ADE7932 datasheet(86/120 Pages) AD

86 / 120 page

ADE7978/ADE7933/ADE7932

Data Sheet

Rev. 0 | Page 86 of 120

BIT STREAM COMMUNICATION BETWEEN THE

ADE7978 AND THE ADE7933/ADE7932

The ADE7978 extracts information from the ADE7933/

ADE7932 devices of the system using the bit stream communica-

tion shown in Figure 107. The ADE7978 generates a 1.024 MHz

clock signal at the SYNC pin. This clock signal is equal to 1/16

of the ADE7978 internal clock, CLKIN (CLKIN/16 = 1.024 MHz

for XTALIN = 16.384 MHz) and one-fourth of the ADE7933/

ADE7932 XTAL1 clock (CLKIN/4). The duty cycle of this clock

is 25%.

The low to high transition of SYNC is generated one-fourth of

a cycle before a high to low transition of the CLKIN/4 clock.

SYNC stays high for one CLKIN/4 cycle and stays low for the

rest of the period.

After the first high to low transition of SYNC, the ADE7978

CLKIN/4 transitions from high to low four times. At each high

to low transition of CLKIN/4, the ADE7933/ADE7932 devices

place these bits on the DATA pin: the bits coming from the first

stage of the ADCs and the bits of the temperature offset stored

in the ADE7933/ADE7932 devices. The order of the bits on the

Phase A ADE7933/ADE7932 is VA bit, VA2 bit, temperature

offset bit, and IA bit. The other ADE7933/ADE7932 devices

follow the same pattern. The ADE7978 receives these bits at its

DATA_A, DATA_B, DATA_C, and DATA_N pins. The process is

repeated when a new high to low transition takes place on SYNC.

The delimiters identifying the 8-bit signed number representing

the temperature offset are shown in Figure 108.

Any master device that can generate a 1.024 MHz SYNC signal

like the one shown in Figure 107 and can filter the bit streams

coming from the DATA pins of the ADE7933/ADE7932 devices

can replace the ADE7978.

ADE7978

CLKIN/4

SYNC

DATA_A

DATA_B

DATA_C

DATA_N

IA BIT

VA BIT

VA2 BIT

TEMP OFFSET

IB BIT

VB BIT

VB2 BIT

TEMP OFFSET

IC BIT

VC BIT

VC2 BIT

TEMP OFFSET

IN BIT

VN1 BIT

VN2 BIT

TEMP OFFSET

IA BIT

IB BIT

IC BIT

IN BIT

Figure 107. Bit Stream Communication Between the ADE7978 and the ADE7933/ADE7932 Devices

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

4 LEAST SIGNIFICANT

BITS OF TEMPERATURE

OFFSET

4 MOST SIGNIFICANT

BITS OF TEMPERATURE

OFFSET

Figure 108. Temperature Offset Bit Stream Communication

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