HT95R22 datasheet(5/52 Pages) HOLTEK

5 / 52 page

A.C. Characteristics

Ta=25

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

General

fSYS1

System Clock 1

Normal mode

32768Hz crystal oscillator

3.5795

MHz

fSYS2

System Clock 2

Green mode

32768Hz crystal oscillator

kHz

tSST

System Start-up Timer Period

Power-up, Reset or wake-up

from HALT

1024

tSYS

tWAKE

Wake-up Time for 32768Hz

Crystal OSC

32kHz oscillator OFF

® ON

¾¾

200

tFUP

Settling Time for 32768Hz to

3.58MHz PLL (Frequency Up

Conversion)

32kHz oscillator is ON;

3.58MHz oscillator OFF

® ON

¾¾

tS2G

Time from Sleep Mode to

Green Mode

¾ Wake-up from Sleep Mode

MCU

tWDTOSC

Watchdog Oscillator Period

180

130

tRES

External Reset Low Pulse

Width

¾¾

tINT

Interrupt Pulse Width

¾¾

DTMF Generator (Operating Temperature:

-20°C~85°C)

fDTMFO

Single Tone Output

Frequency

2.5V

Microcontroller normal mode;

DTMF generator single tone test

mode

690

704

762

778

843

861

932

950

1197

1221

1323

1349

1462

1492

1617

1649

VTAC

DTMF Output AC Level

¾ Row group, RL=5kW

120

155

180

mVrms

DTMF Output Load

¾ T.H.D. £-23dB

¾¾

ACR

Column Pre-emphasis

¾ Row group= 0dB

THD

Tone Signal Distortion

¾ RL=5kW¾

-30

-23

HT95R22

Rev. 1.00

January 6, 2009

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