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PCF8531 データシート(PDF) 39 Page - NXP Semiconductors

部品番号 PCF8531
部品情報  34 x 128 pixel matrix driver
PDF  51 Pages
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メーカー  NXP [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8531 データシート(HTML) 39 Page - NXP Semiconductors

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PCF8531
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 05 — 10 August 2010
39 of 51
NXP Semiconductors
PCF8531
34 x 128 pixel matrix driver
15. Application information
15.1 Typical system configuration
The host microprocessor/microcontroller and the PCF8531 are both connected to the
I2C-bus. The SDA and SCL lines must be connected to the positive power supply via
pull-up resistors. The internal oscillator requires no external components. The appropriate
intermediate biasing voltage for the multiplexed LCD waveforms are generated on-chip.
The only other connections required to complete the system are to the power supplies
(VDD, VSS and VLCD) and suitable capacitors for decoupling VLCD and VDD.
15.2 Power supply connections for internal VLCD generation
Fig 29. Typical system configuration
mgs483
HOST
MICROPROCESSOR/
MICROCONTROLLER
LCD PANEL
VSS1,
VSS2
VSS
VDD(I2C)
VLCD
VDD1 to VDD3
VSS1, VSS2
SDA
SCL
PCF8531
Rpu
Rpu
RES
128 column drivers
34 row drivers
Fig 30. Recommended VDD connections for internal VLCD generation
VDD1
VDD2
VDD3
VSS1
VSS2
GND
1.8 V (1.9 V) to 5.5 V
2.5 V to 4.5 V
013aaa354
1
μF
1
μF
VDD1
VDD2
VDD3
VSS1
VSS2
GND
2.5 V to 4.5 V
013aaa355
1
μF



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