ML9058E datasheet(33/76 Pages) ETC2

33 / 76 page

FEDL9058E-01

LAPIS Semiconductor

ML9058E

33/76

VREG is a constant voltage generated inside the IC and VRS pin output voltage.

Here,

 is the electronic potentiometer function which allows one level among 64 levels to be selected by merely

setting the data in the 6-bit electronic potentiometer register. The values of

 set by the electronic potentiometer

Table 10 Relationship between electronic potentiometer register and





DB5

DB4

DB3

DB2

DB1

DB0

Rb/Ra is the voltage V1 adjustment internal resistor ratio and can be adjusted to one of 7 levels by the voltage V1

adjustment internal resistor ratio set command. The reference values of the ratio (1 + Rb/Ra) according to the 3-bit

data set in the voltage V1 adjustment internal resistor ratio setting register are listed in Table 11.

Table 11 Voltage V1 adjustment internal resistor ratio setting register values and the ratio

(1+Rb/Ra) (Nominal)

DB2

DB1

DB0

(1 + Rb/Ra)

3.0

3.5

4.0

4.5

5.0

5.5

6.0

Note: Use V1 gain in the range from 3 to 6 times. Because this LSI has temperature gradient, V1

voltage rises at lower temperatures. When using V1 gain of 6 times, adjust the built-in electronic

potentiometer so that V1 voltage does not exceed 18 V.

When V1 is set using the built-in resistance ratio, the accuracies are shown in Table 12.

Table 12 Relation between V1 Output Voltage Accuracy and V1 Gain Using Built-in Resistor

V1 gain

Parameter

3 times

3.5 times

4 times

4.5 times

5 times

5.5 times

6 times

Unit

V1 output voltage accuracy

2.5

V1 maximum output voltage

10.5

13.5

16.5

Note: The V1 maximum output voltages in Table 12 are nominal values when Tj = 25°C, and electronic

potentiometer

 = 0. The V1 output voltage accuracy in Table 12 are values when V1 load current

I = 0

A, 20 V is externally input to VOUT, and display is turned OFF.

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