ADE7932 datasheet(36/120 Pages) AD

36 / 120 page

ADE7978/ADE7933/ADE7932

Data Sheet

Rev. 0 | Page 36 of 120

Second Voltage Channel and Temperature Measurement

Figure 48 shows the ADC and signal processing chain for the

Input VA2 in the voltage channel (ADE7933 only). The VB2,

VC2, and VN2 channels have similar processing chains. The

V2P input pin of the ADE7933/ADE7932 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/ADE7932, 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 to the appropriate pin of the ADE7978 (see Figure 1

and Table 15).

Table 15. Connecting the ADE7933/ADE7932 V2/TEMP Pin

to the ADE7978

ADE7933/ADE7932

MonitorsThis Phase

V2/TEMP Pin of the ADE7933/ADE7932

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 (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 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 48. Phase A V2P Channel Datapath (ADE7933 Only)

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