ADE9113 datasheet(41/55 Pages) AD

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Data Sheet

ADE9103/ADE9112/ADE9113

APPLICATIONS INFORMATION

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Rev. A | 41 of 55

SPI Format Transitions

Using a dedicated SPI configuration, there are two SPI transaction

lengths: a long or short. Within every command packet, the length

of the following SPI transaction is defined as shown in Figure 47.

The main communicating with the ADE9103/ADE9112/ADE9113

must keep track of what size the following SPI transaction is to

output the appropriate number of SCLK pulses. A scenario during

which there are transitions between long and short is as follows:

1. The first successful command received by the microcontroller

unit (MCU) is long.

2. The MCU disables long.

3. The MCU performs all of its register initialization as short SPI

transactions.

4. At the last initialization command, long is enabled, and the MCU

waits for DREADY before reading the ADC samples.

Multiple Devices

Communicating with multiple ADE9103/ADE9112/ADE9113 can be

accomplished through two methods: daisy chain and dedicated SPI.

The method is determined by the hardware configuration of the

ADE9103/ADE9112/ADE9113 and requires no additional configura-

tion.

When using daisy chain, each SPI transaction must be exactly

128 bits multiplied by the number of connected ADE9103/ADE9112/

ADE9113 devices. The entire transaction is shifted through the

connected ADE9103/ADE9112/ADE9113 devices, and each device

only interprets the command packet, which is the last 32 bits of the

input on the MOSI data line at the instant that CS transition high.

Each ADE9103/ADE9112/ADE9113 produces a 128-bit response,

which is transmitted on MISO.

Daisy chain can consist between two and four ADE9112 and

ADE9113 devices. Devices are numbered for timing diagram pur-

poses, incrementing from zero from the main MOSI input. A generic

transaction with four ADE9103/ADE9112/ADE9113 devices can be

found in Figure 53.

While using the dedicated SPI method, each ADE9103/ADE9112/

ADE9113 has its own dedicated CS logic. All ADE9103/ADE9112/

ADE9113 devices share the MOSI and MISO data lines. Transac-

tions can be either short or long. Communication for each individual

ADE9103/ADE9112/ADE9113 functions the same way as when

only a single device is in use. A generic transaction with four

ADE9103/ADE9112/ADE9113 devices using dedicated SPI can be

found in Figure 54.

Figure 53. Multiple Devices - Daisy Chain

Figure 54. Multiple Devices - Dedicated SPI

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