ML7344C datasheet(96/154 Pages) LAPIS

96 / 154 page

FEDL7344C/E/J-05

ML7344C/E/J

96/154

●VCO adjustment

In order to compensate VCO operation margin, optimized capacitance compensation value should be set in

each TX/RX operation and frequency. This capacitance compensation value can be acquired by VCO

calibration.

By performing VCO calibration when power-up or reset, acquired capacitance compensation values for upper

limit and lower limit of operation frequency range (for both TX/RX), based on this value optimised capacitance

value is applied during TX/RX operation.

●VCO adjustment flow

The following flow is the procedure for acquiring capacitance compensation value when power-up or reset.

NOTE:1) VCO calibration should be performed only during IDLE state.

END

Yes

START

END

Setting low limit frequency

[VCO_CAL_MIN_I: B1 0x4D]

[VCO_CAL_MIN_FH: B1 0x4E]

[VCO_CAL_MIN_FM: B1 0x4F]

[VCO_CAL_MIN_FL: B1 0x50]

Setting operation frequency range

[VCO_CAL_MAX_N: B1 0x51]

Initialize

setting

VCO calibration completion INT. clear

INT[1] ([INT_SOURCE_GRP1: B0 0x0D])

Set VCO_CAL_START = 0b1

[VCO_CAL_START: B0 0x6F(0)]

Start

calibration

Calibration operation

Completion wait

VCO calibration completion INT?

INT[1] [INT_SOURCE_GRP1: B0 0x0D]

Yes

ML7344C Datasheet(PDF) 96 Page - LAPIS Semiconductor Co., Ltd.