Mais Dispositivos I2C
Implementei junto ao programa de edição de memórias EEPROM com utilização da placa MCLAB2, a possibilidade de manipular mais dois interessantes circuitos integrados com comunicação I2C. Um deles é o PCF8574(A) da Philips que é um extensor de portas de E/S quase bidirecional, o que o torna muito útil quando se faltam portas para um microcontrolador. O outro é um sensor de campo magnético bem sensível o HMC5883L da Honeywell, muito usado em bússolas eletrônicas e com capacidade de medição de campos magnéticos em 3 eixos (x, y, z).
Em resumo, o integrado PCF8574 possui 8 portas de E/S que podem ser escritas ou lidas através de comunicação serial I2C, além de possuir um pino de sinalização de interrupção e 3 linhas de endereçamento para identificar o ci se forem usados vários dispositivos no barramento I2C. Assim ele funciona como um conversor serial-paralelo e vice-e-versa. Como ele tem boa capacidade de corrente nas portas (25mA tanto suprindo como drenando) elas são capazes de acionar diversos dispositivos, como por exemplo, leds, muito facilmente. A velocidade para o clock do I2C deve ser de 100kHz. A diferença entre as versões 8574 e 8574A é apenas no endereçamento do dispositivo escravo.
A seguir a pinagem e o diagrama de blocos do PCF8574.
No diagrama de tempos do fluxo serial, demonstra qual deve ser o byte de controle enviado, sendo que para o PCF8574, o endereço escravo deve ter os 4 bits mais significativos como 0100 (e 0111 para o 8574A), seguido dos 3 bits de endereçamento de dispositivo e finalmente o bit0 significando escrita (0) ou leitura (1).
Aqui o fluxo para escrita:
O fluxo para leitura:
Abaixo o esquema elétrico para a conexão do PIC 16F877 com o PCF8574:
No firmware, o PCF8574 passa a ser a opção de seleção número 11 no menu de seleção de dispositivos e o PCF8574A a opção 12.
Pode-se fazer então a leitura das portas do PCF8574, ou a escrita das portas, onde se entra com o endereço do dispositivo no barramento I2C e em seguida o valor a ser escrito nas 8 portas.
O circuito integrado HMC5883L fornece a medição de campo magnético em 3 eixos, em dois registradores de 2 bytes cada, mas com 12 bits de valor, que representa uma resolução de 2 mili gauss e capacidade de medir até 8 gauss. Esse dispositivo usa tecnologia AMR (anisotropic magneto resistive). Como ele é um ci em encapsulamento smd, geralmente é mais prático utilizá-los através de pequenos módulos, em que há apenas acesso a 5 pinos (alimentação e barramento I2C).
A seguir o diagrama de blocos e interligação com o microcontrolador:
E o esquema completo:
No firmware, o HMC5883L passa a ser a opção 13 no menu de dispositivos. Como a utilização dele é apenas de leitura, na opção de leitura o display passa a apresentar de pronto os valores medidos nos 3 eixos, com polaridade N (negativo) e P (positivo).
A saída se dá pelo botão número 4.
Forneço aqui os códigos hexadecimais a serem gravados no PIC:
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:100010004420031832280830A3005920A20DA30B56
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