MAX14840PMB1# Analog Devices

19-6338 Rev 0 5/12 MAX14840PMB1 Peripheral Module General Description Features The MAX14840PMB1 peripheral module provides the S Half-Duplex RS-485 Transceivers necessary hardware to interface the MAX14840E RS-485 S 40Mbps Maximum Data Rate TM transceiver to any system that utilizes Pmod -compatible S Large (170mV) Receiver Hysteresis expansion ports configurable for a UART interface. The S Symmetrical Fail-Safe Receiver Input IC is a +3.3V ESD-protected transceiver intended for half-duplex RS-485 communication up to 40Mbps*. These S Hot-Swap Capability transceivers are optimized for high speeds over extended S Short-Circuit-Protected Outputs cable runs, while maximizing tolerance to noise. S Thermal Self-Protection The IC features symmetrical fail-safe and larger receiver S Extended ESD Protection for RS-485 I/O Pins hysteresis, providing improved noise rejection and improved recovered signals in high-speed and long- S 6-Pin Pmod-Compatible Connector (Pmod cable applications. Interface Type 4 UART) *The maximum communication speed of this module S Example Software Written in C for Portability is generally less than 10Mbps due to the presence of S RoHS Compliant current-limiting resistors on the data lines of this module S Proven PCB Layout and possibly also the host board. S Fully Assembled and Tested Refer to the MAX14840E IC data sheet for detailed infor- mation regarding operation of the IC. Ordering Information appears at end of data sheet. MAX14840PMB1 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 Maxims website at www.maxim-ic.com.MAX14840PMB1 Peripheral Module Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION JP1 1 2-pin straight male header 1FF Q10%, 10V X7R ceramic C1 1 capacitor (0603) R1R4 4 150I Q5% resistors (0603) TDK C1608X7R1A105K R5 1 120I Q5% resistor (1206) 0.1FF Q10%, 16V X7R ceramic 40Mbps, +3.3V, RS-485 half- C2 1 capacitor (0603) U1 1 duplex transceiver (8 SO) Murata GRM188R71C104KA01D Maxim MAX14840EASA+ J1 1 6-pin right-angle male header 1 Shorting jumper 1 PCB: EPCB14840EPM1 2-position terminal block J2 1 On-Shore Technology ED500/2DS Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com On-Shore Technology, Inc. 480-921-3000 www.on-shore.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX14840PMB1 when contacting these component suppliers. Detailed Description Table 1. Connector J1 (UART Communication) PIN SIGNAL DESCRIPTION UART Interface Receiver-enable input. This active-low The MAX14840PMB1 peripheral module can interface 1 RE pin enables the half-duplex receiver. to the host by plugging directly into a Pmod-compatible port (configured for UART ) through connector J1. Driver input. This pin carries the transmit 2 DI data from the Pmod systems UART Connector J1 provides connection of the module to the transmitter to a connected receiver. Pmod host through an interface similar to the Pmod UART Type 4 standard recommended by Digilent. The Receiver output. This pin carries the transmit driver and receive pin assignment are the same 3 RO half-duplex receive data to the Pmod as the standard. However, the CTS and RTS signals systems UART receiver. are replaced by half-duplex driver- and receiver-enable Driver-output-enable input. This active- signals. See Table 1. 4 DE high pin enables the half-duplex Connector J2 provides the RS-485 positive and negative transmitter. signal pair. See Table 2. 5 GND Ground 6 VCC Power supply Table 2. Connector J2 PIN SIGNAL DESCRIPTION 1 RS485-A Noninverting RS-485 signal 2 RS485-B Inverting RS-485 signal Maxim Integrated Products 2