ML7396AB datasheet(47/140 Pages) LAPIS

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FEDL7396A/B/E-07

ML7396A/B/E

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IDLE detection mode

IDLE detection mode continues CCA until IDLE detection. IDLE detection CCA will be executed when RX_ON is issued

while CCA_EN ([CCA_CNTRL:B0 0x15(4)])=0b1, CCA_IDLE_EN ([CCA_CNTRL:B0 0x15(3)])=0b1 and

CCA_LOOP_START ([CCA_CNTRL:B0 0x15(5)])=0b0 are set.

When AUTO_ACK function is enabled by AUTO_ACK_EN ([AUTO_ACK_SET:B0 0x55(4)])=0b1, if CCA_AUTO_EN

([CCA_CTRL:B0 0x15(7)]) =0b1, CCA IDLE detection mode is performed before transsmitting ACK packet.

And when Address filtering function is enable by setting 0b1 to any bit0 to bit4 of [ADDFIL_CNTRL:B2 0x60] register, if

ADDFIL_IDLE_DET ([PACKET_MODE_SET:B0 0x45(0)])=0b1, CCA IDLE detection mode is performed after address

mismatch detection.

Like normal mode, CCA is determined by average ED value in [ED_RSLT:B0 0x16] register and threshold value defined

by [CCA_LEVEL:B0 0x13] register. If average ED value exceeds CCA threshold, it is determined as “BUSY”, set

CCA_RSLT[1:0] ([CCA_CNTRL:B0 0x15(1-0)]) =0b01. If ED value is smaller than CCA threshold, and maintains IDLE

detection period which is defined by IDLE_WAIT[9:0] of the [IDLE_WAIT_L:B0 0x17], [IDLE_WAIT_H:B0 0x18]

resisters, it is determined as “IDLE”. And CCA_RSLT[1:0] = 0b00 is set. For details operation of IDLE_WAIT[9:0], please

refer to “IDLE detection for long period”.

In IDLE detection mode, only when IDLE is detected, CCA_DONE ([CCA_CNTRL:B0 0x15(2)]) wil be set to 0b1 and

CCA completion interrupt (INT[08] group2) is generated. If CCA operation is performed by CCA_EN=0b1, after IDLE

detection, CCA_EN and CCA_IDLE_EN are reset to 0b0.

Upon clearing CCA completion interrupt, CCA_RSLT[1:0] are reset to 0b00. CCA_RSLT[1:0] should be read before

clearing CCA completion interrupt.

If an ED value exceeds the value defined by [CCA_IGNORE_LEVEL:B0 0x12] register, and as long as a given ED value is

included in the averaging target of ED value calculation, IDLE judgment is not performed. In this case, if average ED value is

smaller than CCA threshold value, IDLE judgment is not determined. And CCA_RSLT[1:0] indicates 0b11. CCA operation

continues until given ED value is out of averaging target and “IDLE” is determined. For details of ED value exceeding

[CCA_IGNORE_LEVEL: B0 0x12] register, please refer to ”IDLE determination exclusion under strong signal input”.

ML7396AB Datasheet(PDF) 47 Page - LAPIS Semiconductor Co., Ltd.