PCF8820 datasheet(48/60 Pages) PHILIPS

48 / 60 page

2000 Dec 07

Philips Semiconductors

Product speciﬁcation

× 101 Grey-scale/ECB colour dot matrix

LCD driver

PCF8820

13.5

Typical system conﬁguration

The PCF8820 is a low power LCD driver designed to

interface with microcontrollers and a wide variety of LCDs.

The host microcontroller and the PCF8820 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 the power supplies (VDD1,VDD2 and VDD3) and

ground supplies (VSS1 and VSS2), LCD supply (VLCDIN) and

system reset (RES), including suitable capacitors for

decoupling.

13.6

External supply of VLCDIN

If an external LCD supply voltage is used, it must be

connected to pad VLCDIN. If pads VLCDOUT,VLCDSENSE and

VLCDIN are connected together, the impedance of

pad VLCDOUT should be set high-impedance by setting the

status of bits shown in Table 8. To obtain the highest

resistance and the lowest current into pad VLCDSENSE,itis

recommended to set the VLCD programming range to

HIGH (bit PRS = 1) and the VLCD control register value to

127 (maximum value) with bits VOP6 to VOP0.

It should be noted that VLCDIN is not allowed to be lower

than VDD1.

An external VLCD must be applied after applying VDD1, and

it must be turned off before (or when) VDD1 is turned off

(see Fig.25). It is recommended that the external VLCD is

applied after leaving the reset state. The external VLCD can

stay turned on in Power-down mode.

handbook, full pagewidth

MGT138

HOST

MICROCONTROLLER

LCD PANEL

VLCD

VP1

VP2 ≤ 5.5 V

SDA

SCL

PCF8820

Rpu

RES

101 column drivers

67 row drivers

I2C-bus

Fig.31 Typical system configuration.

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