User's Guide SBAU203 – July 2013 ADS1x20EVM ADS1x20EVM This user's guide describes the characteristics, operation, and use of the ADS1x20EVM. These evaluation modules are an evaluation system for the ADS1220, a 24-bit, low-power, multichannel, delta-sigma (ΔΣ), analog-to-digital converter (ADC) and the ADS1120, which is the 16-bit version of the ADS1220. The EVM allows evaluation of all aspects of the ADS1x20 devices.
www.ti.com 1 2 3 4 5 6 Contents EVM Overview ............................................................................................................... 3 Quick Start ................................................................................................................... 4 Quick Reference ............................................................................................................ 5 Using the ADS1220EVM ADCPro Plug-in ..........................................................
EVM Overview www.ti.com 1 EVM Overview The ADS1x20EVM is an evaluation module that includes an MSP430™ microcontroller and software. The ADS1x20EVM is useful for prototyping designs and firmware as well as for evaluation. 1.
Quick Start 2 www.ti.com Quick Start This section provides a Quick Start guide to quickly begin evaluating the ADS1220EVM with ADCPro. 2.1 Default Jumper and Switch Configuration Figure 1 shows the jumpers found on the EVM and the respective factory default conditions for each. Figure 1. ADS1x20EVM Default Jumper Locations Table 2 lists the primary jumpers and the factory default conditions. Table 2. Default Jumper and Switch Configuration 2.
Quick Reference www.ti.com 3 Quick Reference Table 3 provides a quick summary of the key connections necessary for EVM operation. This information is helpful when using an external processor, or for monitoring EVM operation. Table 3. Critical Connections Function SPI Power Analog inputs Pin Name Description CS JAC.3 (TP1) CS Chip select SCLK JDB.16 (TP2) SCLK Serial clock DIN JAC.15 (TP3) DIN DOUT/DRDY JDB.18 (TP5) DOUT Data out DRDY JAC.11 (TP4) DRDY Data ready +3.3 V JAC.
Using the ADS1220EVM ADCPro Plug-in 4 www.ti.com Using the ADS1220EVM ADCPro Plug-in The ADS1220EVM plug-in for ADCPro provides complete control over all settings of the ADS1220. The plug-in consists of a tabbed interface (see Figure 2), with different functions available on different tabs. The tabs are: • I/O Config • Current & Ref • About The user can adjust the ADS1220EVM settings when not acquiring data. During acquisition, all controls are disabled and settings may not be changed.
Using the ADS1220EVM ADCPro Plug-in www.ti.com 4.2 I/O Config Tab The ADS1220 can acquire data from only one channel at a time. The I/O Config tab (as shown in Figure 2) provides control of the MUX selection. MUX selections correspond to settings described in the ADS1220 product data sheet. The remaining control settings discussed in this document also correspond to settings described in the product data sheet. Figure 2. I/O Config Operating Mode controls the speed of the modulator clock.
Using the ADS1220EVM ADCPro Plug-in www.ti.com When the Internal Temperature Sensor button is activated and lit green, the output result from the ADS1220 is the response of the internal temperature sensor of the ADS1220. The temperature sensor is a precision device and can monitor the internal temperature of the ADS1220. The temperature sensor can also be used for making cold-junction temperature measurements when using thermocouples.
Using the ADS1220EVM ADCPro Plug-in www.ti.com The IDAC Magnitude drop-down menu allows the choice of current settings for the constant-current output digital-to-analog converters (DACs) of the ADS1220. Two current output DACs are available and can be routed independent of one another through the IDAC 1 Routing and IDAC 2 Routing controls. However, the IDAC Magnitude is the same for both current sources and the current output is not independently controlled.
ADS1220EVM Hardware Details 5 www.ti.com ADS1220EVM Hardware Details The ADS1220EVM is designed to easily interface with other control platforms. Dual-row socket options (JAC and JDB) are available on the bottom-side of the EVM, which allows for the controller connection. The pin configuration of the connectors is designed to be compatible with LaunchPad. The connector footprint conforms to Samtec™ connector SSW-110-22-F-D-VS-K, which is a dual-row, 20-pin, surfacemount socket with a 0.
ADS1220EVM Hardware Details www.ti.com 5.2.1 Primary Analog Interface, J4 All available analog pins of the ADS1220 connect to header J4. J4 can be used to connect analog signals from off-board sensors or sources to the ADS1220. Table 5 provides J4 pin descriptions. J4 is a standard 10-pin, dual-row header, with 0.1-inch pin spacing. Table 5. J4: Primary Analog Interface Pinout Description Signal Pin Number Analog dedicated reference input, negative REFN0 J4.
ADS1220EVM Hardware Details 5.2.3 www.ti.com RTD Terminal Block J2 J2 is a four-position screw terminal block that can accept wire sizes AWG 28-16. The main purpose for J2 is to provide a connection for measuring a resistance temperature device (RTD). A two-, three-, or fourwire RTD can be connected to J2. Measurement channels are AIN0 and AIN1. Current excitation is directly possible from AIN0, AIN1, and AIN2. For three-wire RTDs, any combination of two excitation sources can be used.
ADS1220EVM Hardware Details www.ti.com 5.3 Clock Source Options The ADS1220 clock can come from one of several sources: the internal oscillator of the ADS1220, an oscillator installed at U3, a clock supplied by a processor via U8, or an external clock source connected to J8. The default configuration is to use the internal oscillator of the ADS1220. If a precision oscillator is installed at U3, a 10-nF capacitor should also be installed at C21.
ADS1220EVM Hardware Details 5.4.2 www.ti.com JTAG Connector, J10 Firmware downloading and debugging is possible through JTAG connector J10. The 14-pin connector of the MSP-FET430UIF debug interface is reduced to a minimum number of pins to limit connector size and space available on the EVM. The J10 logic levels are 3.3-V CMOS. A four-wire JTAG interface is available. Table 9 shows a comparison between the 14-pin debugger connections in relation to J10.
ADS1220EVM Hardware Details www.ti.com 5.4.3 External Control The header and socket connectors, JAC and JDB, provide access to the digital control and serial data pins of the ADS1220. To use this option, connectors must be installed on the bottom-side of the ADS1220EVM. Also, the on-board controller must have the control functions disabled. The outputs of the on-board controller pass through 3-state buffers, U8. To disable the output of the buffers, jumper JP5 must be shorted.
Schematic and Bill of Materials 6 www.ti.com Schematic and Bill of Materials A complete schematic for the ADS1220EVM is appended to this user's guide. The bill of materials is provided in Table 12 and the schematic is appended to the end of this document. Gerber files are available on request. Please contact the E2E Community Forums and ask for details on how to receive the files. 6.
Schematic and Bill of Materials www.ti.com Table 12. ADS1x20EVM Bill of Materials (continued) Item No. Qty Ref Des Description Manufacturer Part Number 34 1 Value U2 IC, Single 2 Line To 1 Line Data Selector/Multiplexer TI SN74LVC2G157DCT 35 1 U4 IC, 256K CMOS Serial EEPROM Microchip 24AA256-I/ST 36 1 U5 IC, +3.
1 2 3 4 5 6 SCL SDA POWER INDICATORS +3.3V C18 JPR-2X1 1 2 3 4 5 6 7 8 EN GND NC C10 10µF 4 TPS76333DBV D2 Green 2 TDO TDI TMS TCK TEST RESET 1µF HEADER-8 R13 JP7 5V USB A C28 1.0Meg 1 R16 1.40k S2 R17 BSL LOADER 100 USB I/O 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 J9 USB A - PLUG 5 AVDD 6 JP1 JPR-2X1 C22 0.01uF C23 0.01uF +5V DM DP GND SHLD L1 1 2 3 4 R18 33 R19 33 R12 1.0Meg X1 C24 22pF 1 2 J6 J1 C17 +3.3V 2 HEADER-4 0.1µF JP2 JPR-2X1 +3.
EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods.
FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
【Important Notice for Users of EVMs for RF Products in Japan】 】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.
EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use.
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
