AS3900 datasheet(16/59 Pages) AMSCO

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AS3900

Data Sheet - Detail ed Description

8.2 Operating Modes

The following different operation modes are supported by the AS3900. These operating modes are entered automatically by the link manager

and need not to be set manually. The device enters these modes depending on the current status of the communication. All operating modes

require different current consumptions.

8.2.1 Power-down

Power-down mode is entered after connecting the battery. The POR signal is provided at the POR pin and registers will have their default values.

The lowest current consumption is achieved in this mode. No clock is provided at MCU_CLK pin (the MCU must have other CLK source). The

ENABLE pin LOW is needed to switch to Power-down (DATAO pin is set to High Impedance). Make sure to apply LOW level on the SDI-Interface

to avoid leakage currents via the digital lines.

8.2.2 Standby

No active communication (idle mode), no connection (no synchronization) established between master and client, SDI is operational. Wakeup

Timer and 32 kHz oscillator are running. Wakeup receiver is switched on periodically. Clock can be provided at MCU_CLK pin (divided 27MHz

clock or 32 kHz clock). A Clock Interface Mode selection is required.

8.2.3 Sleep

This mode is active between communication time slots without data transmission. The timer (cycle time) indicate next active communication time

slots. Timers and 32kHz oscillator are active in this mode.

8.2.4 Pairing

Permanent pairing: The device ID of the Clients are permanently stored in the Master (can be overwritten).

Temporary pairing: The device ID of the Clients are not permanently stored. The exchange of communication parameters is done for each

temporary session.

Note: It is important to note that the Pairing procedure must be executed in a clean RF environment. All Clients need to be close to the

Master.

8.2.5 Wakeup

After a Wakeup sequence is received, the exchange of time code is performed and master is synchronized to client time base.

Applying wakeup means, Client (Master) is set to Wakeup receive mode for short time with a long wakeup interval. Master (Client) transmits long

enough wakeup sequence to catch the receiving window of the Client (Master) or the Master is set to Wakeup receive mode for long time to

catch the transmitted Client Wakeup sequences. Once the Client (Master) is woken up, it turns out of Sleep Mode and the time base is

synchronized.

Figure 11. Pairing and Wakeup Principle

Master

Client

ID- A

ID- B

ID- C

Master

Client

keu

irin

Pairing

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