ADE5166 datasheet(76/156 Pages) AD

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ADE5166/ADE5169/ADE5566/ADE5569

Rev. B | Page 76 of 156

TEMPERATURE MEASUREMENT

To provide a digital temperature measurement, each ADE5166/

ADE5169/ADE5566/ADE5569 includes a dedicated ADC. The

8-bit temperature ADC value SFR (TEMPADC, Address 0xD7)

holds the results of the temperature conversion. The resolution of

the temperature measurement is 0.83°C/LSB. There are two ways

to initiate a temperature conversion: a single temperature measure-

ment or background temperature measurements.

Single Temperature Measurement

Set the TEMP_ADC_GO bit (Bit 1) in the start ADC measure-

ment SFR (ADCGO, Address 0xD8) to obtain a temperature

measurement (see Table 52). An interrupt is generated when the

conversion is complete and when the temperature measurement

is available in the temperature ADC value SFR (TEMPADC,

Address 0xD7).

Background Temperature Measurements

Background temperature measurements are disabled by default.

To configure the background temperature measurement mode,

set a temperature measurement interval in the peripheral ADC

strobe period SFR (STRBPER, Address 0xF9). Temperature mea-

surements are then performed periodically in the background (see

Table 50).

When a temperature conversion completes, the new temperature

ADC value is compared to the last temperature ADC value that

created an interrupt. If the absolute difference between the two

values is greater than the setting of the TEMP_DIFF bits in the

temperature and supply delta SFR (DIFFPROG, Address 0xF3[5:3]),

a TEMPADC interrupt is generated (see Table 51). This allows

temperature measurements to take place completely in the back-

ground, requiring MCU activity only if the temperature changes

more than a configurable delta.

To set up background temperature measurement

Initiate a single temperature measurement by setting the

TEMP_ADC_GO bit in the start ADC measurement SFR

(ADCGO, Address 0xD8[1]).

Upon completion of this measurement, configure the

TEMP_DIFF bits in the temperature and supppy delta SFR

(DIFFPROG, Address 0xF3[5:3]) to establish the change in

temperature that triggers an interrupt.

Set up the interval for background temperature measurements

by configuring the TEMP_PERIOD bits in the peripheral

ADC strobe period SFR (STRBPER, Address 0xF9[1:0]).

Temperature ADC in PSM0, PSM1, and PSM2 Modes

Depending on the operating mode of the ADE5166/ADE5169/

ADE5566/ADE5569, a temperature conversion is initiated only

by certain actions.

•

In PSM0 operating mode, the 8052 is active. Temperature

measurements are available in the background measurement

mode and by initiating a single measurement.

•

In PSM1 operating mode, the 8052 is active, and the part

is battery powered. Single temperature measurements

can be initiated by setting the TEMP_ADC_GO bit in the

start ADC measurement SFR (ADCGO, Address 0xD8[1]).

Background temperature measurements are not available.

•

In PSM2 operating mode, the 8052 is not active. Temperature

conversions are available through the background measure-

ment mode only.

The temperature ADC value SFR (TEMPADC, Address 0xD7)

is updated with a new value only when a temperature ADC

interrupt occurs.

Temperature ADC Interrupt

The temperature ADC can generate an ADC interrupt when at

least one of the following conditions occurs:

•

The difference between the new temperature ADC value and

the last temperature ADC value generating an ADC interrupt

is larger than the value set in the TEMP_DIFF bits.

•

The temperature ADC conversion, initiated by setting start

ADC measurement SFR (ADCGO, Address 0xD8), finishes.

When the ADC interrupt occurs, a new value is available in the

temperature ADC value SFR (TEMPADC, Address 0xD7). Note

that there is no flag associated with this interrupt.

BATTERY MEASUREMENT

To provide a digital battery measurement, each ADE5166/

ADE5169/ADE5566/ADE5569 includes a dedicated ADC. The

battery measurement is available in the 8-bit battery ADC value

SFR (BATADC, Address 0xDF). The battery measurement has a

resolution of 14.6 mV/LSB. A battery conversion can be initiated

by two methods: a single battery measurement or background

battery measurements.

Single Battery Measurement

To obtain a battery measurement, set the BATT_ADC_GO bit in

the start ADC measurement SFR (ADCGO, Address 0xD8[0]).

An interrupt is generated when the conversion is done and when

the battery measurement is available in the battery ADC value SFR

(BATADC, Address 0xDF).

Background Battery Measurements

To configure background measurements for the battery, establish a

measurement interval in the peripheral ADC strobe period SFR

(STRBPER, Address 0xF9). Battery measurements are then

performed periodically in the background (see Table 50).

When a battery conversion completes, the battery ADC value is

compared to the low battery threshold, established in the battery

detection threshold SFR (BATVTH, Address 0xFA). If the battery

ADC value is below this threshold, a low battery flag is set. This

low battery flag is the FBAT bit (Bit 2) in the power management

interrupt flag SFR (IPSMF, Address 0xF8), used for power supply

management. This low battery flag can be enabled to generate

the PSM interrupt by setting the EBAT bit (Bit 2) in the power

management interrupt enable SFR (IPSME, Address 0xEC).

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