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| FEATURES * * * * * * * * Include Dialer, Speech, and Ringer Circuit in Single Chip, Replacing Two or More ICs Single Board Design Meets Multiple PTT Requirements. Operating Range From 15 to 100mA Selectable Make-Break Ratio Tone/Pulse Dialing 32 Digit Last Number Redial Ring Frequency Discrimination 2-tones Melody Generator ICM7101D is a single chip telephone CMOS integrated circuits that meets multiple PTT requirements, allowing phone manufacturers to have single board design for various countries. This reduces inventory and simplify manufacturing processes. ICM7101D integrates dialer, speech, and ringer circuits. The integration reduces component counts, hence increases product reliability. OVERVIEW TYPICAL APPLICATION CIRCUIT Rev. 2.0 ICmic reserves the right to change the specifications without prior notice 1 PACKAGE 28-Lead SOIC AGND 1 VDD 2 VDDI 3 GND 4 TXO 5 VL 6 LLC 7 FOPT0 8 MFL0 9 HS/DPB 10 OSC1 11 OSC2 12 RGD 13 MO 14 SOIC 28 STB 27 RXI 26 RXO 25 CI 24 M1 23 M2 22 R1 21 R2 20 R3 19 R4 18 C1 17 C2 16 C3 15 C4 Rev. 2.0 ICmic reserves the right to change the specifications without prior notice 2 PIN DESCRIPTION Pin No 1 2 3 4 5 Symbol AGND VDD VDDI GND TXO Description Analog Ground Supply Voltage Ground Supply Input Voltage Power for the chip is extracted from this pin Transmit Output Transmit output to be connected to external power transistor for the modulation of line voltage and for shorting the line during make period of pulse dialing. Line Voltage Line Loss Compensation 0V = No LLC; AGND=Low LLC; VDD=High LLC. Flash Option FOPT0=0 - 100ms FOPT0=1 - 600ms DTMF Level Option MFL0=0 - Low DTMF (~ -8/-10dB for ZAC=600ohm) MFL0=1 - High DTMF (~ -6/-8dB for ZAC=600ohm) Hook Switch Input and Dial Pulse Output When off-hook, this pin is pulled high by the hook switch. During pulse dialing, this pin is pulled low during break periods. Oscillator Input 3.58MHz ceramic resonator input. Oscillator Output Ring Detection Input Input for ring frequency detection. Melody Output Melody pulse output for tone ringer. Keypad Columns Keypad column inputs. Keypad Rows Keypad rows. These pins are also used to determine the operating mode. Microphone Inputs Input for electret microphone. Complex Impedance and AC Impedance Input Placing 47Kohm resistor between CI and AGND pins sets the AC impedance around 600ohm. The higher the resistor the higher the AC impedance. Lower resistor results in lower AC impedance. Receive Output These outputs drive a dynamic earpiece. Receive Input Input for received signal. Side Tone Balance Input Side tone cancellation input. 6 VL 7 LLC 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 FOPT0 MFL0 HS/DPB OSC1 OSC2 RGD MO C4 C3 C2 C1 R4 R3 R2 R1 M2 M1 CI RXO RXI STB Rev. 2.0 ICmic reserves the right to change the specifications without prior notice 3 FUNCTIONAL DESCRIPTION SYSTEM STARTUP ICM7101D generates internal power-on-reset when VDD reaches around 1.5V. Power-onreset appropriately initiates the system to a known initial state. ICM7101D stays in shutdown mode so long as HS/DPB pin stays LOW. However, the ringer circuitry is activated in this mode to monitor the incoming ringing signal. OSCILATOR All the timing of ICM7101D is based on a clock frequency of 3.58 MHz. A Crystal or Ceramic resonator of this frequency should be connected to oscilator pins of ICM7101D. Care has to be taken in selecting this components since in practise minor deviations from the nominal frequency may occur due to the characteristics of the frequency reference device used. It is recommended to connect a small value capcitors ( 47pF) in parallel with the Frequency Reference to ensure start-up and or operation at the nominal frequency. TONE RINGER The tone ringer of ICM7101D consists of Ring Detection Circuit and Melody Generator Circuit. Ring Detection Circuit Ring Detection circuit will assures the signal that present on RGD pin input is valid. The signal is considered as a valid signal if the signal has frequencies between 13Hz and 70Hz. Melody Generator Once the valid ring signal is detected on the Ring Detection (RGD) pin and is present for about 75 ms continously, the melody generator will be actived, the ring signal will be monitored continously and the melody generator will be immediately turn on or off according to the momentary presence of a valid or unvalid ring signal respectively until next power on reset or off-hook. The melody generator of ICM7101D creates 2 frequencies of 874Hz, and 1250Hz. SPEECH NETWORK The speech network of ICM7101D consists of a transmitter and a receiver path, side tone cancellation and line loss compensation. As soon as the phone goes off-hook (i.e. when HS/DPB pin goes HIGH), causing ICM7101D to activate the whole circuit except the ringer which becomes deactivated. Transmit For 600 ohm termination, the transmit gain from microphone input to the line voltage is 35dB. The output at VL pin is clamped at 2Vpp. Receive Receive path gain is 3dB for 600 ohm termination. Soft clip circuitry limits the output at RO pins to 2Vpp. This avoids unpleasant harsh distortion. Side Tone Cancellation As shown in the typical application circuit, side tone cancellation can be achieved best by balancing the Whitestone bridge of R2, R3, R4+R5//C5, and line impedance. Line Loss Compensation LLC input level is scanned as the phone goes off-hook (i.e. as HD/DPB pin goes HIGH). At the same time, the loop current level is sensed and determined. If LLC=0, no compensation scheme is in effect. If LLC=AGND, "low" compensation scheme is in effect. Transmit and receive gains are reduced by as much as 6dB when the loop current exceeds 50mA. If LLC=VDD, "high" compensation scheme is in effect. Transmit and receive gains are reduced by as much as 6dB when the loop current exceeds 75mA. AC Impedance Placing 47Kohm resistor between CI and AGND pins sets the AC Impedance to be about 600ohm. Increasing the resistor value increases the impedance. Similarly, lowering the resistor value will lower the impedance. Rev. 2.0 ICmic reserves the right to change the specifications without prior notice 4 DTMF Level When the AC Impedance is set to 600ohm, DTMF Level is determined by MFL0 pin as follow: MFL0 0 1 DTMF Level -8/-10 dB -6/-8 dB Last Number Redial (LNR) The last Number Redial (LNR) is a facility of ICM7101D to allow resignalling of the last manually dialled number without keying in all digits again. The LNR is repeatable after each off-hook. A manually entered number is stored in a RAM of ICM7101D. The capacity of RAM is 32 digits. Flash ICM7101D assert line break (pull down HS/DPB pin) when Flash key is depressed. The flash duration depends on the FOPT0 as follow: FOPT0 0 1 Flash Duration 100 ms 600 ms DIALING FUNCTIONS Keypad arrangement is as shown in the typical application circuit in Figure 1. Dialing modes are selectable using the pull-up/pull-down resistors connected to the row inputs. As soon as the phone goes off-hook (i.e when HS/DPB pin goes HIGH), voltage levels on keypad row inputs (R1 thru R4) are first scanned to determine the operating mode as follow: Pin R1 R2 R3 R4 Function Dialing Mode LD Period Make/Break Ratio DTMF option Level - Mode 0 - MF mode 1 - LD mode 0 - 10 PPS 1 - 20 PPS 0 - 33/67 1 - 40/60 0 - 82ms/82ms 1 - 82ms/160ms Mute ICM7101D turns off the microphone input from M1 and M2 pins when Mute key is depressed. Depressing the key again toggle the mute function. Pause ICM7101D pauses (no dialing and microphone is muted) for 2.2 seconds when Pause key is depressed. Valid Keys ICM7101D has a total of 15 valid keys. It scans the keys by asserting known state on pins R1, R2, R3, and R4 in sequence, and check which column (pins C1, C2, C3, C4) is shorted to which row. The following specify the combinations: R1 R2 R3 R4 C1 1 4 7 * C2 2 5 8 0 C3 3 6 9 # C4 Pause Mute Flash LNR DTMF Tones The DTMF Tone Generator creates 12 tones in compliance with CCITT Recommendation. There are two group of frequencies of DTMF tones. The low group depends on the key's row, while the high group depends on the key's column as illustrated in the following table: R1 R2 R3 R4 High Freq Rev. 2.0 C1 1 4 7 * 1209 Hz C2 2 5 8 0 1336 Hz C3 3 6 9 # 1477 Hz Low Freq 697 Hz 770 Hz 852 Hz 941 Hz ICmic reserves the right to change the specifications without prior notice 5 ABSOLUTE MAXIMUM RATING Symbol VDDI VIN_ TSTG TSOL Parameter Supply Line Voltage Digital Input Voltage Storage Temperature Soldering Temperature Value -0.3 to 7.0 -0.3 to 7.0 -55 to +150 300 Unit V V o C o C Note 1: Stress greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. OPERATING RANGE Range Commercial o Ambient Temperature -25 C to 70 C o ELECTRICAL CHARACTERISTICS (ILINE = 15mA unless otherwise specified) Symbol VLI IDD IOL Parameter Line Voltage (default) Operating Current Test Conditions ILINE: 13mA to 100mA Speech mode Tone Dialing Pulse Dialing VDD = 2.5V Ring mode VDD = 2.5V VOL = 0.4V HS/DPB, RGD TA=25 C o HS/DPB, RGD TA=25 C o Min Typ 4.5 3 4 0.2 0.3 1.5 Max Unit V mA mA mA mA mA Output Current, Sink TXD, HS/DPB, MO VIL Input Voltage Low VIH Input Voltage High Transmit (TX) GTX Transmit Gain THD Distortion VAGC Soft Clip Level ZIN Input Impedance GMUTE Mute Attenuation VIN MAX Input Voltage Range Receive (RX) GRX Receive Gain THD Distortion VAGC Soft Clip Level ZIN Input Impedance (RI) VIN RI Input Voltage Range Output Driver (BJT) VIN MAX Input Voltage Range VTX Dynamic Range RL Return Loss Side Tone (ST) GST Side Tone Cancellation VIN ST Input Voltage Range VSS 0.7 34 35 2 20 +/- 1 +/- 0.5 0.3 1 36 2 VDD VDD dB % Vpp K dB Vpp Vpp dB % Vpp K VPEAK VPEAK VPEAK dB dB VPEAK VIL < 0.5 VRMS Mute activated Differential Single Ended VRXI < 0.5 VRMS 60 2 3 2 8 +/- 2 +/- 2 +/- 2 6 2 ZRL= 1000 18 26 +/- 2 Rev. 2.0 ICmic reserves the right to change the specifications without prior notice 6 Keyboard tD Key debounce time HS/DPB INPUT tHS-L Low to High Debounce tHS-H High to Low Debounce Tone Ringer VMO Melody Output tMD Melody Delay F1 Frequency 1 F2 Frequency 2 tDT Detection Time Min. Detection fMIN Frequency Max. Detection fMAX Frequency DTMF F Frequency Deviation tTD Tone Duration tITP Inter Tone Pause 64 Going off-hook Going on-hook 15 15 PDM 874 1250 10 80 ms ms ms ms Hz Hz ms Hz 70 Hz % Ring Freq = 20Hz 50 13 note 5 note 1 note 1 -0.31 80 80 82 82 +0.75 84 84 ms ms Note 1: The values are valid during automatic dialing and are minimum values during manual dialing, i.e. the tones will continue as long as the key is depressed. Note 3: Relative to high group Note 5: This does not include the frequency deviation of the ceramic resonator. Rev. 2.0 ICmic reserves the right to change the specifications without prior notice 7 APPENDIX A: TYPICAL APPLICATION CIRCUIT Rev. 2.0 ICmic reserves the right to change the specifications without prior notice 8 PACKAGE INFORMATION 28-Lead SOIC (Unit: Inches) Rev. 2.0 ICmic reserves the right to change the specifications without prior notice 9 Rev. 2.0 ICmic reserves the right to change the specifications without prior notice 10 The information contained herein is current as of the date of publication; however, delivery of this document shall not under any circumstances create any implication that the information contained herein is correct as of any time subsequent to such date. ICmic reserves the right to make changes without notification, even if such changes would render information contained herein inaccurate or incomplete. ICmic makes no representation or warranty that any circuit designed by reference to the information contained herein, will function without errors and as intended by the designer. DISCLAIMER Rev. 2.0 ICmic reserves the right to change the specifications without prior notice 11 |
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