ADE5166 datasheet(120/148 Pages) AD

120 / 148 page

ADE5166/ADE5169/ADE5566/ADE5569

Preliminary Technical Data

Rev. PrB | Page 120 of 148

Because the temperature measurement has a resolution of

0.78°C/LSB and the RTC compensation has a resolution of

2ppm/LSB, XTALOS and XTALGain can be processed using

XTALOS

[7:0] = TEMPADC[7:0]T0

considering the equation of the temperature ADC at 25°C,

XTALOS = 0d123, if T0 is given to be 25°C.

[]

() 14

C/LSB

ppm

−

= k

XTALGain

where:

is a negative number usually presented with the unit of

ppm/°C.

XTALGain

is an unsigned 15-bit number made up of

The automatic correction is disabled by default and can be

enabled by writing 1 to the MS of the XTALG2 register. When

enabled, TEMPCAL can be read but cannot be written by user

code. To successfully perform the autocalibration, a temperature

reading must first be obtained (see the Temperature Measurement

section). This calibration feature is designed to operate in the

background to continually maintain an accurate RTC value

with changing temperature. It is therefore recommended that

temperature measurements be set up to occur automatically in

the background through the peripheral ADC strobe period SFR

(STRBPER, 0xF9). Background measurements occur every 1, 2,

or 8 minutes, depending on the configuration. When the MSB

of XTALG2 is set and background temperature readings are

initiated, the RTC calibration is performed every time a new

temperature measurement is obtained. Note that the

temperature and supply delta SFR (DIFFPROG, 0xF3) does not

have to be set for the RTC temperature compensation to be

operational.

Note that because the RTC temperature compensation is

designed to operate in the background, it does not affect the

temperature, voltage or battery ADC SFRs. These registers are

only updated when configured to do so in the temperature and

supply delta SFR (DIFFPROG, 0xF3) in background mode, or

upon the completion of a single ADC reading initiated by a write

to the start ADC measurement SFR (ADCGO, 0xD8). All of the

ADC measurements can therefore be used in parallel with the

RTC temperature calibration. It should be noted, however, that

the frequency of background temperature measurements is

restricted by the strobe interval set in the peripheral ADC

strobe period (STRBPER, 0xF9) when the RTC temperature

compensation was configured.

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