Overview of low duty cycle mode

AN4193

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Doc ID 023837 Rev 1

Figure 4.

Current consumption during wakeup

1.2

Programming tips

This section provides some indication of how to program the SPIRIT1 to perform RX in LDC

mode.

Assuming that the transceiver has been properly initialized, the following steps are required

to activate the LDC mode in reception using the SPIRIT C driver:

1.

SpiritTimerSetWakeUpTimerMs (LDC_CYCLE); // Specify the LDC

cycle time in ms

2.

SpiritTimerSetRxTimeoutMs (RX_TIMEOUT); // Specify RX timeout in

ms

3.

SpiritTimerLdcrMode(S_ENABLE); // Enable LDC mode

4.

SpiritCmdStrobeRx(SPIRIT_CMD_RX); // Start RX

The same commands can be performed as a set of registers access as follow (assuming an

LDC cycle of 100 ms and a RX timeout of 1 ms and a crystal of 50 MHz):

1.

WriteRegister(0x55,0x26), WriteRegister(0x56,0x58) # Set LDC

cycle time

2.

WriteRegister(0x53,0x09), WriteRegister(0x54,0x02) # Set Rx

timeout

3.

WriteRegister(0x50, ReadRegister(0x50) | 1) # Set bit 0 of

register 50 to 1 to activate LDC mode

4.

SendStrobe (0x61)

AM16919V1