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ST52E301C Datasheet(PDF) 5 Page - STMicroelectronics |
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ST52E301C Datasheet(HTML) 5 Page - STMicroelectronics |
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5 / 100 page  1.2 PIN DESCRIPTION VDD, EVDD, VSS, EVSS, AVDD,AVSS, VPP. In order to avoid noise disturbances, the power supply of the digital part is kept separated from the power supply of the analog part. VDD. Main Power Supply Voltage (5V 10%). VSS. Digital circuit Ground. EVDD. EPROM Main Power Supply Voltage (5V 10%). EVSS. EPROM Digital circuit Ground. AVDD. Analog VDD of the Analog to Digital Converter. AVSS.AnalogVSS of theAnalog to DigitalConverter. Must be tied to VSS. VPP. Main Power Supply for the internal EPROM (12.5V 5%). OSCin and OSCout. These pins are internally connected with the on-chip oscillator circuit. A quar tz crystal or a ceramic resonator can be connectedbetween these two pins in order to allow the correct operations of ST52x301 with various stability/cost trade-offs. An external clock signal can be applied to OSCin, in this case OSCout must be grounded. RESET. This signal is used to restart ST52x301 at the beginningof its program.It also allows to select the program mode for the EPROM. INT. External interrupt active on rising or falling edge. AIN0-AIN3. These 4 lines are connected to the inputs of the analog multiplexer. They allow to acquire 4 analog inputs. BG. A Voltage equal to 2.5V is available on this pin. It can be used for Analog signal conditioning. P0-P7. These 8 lines are organizedas one I/O port. During the Programming phase such port is used for the EPROM data read/write. READY. Handshake signal of the parallel port. P8. Digital output. TxD. Serial data output of the SCI transmitter block. RxD. Serial data input of the SCI receiver block. TRES, TCLK, TCTRL, TIMEROUT. These pins are related with the internal Programmable Timer. The Timer can be reset externally by using TRES. In Working Mode, TRES resets the address counter of the Timer. TRES is active at low level The Timer Clock can be the internal clock or can be supplied externally by using the pin TCLK. An external Start/Stopsignal can be used to control the Timer throughthe pin TCTRL.The Timeroutput is available on the pin TIMEROUT. MAIN1, MAIN2, TRIACOUT. ST52x301 is able to drive a TRIAC in two different modes: Burst mode or Phase Angle Partialization control mode. The Burst mode is used for thermal regulation. MAIN1 and MAIN2 signals are used to detect the zero crossing of the main voltage. The pulse to drivethe TRIACis givenby TRIACOUT pin. It is possible to use the same pins to implement a PWM Driver. In this case it is possible to fix the period of PWM and to change the duty cycle on fly. The PWM output is given by TRIACOUT pin. CE, OE, ERES, CADD, VPP. These pins are used to manage the EPROM during the Programming phas e. D ur i ng t h e P r ogram m i ng ph a se (programming) VPP must be set at 12V. In the Working phase VPP must be equal to VDD. ERES in Programming Mode resets the address counter of the EPROM; it is active at high level. In the Working phase OE, CE and CADD are used like handshaking signals for the parallel port. MODE. I t s el ec ts t h e fun ct i on ment mo d e (Programming or Working mode). TEST. It enables the testing functionalities; during the Programming and Working phaseit must be set to 0. 5/99 ST52T301/E301 |
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