ST52T400 datasheet(18/94 Pages) STMICROELECTRONICS

18 / 94 page

ST52T400/T440/E440/T441

18/94

1.3 Pin Description

ST52x400/440/441 pins can be set in digital input

mode, digital output mode or in Alternate Func-

tions. The pin configuration is achieved by means

of the configuration registers. The functions of the

ST52x400/440/441 pins are described below:

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

VSS. Digital circuit Ground. All Vss pins must be

connected to ground (see ST52T400 pin-out).

GNDA. Analog circuit ground of the Analog Com-

parator. Must be tied to VSS.

VPP. Main Power Supply for internal EPROM pro-

gramming and MODE selector. During the Pro-

gramming phase VPP must be set at 12V. In the

Working phase VPP must be equal to VSS.

OSCin and OSCout. These pins are internally

connected to the on-chip oscillator circuit. A quartz

crystal or a ceramic resonator can be connected

between these two pins in order to allow the cor-

rect operations of ST52x400/440/441 with various

stability/cost trade-offs. An external clock signal

canbeapplied toOSCin: inthis caseOSCout

must be grounded.

RESET.

This

signal

used

reset

the

ST52x400/440/441 and re-initialize the registers

and control signals. It also allows the user to

select the working mode of the device.

PA0-PA7, PB0-PB7,PC0-PC4. These lines are

organized as I/O ports. Each pin can be config-

ured as an input or output. During the Program-

ming phase the ports are used for EPROM data

read/write operations.

AC0-AC5(*).

These pins are used to input the

analog signals to the Analog Comparator. An ana-

log multiplexer is available to switch these inputs

to the Analog Comparator.

CS(*). This pin outputs the current generated in

the Analog Comparator peripheral by a current

generator, allowing charging of an external capac-

itor to obtain a voltage ramp for the A/D conver-

sion.

ACSTRT, ACSYNC(*). These pins are used to

synchronize the 16-bit counter of the Analog Com-

parator with an external ramp generator. The

ACSTRT input is used to start the counter. The

ACSYNC output is set when the counter is ready

to start a new count.

BG(*). A Bandgap Reference value of 2.5V is

available on this pin. It can be used for analog sig-

nal conditioning.

TOUT, TOUTN.These pins output the signal gen-

erated by the TIMER peripheral. The T0OUTN

signal is the complement of the T0OUT one.

TRES, TSTRT, TCLK . These pins are related to

the TIMER peripheral and are used for Input Cap-

ture and event counting. The TRES pin is used to

set/reset the Timer; the TSTRT pin is used to start/

stop the counter. The Timer can be driven by the

internal clock or by an external signal connected

to the TCLK pin.

TROUT, MAIN1, MAIN2. These pins are related to

the TRIAC DRIVER peripheral. TROUT outputs

the signal generated by the peripheral. In order to

drive a TRIAC directly without the use of addi-

tional components, the TROUT pin can supply up

to 50 mA (2V voltage drop). MAIN1 and MAIN2

pins are used to detect the zero crossing of the

Power Line voltage.

(*) Not available in ST52x400 devices

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