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Electrical Characteristics

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Operating Temperature Range

Absolute Max

-20

-

+70

⁰C

Storage Temperature Range

Absolute Max

-30

-

+80

⁰C

Supply Voltage

-

3.0

3.3

3.6

V

Supply Current

-

40

-

mA

“H” Level Input

-

2.0

-

-

V

“L” Level Input

-

-

-

0.8

V

“H” Level Output

-

-

-

V

“L” Level Output

-

-

-

0.4

V

Supply Voltage for LED Backlight Driver

-

2.8

3.3

5.5

V

Supply Current for LED Backlight Driver

-

130

-

mA

-

85

-

mA

Backlight PWM Frequency

-

250

-

1000

Hz

Optical Characteristics

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Optimal

Viewing

Angles

Top

ϕY+

CR ≥ 10

-

60

-

⁰

Bottom

ϕY-

-

40

-

⁰

Left

θX-

-

60

-

⁰

Right

θX+

-

60

-

⁰

Contrast Ratio

CR

-

200

350

-

-

Luminance

-

250

320

-

Response Time

Rise

-

25

40

ms

Fall

-

25

40

ms

Touch Panel Characteristics

Item

Min.

Typ.

Max.

Unit

Linearity

-

-

1.5

%

Transmittance

75

-

-

%

Activation Force

70

-

120

g

Pen Writing Durability

100,000

-

-

Characters

Pitting Durability

1,000,000

-

-

Touches

Surface Hardness

3

-

-

H

Haze

-

7

-

%

Backlight Driver Configuration

The Backlight Driver Enable signal is connected to the FT81x backlight control pin. This signal is controlled by two

registers: REG_PWM_HZ and REG_PWM_DUTY. REG_PWM_HZ specifies the PWM output frequency – the range

available on the FT81x is 250 to 10000Hz, however the on-board backlight driver’s max PWM frequency is 1000Hz.

Therefore, for proper use of the PWM function available on this module, the PWM frequency should not exceed 1000Hz.

REG_PWM_DUTY specifies the duty cycle – the range is 0 to 128. A value of 0 turns the backlight completely off, while a

value of 128 provides maximum backlight brightness.

For the above register definitions, please refer to pages 80-81 of the official FT81x Series Programmers Guide:

http://www.ftdichip.com/Support/Documents/ProgramGuides/FT81X_Series_Programmer_Guide.pdf