PCF2119X_10 Datasheet, PDF (56/83 Pages) NXP Semiconductors – LCD controllers/drivers Single-chip LCD controller and driver

NXP Semiconductors
PCF2119x
LCD controllers/drivers
16.3 Power supply connections for external V_LCD generation
1.5 V to 5.5 V
2.2 V to 4.0 V
GND
V_DD1
V_DD2
V_DD3
V_SS1
V_SS2
013aaa114
2.2 V to 4.0 V
GND
V_DD1
V_DD2
V_DD3
V_SS1
V_SS2
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Drawings are showing alternative circuits.
Decoupling capacitors are not shown in the drawings.
Fig 40. Recommended V_DD connections for external V_LCD generation
V_LCDIN
V_LCD(ext)
n.c. V_LCDOUT
V_SS2
V_LCDSENSE
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The value of the capacitor should be at least 100 nF.
Fig 41. Recommended V_LCD connections for external V_LCD generation
Remark: When using an external V_LCD, the internal V_LCD generator must never be
switched on and direct mode must be avoided otherwise damages will occur.
16.4 Information about V_LCD connections
V_LCDIN — This input is used for generating the 5 LCD bias levels. It is the power supply for
the bias level buffers.
V_LCDOUT — This is the V_LCD output if V_LCD is generated internally. In this case pin V_LCDOUT
must be connected to V_LCDIN and to V_LCDSENSE. If V_LCD is generated externally, V_LCDOUT
must be left unconnected.
V_LCDSENSE — This input is used for the voltage multiplier’s regulation circuitry. When
using the internal V_LCD generation, this pin must be connected to V_LCDOUT and V_LCDIN.
When using an external V_LCD supply it must be connected to V_LCDIN only.
16.5 Reducing current consumption
Reducing current consumption can be achieved by one of the options given in Table 37.
When V_LCD lies outside the V_DD range and must be generated, it is usually more efficient
to use the on-chip V_LCD generator than an external regulator.
PCF2119X
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 15 November 2010
© NXP B.V. 2010. All rights reserved.
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