

T − TREF = (VADC − VTREF) × K

where:

T is the temperature result.

TREF is 25°C.

VADC is the average ADC result from two consecutive

conversions.

VTREF is 1369 mV, which corresponds to TREF = 25°C as

described in Table 1.

K is the gain of the ADC in temperature sensor mode as

determined by characterization data, K = 0.2262°C/mV. This

corresponds to 1/V TC specification as shown in Table 1.

Using the default values from Table 1 and without any calibra-

tion, this equation becomes

T – 25°C = (VADC − 1369) × 0.2262

where:

VADC is in millivolts.

For increased accuracy, perform a single point calibration at a

controlled temperature value.

For the calculation shown without calibration, (TREF, VTREF) =

(25°C, 1369 mV). The idea of a single point calibration is to use

other known (TREF, VTREF) values to replace the common (25°C,

1369 mV) for every part.

For some users, it is not possible to get such a known pair. For

these cases, an ADuC7023 comes with a single point calibration

value loaded in the TEMPREF register. For more details on this

During production testing of the ADuC7023, the TEMPREF

will have a different value in the TEMPREF register. Using this

single point calibration, use the same formula as shown:

T − TREF = (VADC − VTREF) × K

where:

TREF is 27°C when using the TEMPREF register method, but is

not guaranteed.

TTREF can be calculated using the TEMPREF register.

TSCON Register

Name:

TSCON

Address:

0xFFFF0544

Default value:

0x00

Access:

Read/write

Table 28. TSCON MMR Bit Designations

Bit

Description

7 to 1

Reserved.

Temperature sensor chop enable bit.

This bit is set to 1 to enable chopping of the internal

amplifier to the ADC.

This bit is cleared to disable chopping.

This bit is cleared by default.

TEMPREF Register

Name:

TEMPREF

Address:

0xFFFF0548

Default value:

Factory configured

Access:

Read/write

Table 29. TEMPREF MMR Bit Designations

Bit

Description

15 to 9

Reserved.

Temperature reference voltage sign.

7 to 0

Temperature sensor offset calibration voltage.

To calculate the VTREF from the TEMPREF register,

perform the following calculation:

If TEMPREF sign negative, subtract TEMPREF from 2292

CTREF

= 2292 − TEMPREF[7:0]

where TEMREF[8] = 1.

If TEMREF sign positive, add TEMPREF to 2292

CTREF = TEMPREF[7:0] + 2292

where:

TEMPREF[8] = 0.

Then,

VTREF

= (CTREF × VREF)/4096 × 1000

where:

CTREFis calculated as above.

VREF is 2.5 V, internal reference voltage.

Insert VTREF into

T – TREF = (VADC – VTREF) × K

where:

TREF is 27°C, when using TEMREF register.

VADC is the average ADC result from two

consecutive conversions.

VTREF is calculated as above.

Note that ADC code value 2292 is a default value

when using the TEMREF register. It is not an exact

value and must only be used with the TEMPREF

Rev. E

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