MAX5825PMB1 Peripheral Module

Transcription

1 9-6; Rev 0; 5/ MAX585PMB Peripheral Module General Description The MAX585PMB peripheral module provides the necessary hardware to interface the MAX585 8-channel DAC to any system that utilizes PmodK-compatible expansion ports configurable for I C communication. The IC features eight independent -bit accurate internally buffered voltage-output DAC channels. The IC also features an internal reference that is selectable between.048v,.500v, and 4.096V (4.096V reference operation is not supported with a standard.v Pmod-port power supply). S Eight High-Accuracy DAC Channels S -Bit Accuracy without Adjustment Features S Precision Voltage Reference Internal to the IC S Provision for Optional External Reference Input S Jumper-Selectable I C Address Setting S 6-Pin Pmod-Compatible Connector (I C) S Secondary Header Allows Daisy-Chaining of Additional Modules on the I C Bus S Example Software Written in C for Portability S RoHS Compliant S Proven PCB Layout S Fully Assembled and Tested Ordering Information appears at end of data sheet. MAX585PMB Peripheral Module Pmod is a trademark of Digilent Inc. Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim s website at

2 Component List DESIGNATION QTY DESCRIPTION C C C, C4 F 0FF Q0%, 0V X5R ceramic capacitor (060) TDK C0X5RA06K/.5.FF Q0%, 0V X5R ceramic capacitor (060) TDK C608X5RA5K/ FF Q0%, 6V X7R ceramic capacitors (060) Murata GRM88R7C04KA0D 4.7FF EMI filter (-terminal capacitor) Murata NFMPC475BAD J 6-pin right-angle male header DESIGNATION QTY DESCRIPTION J 8-pin ( x 4) straight male header J 4-pin ( x 7) straight male header JP, JP -pin straight male headers R R4 4 50I Q5% resistors (060) R5 R9 5 I Q5% resistors (060) R0 0 U Not installed, 00kI resistor (060) Octal-channel, -bit buffered DAC (0 TSSOP) Maxim MAX585AAUP+ Shorting jumpers PCB: EPCB585PM Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc TDK Corp Note: Indicate that you are using the MAX585PMB when contacting these component suppliers. Detailed Description I C Interface The MAX585PMB peripheral module can interface to the host in one of two ways. It can plug directly into a Pmod-compatible port (configured for I C) through connector J, or in this case, other I C boards can attach to the same I C bus through connector J. I C Interface (Daisy-Chaining Modules) Alternatively, the peripheral module can connect to other I C-based Pmod modules using a 4-conductor ribbon cable connecting to the J connector. In this situation, pins -4 and 5-8 on J provide two connections to the I C bus, allowing the module to be inserted into an I C bus daisy-chain. Connector J provides connection of the module to the Pmod host. The pin assignments and functions adhere to the Pmod standard recommended by Digilent. See Table. The J connector allows the module to be connected through a daisy-chain from another I C module and/or provide I C and power connections to other I C modules on the same bus. See Table. Table. Connector J (IC Communication) PIN SIGNAL DESCRIPTION LDAC Active-low asynchronous DAC load input IRQ SCL I C serial clock 4 SDA I C serial data 5 Ground 6 Power supply Active-low open-drain interrupt output. IRQ low indicates a watchdog timeout. Table. Connector J (IC Expansion) PIN SIGNAL DESCRIPTION SCL I C serial clock SDA I C serial data Ground 4 Power supply 5 SCL -wire serial clock. Same as pin above. 6 SDA -wire serial data. Same as pin above. 7 Ground 8 Power supply Maxim Integrated Products

3 I C Addressing Options The I C slave address for the IC can be one of nine different values, depending on the settings on jumpers JP and JP. Table lists the settings of those jumpers and the corresponding values of the slave address A[:0]. Refer to the MAX58/MAX584/MAX585 IC data sheet for more information. External Control Signals The IC implements pins that allow asynchronously updating of all DAC channels simultaneously (LDAC) and simultaneously clearing all DAC channels to their default state (CLR). The CLR pin is only available through the external J connector. The LDAC signal is available from either the Pmod connector (J) or the external connector (J). The default source for LDAC is the Pmod connector (J). To control LDAC from the external connector (J), modify the solder link on the back of the board (labeled LK). The user is cautioned to ensure that only one source for this signal is selected at any given time. The J connector provides the DAC output voltages and the external control inputs. See Table 4. Reset State (M/Z Pin) The IC features a pin-selectable DAC reset state using the M/Z input. Upon a power-on reset, all CODE and DAC data registers are reset to zero scale (M/Z = ) or midscale (M/Z = ). The board is shipped with R installed (0I) and R0 not installed, which sets M/Z to. To change to M/Z =, remove R and install a suitable pullup resistor for R0. Refer to the MAX58/ MAX584/MAX585 IC data sheet for more information. Table. IC Slave Address LSBs JP (ADDR) JP (ADDR0) A A A A0 - () - () - () Open 0 - () - () 0 0 Open - () 0 Open Open 0 0 Open - () () - () () Open () - () Software and FPGA Code 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, 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 functionality 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 Quick start instructions are also available as a separate document. Table 4. Connector J (External Interface) PIN SIGNAL DESCRIPTION Supply voltage LDACEXT Ground 4 CLR Active-low asynchronous DAC load input Active-low asynchronous DAC clear input 5 DAC7 DAC channel 7 voltage output 6 DAC6 DAC channel 6 voltage output 7 DAC5 DAC channel 5 voltage output 8 DAC4 DAC channel 4 voltage output 9 DAC DAC channel voltage output 0 DAC DAC channel voltage output DAC DAC channel voltage output DAC0 DAC channel 0 voltage output REF Reference voltage input/output 4 Ground Maxim Integrated Products

4 IC Expansion Connector J J R R R R4 50 LDAC 50 IRQ 50 SCL 50 SDA R5 R6 F EMIFILT C 0uF C.uF Select LDAC Source LDAC LDACEXT R 0 LK LINKB Do Not Install R0 00k C4 0.uF R7 R8 R9 SDA SCL LDAC CLR IRQ U IO LDAC SDA SCL CLR IRQ M/Z ADDR ADDR0 MAX585 DAC0 DAC DAC DAC DAC4 DAC5 DAC6 DAC7 REF C DAC0 DAC DAC DAC DAC4 DAC5 DAC6 DAC7 REF 0.uF DAC7 DAC5 DAC DAC REF J Output Connector LDACEXT CLR DAC6 DAC4 DAC DAC0 JP JP IC Address Selection Figure. MAX585PMB Peripheral Module Schematic Maxim Integrated Products 4

5 Figure. MAX585PMB Peripheral Module Component Placement Guide Component Side Figure. MAX585PMB Peripheral Module PCB Layout Component Side Figure 4. MAX585PMB Peripheral Module PCB Layout Inner Layer (Ground) Maxim Integrated Products 5

6 Figure 5. MAX585PMB Peripheral Module PCB Layout Inner Layer (Power) Figure 6. MAX585PMB Peripheral Module PCB Layout Solder Side Figure 7. MAX585PMB Peripheral Module Component Placement Guide Solder Side Maxim Integrated Products 6

7 Ordering Information PART MAX585PMB# #Denotes RoHS compliant. TYPE Peripheral Module Maxim Integrated Products 7

8 REVISION NUMBER REVISION DATE DESCRIPTION Revision History PAGES CHANGED 0 5/ Initial release 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, 0 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.