ADE9113 datasheet(30/55 Pages) AD

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Data Sheet

ADE9103/ADE9112/ADE9113

APPLICATIONS INFORMATION

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Rev. A | 30 of 55

ADE9103/ADE9112/ADE9113 are connected, which helps to free

up microcontroller pins for other purposes.

In Figure 37, the CLKOUT/DREADY pin of the ADE9103/ADE9112/

ADE9113 that senses the Phase C current and voltage is connect-

ed to the input and output pin of the microcontroller. CLKOUT/

DREADY provides an active low pulse for 256 CLKIN cycles

(15.625 µs at CLKIN = 16.384 MHz) when the ADC conversion

data is available. It signals when the ADC outputs of all ADE9103/

ADE9112/ADE9113 devices become available and when the mi-

crocontroller starts to read them. See the Synchronizing Multiple

ADE9103/ADE9112/ADE9113 Devices section for more informa-

tion about synchronizing multiple ADE9103/ADE9112/ADE9113 de-

vices.

At power-up, or after a hardware or software reset, follow the

procedure described in the Power-Up Procedure for Systems with

Multiple Devices That Use a Single Crystal section or the Power-Up

Procedure for Systems with Multiple Devices That Use a Clock

Signal Generated from a Microcontroller section to ensure that the

ADE9103/ADE9112/ADE9113 devices function appropriately.

Figure 38. SPI Connection Between Three ADE9103/ADE9112/ADE9113

Devices in a Daisy Chain and a Microcontroller

Figure 39. SPI Connections Between Three ADE9103/ADE9112/ADE9113

Devices and a Microcontroller

DC METERING

The ADE9103/ADE9112/ADE9113 can also be used in DC metering

applications.

Figure 40. DC Current and Voltage Sensing

Figure 40 shows the ADE9112 and ADE9113 as a DC voltage and

current sensor. The DC current, IDC, is sensed with a shunt. A

terminal of the shunt is connected to the IM pin of the ADE9112 and

ADE9113 and becomes the ground, AGND (Pin 11), of the isolated

side of the ADE9112 and ADE9113. The DC+ to DC− voltage, VDC,

is sensed with a resistor divider, and the V1M pin is also connected

to the IM and AGND pins. Note that the voltages measured by the

ADCs of the ADE9112 and ADE9113 are opposite to VDC and IDC, a

classic approach in single-phase metering.

The V2P and V2M voltage channel is intended for a secondary

voltage measurement, and it is available only on the ADE9113. If

V2P is not used, as is the case of the ADE9112, connect V2P to

V2M.

DC applications requiring working voltage capabilities beyond the

ADE9112 and ADE9113 can use the ADE9103 in series with dis-

crete signal and power isolation.

DC Offset Mode

The ADE9103/ADE9112/ADE9113 has a mode where the inputs of

the current channel (IP and IM) can be internally shorted together,

while disconnecting the external pin, to perform an offset measure-

ment without the influence of circuits outside of the IC. This shorting

can happen at any time while powered.

To use DC offset mode, take the following steps:

1. Set the ISO_WR_ACC_EN bit (Bit 0) within the CON-

FIG_ISO_ACC register (Address 0x005) to 1.

2. Wait at least 200 µs.

3. Set the DC_OFFSET_MODE register (Address 0x0CC) to 1.

4. Wait for appropriate settling time for the system and capture

waveform data to perform the offset measurement.

5. Set the DC_OFFSET_MODE register (Address 0x0CC) to 0.

6. Clear the ISO_WR_ACC_EN bit (Bit 0) within the CON-

FIG_ISO_ACC register (Address 0x005) to 0.

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