HT95C30P datasheet(25/50 Pages) HOLTEK

25 / 50 page

HT95C200/20P/300/30P

Rev. 0.10

October 1, 2002

Preliminary

Precaution must be taken during Burst-mode operation:

· DTMF pin will output 1/2 VDD during next burst-cycle

if the user does not initialize the TC~TR value again.

· When the burst-cycles starts, if the user clears the

BURST flag to 0 before Step 2 is finished, Step 3 and

Step 4 will be executed and after step 4 is executed,

DTMF output mode will be changed to Tone-Mode.

· When the burst-cycle starts, if the user clears the

BURST flag to 0 after Step 3 is executed, then Step 4

and Step 5 will be executed. After next Step 4 is exe-

cuted, DTMF output mode will be changed to

Tone-Mode.

· When the burst-cycles starts, if the user clears the

TONE flag to 0, DTMF output will be changed to 1/2

VDD.

· When the burst-cycle starts, if the user changes the

TC~TR value at Step1, DTMF pin output will also be

changed (determined by the new TR~TC value). The

DTMF output duration of burst-cycle is constantly

82.5ms.

· When the burst-cycle starts, if the user changes the

TC~TR value at Step2, DTMF pin still outputs 1/2

VDD. The DTMF output duration of burst-cycle is con-

stantly 85.5ms.

· If the next burst-cycle is executed continuously, Step

4 and Step 5 occur simultaneously.

1 / 2 V D D

T O N E = 1

A l l t h e t i m i n g o f t h e T O N E = 1 a n d T O N E = 0 a r e d e t e r m i n e d b y s o f t w a r e

T O N E = 0

T O N E = 1

T O N E = 0

T O N E = 1

T O N E = 0

D _ P D W N = 0 a n d B U R S T = 0

D _ P D W N = 1

DTMF Tone_mode

D _ P D W N = 1

D _ P D W N = 0

1 / 2 V D D

8 2 . 5 m s

8 5 . 5 m s

8 2 . 5 m s

8 5 . 5 m s

S t e p 1

S t e p 2

S t e p 1

S t e p 2

S t e p 1

S t e p 2

I n i t i a l N e w T C - T R T i m i n g

S t e p 3

T O N E = 1

I n i t i a l N e w T C - T R T i m i n g

T O N E = 0

T O N E = 1

S t e p 4

D T M . O n e B u r s t _ C y c l e . i n i s h e d I n t e r r u p t

B U R S T = 1

DTMF Burst_mode

Tone frequency

Output Frequency (Hz)

% Error

Specified

Actual

697

699

+0.29%

770

766

-0.52%

852

847

-0.59%

941

948

+0.74%

1209

1215

+0.50%

1336

1332

-0.30%

1477

1472

-0.34%

% Error does not contain the crystal frequency shift

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