ML7344J datasheet(95/151 Pages) ETC2

95 / 151 page

FEDL7344C/E/J-04

ML7344C/E/J

95/151

In actual operation, based on the 2 compensation values for each TX/RX, the most optimized capacitance value

for the frequency is calculated and applied. The calculated value is stored in [VCO_CAL: B0 0x6E].

By evaluation stage, if below values are stored in the MCU memory and uses these values upon reset or

power-up, calibration operation can be omitted.

Registers to be saved in the MCU memory.

[VCO_CAL_MIN_I: B1 0x4D]

[VCO_CAL_MIN_FH: B1 0x4E]

[VCO_CAL_MIN_FM: B1 0x4F]

[VCO_CAL_MIN_FL: B1 0x50]

[VCO_CAL_MAX_N: B1 0x51]

[TXVCAL_MIN: B1 0x52]

[TXVCAL_MAX: B1 0x53]

[RXVCAL_MIN: B1 0x54]

[RXVCAL_MAX: B1 0x55]

After issuing VCO calibration, VCO tuning voltage may be out of control range by the temperature difference

between operating timing and VCO calibration timing. If activating RF when VCO tuninng voltage is out of

control range, the margine of VCO operation will be lost and it may cause the PLL unlock. When detecting VCO

tuning voltage is out of control range, VCO calibration should be re-issued or set VCO caluibration value which

has operating margine at that temperature.

The ML7344 has the function of comparing the VCO tunign voltage with upper and lower limit voltages and

determining it is in the control range or not and indiacting the result. After detecting VCO tuning voltage is out

of contol range, it can be notified by INT[2] (group1: VCO CAL request interrupt).

[Relative controlo bit]

The comparison result with maximum threshold: VTUNE_COMP_H ([VCO_VTRSLT:B0 0x40(1)])

The comparison result with minimum threshold: VTUNE_COMP_L ([VCO_VTRSLT:B0 0x40(0)])

VCO CAL request interrupt enable setting: VTUNE_INT_ENB ([VCO_VTRSLT:B0 0x40(2)])

State control after PLL unlock detection: PLL_LD_EN ([PLL_LOCK_DETECT:B1 0x0B(7)]

[VCO voltage condition]

VTUNE_COMP_L

[VCO_VTRSLT:B0 0x40(0)]

VTUNE_COMP_H

[VCO_VTRSLT:B0 0x40(1)]

Condition

0b0

Ordinary

0b0

0b1

Out of control range

(beyond upper level)

0b1

0b0

Out of control range

(below lower level)

0b1

Extra ordinary

NOTE:

For low limit frequency, please use frequency at least 400kHz lower than operation frequency

For upper limit frequency should be selected so that operation frequency is in the frequency range.

In case of like a channel change, if the setting frequency is outside of calibration frequency range,

calibration process has to be performed again with proper frequency.

INT[2] (group1) will generate by detecting PLL unlock or VCO CAL request (when VTUNE_INT_ENB

([VCO_VTRSLT:B0 0x40(2)])=0b1). The following shows the ML7344 opereation related with LSI

state and PLL_LD_EN([PLL_LOCK_DETECT:B1 0x0B(7)]) setting, after interrupt generation.

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