ST72324BJ2 datasheet(159/188 Pages) STMICROELECTRONICS

Part #	ST72324BJ2

Description	8-bit MCU, 3.8 to 5.5 V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI

PDF	188 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

159 / 188 page

ST72324B

Electrical characteristics

159/188

RESET pin protection when LVD is disabled

When the LVD is disabled, it is recommended to protect the RESET pin as shown in

Figure 79 and follow these guidelines:

The reset network protects the device against parasitic resets.

The output of the external reset circuit must have an open-drain output to drive the ST7

reset pad. Otherwise the device can be damaged when the ST7 generates an internal

reset (LVD or watchdog).

Whatever the reset source is (internal or external), the user must ensure that the level

on the RESET pin can go below the VIL max. level specified in Section 12.10.1.

Otherwise the reset will not be taken into account internally.

Because the reset circuit is designed to allow the internal RESET to be output in the

RESET pin, the user must ensure that the current sunk on the RESET pin (by an

external pull-up for example) is less than the absolute maximum value specified for

IINJ(RESET) in Section 12.2.2 on page 138.

Figure 79.

RESET pin protection when LVD is disabled

0.01µF

external

reset

circuit

User

Required

ST72XXX

Pulse

generator

Filter

RON

VDD

Watchdog

Internal

reset

VDD

4.7k

Ω

ST72324BJ2 Datasheet(PDF) 159 Page - STMicroelectronics