1EDI2002AS_15 Datasheet, PDF (27/147 Pages) Infineon Technologies AG – Single Channel Isolated Driver for Inverter Systems AD Step

EiceDRIVER™ SIL
1EDI2002AS
Functional Description
The input signal NCS is sampled at a rate corresponding to the period of the internal clock derived from OSC1. If
the same external signal value is sampled two times consecutively, the signal is considered as valid and is
processed by the SPI logic. Otherwise, the transition is considered as a glitch and is discarded.
2.4.4.3 Definitions
Command
A command is a high-level command issued by the SPI master which aims at generating a specific reaction in the
addressed slave. The command is physically translated into a Request Message by the SPI master. The correct
reception of the Request Message by the SPI slave leads to a specific action inside the slave and to the emission
of an Answer Message by the slave.
Example: the READ command leads to the transfer of the value of the specified register from the device to the SPI
master.
Word
A word is a 16-bit sequence of shifted data bits.
Transfer
A transfer is defined as the SPI data transfers (in both directions) occurring between a falling edge of NCS and
the next consecutive rising edge of NCS.
Request Message
A request message is a word issued by the SPI master and addressing a single slave. A request message relates
to a specific command.
Answer Message
An answer message is a well-defined word issued by a single SPI slave as a response to a request message.
Transmit Frame
A transmit frame is a sequence of one or several words sent by the SPI Master within one SPI transfer. In regular
SPI topologies, a transmit frame is in practice identical to a data word. In daisy chain topologies, a transmit frame
is a sequence of data words belonging to different request messages.
Receive Frame
A receive frame is a sequence of one or several words received by the SPI Master within one SPI transfer. In
regular SPI topologies, a receive frame is in practice identical to a data word. In daisy chain topologies, a receive
frame is a sequence of data words belonging to different Answer Messages.
The SPI protocol supported by the 1EDI2002AS is based on the Request / Answer principle. The master sends a
defined request message to which the slave answers with the corresponding answer message (Figure 2-8,
Figure 2-9). Due to the nature of the SPI interface, the Answer Message is shifted, compared to the Request
Message, by one SPI transfer. It means, for example, that the last word of answer message n is transmitted by
the slave while the master sends the first word of request message n+1.
Datasheet
27
Hardware Description
Rev. 3.1, 2015-07-30