ST52T301 datasheet(5/100 Pages) STMICROELECTRONICS

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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.

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ST52T301/E301

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