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ADE75 数据表(PDF) 70 Page - Analog Devices

部件名 ADE75
功能描述  Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver
PDF  148 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADE75 数据表(HTML) 70 Page - Analog Devices

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ADE75xx/ADE71xx
Preliminary Technical Data
Rev. PrE | Page 70 of 148
Location
Mnemonic
7-0
BATVTH
0
The battery ADC value is compared to this register, the battery threshold
register. If BATADC is lower than the threshold, an interrupt is generated.
Table 50. VDCIN ADC value SFR (VDCINADC, 0xEF)
Bit
Location
Bit
Mnemonic
Default
Value
Description
7-0
VDCINADC
0
The external voltage ADC value in this register is updated when a
VDCINADC interrupt occurs.
Table 51. Battery ADC value SFR (BATADC, 0xDF)
Bit
Location
Bit
Mnemonic
Default
Value
Description
7-0
BATADC
0
The battery ADC value in this register is updated when a BATADC interrupt
occurs.
Table 52. Temperature ADC value SFR (TEMPADC, 0xD7)
Bit
Location
Bit
Mnemonic
Default
Value
Description
7-0
TEMPADC
0
The temperature ADC value in this register is updated when a TEMPADC
interrupt occurs.
TEMPERATURE MEASUREMENT
To provide a digital temperature measurement, the
ADE75XX/ADE71XX includes a dedicated ADC. An 8-bit
Temperature ADC value SFR (TEMPADC, 0xD7) holds the
results of the temperature conversion. The resolution of the
temperature measurement is TBD˚C/LSB. There are two ways to
initiate a temperature conversion:
- Single Temperature Measurement
- Background Temperature Measurements
Single Temperature Measurement
Set the TADC bit in the Start ADC Measurement SFR
(ADCGO, 0xD8) to get a temperature measurement. An
interrupt will be generated when the conversion is done and the
temperature measurement is available in the Temperature ADC
value SFR (TEMPADC, 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, 0xF9). Then temperature
measurements will be performed periodically in the
background – see Table 46. 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 in the TEMP_DIFF bits in the Temperature and Voltage
ADC Delta SFR (DIFFPROG, 0xF3), a TEMPADC interrupt is
generated. This allows temperature measurements to take place
completely in the background, only requiring MCU activity if
the temperature has changed more than a configurable delta.
To set up background temperature measurements:
1.
Initiate a single temperature measurement by setting
the TADC bit in the Start ADC Measurement SFR
(ADCGO, 0xD8).
2.
Upon completion of this measurement, configure the
TEMP_DIFF[2:0] bits to establish the change in
temperature that will trigger an interrupt.
3.
Set up the interval for background temperature
measurements by configuring the
TEMP_PERIOD[1:0] bits.
Temperature ADC in PSM1 and PSM2
Depending on the operating mode of the
ADE75XX/ADE71XX, a temperature conversion is initiated
only by certain actions:
PSM0: In this operating mode, the 8052 is active. Temperature
measurements are available in the background measurement
mode and by initiating a single measurement.
PSM1: In this operating mode, the 8052 is active and the part is
powered from battery. Single temperature measurements can be



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