19-6331; Rev 0; 5/12 MAX14850PMB1 Peripheral Module General Description Features The MAX14850PMB1 peripheral module utilizes the MAX14850 digital isolator to isolate another SPI- or UARTbased module from any host system that utilizes PmodKcompatible expansion ports configurable for either a UART or SPI interface. This peripheral module is first plugged into the host Pmod port. Another UART- or SPI-based module plugged into the 12-pin Pmod-compatible connector on this peripheral module is galvanically isolated from the host and referenced to a secondary power supply connected to this peripheral module. SIsolates SPI- or UART-Based Pmod-Compatible Modules from the Host System The IC is a 6-channel digital isolator utilizing Maxim’s proprietary process technology, whose monolithic design provides a compact and low-cost transfer of digital signals between circuits with different power domains. Of the six total channels, the four unidirectional channels are each capable of DC to 50Mbps, with two of the four channels passing data across the isolation barrier in each direction. The two bidirectional channels are open drain and each is capable of data rates from DC to 2Mbps. SShort-Circuit Protection on Unidirectional Outputs Refer to the MAX14850 IC data sheet for detailed information regarding operation of the IC. SData Rates from 2Mbps to 20Mbps or Greater, Depending on Configuration S2-Pin Header to Connect External Voltage for Isolated Module S600VRMS Isolation for 60s SIsolates Four SPI or UART Signals and Two Control Signals S12-Pin Pmod-Compatible Male Connector to Host S12-Pin Pmod-Compatible Female Connection for Module to be Isolated SRoHS Compliant SProven PCB Layout SFully Assembled and Tested Ordering Information appears at end of data sheet. MAX14850PMB1 Peripheral Module Pmod is a trademark of Digilent Inc. __________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. MAX14850PMB1 Peripheral Module Component List DESIGNATION QTY C1, C2 2 C3 J1 DESCRIPTION DESIGNATION QTY J2 1 12-pin (2 x 6) right-angle female header 0.1FF Q10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C104KA01D 1 1FF Q10%, 10V X7R ceramic capacitor (0603) TDK C1608X7R1A105K 1 12-pin (2 x 6) right-angle male header DESCRIPTION J3 1 2-pin straight male header R1–R6 6 150I Q5% resistors (0603) R7–R10 4 4.7kI Q5% resistors (0603) U1 1 6-channel digital isolator (16 SO) Maxim MAX14850ASE+ — 1 PCB: EPCB14850PM1 Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX14850PMB1 when contacting these component suppliers. Detailed Description UART Interface Table 1. Connector J1 (with SPI/UART Peripheral Attached to J2) The MAX14850PMB1 peripheral module can interface to the host by plugging directly into a Pmod-compatible port (configured for SPI or UART) through connector J1. See Table 1. PIN SIGNAL DESCRIPTION 1 SS_CTS Serial select/clear to send 2 MOSI_TXD Master-out slave input/host transmit 3 MISO_RXD Master-in slave output/host receive Connector J2 provides the galvanically isolated connection to another peripheral module. Note that even though the pinout numbering is different than J1, the signals from the top row of pins on J1 are passed through to the top row of pins on J2. See Table 2. 4 SCK_RTS 5 GND Ground 6 VCC Power supply 7 SPAREIN 8 N.C. Not connected Connector J3 provides power from the 2nd power domain to the isolated side of the IC and the isolated Pmod. 9 N.C. Not connected 10 SPAREIO Software and FPGA Code 11 GND Ground 12 VCC Power supply Example software and drivers are available that execute directly without modification on several FPGA development boards that support an integrated or synthesized microprocessor. These boards include the Digilent Nexys 3, Avnet LX9, and Avnet ZEDBoard, although other platforms can be added over time. Maxim provides complete Xilinx ISE projects containing HDL, Platform Studio, and SDK projects. In addition, a synthesized bit stream, ready for FPGA download, is provided for the demonstration application. The software project (for the SDK) contains several source files intended to accelerate customer evaluation and design. These include a base application (maximModules.c) that demonstrates module functional- Serial clock/ready to send Spare input from Pmod to host Spare input/output ity, and uses an API interface (maximDeviceSpecific Utilities.c) to set and access Maxim device functions within a specific module. The source code is written in standard ANSI C format, and all API documentation including theory/operation, register description, and function prototypes are documented in the API interface file (maximDeviceSpecificUtilities.h & .c). The complete software kit is available for download at www.maxim-ic.com. Quick start instructions are also available as a separate document. __________________________________________________________________ Maxim Integrated Products 2 MAX14850PMB1 Peripheral Module Table 2. Connector J2 Table 3. Connector J3 PIN SIGNAL 1 O_SPAREIN DESCRIPTION 2 N.C. Not connected 3 N.C. Not connected 4 O_SPAREIO 5 O_GND Ground from 2nd power domain (supplied through J3) 6 O_VCC Power from 2nd power domain (supplied through J3) Spare input from Pmod to host O_SS_CTS 8 O_MOSI_TXD Master-out slave input/host transmit Master-in slave output/host receive 9 O_MISO_RXD O_SCK_RTS 11 O_GND Ground from 2nd power domain (supplied through J3) 12 O_VCC Power from 2nd power domain (supplied through J3) J1 1 2 3 4 5 6 VCC 7 8 9 10 11 12 O_VCC VCC for the 2nd power domain (up to 600VRMS separation) 2 O_GND Ground for the 2nd power domain R1 150 SPAREIN O_SPAREIN R2 150 SPAREIO GND VCC O_SPAREIO O_GND O_VCC Host Side GND C1 R8 4.7k 1 2 3 4 5 6 O_SS-CTS O_MOSI-TXD O_MISO-RXD O_SCK-RTS O_GND O_VCC 7 8 9 10 11 12 O_VCC U1 1 VCC J2 Peripheral Side 0.1uF VCC R7 4.7k 1 Serial clock/ready to send 150 150 150 150 VCC DESCRIPTION Serial select/clear to send 10 R3 R4 R5 R6 SIGNAL Spare input/output 7 SS-CTS MOSI-TXD MISO-RXD SCK-RTS GND VCC PIN MOSI-TXD 2 SCK-RTS 3 MISO-RXD 4 SPAREIN 5 SS-CTS 6 SPAREIO 7 GND 8 O_VCC MAX14850 VCCA VCCB INA1 OUTB1 INA2 OUTB2 OUTA1 INB1 OUTA2 INB2 I/OA1 I/OB1 I/OA2 I/OB2 GNDA GNDB O_GND C2 0.1uF 16 15 O_MOSI-TXD 14 O_SCK-RTS 13 O_MISO-RXD 12 O_SPAREIN 11 O_SS-CTS 10 O_SPAREIO 9 O_VCC O_VCC R9 4.7k R10 4.7k O_GND External Power Connector J3 1 2 O_VCC O_GND C3 1uF O_GND Figure 1. MAX14850PMB1 Peripheral Module Schematic __________________________________________________________________ Maxim Integrated Products 3 MAX14850PMB1 Peripheral Module Figure 2. MAX14850PMB1 Peripheral Module Component Placement Guide—Component Side Figure 3. MAX14850PMB1 Peripheral Module PCB Layout—Component Side Figure 4. MAX14850PMB1 Peripheral Module PCB Layout—Inner Layer 1 (Ground) __________________________________________________________________ Maxim Integrated Products 4 MAX14850PMB1 Peripheral Module Figure 5. MAX14850PMB1 Peripheral Module PCB Layout—Inner Layer 2 (Power) Figure 6. MAX14850PMB1 Peripheral Module PCB Layout—Solder Side Figure 7. MAX14850PMB1 Peripheral Module Component Placement Guide—Solder Side __________________________________________________________________ Maxim Integrated Products 5 MAX14850PMB1 Peripheral Module Ordering Information PART TYPE MAX14850PMB1# Peripheral Module #Denotes RoHS compliant. __________________________________________________________________ Maxim Integrated Products 6 MAX14850PMB1 Peripheral Module Revision History REVISION NUMBER REVISION DATE 0 5/12 DESCRIPTION Initial release PAGES CHANGED — Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2012 Maxim Integrated Products 7 Maxim is a registered trademark of Maxim Integrated Products, Inc.