UPD30121 datasheet(16/76 Pages) NEC

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Data Sheet U14691EJ1V0DS00

µµµµPD30121

(15) Dedicated VDD and GND signals

Signal Name

Power-Supply System

Function

VDDP

2.5 V

Dedicated VDD for the PLL analog unit

GNDP

2.5 V

Dedicated GND for the PLL analog unit

VDDPD

2.5 V

Dedicated VDD for the PLL digital unit. Its function is identical to VDD2.

GNDPD

2.5 V

Dedicated GND for the PLL digital unit. Its function is identical to GND2.

CVDD

3.3 V

Dedicated VDD for the oscillator

CGND

3.3 V

Dedicated GND for the oscillator

DVDD

3.3 V

Dedicated VDD for the D/A converter. The voltage applied to this pin

becomes the maximum of the analog output of AUDIOOUT signal.

DGND

3.3 V

Dedicated GND for D/A converter. The voltage applied to this pin

becomes the minimum of the analog output of AUDIOOUT signal.

AVDD

3.3 V

Dedicated VDD for the A/D converter. The voltage applied to this pin

becomes the maximum voltage that can be detected by the A/D interface

signals (8 lines).

AGND

3.3 V

Dedicated GND for the A/D converter. The voltage applied to this pin

becomes the minimum voltage that can be detected by the A/D interface

signals (8 lines).

PIUVDD

3.3 V

Dedicated VDD for touch-sensitive panel interface

PIUGND

3.3 V

Dedicated GND for touch-sensitive panel interface

VDD2

2.5 V

Normal 2.5-V system VDD

GND2

2.5 V

Normal 2.5-V system GND

VDD3

3.3 V

Normal 3.3-V system VDD

GND3

3.3 V

Normal 3.3-V system GND

Caution

The VR4121 has two types of power supplies. There are no restrictions as to the sequence in which

these power supplies are applied. However, do not apply one type of power for more than one

second while the other power supply is not applied.

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