UPD16682 datasheet(23/31 Pages) NEC

23 / 31 page

Data Sheet S13368EJ3V0DS00

µµµµ PD16682

Rb/Ra is an on-chip resistance factor used for the VLC1 voltage regulator. This factor can be controlled among

eight levels using the VLC1 voltage regulator resistance factor set command. Table 10

−5 lists reference values for

(1+Rb/Ra) which are set when 3-bit data is set to the VLC1 voltage regulator resistance factor register.

Table 10

−−−−5. Reference Values for (1 + Rb/Ra)

Reference Value

3.5

4.0

4.5

5.0

5.5

6.0

6.5

7.0

10.3.2 When using external resistor (not using on-chip resistor for VLC1 voltage regulator)

Instead of using the on-chip resistor for the VLC1 voltage regulator (IRS pin = L), resistors (Ra’ and Rb’) can be

added between VSS and VR and between VR and VLC1 to set the LCD power supply voltage VLC1. In such cases, the

electronic volume function can be used to control the LCD power supply voltage VLC1 using commands to regulate

the darkness of the LCD contents. The VLC1 voltage can be determined using equation 10

−2 as within the range of

VLC1 < VLCD.

Equation 10

−−−−2.

)

(

The equation for determining VEV varies according to the product code (temperature gradient).

REG

)

162

(

203

162

−

(-001 code, –0.05 % /

°C)

REG

)

162

(

178

162

−

(-002 code, –0.1 % /

°C)

REG

)

162

(

221

162

−

(-003 code, –0.15 % /

°C)

REG

)

162

(

−

(-004 code, 0 % /

°C)

Ra'

Rb'

VLC1

–

VLC1

VEV (Constant voltage source + electronic volume)

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