19-6328; Rev 0; 5/12 MAX9611PMB1 Peripheral Module General Description The MAX9611PMB1 peripheral module provides the necessary hardware to interface the MAX9611 currentsense amplifier with 12-bit ADC and op amp, along with the MAX5380 8-bit DAC, to any system that utilizes PmodK-compatible expansion ports configurable for I2C communication. The IC is configured with an external p-channel FET and a current-sense resistor to form a current-limiting circuit capable of handling currents up to 1A. An 8-bit DAC (U1) is used to set the currentlimit point programmatically by the host through the I2C bus. In addition to providing a programmable currentlimit function, the ADC within the IC measures the load current/voltage and the set-point voltage that can be read by the host through the I2C bus. Refer to the MAX9611 IC data sheet for detailed information regarding operation of the IC. Features S Programmable Current Limit Up to 1A S Two Current Ranges (Jumper Selectable) S Measure and Read Back Load Current, Load Voltage, and Set Point S Power Source Up to 30V S Jumper-Selectable I2C Address Setting for the MAX9611 S 6-Pin Pmod-Compatible Connector (I2C) S Secondary Header Allows Daisy-Chaining of Additional Modules on the I2C 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. MAX9611PMB1 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. MAX9611PMB1 Peripheral Module Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY C1, C2, C3 3 0.1FF Q10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C104KA01D Q1 1 2.2A, 30V p-channel MOSFET (3 SOT23) Vishay Si2303CDS C4 1 4.7FF Q10%, 10V X5R ceramic capacitor (0603) TDK C2012X5R1A475K/0.85 1 10FF Q10%, 10V X5R ceramic capacitor (0603) TDK C2012X5R1A106K/1.25 C5 C6 1 C7 F1 0.01FF Q10%, 16V X7R ceramic capacitor (0603) Murata GRM188R71C103KA01D 1 4.7FF EMI filter (3-terminal capacitor) Murata NFM21PC475B1A3D J1 1 6-pin right-angle male header J2 1 8-pin (2 x 4) straight male header J3, JP1, JP2, JP3 4 R1–R5 5 4.7kI Q1% resistors (0603) R6, R7 2 150I Q5% resistors (0603) R8 1 7.5kI Q1% resistor (1206) R9 1 845I Q1% resistor (1206) R10 1 4.02kI Q1% resistor (0603) R11 1 402I Q1% resistor (0603) R12 1 8.06kI Q1% resistor (0603) R13 1 0.2I Q1%, 2W current-sense resistor (2512) Stackpole CSRN2512FKR200 R14, R15 2 10kI Q5% resistors (0603) U1 1 Low-cost, 8-bit DAC (5 SOT23) Maxim MAX5380MEUK+ U2 1 Current-sense amplifier with 12-bit ADC (10 FMAXM) Maxim MAX9611AUB+ — 3 Shorting jumpers — 1 PCB: EPCB9611PM1 1FF Q10%, 10V X7R ceramic capacitor (0603) TDK C1608X7R1A105K 1 DESCRIPTION 3-pin straight male headers 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 Vishay 402-563-6866 www.vishay.com Note: Indicate that you are using the MAX9611PMB1 when contacting these component suppliers. Detailed Description I2C Interface The MAX9611PMB1 peripheral module can interface to the host in one of two ways. It can plug directly into a Pmod-compatible port (configured for I2C) through connector J1, or in this case, other I2C boards can attach to the same I2C bus through connector J2. I2C Interface (Daisy-Chaining Modules) Alternatively, the peripheral module can connect to other I2C-based Pmod modules using a 4-conductor ribbon cable connecting to the J2 connector. In this situation, pins 1-4 and 5-8 on J2 provide two connections to the I2C bus, allowing the module to be inserted into an I2C bus daisy-chain. Table 1. Connector J1 (I2C Communication) PIN SIGNAL 1 N.C. Not connected DESCRIPTION 2 N.C. Not connected 3 SCL I2C serial clock 4 SDA I2C serial data 5 GND Ground 6 VCC Power supply Connector J1 provides connection of the module to the Pmod host. The pin assignments and functions adhere to the Pmod standard recommended by Digilent. See Table 1. µMAX is a registered trademark of Maxim Integrated Products, Inc. __________________________________________________________________ Maxim Integrated Products 2 MAX9611PMB1 Peripheral Module Connector J2 allows the module to be connected through a daisy-chain from another I2C module and/or provide I2C and power connections to other I2C modules on the same bus. See Table 2. I2C Addressing Options Both the MAX5380M and MAX9611 reside on the I2C bus. The MAX5380M has a fixed I2C slave address of 0x62 (other versions of the MAX5380 are available with different I2C slave addresses). The I2C slave address for the MAX9611 can be one of nine different values depending on the settings on jumpers JP2 and JP3. Table 3 lists the settings of those jumpers and the corresponding values of the slave read and write address. Refer to the MAX9611/MAX9612 IC data sheet for more information. Table 2. Connector J2 (I2C Expansion) PIN SIGNAL 1 SCL I2C serial clock DESCRIPTION 2 SDA I2C 3 GND Ground 4 VCC Power supply 5 SCL I2C serial clock 6 SDA I2C serial data 7 GND Ground 8 VCC Power supply Connecting an External Power Supply and Load The peripheral module provides high-side current limiting for an external power supply and load. The supply and load should be connected to the peripheral module, as shown in Figure 1. Although the IC is capable of operation up to 60V, the external supply should not exceed 30V due to voltage limitations of the Si2303 pFET. While the pass components are rated to 2.7A, operation above 1A may not yield reliable results due to thermal limitations. Reliable operation of this circuit above 1A should be possible in the user’s application if additional surface/heatsink area for both the Si2303 pFET and the 0.2I sense resistor is provided. The J3 connector provides for the attachment of an external power supply and load. See Table 4. Table 4. Connector J3 (External Power and Load) PIN SIGNAL DESCRIPTION 1 Power source This pin should be attached to the positive terminal of the external power supply. The external power source should be greater than 0V and less than 30V. 2 Load This pin should be attached to a groundreferenced load. 3 Ground External ground. This ground connection is referenced to the module ground on pin 5 of connector J1. serial data Table 3. I2C Slave Addresses (MAX9611) DEVICE ADDRESS (hex) JP2 (A0) JP3 (A1) WRITE READ 1-2 1-2 0xE0 0xE1 1-2 2-3 0xE4 0xE5 1-2 Open 0xE6 0xE7 2-3 1-2 0xF0 0xF1 2-3 2-3 0xF4 0xF5 2-3 Open 0xF6 0xF7 Open 1-2 0xF8 0xF9 Open 2-3 0xFC 0xFD Open Open 0xFE 0xFF MAX9611PMB1 CONTROL J3 V+ LD SENSE 1A MAX 30V DC MAX GND LOAD Figure 1. Connection of an External Power Supply and Load __________________________________________________________________ Maxim Integrated Products 3 MAX9611PMB1 Peripheral Module Current Limit The point at which current limiting begins is determined by the voltage at pin 4 on the MAX9611 (VSET). This voltage is set by the output of the DAC (MAX5380) and the setting of the shunt on JP1, which selects either VDAC or VDAC/10. The nominal 2.00V output of the DAC is divided to 1.26V full scale by the divider formed by R3 and R8 + R9. The lower tap of that divider (R3 + R8 and R9) provides 0.126V full scale. The position of the shunt on JP1 determines which of the two voltages is connected to VSET on the MAX9611. With the shunt connected between JP1-1 and JP1-2, the higher voltage (VDAC) is connected to VSET. This setting allows full-scale current limit at 2.56A with 10mA steps (Caution: Although software settings do not prohibit it, the circuit should not be operated above 1A output current as overheating and unreliable operation could result). When the shunt is connected between JP1-2 and JP1-3, the full-scale current is 256mA with 1mA steps. Important: The total power dissipation for the pass FET (Q1) should not exceed 1.5W. This can easily be exceeded with even moderate output current if the load voltage is high and the load resistance is low. The JP1 connector determines the current-limit range and step size. Note: Do not operate the board without a shunt in place, in one of these two positions. See Table 5. 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 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 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 www.maxim-ic.com. Quick start instructions are also available as a separate document. Table 5. Jumper JP1 (Current-Limit Range) SHUNT POSITION VSET FULL-SCALE CURRENT LIMIT (A) CURRENTLIMIT STEP SIZE (mA) 1-2 VDAC 2.56 10 2-3 VDAC/10 0.256 1 __________________________________________________________________ Maxim Integrated Products 4 1 2 3 GND JP2 VCC2 R14 10k R4 4.7k J2 5 6 7 8 1 2 3 GND JP3 VCC2 R15 10k R5 4.7k I2C Address Selection GND 1 2 3 4 GND 6 SCL 8 9 7 SDA A1 A0 SCL SDA U2 0.1uF GND VCC2 C2 GND 4.7uF VCC2 GND F1 SET RS- RS+ OUT 4 3 2 1 C5 10uF VCC2 GND C3 0.1uF VSET 8.06k 1% R12 R11 402 1% C7 0.01uF GND 3 EMIFILT GND MAX9611 1 SCL SDA R1 4.7k VCC VCC R2 4.7k 150 150 GND VCC VCC2 C4 R6 R7 2 R10 4.02k G SCL D S 5 JP1 1 2 3 VCC2 C6 1uF GND Q1 Si2303CDS GND SCL SDA U1 GND VDAC10 VDAC R13 0.2 1% 2 Watt 0.1uF SDA 4 C1 Sense Resistor VCC2 3 VDD GND 2 I2C Expansion Connector 1 2 3 4 5 6 10 VCC GND 5 J1 OUT MAX5380 R3 J3 1 2 3 R9 845 1% VDAC10 VDAC Load Ground Power source GND R8 7.5k 1% 4.7k 1% GND 1 MAX9611PMB1 Peripheral Module Figure 2. MAX9611PMB11 Peripheral Module Schematic __________________________________________________________________ Maxim Integrated Products 5 MAX9611PMB1 Peripheral Module Figure 3. MAX9611PMB11 Peripheral Module Component Placement Guide—Component Side Figure 4. MAX9611PMB11 Peripheral Module PCB Layout—Component Side Figure 5. MAX9611PMB11 Peripheral Module PCB Layout—Inner Layer 1 (Ground) __________________________________________________________________ Maxim Integrated Products 6 MAX9611PMB1 Peripheral Module Figure 6. MAX9611PMB11 Peripheral Module PCB Layout—Inner Layer 2 (Power) Figure 7. MAX9611PMB11 Peripheral Module PCB Layout—Solder Side Figure 8. MAX9611PMB11 Peripheral Module Component Placement Guide—Solder Side __________________________________________________________________ Maxim Integrated Products 7 MAX9611PMB1 Peripheral Module Ordering Information PART TYPE MAX9611PMB1# Peripheral Module #Denotes RoHS compliant. __________________________________________________________________ Maxim Integrated Products 8 MAX9611PMB1 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 9 Maxim is a registered trademark of Maxim Integrated Products, Inc.