PCF2119RUSLASH2SLASHF2 datasheet(53/79 Pages) NXP

53 / 79 page

PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

53 of 79

NXP Semiconductors

PCF2119x

LCD controllers/drivers

16.3 Power supply connections for external VLCD generation

16.4 Information about VLCD connections

VLCDIN — This input is used for generating the 5 LCD bias levels. It is the power supply for

the bias level buffers.

VLCDOUT — This is the VLCD output if VLCD is generated internally. In this case pin VLCDOUT

must be connected to VLCDIN and to VLCDSENSE.

VLCDSENSE — This input is used for the voltage multiplier’s regulation circuitry. When using

the internal VLCD generation, this pin must be connected to VLCDOUT and VLCDIN. When

using an external VLCD supply it must be connected to VLCDIN only.

16.5 Reducing current consumption

Reducing current consumption can be achieved by one of the options given in Table 37.

When VLCD lies outside the VDD range and must be generated, it is usually more efﬁcient

to use the on-chip VLCD generator than an external regulator.

Decoupling capacitors are not shown in the drawings.

Remark: When using an external VLCD, the internal VLCD generator must never be switched on

otherwise damages will occur.

Fig 39. Recommended VDD connections for external VLCD generation

Fig 40. Recommended VLCD connections for external VLCD generation

VDD1

VDD2

VDD3

VSS1

VSS2

GND

1.5 V to 5.5 V

2.2 V to 4.0 V

013aaa114

GND

013aaa117

VDD1

VDD2

VDD3

VSS1

VSS2

2.2 V to 4.0 V

013aaa118

VSS2

VLCDIN

VLCDOUT

VLCDSENSE

n.c.

Table 37.

Reducing current consumption

Original mode

Alternative mode

character mode

icon mode (control bit IM)

display on

display off (control bit D)

VLCD generator operating

direct mode

any mode

power-down mode (pin PD)

PCF2119RU/2/F2 Folha de dados(PDF) 53 Page - NXP Semiconductors

PCF2119RU/2/F2 Folha de dados(HTML) 53 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79

Folha de dados Download

Ligação URL