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ST75C520PQFP Scheda tecnica(PDF) 4 Page - STMicroelectronics |
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ST75C520PQFP Scheda tecnica(HTML) 4 Page - STMicroelectronics |
4 / 45 page I.3 - Analog Interface Pin Name Type Description TXA1 O Transmit Analog Output 1 TXA2 O Transmit Analog Output 2. Outputs TXA1 and TXA2 provide analog signals with maximum peak to peak amplitude 2 x VREF, and must be followed by an external continous-time two pole smoothing filter (where VREF =VREFP -VREFN). RXA1 I Receive Analog Input 1 RXA2 I Receive Analog Input 2. The analog differential input peak to peak signal must be less than 2 x VREF.It must be preceded by an external continous-time single pole anti-aliasing filter. This filter must be as close as possible to the RXA1 and RXA2 Pins (where VREF =VREFP -VREFN). VCM I/O Analog Common Voltage (nominal +2.5V). This input must be decoupled with respect to AGND. VREFN I Analog Negative Reference (nominal VCM - 1.25V). This input must be decoupled with respect to VCM. VREFP I Analog Positive Reference (nominal VCM+1.25V). This input must be decoupled with respect to VCM. I.4 - V.24 Interface Pin Name Type Description RTS I Request to Send. Active low. CLK O Data Bit Clock. Falling edge coïncides with DATA change. CTS O Clear to Send. Active low. RxD O Receive Data TxD I Transmit Data sampled with rising edge of CLK CD O Carrier Detect. Active low. I.5 - Miscellaneous Pin Name Type Description XTAL O Internal Oscillator Output. Left open if not used. EXTAL I Internal Oscillator Input, or External Clock EYEX O Constellation X analog coordinate EYEY O Constellation Y analog coordinate TEST1 To be left open TEST2 To be left open Note : The nominal external clock frequency of the ST75C520 is 29.4912MHz with a precision better than ± 5.10-5 I.6 - Boundary Scan Interface A set of 13 signals are dedicated for Testing the ST75C520 Component. These signals can be used in a development phase, associated with the SGS-THOMSON ST18932 Boundary Scan Development Tools, to Debug the application Hardware and Software. If not used all input signals must be grounded and all output signals left open. Pin Name Type Description SCIN I Scan Data Input SCCLK I Scan Clock SCOUT O Scan Data Output BOS I Begin of Scan Control EOS I End of Scan MC0..MC2 I Mode Control HALT I Stop ST75C520 Execution MCI O Multicycle Instruction RDYS O Ready to Scan Flag EBS I Enable Boundary Scan. Active low (must be set low in normal mode). CLKOUT O Internal ST75C520 Clock (XTAL frequency divided by 2) ST75C520 4/45 |
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