SSD1854U Ver la hoja de datos (PDF) - Solomon Systech

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SSD1854U

LCD Segment / Common Driver with Controller CMOS

Solomon Systech  

6.8 OSC1

This pin is for oscillator frequency selection. A resistor must be connected between this pin and VDD

when using the internal oscillator. The suggested value of the resistor is 680K ohm. Please refer to the

Figure 8 for details.

6.9 REF

This pin is an input pin to enable the internal reference voltage used for the internal regulator. When it

is high, an internal reference voltage source will be used. When it is low, and external reference must

be provided in VEXT.

6.10 DVDD, AVDD

Digital and Analog power supply pins, must be connected to same external source.

6.11 VDD

Internally connected to DVDD for pull high purpose. Can be connected to DVDD externally or float.

6.12 DVSS, AVSS

Digital and Analog ground, must be connected to external ground.

6.13 VSS

Internally connected to DVSS for pull low purpose.

6.14 VCI

Reference voltage input for internal DC-DC converter. The voltage of generated VCC equals to the

multiple factor (3X, 4X or 5X) times VCI with respect to VSS.

Note: Voltage at this input pin must be larger than or equal to AVDD and DVDD.

6.15 VCC

Voltage at this pin must be greater then VL4 + 2V. It can be supplied externally or generated by the

internal DC-DC converter.

When using internal DC-DC converter as generator, voltage at this pin is for internal reference only. It

CANNOT be used for driving external circuitries.

6.16 C1P, C1N, C3P, C2P, C2N, and C4P

When internal DC-DC voltage converter is used, external capacitor(s) is/are connected among these

pins.

6.17 VL7

This pin is the most positive LCD driving voltage. It can be generated by the internal regulator or

supply externally when internal regulator and divider are turned off.

6.18 VEXT

This pin is an input to provide an external voltage reference for the internal voltage regulator when

REF pin is pulled low.

6.19 VL7, VL6, VL5, VL4, VL3 and VL2

LCD driving voltages. They can be supplied externally or generated by the internal regulator and

divider or supplied externally when regulator and divider are turned off. They have the following

relationship:

VL7 > VL6 > VL5 > VL4 > VL3 > VL2 > VSS

9

SSD1854

Series

Rev 1.0

08/2002

SOLOMON

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