HT95R64 datasheet(62/82 Pages) HOLTEK

62 / 82 page

HT95R64/HT95R65

Rev. 1.00

March 3, 2010

L B D C R e g i s t e r

b 0

L o w b a t t e r y d e t e c t i o n s w i t c h

0 : d i s a b l e

1 : e n a b l e

L o w b a t t e r y d e t e c t i o n f l a g

1 : L B I N p i n v o l t a g e i s l e s s t h a n 1 . 1 5 V

0 : L B I N p i n v o l t a g e i s n o t l e s s t h a n 1 . 1 5 V

N o t i m p l e m e n t e d , r e a d a s " 0 "

b 7

L B E N

L B F G

LBDC Register

U.S.A. Call Progress Tone Signal Format

Tone

Frequency

Condition

Precision Dial Tone

350Hz+440Hz

Continuous high

Old Dial Tone

120Hz (or 133Hz, ..) +600Hz

Continuous high

Precision Busy Tone

480Hz+620Hz

0.5sec high and 0.5sec low

Old Busy Tone

120Hz+600Hz

0.5sec high and 0.5sec low

Precision Reorder Tone

480Hz+620Hz

0.3sec high and 0.2sec low

Old Reorder Tone

120Hz+600Hz

0.2sec high and 0.3sec low or

0.25sec high and 0.25sec low

Precision Ring-back Tone

440Hz+480Hz

2sec high and 4sec low

Old Ring-back Tone

40Hz (or the others) +420Hz

2sec high and 4sec low

Timing Diagram

Low Battery Detection

The phone controller provides a circuit that detects the

LBIN pin voltage level. To enable this detection function,

the LBEN should be written as 1. Once this function is

enabled, the detection circuit needs 50us to be stable.

After that, the user could read the result from LBFG. The

low battery detect function will consume power. For

power saving, write 0 to LBEN if the low battery detec-

tion function is unnecessary.

V D E T

L B I N

L B F G

1 . 1 5 V R e f e r e n c e V o l t a g e

L B E N

R 1

R 2

The battery low threshold is determined by external R1

and R2 resistors.

1.15=

VxR2

DET

® VDET=

1.15x(R1+ R2)

If we want to detect VDET=2.4V

then 2.4V=

1.15x(R1

R2)

® R1=1.087R2

C P T S I N

C P T X 1 , C P T X 2

t R D

t B

t D D

t Q I

t D H

t D L

t S T

C P T E N

C P T E N V

HT95R64 Datasheet(PDF) 62 Page - Holtek Semiconductor Inc

HT95R64 Datasheet(HTML) 62 Page - Holtek Semiconductor Inc

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