D.C. Characteristics

Ta=25

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Conditions

Operating Voltage

¾¾

2.4

¾

3.3

V

Operating Current

3V

See note 1

¾

23

mA

Standby Current

3V

See note 2

¾¾

1

mA

Input Low Voltage

3V

DATA, WR,CS,RD

¾¾

0.6

V

Input High Voltage

3V

DATA, WR,CS,RD

2.4

¾

3.0

V

DATA, BZ, BZ, IRQ

3V

0.8

1.6

¾

mA

DATA, BZ, BZ

3V

-0.6

-1.2

¾

mA

LCD Common Sink Current

3V

80

150

¾mA

LCD Common Source Current

3V

-70

-120

¾mA

LCD Segment Sink Current

3V

70

140

¾mA

LCD Segment Source Current

3V

-30

-60

¾mA

Pull-high Resister

3V

DATA, WR,CS,RD

100

200

300

k

W

Note:

1. No load, Buzzer Off, LCD On, system enable and CS=WR=RD=High

2. No load, Buzzer Off, LCD Off, system disable and CS=WR=RD=High

A.C. Characteristics

Ta=25

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Conditions

System Clock

3V

Crystal 32kHz

¾

32768

¾

Hz

LCD Frame Frequency

¾

Crystal 32kHz

¾

64

¾

Hz

LCD Frame Frequency 1/2 Duty

¾¾

64

¾

Hz

LCD Frame Frequency 1/3 Duty

¾¾

56

¾

Hz

LCD Frame Frequency 1/4 Duty

¾¾

64

¾

Hz

LCD Common Period

¾

n: Number of COM

¾

¾

s

Serial Data Clock

3V

Write mode

4

¾

150

kHz

Read mode

¾¾

75

kHz

Tone Frequency (2kHz)

3V

Crystal 32kHz

¾

2.0

¾

kHz

Tone Frequency (4kHz)

¾

4.0

¾

kHz

Serial Interface Reset Pulse

Width

(Figure 3)

¾

CS

500

600

¾

ns

WR,RD Input Pulse Width

(Figure 1)

3V

Write mode

3.34

¾

125

ms

Read mode

6.67

¾¾

Rise/Fall Time Serial Data Clock

Width

(Figure 1)

3V

¾¾

120

160

ns

Setup Time for DATA to WR,RD

Clock Width

(Figure 2)

3V

¾

60

120

¾

ns

Hold Time for DATA to WR,RD

Clock Width

(Figure 2)

3V

¾

500

600

¾

ns

HT1620

Rev. 1.80

6

July 27, 2009

PATENTED