ML7344J datasheet(58/151 Pages) ETC2

58 / 151 page

FEDL7344C/E/J-04

ML7344C/E/J

58/151

●Timer Function

●Wake-up timer

ML7344 has automatic wake-up function using wake-up timer. The following operations are possible by using

wake-up timer.

• Upon timer completion, automatically wake-up from SLEEP state. After wake-up operation can be selected

as RX_ON state or TX_ON state by WAKEUP_MODE ([SLEEP/WU_SET: B0 0x2D(6)]).

• By setting WUT_1SHOT_MODE ([SLEEP/WU_SET: B0 0x2D(7)]), continuous wake-up operation

(interval operation) or one shot operation can be selected

• In interval operation, if RX_ON/TX_ON state is caused by wake-up timer, continuous operation timer is in

operation.

• After moving to RX_ON state by wake-up timer, when continuous operation timer completed, move to

SLEEP state automatically. However, if SYncWord is detected before timer completion, RX_ON state will

be maintained. In this case, ML7344 does not go back to SLEEP state automatically. SLEEP setting

(SLEEP_EN ([SLEEP/WU_SET: B0 0x2D(0)])=0b1) is necessary to go back to SLEEP state. However, if

RXDONE_ MODE[1:0] ([RF_STATUS_CTRL:B0 0x0A(3-2)])=0b11, after RX completion, move to

SLEEP state automatically.

For ML7344C, when continuous operation timer completed, the condition for continuing reception is

selected from Sync Word detection or Field check result by RCV_CONT_SEL([C_CHECK_CTRL: B0

0x1B(5)]).

• After moving to TX_ON state by wake-up timer, when continuous operation timer completed, move to

SLEEP state automatically.

• After wake-up by combining with high speed carrier checking mode, CCA is automatically performed, if

IDLE is detected, able to move to SLEEP state immediately. For details, please refer to the “(3) high speede

carrier detection mode”.

• By setting WU_CLK_SOURCE ([SLEEP/WU_SET:B0 0x2D(2)]), clock source for wake-up timer are

selectable from EXT_CLK pin or on-chip RC OSC.

Wake-up interval, wake-up timer interval and continuous operation timer can be calculated in the following

formula.

Wake-up interval [s] = Wake-up timer interval [s] + Continuous operation timer [s]

Wake-uptimer interval [s] = Wake-up timer clock cycle *

Division setting ([WUT_CLK_SET: B0 0x2E(3-0)]) *

(Wake-up timer interval setting ([WUT_INTERVAL_H/L: B0 0x2F/0x30]) + 1)

Continuous operation timer [s] = Wake-up timer clock cycle *

Division setting([WUT_CLK_SET: B0 0x2E(7-4)]) *

(Continuous operation timer setting ([WU_DURATION: B0 0x31]) – 1)

NOTE:

• In case of moving to TX_ON state after wake-up, move to SLEEP state when timer completed even in the

middle of transmission. Continuous oeration timer should be set in such manner that timer completing after

TX completion.

• WUDT_CLK_SET[3:0] ([WUT_CLK_SET: B0 0x2E(7-4)]) and WUT_CLK_SET[3:0] ([WUT_CLK_

SET: B0 0x2E (3-0)]) can be set independently.

• Minimum value for wake-up timer interval setting ([WUT_INTERVAL_H/L: B0 0x2F/0x30]) is 0x02. And

minimum value for continuous operation timer setting ([WU_DURATION: B0 0x31]) is 0x01.

• Be noted that the SyncWord detection is not issued when in DIO mode with RXDIO_CTRL([DIO_SET: B0

0x0C(7-6)])=0b01. Therefore, when continuous operation timer completed, forcibly move to SLEEP state.

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