PDF SM8222 Data sheet ( Hoja de datos )

Número de pieza	SM8222
Descripción	Caller ID Service IC with Call Waiting
Fabricantes	Nippon Precision Circuits Inc
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No Preview Available ! NIPPON PRECISION CIRCUITS INC. SM8222A/B Caller ID Service IC with Call Waiting OVERVIEW The SM8222A/B is a calling number identiﬁcation (caller ID) and call waiting signal (dual tone signal) receiver decoder IC that conforms with the TR- NWT-000030 and SR-TSV-002476 (Bellcore) dialer telephone number display standards. It is imple- mented in CMOS and incorporates a power-down function for low power operation. FEATURES s Conforms to TR-NWT-000030 and SR-TSV- 002476 (Bellcore) standards s Call waiting s FSK demodulator s Ring signal detect circuit built-in s High input sensitivity s Input gain adjust circuit built-in s Power-down mode s Crystal oscillator circuit built-in s Single supply operation s Microcontroller I/O interface s Molybdenum-gate CMOS process s 24-pin SOP and 24-pin DIP packages s SM8222A : 2.7 to 3.3V operation s SM8222B : 4.5 to 5.5V operation APPLICATIONS s Telephones that display dialer number before and during conversation s Adapters to display dialer number before and dur- ing conversation s Answering machines s Facsimile machines s Computer peripheral devices ORDERING INFORMATION Device SM8222AS SM8222AP SM8222BS SM8222BP Package 24-pin SOP 24-pin DIP 24-pin SOP 24-pin DIP PINOUT (Top View) TIP RING GS AGND CAP RDIN RDRC RDET MODE OSCIN OSCOUT GND 1 12 24 VDD STGT EST STD INT CDET DR DOUT DCLK FSKEN PDWN 13 IC NIPPON PRECISION CIRCUITS—1 1 page SM8222A/B DC Electrical Characteristics s SM8222A VDD = 3.0 ± 0.3 V, GND = 0 V, fCLK = 3.579545 MHz, Ta = −20 to 85 °C Parameter Current consumption Power-down current consumption LOW-level input voltage 1 HIGH-level input voltage 1 LOW-level input voltage 2 HIGH-level input voltage 2 LOW-level input voltage 3 HIGH-level input voltage 3 LOW-level output current HIGH-level output current Input leakage current Output leakage current Symbol IDD IDPD VIL1 VIH1 VIL2 VIH2 VIL3 VIH3 IOL IOH IIN IOFF Condition OSCIN = PWDN = RDIN = RDRC = MODE = 0 V, FSKEN = VDD, all other inputs open OSCIN = RDIN = RDRC = MODE = 0 V, PWDN = FSKEN = VDD, all other inputs open PWDN, MODE, FSKEN PWDN, MODE, FSKEN RDIN, RDRC RDIN, RDRC OSCIN OSCIN DOUT, EST, STD, STGT, DCLK, DR, RDET, CDET DOUT, EST, STD, STGT, DCLK, DR, RDET, CDET OSCIN, PWDN, RDIN RDRC, INT min – – – 0.7VDD – 0.7VDD – TBD 2 – −1 – Rating typ 2.5 – – – – – – – – – – – max 4.5 15 0.3VDD – 0.3VDD – TBD – – −0.8 1 1 Unit mA µA V V V V V V mA mA µA µA s SM8222B VDD = 5.0 ± 0.5 V, GND = 0 V, fCLK = 3.579545 MHz, Ta = −20 to 85 °C Parameter Current consumption Power-down current consumption LOW-level input voltage 1 HIGH-level input voltage 1 LOW-level input voltage 2 HIGH-level input voltage 2 LOW-level input voltage 3 HIGH-level input voltage 3 LOW-level output current HIGH-level output current Input leakage current Output leakage current Symbol IDD IDPD VIL1 VIH1 VIL2 VIH2 VIL3 VIH3 IOL IOH IIN IOFF Condition OSCIN = PWDN = RDIN = RDRC = MODE = 0 V, FSKEN = VDD, all other inputs open OSCIN = RDIN = RDRC = MODE = 0 V, PWDN = FSKEN = VDD, all other inputs open PWDN, MODE, FSKEN PWDN, MODE, FSKEN RDIN, RDRC RDIN, RDRC OSCIN OSCIN DOUT, EST, STD, STGT, DCLK, DR, RDET, CDET DOUT, EST, STD, STGT, DCLK, DR, RDET, CDET OSCIN, PWDN, RDIN RDRC, INT min – – – 0.7VDD – 0.7VDD – TBD 2 – −1 – Rating typ 4.5 max 8.0 Unit mA – 15 µA – 0.3VDD V ––V – 0.3VDD V ––V – TBD V ––V – – mA – −0.8 mA – 1 µA – 1 µA NIPPON PRECISION CIRCUITS—5 5 Page SM8222A/B FUNCTIONAL DESCRIPTION The SM8222A/B conforms with the SR-TSV- 002476 (Bellcore) dialer telephone number display standards. It supports the following functions. s Ring signal detection s FSK demodulation s Dual tone detection Using these functions enables systems with the fol- lowing features to be easily constructed. s Ring signal and polarity reversal signal detection s dialer telephone number display before telephone off-hook s dialer telephone number display after telephone off-hook (during conversation) Ring Signal Detection The telephone line input signals L1 and L2 pass through surge protection circuits and are input to a capacitor, resistor and diode bridge, as shown in the typical application circuit example. The signal is full-wave rectiﬁed by the diode bridge and the bridge output is level shifted by the resistor voltage divider for input to RDIN. A ring signal input on RDIN causes RDRC to become active, driving an RC time constant circuit formed by an external capacitor and resistor, before the detection signal is output on RDET. If the ring signal supplied by the inputs L1 and L2 is above the level set by the resistor divider, then the detect output RDET goes LOW. When a ring signal is detected, INT also goes LOW. FSK Demodulation The SM8222A/B incorporates an FSK demodulator to recover the dialer telephone number and other information which is sent as an FSK signal. It sup- ports two demodulator output modes to facilitate var- ious circuit design approaches. The FSK signal (Bellcore) standard is described as follows. s Modulation type: Continuous-phase binary fre- quency-shift-keying s Logic 1 data (mark): 1200 ± 12 Hz s Logic 0 data (space): 2200 ± 22 Hz s Input level (mark): −32 to −12 dBm s Input level (space): −36 to −12 dBm s Transmission speed: 1200 ± 12 baud The FSK output is controlled by the FSKEN pin. When FSKEN is HIGH, the signal pins DOUT, DCLK, DR and CDET are all HIGH. The decoded FSK signal is output on DOUT. The mode of the output timing circuit, mode 0 or mode 1, is set by the input on MODE. Mode 0 In mode 0, the received data and the clock that the data is synchronized to are both output. In addition, an output pulse occurs on DR with the same timing as each stop bit in the input data stream. Mode 1 In mode 1, DR goes LOW when data is received. From that point on, the data is read out with timing set by an external clock input on DCLK. In this mode, data can be read out at a different speed to the input data rate. Dual Tone Detection After a conversation has been initiated (after tele- phone is off-hook), the dialer telephone number ser- vice information is sent by mixing two signals, 2130 and 2750 Hz, on the line inputs L1 and L2. The SM8222A/B incorporates detectors to recover these two signals from the conversation “noise” signal. The two signals are recovered using two high-order ﬁlters with center frequencies of 2130 and 2750 Hz, respectively, in the ﬁnal stage. The SM8222A/B uses a detection circuit with time delay built-in so that detection is maintained for an input signal where the input level temporarily rises above the rated value or falls below the rated value to a level of non-detection. When the 2130 and 2750 Hz signals are simultaneously detected, EST goes HIGH and starts charging the time constant cir- cuit formed by an external capacitor and resistor. When the time constant circuit voltage STGT rises above a threshold voltage, STD goes HIGH to indi- cate the dual tone signal has been detected. When a dual tone signal is detected, INT also becomes active and goes LOW. NIPPON PRECISION CIRCUITS—11 11 Page

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