RA4M1 datasheet(108/130 Pages) RENESAS

108 / 130 page

R01DS0355EJ0100 Rev.1.00

Page 108 of 130

Oct 8, 2019

RA4M1 Group

2. Electrical Characteristics

C1: A capacitor connected between CAPH and CAPL

C2: A capacitor connected between VL1 and GND

C3: A capacitor connected between VL2 and GND

C4: A capacitor connected between VL4 and GND

C1 = C2 = C3 = C4 = 0.47 μF ±30%.

Note 2.

This is the time required to wait from when the reference voltage is specified using the VLCD register (or when the internal

voltage boosting method is selected (by setting the MDSET[1:0] bits in the LCDM0 register to 01b) if the default value reference

voltage is used) until voltage boosting starts (VLCON = 1).

Note 3.

This is the wait time from when voltage boosting is started (VLCON = 1) until display is enabled (LCDON = 1).

[1/4 Bias Method]

Note 1.

This is a capacitor that is connected between voltage pins used to drive the LCD.

C1: A capacitor connected between CAPH and CAPL

C2: A capacitor connected between VL1 and GND

C3: A capacitor connected between VL2 and GND

C4: A capacitor connected between VL3 and GND

C5: A capacitor connected between VL4 and GND

C1 = C2 = C3 = C4 = C5 = 0.47 μF ± 30%

Note 2.

This is the time required to wait from when the reference voltage is specified by using the VLCD register (or when the internal

voltage boosting method is selected (by setting the MDSET1 and MDSET0 bits in the LCDM0 register to 01b) if the default

value reference voltage is used) until voltage boosting starts (VLCON = 1).

Note 3.

This is the wait time from when voltage boosting is started (VLCON = 1) until display is enabled (LCDON = 1).

Note 4.

VL4 must be 5.5 V or lower.

Table 2.65

Internal voltage boosting method LCD characteristics

Conditions: VCC = 1.8 V to 5.5 V

Parameter

Symbol Conditions

Min

Typ

Max

Unit

Test

conditions

LCD output voltage

variation range

VL1

C1 to C5*1 = 0.47 μF

VLCD = 04h

0.90

1.0

1.08

VLCD = 05h

0.95

1.05

1.13

VLCD = 06h

1.00

1.10

1.18

VLCD = 07h

1.05

1.15

1.23

VLCD = 08h

1.10

1.20

1.28

VLCD = 09h

1.15

1.25

1.33

VLCD = 0Ah

1.20

1.30

1.38

VLCD = 0Bh

1.25

1.35

1.43

VLCD = 0Ch

1.30

1.40

1.48

Doubler output voltage

VL2

C1 to C5*1 = 0.47 μF

2VL1 - 0.08

2VL1

V-

Tripler output voltage

VL3

C1 to C5*1 = 0.47 μF

3VL1 - 0.12

3VL1

V-

Quadruply output

voltage

VL4*4

C1 to C5*1 = 0.47 μF

4VL1 - 0.16

4VL1

V-

Reference voltage

setup time*2

tVL1S

--ms

Figure 2.81

LCD output voltage

variation range*3

tVLWT

C1 to C5*1 = 0.47 μF

500

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