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HT9020B
Call Progress Tone Detector
Features
* Operating voltage: 2.5V~5.5V * Low power consumption * Low cost 32768Hz crystal * CPT Band: 305~640Hz detection * Good performance:
-8 ~ -39 dBm at VDD=2.5V 0 ~ -27 dBm at VDD=5V
* 8-pin DIP package
General Description
The HT9020B call progress tone detector is a telecom peripheral for Auto-dialing system use. Switched capacitors technology is implemented into the chip to get good performance characteristics of band pass filter in the range of 305 to 640Hz call progress tone which is dual tone multi-frequency signal. When it detected CPT signal then it generates relative envelopes for external microcontroller decision to finish different kinds of CPT signal detection such as dial tone, busy tone, ring-back tone and reorder tone.
Block Diagram
X1 X2
32768H z O s c illa to r
C lo c k G e n e ra to r
VRE. G e n e ra to r
VRE.
EN
S IN
B andpass . ilte r
Level S ense C K T
D ig ita l C o n tro l C K T
ENV VSS VDD
Pin Assignment
ENV VRE. 2 7 3 6 4 5 S IN VSS 1 8 VDD EN X2 X1
H T9020B 8 D IP -A
Rev. 1.20
1
March 31, 2003
HT9020B
Pin Description
Pin Name ENV VREF SIN VSS VDD EN I/O O O I 3/4 3/4 I Internal Connection CMOS OUT CMOS OUT CMOS IN 3/4 3/4 CMOS IN Description While an input signal is within specification, this pin will output the envelope relative to the input signal with a typical 40ms timing delay. 1/2 VDD reference voltage output pin When EN=VDD, the device will be turned off and VREF disabled. AC coupled analog signal input pin Negative power supply, ground Positive power supply EN=VSS; Normal operation mode EN=VDD; Device disabled. The system oscillator consists of an inverter, a bias resistor and the necessary on-chip load capacitor. Connect a standard 32.768kHz crystal or ceramic resonator. X1 and X2 terminals implement the oscillator function. The oscillator is turned off in the standby mode.
X1
I
OSCILLATOR
X2
O
OSCILLATOR
Approximate internal connection circuits
C M O S IN /O U T
V
DD
C M O S IN
CMOS OUT
V
DD
C M O S IN P u ll- lo w
X1 20p.
O S C IL L A T O R
X2 10M W 10p. EN
Absolute Maximum Ratings
Supply Voltage..............................VSS-0.3V to VDD+6V Input Voltage ............................ VSS-0.3V to VDD+0.3V Storage Temperature ............................-55C to 150C Operating Temperature ..........................-20C to 75C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
Rev. 1.20
2
March 31, 2003
HT9020B
Electrical Characteristics
Symbol VDD IDD ISTB GDV GRL fRL fRH tQI tDD tB tDH tDI tRD tST ZI VREF ZREF VIH VIL IIH IIL IOH IOL ISO Rejection Noise Time Oscillator Start-up Time Input Impedance Reference Voltage Output Impedance Logic Input High Voltage Logic Input Low Voltage Logic Input High Current Logic Input Low Current Output High Current Output Low Current Pull-down Current Parameter Operating Voltage Operating Current 2.5V No load Standby Current Detection Level Rejection Level Rejection Out-band Frequency Detection Pause Time Detection Signal Time Rejection Pause Time Envelope Output Delay Time 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 5V 5V 5V 5V 5V 5V 5V VIH=0.5V VIL=0V VOH=4.5V VOL=0.5V 3/4 2.5V Functions disabled or EN=1 5V fIN=305~640Hz Test Conditions VDD 3/4 5V Conditions 3/4 Functions enabled Min. 2.5 3/4 3/4 3/4 -36 -42 3/4 3/4 800 VSIN -50dBm, ENV=0 In-band signal input, ENV=1 VSIN -50dBm, ENV=1 Time for high output Time for low output VSIN=Any signal, ENV=0 3/4 fIN=200~3.4kHz No load 3/4 3/4 3/4 40 40 3/4 3/4 3/4 3/4 3/4 1.0 2.4 3/4 3.5 3/4 3/4 -0.1 3/4 2.0 3/4 Typ. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 40 40 3/4 0.8 3/4 2.5 10 3/4 3/4 3/4 3/4 3/4 3/4 25 Max. 5.5 2 0.8 1 0 -8 -50 200 3/4 3/4 3/4 20 3/4 3/4 20 2 3/4 2.6 20 3/4 1.5 0.1 3/4 -0.5 3/4 35 Unit V mA mA mA dBm dBm dBm Hz Hz ms ms ms ms ms ms sec MW V MW V V mA mA mA mA mA
2.5V ENV=1 All frequency, ENV=0 V0 dBm, ENV=0
Rev. 1.20
3
March 31, 2003
HT9020B
Functional Description
The HT9020B call progress tone detector can be used in world wide countries. Below is an illustration of a call progress tone frequency band, and a table of U.S.A. CPT signal is shown for user reference. Usually, HT9020B must work together with a microcontroller through software to distinguish correct cadence of CPT to fit any country CPT SPEC requirement for world wide application purposes.
Level 0dBm
C P T In -b a n d D e te c te d R e je c te d B a n d -2 7 d B m R e je c te d B a n d
-5 0 d B m
200Hz
305Hz
640Hz
800Hz
. re q u e n c y
Call progress tone frequency band illustration
U.S.A. Call Progress Tone Signal Format Tone Precision Dial Tone Old Dial Tone Precision Busy Tone Old Busy Tone Precision Reorder Tone Old Reorder Tone Precision Ring-back Tone Old Ring-back Tone Frequency 350Hz+440Hz 120Hz (or 133Hz, ..) +600Hz 480Hz+620Hz 120Hz+600Hz 480Hz+620Hz 120Hz+600Hz 440Hz+480Hz 40Hz (or the others) +420Hz Condition Continuous high Continuous high 0.5sec high and 0.5sec low 0.5sec high and 0.5sec low 0.3sec high and 0.2sec low 0.2sec high and 0.3sec low or 0.25sec high and 0.25sec low 2sec high and 4sec low 2sec high and 4sec low
Timing Diagram
EN tR
D
tB
tD
D
tQ
I
S IN tD
H
tD
L
ENV tS
T
X1,X2
Rev. 1.20
4
March 31, 2003
HT9020B
Application Circuits
V
DD
V MCU 1 2 100kW 0 .0 1 m . T IP R IN G 0 .0 1 m . 0 .1 m . ENV VDD 7 8
DD
VRE.
EN
100kW
+ -
470kW 3 20p. 4
S IN
X2 5
6 32768H z
100kW
100kW
VSS
X1
H T9020B
Rev. 1.20
5
March 31, 2003
HT9020B
Package Information
8-pin DIP (300mil) Outline Dimensions
A B 1 8 5 4
H C D E . G
a
I
Symbol A B C D E F G H I a
Dimensions in mil Min. 355 240 125 125 16 50 3/4 295 335 0 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 100 3/4 3/4 3/4 Max. 375 260 135 145 20 70 3/4 315 375 15
Rev. 1.20
6
March 31, 2003
HT9020B
Holtek Semiconductor Inc. (Headquarters) No.3, Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan Tel: 886-3-563-1999 Fax: 886-3-563-1189 http://www.holtek.com.tw Holtek Semiconductor Inc. (Sales Office) 11F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan Tel: 886-2-2782-9635 Fax: 886-2-2782-9636 Fax: 886-2-2782-7128 (International sales hotline) Holtek Semiconductor (Shanghai) Inc. 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China Tel: 021-6485-5560 Fax: 021-6485-0313 http://www.holtek.com.cn Holtek Semiconductor (Hong Kong) Ltd. Block A, 3/F, Tin On Industrial Building, 777-779 Cheung Sha Wan Rd., Kowloon, Hong Kong Tel: 852-2-745-8288 Fax: 852-2-742-8657 Holmate Semiconductor, Inc. 46712 Fremont Blvd., Fremont, CA 94538 Tel: 510-252-9880 Fax: 510-252-9885 http://www.holmate.com Copyright O 2003 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holteks products are not authorized for use as critical components in life support devices or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
Rev. 1.20
7
March 31, 2003

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