ADE7933 datasheet(41/125 Pages) AD

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Data Sheet

ADE7978/ADE7933/ADE7932/ADE7923

Rev. D | Page 41 of 125

Second Voltage Channel and Temperature Measurement

Figure 56 shows the ADC and signal processing chain for the

VA2 input in the voltage channel (ADE7933 and ADE7923).

The VB2, VC2, and VN2 channels have similar processing

chains. The V2P input pin of the ADE7933 and ADE7923 is

multiplexed with a temperature sensor. On the ADE7932, the

Vx2 channel is not available, and the V2P pin must be

connected to the VM pin. On the ADE7933, if no voltage is

monitored at the V2P pin, connect the V2P pin to the VM pin.

On the ADE7933 and ADE7923, the selection of the second

voltage channel or the temperature sensor is based on the state

of the V2/TEMP pin. Connect the V2/TEMP pin of the ADE7933/

ADE7932 and ADE7923 to the appropriate pin of the ADE7978

(see Figure 1 and Table 17).

Table 17. Connecting the ADE7933/ADE7932 and ADE7923

V2/TEMP Pin to the ADE7978

ADE7933/ADE7932

and ADE7923

MonitorsThis Phase

V2/TEMP Pin of the ADE7933/ADE7932

and ADE7923 Connected to This Pin on

the ADE7978

Phase A

VT_A

Phase B

VT_B

Phase C

VT_C

Phase N

VT_N

Although the Vx2 channel is not available on the ADE7932,

the V2/TEMP pin must still be connected to the corresponding

VT_A, VT_B, VT_C, or VT_N pin of the ADE7978.

The V2/TEMP pin is also used during the reset procedure

of the ADE7933/ADE7932 and ADE7923 (see the Hardware

Reset section).

On the ADE7978, the selection of the second voltage channel

or the temperature sensor is based on Bits[3:0] (VN2_EN,

VC2_EN, VB2_EN, and VA2_EN) in the CONFIG3 register

(Address 0xE708). When these bits are set to 1 (the default value),

the VT_A, VT_B, VT_C, and VT_N pins are set high, and VA2,

VB2, VC2, and VN2 are measured. When the bits are cleared to

0, the VT_A, VT_B, VT_C, and VT_N pins are set low, and the

temperature sensors of each ADE7933/ADE7932 and ADE7923

are measured. This is true even on the ADE7932 where the

temperature sensor is always measured.

+0.5V

ANALOG INPUT RANGE

–0.5V

0x512D40 =

+5,320,000

VOLTAGE CHANNEL DATA RANGE

WHEN V2P IS SELECTED

ADC OUTPUT RANGE

0xFFAED2C0 =

–5,320,000

AV2GAIN[23:0]

HPFEN BIT

CONFIG[4]

HPF

VOLTAGE RMS (AV2RMS)

CALCULATION

VA2WV WAVEFORM

SAMPLE REGISTER

REFERENCE

PHASE A

ADE7933

Σ-Δ

MODULATOR

V2P

VIN

DIGITAL

LPF

BIT 0 (VA2_EN) IN

CONFIG3 REGISTER

SET TO 1

ADE7978

TEMPERATURE

SENSOR

VT_A

VIN

Figure 56. Phase A V2P Channel Datapath (ADE7933 and ADE7923)

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