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PCD3312C Datasheet(PDF) 6 Page - NXP Semiconductors |
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PCD3312C Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 28 page  1996 Nov 21 6 Philips Semiconductors Product specification DTMF/modem/musical-tone generators PCD3311C; PCD3312C 7 FUNCTIONAL DESCRIPTION 7.1 General (see Fig.1) The Input Control Logic decodes the input data to determine whether DTMF, modem or musical tones are selected; and which particular tone or combination of tones is required. A code representing the required tones is sent to the Divider Selection ROM which selects the correct division ratio in both of the Frequency Dividers (or in one divider, if only a single tone is required). The Oscillator circuit provides a square wave of frequency 3.58 MHz. Each Frequency Divider divides the frequency of the Oscillator to give a serial digital square wave with a frequency simply related to that of the required tone. The output from each Frequency Divider goes to a DAC, which is also fed by a clock derived from the oscillator. Using these two signals, the DAC produces an approximate sine wave of the required frequency, with an amplitude derived from the Voltage Reference. The output from the DAC goes to an Adder where, for DTMF, it is combined with the output from the other DAC. The output from the Adder goes through two stages of Low Pass Filters to give a smoothed tone (single or dual), and finally to the TONE output. 7.2 Clock/oscillator connection The timebase for the PCD3311C and PCD3312C is a crystal-controlled oscillator, requiring a 3.58 MHz quartz crystal to be connected between OSCI and OSCO. Alternatively, the OSCI input can be driven from an external clock of 3.58 MHz. 7.3 Mode selection (PCD3311C) The MODE input selects the data input mode for the PCD3311C. When MODE is connected to VDD (HIGH), data can be received in the parallel mode. When connected to VSS (LOW) or left open, data can be received via the serial I2C-bus. PCD 3312C has no MODE input as data input is via the I2C-bus only. 7.4 Data inputs (PCD3311C) Inputs D0, D1, D2, D3, D4 and D5 are used in the parallel data input mode of the PCD3311C. Inputs D0 and D1 are also used in serial input mode when they act as the SCL and SDA inputs respectively. Inputs D0 and D1 have no internal pull-down or pull-up resistors and must not be left open in any application. Inputs D2, D3, D4 and D5 have internal pull-down. D4 and D5 are used to select between DTMF dual, DTMF single, modem and musical tones (see Table 1). D0, D1, D2 and D3 select the tone combination or single tone within the selected application. They also, in combination with D4, select the standby mode. See Tables 2, 3, 4 and 5. PCD 3312C has no parallel data pins as data input is via the I2C-bus. Table 1 Use of D5 and D4 to select application 7.5 Strobe input (PCD3311C ) The STROBE input (with internal pull-down) allows the loading of parallel data into D0 to D5 when MODE is HIGH. The data inputs must be stable preceding the positive-going edge of the strobe pulse (active HIGH). Input data are loaded at the negative-going edge of the strobe pulse and then the corresponding tone (or standby mode) is provided at the TONE output. The output remains unchanged until the negative-going edge of the next STROBE pulse (for new data) is received. Figure 5 is an example of the timing relationship between STROBE and the data inputs. When MODE is LOW, data is received serially via the I2C-bus. D5 D4 APPLICATION LOW LOW DTMF single tones; musical tones; standby LOW HIGH DTMF dual tones (all 16 combinations) HIGH LOW modem tones HIGH HIGH musical tones |
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Similar Description - PCD3312C |
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