ADE5166_08 AD [Analog Devices], ADE5166_08 Datasheet - Page 45

• Manufacturer Part Number: ADE5166_08
• Description: Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver
• Manufacturer: AD [Analog Devices]

Voltage Channel ADC
Figure 44 shows the ADC and signal processing chain for the
voltage channel. In waveform sampling mode, the ADC outputs
a signed, twos complement, 24-bit data-word at a maximum
of 25.6 kSPS (MCLK/160). The ADC produces an output code
that is approximately between 0x28F5 (+10,485d) and 0xD70B
(−10,485d).
Channel Sampling
The waveform samples of the current ADC and voltage ADC
can also be routed to the waveform registers to be read by the
MCU core. The active, reactive, and apparent power and energy
calculation remain uninterrupted during waveform sampling.
0.5V, 0.25V,
0.125V, 62.5mV,
31.3mV
V2
0V
V
V
P
N
V2
ANALOG
INPUT
RANGE
PGA2
×1, ×2, ×4,
×8, ×16
{GAIN[7:5]}
0xD70B
0x28F5
0x0000
REFERENCE
Figure 44. ADC and Signal Processing in Voltage Channel
ADC
VOLTAGE CHANNEL
WAVEFORM
DATA RANGE
Rev. 0 | Page 45 of 148
HPF
ACTIVE AND REACTIVE
POWER CALCULATION
f
–3dB
MODE1[6]
When in waveform sampling mode, one of four output sample
rates can be chosen by using the DTRT[1:0] bits of the WAVMODE
register (see Table 34 ) . The output sample rate can be 25.6 kSPS,
12.8 kSPS, 6.4 kSPS, or 3.2 kSPS. If the WFSM enable bit is set
in the Interrupt Enable 3 SFR (MIRQENH, Address 0xDB), the
8052 core has a pending ADE interrupt. The sampled signals
selected in the WAVMODE register are latched into the waveform
SFRs when the waveform high byte (WAV1H or WAV2H) is read.
The ADE interrupt stays active until the WFSM status bit is
cleared (see the Energy Measurement Interrupts section).
WAVEFORM SAMPLE
REGISTER
VOLTAGE PEAK DETECT
VOLTAGE RMS (V
CALCULATION
LPF1
= 63.7Hz
rms
0x1DD0
0xDFC9
0xE230
ZX DETECTION
0x0000
0x2037
0x0000
)
ZX SIGNAL
DATA RANGE FOR 50Hz SIGNAL
ZX SIGNAL
DATA RANGE FOR 60Hz SIGNAL
ADE5166/ADE5169