REV. A

ADE7759

–31–

Mode Register (06H)

The ADE7759 functionality is configured by writing to the mode register—see Figure 45. Table VI summarizes the functionality of

each bit in the mode register.

Table VI. Mode Register

Bit

Bit

Location

Mnemonic

Description

0

DISHPF

The HFP (high-pass filter) in Channel 1 is disabled when this bit is set.

1

DISLPF2

The LPF (low-pass filter) after the multiplier (LPF2) is disabled when this bit is set.

2

DISCF

The frequency output CF is disabled when this bit is set.

3

DISSAG

The line voltage sag detection is disabled when this bit is set.

4

ASUSPEND

By setting this bit to Logic 1, both ADE7759s’ A/D converters can be turned off. In normal

operation, this bit should be left at Logic 0. All digital functionality can be stopped by suspending

the clock signal at CLKIN pin.

5

TEMPSEL

The temperature conversion starts when this bit is set to 1. This bit is automatically reset to

0 when the temperature conversion is finished.

6SWRST

Software Chip Reset. A data transfer should not take place to the ADE7759 for at least 18

µs after

a software reset.

7

CYCMODE

Setting this bit to Logic 1 places the chip in line cycle energy accumulation mode.

8DISCH1

ADC 1 (Channel 1) inputs are internally shorted together.

9DISCH2

ADC 2 (Channel 2) inputs are internally shorted together.

10

SWAP

By setting this bit to Logic 1 the analog inputs V2P and V2N are connected to ADC 1 and the

analog inputs V1P and V1N are connected to ADC 2.

12, 11

DTRT1, 0

These bits are used to select the waveform register update rate.

DTRT1

DTRT0

Update Rate

00

27.9 kSPS (CLKIN/128)

01

14 kSPS (CLKIN/256)

10

7 kSPS (CLKIN/512)

11

3.5 kSPS (CLKIN/1024)

14, 13

WAVSEL1, 0

These bits are used to select the source of the sampled data for the waveform register.

WAVSEL1, 0

Length

Source

00

24 bits

Active Power Signal (output of LPF2)

01

40 bits

Channel 1 and Channel 2

10

24 bits

Channel 1

11

24 bits

Channel 2

15

TEST1

Writing a Logic 1 to this bit position places the ADE7759 in test mode. This is intended for fac-

tory testing only and should be left at 0.