AS3900 datasheet(30/59 Pages) AMSCO

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AS3900

Data Sheet - Detail ed Description

8.7 Transmission Modes

After the successful Pairing procedure, the ID-table of the Master REG 0x08 to 0x1F is filled with valid addresses of different Clients in the

surrounding field. All participants of the network are determined after the pairing procedure.

The transmission is usually accomplished time division multiplexed (timer controlled) via the packet mode. Packets can be send bidirectional

from the 8 possible Clients to the Master. The AS3900 is also able to provide a not timer controlled bidirectional fast package mode, a timer

controlled one way package mode and a not timer controlled one way streaming mode. The following table gives an overview about the provided

transmission modes of the AS3900:

Table 26. Transmission Modes

Transmission

Modes

Direction

Method

Description

Table 27. Selection Transmission Modes

Address

The different transmission modes can be set by an appropriate configuration in REG 0x00:

The following chapter describes the bidirectional packet mode that is timer controlled. All other transmission modes listed above are described in

an appropriate application note.

Packet mode

Bidirectional

Timer controlled

Eight possible Clients start to transmit a packet synchronously to the applied

timing information. The Master has stored the timing information for each

Client that wakes up the FSK receiver from Sleep mode at certain point of

times. This mode is very efficient and power saving. Incoming packages are

checked for a valid ID and the data is loaded into the data registers. The

communication is terminated by a handshake. The Master can add to each

acknowledgement 4 bytes of data for the Client (ACP).

Packet mode

One way

Timer controlled

Only one Client starts to transmit a packet that contains the ID and the timing

information (cycle time, random pointer).The Master opens the receive

window according to the stored timing system and compares the IDs. A

synchronization of the timers is performed and the incoming data is loaded

into the data registers which can be read out by the MCU.

Fast packet mode

Bidirectional

Not Timer

controlled

Only one Client starts to transmit a packet asynchronously. The Master is in

permanent receive mode and waits for incoming packages. After comparison

of the ID with the ID-table the incoming data is loaded into the data registers.

The communication is usually terminated by an acknowledgement (ACK). The

Master can add to each acknowledgement 4 bytes of data for the Client

(ACP).

Streaming mode

One way

Not Timer

controlled

Only one Client is allowed for this operation, which ID is stored in the Masters

ID-table. The Client starts to transmit the maximum number of data packets

(26 bytes) asynchronously. The Master is in continuous receive mode, ready

to receive all packets.

0x00

ma_sen

osc32f

timdis

unidir

stream

wake_rx

pwr

bank

Bidirectional Packet Mode

One Way Packet Mode

Fast Packet Mode

Streaming Mode

AS3900 Datasheet(PDF) 30 Page - ams AG

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