ML7396AB datasheet(86/140 Pages) LAPIS

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FEDL7396A/B/E-07

ML7396A/B/E

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●Energy Detection value (ED value) adjustment

[ED value adjustment]

ED value is calculated by RSSI signal (analog signal) from RF part,. By performing the following adjustment, it is possible

to correct the variation in LSIs.

The gain adjustment and related registers are described below.

In order to cover wider input range, gain should be changed at given point. Threshold for gain change points are set by

[GAIN_MtoL:B1 0x1C] to [GAIN_MtoH:B0 0x1F]. [RSSI_ADJ_M:B1 0x20] and [RSSI_ADJ_L:B1 0x21] registers are

used to addition values to maintain linearity when changing gain. RSSI slope can be set to [RSSI_VAL_ADJ:B1 0x23] register

so that ED value can be between 0x00(min) and 0xFF(max). For thse register setting, please use the value specified in the

“Initial register setting” file.

Adjusting the input level variation for the same input level can be set to [RSSI_ADJ:B1 0x02] register. It must compensate the

slope before compensation defined by [RSSI_VAL_ADJ:B1 0x23] register. However, if positive value is set , ED value

cannot be decreased down to 0x00 at low input signal level. If negative value is set, ED value cannot be increased up to 0xFF.

ED value

Operation in the High gain range:

RSSI value>GAIN_HtoM, and move to Middle gain.

Operation in the Middle gain range:

RSSI value>GAIN_MtoL, and move to Low gain.

GAIN_MtoH

≥RSSI value, and move to High gain.

Operation in the Low gain range:

GAIN_LtoM

≥RSSIvalue, and move to Middle gain.

Low gain

Operation range

[RSSI_VAL_ADJ:B1 0x23]

[RSSI_ADJ_L:B0 0x21]

RF input level

[RSSI_ADJ_M:B0 0x20]

[GAIN_HtoM:B0 0x1E]

high

low

RSSI value (ADC output)

Middle gain

Operation range

[GAIN_MtoL:B0 0x1C]

High gain

Operation range

[GAIN_LtoTOM:B0 0x1D]

[GAIN_MtoH:B0 0x1F]

[RSSI ADJ:B1 0x02]

ML7396AB Datasheet(PDF) 86 Page - LAPIS Semiconductor Co., Ltd.

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