ML7344CE datasheet(73/154 Pages) LAPIS

73 / 154 page

FEDL7344C/E/J-05

ML7344C/E/J

73/154

NOTE:

*1 Digital filter delay is “AD conversion time * 8”. AD conversion time can be slected by ADC_CLK_SEL

([ADC_CLK_SET: B1 0x08(4)]). Reset value is 1.73MHz and AD conversion time is 18.5μs.

(2) Continuous mode

Continuous mode continues CCA untill terminated by the host MCU. CCA continuous mode will be executed

when RX_ON is issued while CCA_EN(CCA_CTRL: B0 0x39(4)])=0b1, CCA_CPU_EN(CCA_CTRL: B0

0x39(5)])=0b1 and CCA_IDLE_EN(CCA_CTRL: B0 0x39(6)])=0b0 are set.

Like normal mode, CCA judgement is determined by average ED value in [ED_RSLT: B0 0x3A] register and

CCA threshold defined by [CCA_LVL: B0 0x37] register. IF average ED value exceeds the CCA threshold

value, it is considered as “BUSY”. And CCA_RSLT[1:0]([CCA_CTRL: B0 0x39(1-0)]) = 0b01 is set.

If average ED value is smaller than CCA threshold value and maintains IDLE detection period which is

defined by IDLE_WAIT[9:0] of the [IDLE_WAIT_L: B0 0x3B], [IDLE_WAIT_H: B0 0x3C] registers, it is

considered as “IDLE”. And CCA_RSLT[1:0] =0b00 is set. For details operation of CCA_IDLE_WAIT[9:0],

please refer to ”IDLE detection for long time period”.

If an ED value exceeds the value defined by [CCA_IGNORE_LVL: B0 0x36] register, a given ED value is

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

average ED value exceeds CCA threshold level, it is considered as “BUSY” and CCA_RSLT[1:0] indicates

0b01. If average ED value is smaller than CCA threshold level, IDLE judgement is not determined. And

CCA_RSLT[1:0] indicates 0b11. For details operation of ED value execeeding [CCA_IGNORE_LVL: B0

0x36] register, please refer to ”IDLE determination exclusion under strong signal input”.

Continuous mode does not stop when “BUSY” or “IDLE” is detected. CCA operation continues until 0b1 is

set to CCA_STOP([CCA_CTRL: B0 0x39(7)]). Result is updated every time ED value is acquired. CCA

completion interrup (INT[18] group3) will not be generated.

ML7344CE Datasheet(PDF) 73 Page - LAPIS Semiconductor Co., Ltd.