ML7406 datasheet(91/104 Pages) LAPIS

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FEDL7406-02

ML7406

91/104

●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 to

[GAIN_LTOM: B1 0x0C], [GAIN_MTOH: B1 0x0F]. [GAIN_ADJ_M: B1 0x10] and [GAIN_ADJ_L: B1 0x11] registers

are used to addition values to maintain linearity when changing gain. RSSI slope can be set to [RSSI_MAG_ADJ: B1 0x13]

register so that ED value can be between 0x00(min) and 0xFF(max). Please set to these registers based on the “Initialization

table”, do not change the setting for these registers for tuning.

Adjusting the input level variation for the same input level can be set to [RSSI_ADJ: B0 0x66] register. It must compensate

the slope before compensation defined by [RSSI_MAG_ADJ:B0 0x13] 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.

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

RF input level

GAIN_ADJ_M

(B1 0x10)

ED value

GAIN_HTOM

(B1 0x0E)

high

low

RSSI value(ADC output)

Middle gain

Operation range

GAIN_MTOL

(B1 0x0C)

High gain

Operation range

GAIN_LTOM

(B1 0x0D)

GAIN_MTOH

(B1 0x0F)

GAIN_ADJ_L

(B1 0x11)

RSSI_ADJ

(B0 0x66)

RSSI_MAG_ADJ

(B1 0x13)

ML7406 Datasheet(PDF) 91 Page - LAPIS Semiconductor Co., Ltd.

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