AN2187

3 Feature compatibility

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3

Feature compatibility

3.1

Pinout

TQFP44 or TQFP32 pin packages in all salestypes are fully pin to pin compatible. ST72F325

4).

Table 4.

Note: PWM3-0 are the Pulse Width Modulation outputs and ARTCLK is the external clock for

the 8-bit Auto reload timer. SDAI is the serial data and SCLI is the serial clock pin for the I2C

peripheral. N/A stands for not-available.

3.2

Some timing differences exist between the products (see<Blue HT>Table 5). The application

must ensure that the power supply ramps up within the time window specified for the

microcontroller.

Table 5.

VDD Rise time

3.3

Asynchronous RESET pin

The VIL/VIH of reset pin has been changed to 0.3Vdd/0.7Vdd from 0.16Vdd/0.85Vdd

respectively (see <Blue HT>Table 6).

Table 6.

RESET Pin Characteristics

ST72F325 only

TQFP44

PWM3

(pin 2)

PWM2

(pin 3)

PWM1

(pin 4)

PWM0

(pin 5)

ARTCLK

(pin 6)

SDAI

(pin 36)

SCLI

(pin 37)

TQFP32

PWM3

(pin 28)

N/A

N/A

PWM0

(pin 29)

ARTCLK

(pin 30)

SDAI

(pin 18)

SCLI

(pin 19)

Symbol

Description

Device

Conditions

Min

Max

ST72F324 / 324B

ST72F321B / 325

LVD enabled

6

µs/V

100ms/V

ST72F321

LVD enabled

6

µs/V

20ms/V

ST72F324, ST72F321

ST72F324B, ST72F321B, ST72F325

Min

Max

Min

Max

VIL

VIH