PCF8531U/2DA/1 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'PCF8531U/2DA/1' PDF : 51 Pages View PDF
NXP Semiconductors
PCF8531
34 x 128 pixel matrix driver
VLCDIN
1 μF
VSS2
VLCDOUT
VLCDSENSE
013aaa356
Fig 31. Recommended VLCD connections for internal VLCD generation
15.3 Power supply connections for external VLCD generation
1.8 V (1.9 V) to 5.5 V
1 μF
VDD1
VLCDIN
4.0 V to 9.0 V VLCDIN
GND
VDD2
VDD3
VSS1
VSS2
4.0 V to 9.0 V
n.c. VLCDOUT
or
1 μF
VLCDSENSE
n.c. VLCDOUT
VLCDSENSE
013aaa358
Remark: When using an external VLCD, the internal VLCD generator must never be switched on
otherwise damages will occur.
Fig 32. Recommended VDD connections for external VLCD generation
15.4 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. It is the output of the
charge pump. In this case pin VLCDOUT must be connected to VLCDIN and to VLCDSENSE
(see Figure 31). VLCDOUT must be left open circuit when VLCD is supplied from an external
source (see Figure 32).
VLCDSENSE — When using the internal VLCD generation, this pin must be connected to
VLCDOUT and VLCDIN (see Figure 31). When using an external VLCD supply it must be
connected to VLCDIN or to ground (see Figure 32).
PCF8531
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 16 May 2011
© NXP B.V. 2011. All rights reserved.
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