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PCF2119DU/2/2 Datasheet(PDF) 53 Page - NXP Semiconductors

Part # PCF2119DU/2/2
Description  LCD controllers/drivers
PDF  79 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF2119DU/2/2 Datasheet(HTML) 53 Page - NXP Semiconductors

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PCF2119X_5
© NXP B.V. 2009. All rights reserved.
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)



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