EVBST7_03_en.pdf

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EVBST7-0 3 Evaluation board for

Microcontrollers, series ST72F26x.

User’s

manual

R

REV 1.2

Many ideas one solution

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1. Introduction

EVBST7-03-XXX is a development board designed for the hobbyists and engineers

who want to quickly prototype their system based on ST72F26x family of

microcontrollers from ST Microelectronics. Depending upon the board’s configuration

(listed versions) some or all of the following components are found on the board:

analog thermometer, potentiometer, two relays, buzzer, RTC (real time clock) and

LCD display (2x16), RS232 interface, FLASH memory, eight switches and LEDs.

Developer has access to all pins of the micro, which are brought to the header (pin

connectors) and labeled accordingly. The bard has also the large, adjacent prototype

area. The power circuitry on board (bridge, voltage regulator) eliminates the need for

an external regulated power supply. This board comes with the several examples of

the C code routines (source form), to facilitate testing and quick development in using

the board’s resources.

We wish great success and full satisfaction while designing and

constructing appliances based on EVBST7-03-XXX

2

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2. Board layout

1. Prototype area

2. Processor and additional components connector

3. LED’s and micro-switches

4. Potentiometer (may be connected to the ADC of the processor)

5. LM35 thermometer

6. RESET switch and power supply LED

7. Buzzer

8. LM317 voltage regulator

9. LCD 2x16 display (optional)

10. Power ON/OFF switch

11. Input power jack (AC/DC)

12. Relays headers

13. Programmer header

14. RS232 connector

15. RS232 – TTL converter

16. Socket for processors

17. Quartz oscillator and jumpers

18. FLASH memory, FLASH diode and jumper

19. Real time clock M41T00

20. Socket for lithium battery

21. LCD jumpers

3

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3. Supported processors

ST72260G1

ST72262G1

ST72264G2

ST72262G2

ST72264G1

FLASH

4kB

4kB

8kB

4kB

8kB

RAM

256(128)B

Peripherals

Watchdog timer,

RTC, SPI,

two 16bit timers

Watchdog timer, RTC, ADC,

SPI, two 16bit timers

Watchdog timer, RTC, ADC, SPI, SCI, IIC

two 16bit timers

Supply

voltage

2.4V – 5.5V

Clock

frequency

To 8MHz (with quartz to 16MHz) PLL 4/8MHz

Temperature

range

from -40ºC to 85ºC

from 0ºC to 70ºC

Cases

SO28 , SDIP32

LFBGA

4. Power supply for board

Recommended external power supply voltage is 7-12V AC, or 9-15V DC. A standard

power jack (bolt diameter 2.1mm - negative) is provided at the edge of the board.

Stabilized voltage Vdd is available on the double header and on the prototype area of

the board. The selection of the Vdd is provided through a 3V3 header. The default

voltage Vdd is 5VDC (no jumper on 3V3 header). By placing a jumper Vdd becomes

3.3 VDC. The SUPPLY header allows for direct access to the power jack input.

Placing a jumper bypasses the bridge and voltage regulator.

5. Peripheral circuits

5.1. LED’s

The board has 8 LED diodes, which make the simplest interface between the system

and the user. This is especially useful for the beginners, who want to manipulate or

debug their program with different hardware configurations. The diode turns on after

grounding of the associated LDn (n = 0 – 8) pin.

V dd

R

1 k

L Dn

L ED

L D1

L D2

L D3

L D4

L Dn

4

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5.2. Switches

The board is equipped with 8 micro-switches. Pressing one of them causes

grounding of the corresponding pin on the KEY header.

V d d

R

1 0 k

S W n

S n

S W

K EY

S W 1

S W 2

S W 3

S W 4

G ND

5.3. Relay

Access to the relay circuitry consists of the RELn (n=1, 2) pin of the MISC header

and pins: NC, NO, COM of the relay header. REL pin is indirectly connected to the

base of the transistor. Logic level 1 (5 or 3.3 VDC) applied to the REL pin, will

activate the relay. External circuits can be controlled via NC, NO, COM I/O pins.

Vdd

R

4 k7

Q

REL

BC 85 7

COM

D

RL1

RELAY

GND

5.4. Acoustic indicator

The board has an acoustic indicator turned on and off by the transistor. The base of

the transistor is connected to the SPK pin of the MISC header. Logic level ‘1’ (5 or

3.3 VDC) applied to the SPK pin, will activate the buzzer.

Vdd

R8

4k7

Q2

BC 557

SPK

SPK

GND

BUZER

5

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