ST52T430 datasheet(12/88 Pages) STMICROELECTRONICS

12 / 88 page

ST52T430/E430

12/88

1.3 Pin Description

VDD, VSS, VDDA, GNDA, VPP. In order to avoid

noise disturbances, the power supply of the digital

part is kept separate from the power supply of the

analog part.

VDD. Main Power Supply Voltage (5V± 10%).

VSS. Digital circuit ground.

VDDA. Analog VDD of the Analog to Digital

Converter.

GNDA. Analog VSS of the Analog to Digital

Converter. Must be tied to VSS.

VPP. Main Power Supply for internal EPROM

(12.5V

±5%, in programming phase) and MODE

s e l e c t or . D u r i n g t h e P r og ra m m i n g ph as e

(programming), VPP must be set at 12V. In the

Working phase VPP must be equal to VSS.

OSCin and OSCout. These pins are internally

connected with the on-chip oscillator circuit. A

quartz crystal or a ceramic resonator can be

connected between these two pins in order to allow

the correct operations of ST52x430 with various

stability/cost trade-off. An external clock signal can

be applied to OSCin, in this case OSCout must be

floating.

RESET. This signal is used to restart ST52x430 at

the beginning of its program. It also allows one to

select the program mode for EPROM.

Ain0-Ain8. These 8 lines are connected to the

input of the analog multiplexer. They allow the

ac q u i s i t i o n o f 8 an al og i n pu t . D u r i n g t h e

Programming phase, Ain0, Ain1, Ain2 and Ain3 are

used to manage EPROM operation.

PA0-PA7, PB0-PB7, PC0-PC7. These lines are

organized as I/O port. Each pin can be configured

as input or output. PA7/PB7 are tied to the same

output. During Programming phase PA port is used

for EPROM read/write data.

T0RES, T0CLK, T0STRT. These pins are related

with the internal Programmable Timer/PWM 0.

This Timer can be reset externally by using

T0RES. In Working Mode, T0RES resets the

address counter of the Timer. T0RES is active at

low level.

The Timer 0 Clock can be the internal clock or can

be supplied externally by using pin T0CLK.

An external Start/Stop signal can be used to

control the Timer through T0STRT pin.

T0OUT, T1OUT, T2OUT. The TIMER/PWM

outputs are available on these pins.

T0OUT, T1OUT , T2OUT . The TIMER/PWM

complementary outputs are available on these

pins.

Tx. Serial data output of SCI transmitter block

Rx. Serial data input of the SCI receiver block.

TEST. During the Programming and Working

phase it must be set to Vss.

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