AN3260

Prerequisites

Doc ID 17836 Rev 1

5/24

1

Prerequisites

The material required to run the STM8S-DISCOVERY thermometer demonstration

application is the following:

G

A terminal window running on a PC: the terminal emulator software can be Windows

G

An RS232 null-modem cable (transmit and receive line crosslinked)

G

USB type-A to mini-B cable.

2

Configuring the application

voltage.

3

Application description

3.1

Hardware required

This application uses the STM8S-DISCOVERY on-board LED (LD1) together with its

associated resistor (R1).

In addition, the application makes use of a 5 V powered ST232C RS232 driver/receiver. This

extra component is essential since the COM port of the PC operates from a nominal 12 V

power supply which is not compatible with the STM8S UART input/output operating at 5 V.

This component is available in an SO16 package which fits the STM8S-Discovery footprint.

packaged devices.

Table 1.

List of passive components

Component name

Value

Comments

R2

2.2 kΩ

Pull-up resistor

R3, R4 (optional)

100 Ω

Current limitation resistors

C6, C7

100 nF

Debounce filters

Button1

-

Standard pushbutton

Button2

-

Standard pushbutton

C2, C3

100 nF

Charge-pump capacitors

C1, C4

100 nF

Output capacitors

C5

100 nF

Decoupling capacitor