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DS3900H2EVKIT Datasheet(PDF) 6 Page - Maxim Integrated Products |
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DS3900H2EVKIT Datasheet(HTML) 6 Page - Maxim Integrated Products |
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6 / 14 page  Maxim Integrated │ 6 DS3900H2 www.maximintegrated.com USB HID Communications Module for Evaluation Kits Designing Hardware to Utilize the Built-In Support for SPI Devices The IC has custom firmware that utilizes a master synchronous serial port (MSSP) of the microcontroller configured in SPI mode, which allows fast communication toSPIdevices.Toutilizethisfirmware,connectCEtoP6, the MISO bus to P11, the MOSI bus to P9, and the SCK bustoP10,asshowninFigure3.TheIChasbuilt-inpul- lup resistors (R11, R12) that connect 4.7kΩ resistors to both MISO and SCK; this is not applicable for SPI com- munication and must be removed. FordesignsthatonlyusetheICtocommunicatetoSPI devices, the following items must be accounted for in the hardware design: ● Place the mating connectors on the circuit board (seeFigure5). ● ConnectVCCandallthreeGNDgroundterminals. ● ConnectCEtoP6,theMISObustoP11,theMOSIbus to P9, and the SCK bus to P10 of the IC. ● Removethebuilt-inpullupresistors(R11,R12). ● Drive the IC with evaluation software provided by Maxim Integrated. Designing Hardware to Utilize the General- Purpose Bit I/O Signals Utilizing the IC for general-purpose bit I/O is equally simple as using it for I2CandSPIapplications.AlltheI/O pins with the exception of P3 have three-state outputs. These signals can be written to a 0 or a 1 and can be read as inputs. P3 has an open-drain output and can be read as an input pin as well; however, its default function is a system pulse that provides a visual indication, through the attached LED, that the IC is operating properly (see Figure 7). The P3 pin defaults to a slow-pulsing output that can be disabled, but designs using P3 for I/O should be con- scious that the IC could attempt to blink P3 before the pulse function is disabled.As long as the IC connected to P3 is tolerant of this behavior, P3 can be used as an additional I/O. When using P3 as an I/O pin with the attached LED, writing it to a 1 turns off the pulldown transistor, which turns the LED off, and writing it to a 0 turnsthepulldownandtheLEDon. Figure 3. DS3900H2 Typical I2C Operating Circuit MINI-USB CABLE HID CLASS PC P1 P2 HB/P3 MCLR GND P4 P5 GND P11-SDA P10-SCL GND VDUT* R12 VCC VCC GND SCL I2C BUS I2C DEVICE #1 VCC P9 P8 P7 P6 USB MODULE DS3900H2 R11 VCC SDA VCC GND SCL I2C DEVICE #2 SDA * VDUT AND GND MUST BE PROVIDED FROM EXTERNAL SUPPLY. |
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