HT1621 datasheet(4/14 Pages) ARTSCHIP

4 / 14 page

HT1621

www.artschip.com

A.C. Characteristics

Ta=25℃

Test Conditions

Symbol

Parameter

VDD

Conditions

Min.

Typ.

Max.

Unit

fSYS1

System clock

—

On-chip RC oscillator

—

256

—

kHz

fSYS2

System clock

—

Crystal oscillator

—

32.768

—

kHz

fSYS3

System clock

—

External clock source

—

256

—

kHz

—

On-chip RC oscillator

—

fSYS1/1024

—

Crystal oscillator

—

fSYS2/128

—

fLCD

LCD Clock

—

External clock source

—

fSYS3/1024

—

tCOM

LCD Common Period

—

n: Number of COM

—

n/ fLCD

—

150

kHz

fCLK1

Serial Data Clock (

pin)

Duty cycle 50%

—

300

kHz

—

kHz

fCLK2

Serial Data Clock (

pin)

Duty cycle 50%

—

150

kHz

fTONE

Tone Frequency

—

On-chip RC oscillator

—

2.0 or 4.0

—

kHz

tCS

Serial Interface Reset Pulse

Width (Figure 3)

—

250

—

Write mode

3.34

—

125

Read mode

6.67

—

µs

Write mode

1.67

—

125

tCLK

Input Pulse Width

(Figure 1)

Read mode

3.34

—

µs

tr, tf

Rise/Fall Time Serial Data

Clock Width (Figure 1)

—

120

—

tau

Setup Time for DATA to

Clock Width (Figure 2)

—

120

—

Hold Time for DATA to

Clock Width (Figure 2)

—

120

—

tau1

Setup Time for

Clock Width (Figure 3)

—

100

—

th1

Hold Time for

Clock Width (Figure 2)

—

100

—

Figure 1

Figure 2

Figure 3

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