I2C-IN830M, I2C-IN830MA 8-Input Optocouplers I2C-bus, DIN rail supports

Transcription

1 I2C-IN83M, I2C-IN83MA 8-Input Optocouplers I2C-bus, DIN rail supports Features PCF8574 and PCF8574A I2C chips upport khz I2C bus frequency On-board I2C bus pull-up resistors Address by 3 jumpers for use of up to 8 addresses Up to 6 boards on a bus Interrupt output signal On-board interrupt pull-up resistor Compatible with most microcontrollers 8 Optically isolated digital input channels 5-3VDC input voltage, I2C-IN83M, I2C-IN83MA 5-3VDC input voltage, I2C-IN83M, I2C-IN83MA 37VDC isolation input voltage Operating power supply voltage VDC Inverse polarity protection circuits DIN-rail supports PCB size 42.5x72.mm Description These are 8-channel opto-isolator boards for input expander over I2C bus. Each input of the I2C-IN83M and I2C-IN83MA accepts 5-3VDC. It is suitable for mechanical contact switching devices such as relay switches, push-buttons and switches. But each input of the I2C-IN83M and I2C-IN83MA accepts 5-3VDC. It is suitable for solid-state switching devices such as proximity switches. The boards use PCF8574 and PCF8574A for I2C chips. They support KHz bus speed and VDC bus voltage. Each board has three jumpers for setting an own I2C bus address. o they can be connected up to 6 boards on a bus by setting different addresses. Also there are I2C bus pull-up resistors and interrupt pull-up resistor on board which they can be enabled by jumpers. The board can be placed on DIN rail PCB holder which can be plugged on a DIN rail tray. Diagrams Inverse Polarity Protection IN IN2 CL DA I2C Controller PCF8574 PCF8574A 8 channels Opto-Isolator 8 8 Inverse Polarity Protection IN3 IN4 IN5 IN6 IN7 IN8 A A Figure : Block Diagram ERE Company Limited April 2, 24

2 I2C-IN83M, I2C-IN83MA, I2C-IN83M, I2C-IN83MA ADDREE R-PULL UP DA CL + IN - IN + IN2 - IN2 + IN3 - IN3 + IN4 - IN4 - IN8 + IN8 - IN7 + IN7 - IN6 + IN6 - IN5 + IN5 Figure 2: Board Diagram Table : Pin Descriptions ymbol CL DA R-PULL DA R-PULL CL R-PULL A A +IN +IN8 -IN -IN8 Descriptions Power supply input voltage VDC Ground I2C bus serial clock signal I2C bus serial data signal Interrupt output signal A jumper for selecting K pull-up resistor of DA signal A jumper for selecting K pull-up resistor of CL signal A jumper for selecting K pull-up resistor of signal A jumper for selecting address A A jumper for selecting address A A jumper for selecting address Positive voltage for input to input8 Negative voltage for input to input8 I2C Bus Pull-Up Registers The I2C bus wants pull-up resistors for CL and DA lines. The board has two of k pull-up resistors for this purpose. These resistors can be enabled by closing jumpers. These resistors have to be enabled if there is no any pull-up resistor on a bus or a microcontroller board. When multiple boards are connecting together on a bus. Usually the pull-up resistors of only one board are enabled. The bus is very strong if all pull-up resistors are enabled. o the microcontroller cannot drive the bus. ERE Company Limited. 2/7

3 I2C-IN83M, I2C-IN83MA, I2C-IN83M, I2C-IN83MA Enable Disable Disable Disable K K K K K K K K CL DA CL DA Board Board2 Board3 Figure 3: I2C bus pull-up resistors Board4 Interrupt ignal Interrupt output signal () on board can be connected to the interrupt input pin of microcontroller. The board sends an interrupt signal on this line. o the board can inform the microcontroller if there is incoming voltage on its inputs without having to poll over the I2C bus. The interrupt output pin is an open-drain and it is connected to K pull-up resistor via a jumper. When boards are connected together on an interrupt line. Usually the only one pull-up resister has to be enabled. Each board takes logical OR to another boards, many interrupt signals can occur at the same time. K K K K K x Enable Disable Disable Disable Disable Board Board2 Board3 Board4 Board5 Figure 4: Logical OR interrupt signals ERE Company Limited. 3/7

4 I2C-IN83M, I2C-IN83MA, I2C-IN83M, I2C-IN83MA DA CL DA CL to another board Figure 5: Interfacing The boards can be connected all together up to 6 boards on a bus by connecting 8 boards of I2C-IN83M and 8 boards of I2C-IN83MA. Because each board has own address which is difference to address of another boards. I2C-IN83MA (No. 6) Address 7F I2C-IN83MA (No. 5) Address 7D I2C-IN83MA (No. 4) Address 7B I2C-IN83MA (No. 9) Address 7 I2C bus I2C-IN83M (No. ) Address 4 I2C-IN83M (No. 6) Address 4B I2C-IN83M (No. 7) Address 4D I2C-IN83M (No. 8) Address 4F Figure 6: Boards on a bus ERE Company Limited. 4/7

5 I2C-IN83M, I2C-IN83MA, I2C-IN83M, I2C-IN83MA x4f A A A x7f A A A x4d A A A x7d A A A x4b A A A x7b A A A x49 A A A x79 A A A x47 A A A x77 A A A x45 A A A x75 A A A x43 A A A x73 A A A x4 A A A x7 A A A OPEN (HIGH) CLOE (LOW) I2C-IN83M PCF8574 OPEN (HIGH) CLOE (LOW) I2C-IN83MA PCF8574A Figure 7: Addressing Each board can be defined own address by setting jumper A, A and as above figure. ERE Company Limited. 5/7

6 IN 8 IN 7 IN 6 IN 5 I2C-IN83M, I2C-IN83MA, I2C-IN83M, I2C-IN83MA Input Diagram IN 4 IN 3 IN 2 I2C-IN83M PFC8574 IN When inputs are read through I2C protocol. The first byte is address and the second byte is data of inputs. IN will pass to P and IN2 will pass to P respectively, until IN8 will pass to P7. Table 2: Absolute maximum ratings at = 5VDC PAPAMETER I2C-IN83M, I2C-IN83MA I2C-IN83M, I2C-IN83MA Bus frequency Khz max Khz max I2C chips A A A P7 P6 P5 P4 P3 P2 P P A P I2C-IN83MA PFC8574A PCF8574 is used in I2C-IN83M PCF8574A is used in I2C-IN83MA Bus logic voltage VDC VDC Max input voltage 3. VDC 3. VDC ON voltage/current ADDRE BYTE DATA BYTE DATA BYTE n A A A P7 P6 P5 P4 P3 P2 P P A P ADDRE BYTE DATA BYTE DATA BYTE n Figure 8: Input Data Frame 5. VDC min., 4mA 24. VDC, 7mA 3. VDC, 8.7mA PCF8574 is used in I2C-IN83M PCF8574A is used in I2C-IN83MA 5. VDC min, 3.5mA 2. VDC,.8mA 24. VDC, 22.8mA 3. VDC, 29mA OFF voltage/current 5. VDC max., ma 2. VDC max, ma Input impedance 3.3Kohm Kohm Max. boards on a bus 6 boards 6 boards Optical isolated input voltage 3.7kVDC 3.7kVDC Input channels 8 channels 8 channels Operating Temperature -7 C -7 C ERE Company Limited. 6/7

7 I2C-IN83M, I2C-IN83MA, I2C-IN83M, I2C-IN83MA Dimensions a A 2.mm I2C Bus Connector unit inch mm L B W W C D E B E L C D C A a Figure 9: Dimensions ERE Company Limited. 7/7