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NFM21CC101U1H3D Datasheet(PDF) 4 Page - Texas Instruments |
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NFM21CC101U1H3D Datasheet(HTML) 4 Page - Texas Instruments |
4 / 30 page GND REF - IN2+ IN2 - REF+ IN1+ OUT+ EXC - OUT - EXC+ IN1 - +5VA Getting Started www.ti.com 1.2 Controls The main controls for the ADS1232REF are the four buttons and the mode selection slide-switch (see Figure 1). The slide-switch selects between weigh-scale (Scale) and Analysis modes. The ADS1232REF switches modes only when it is displaying data. If the switch is changed in a configuration mode, nothing happens until the configuration mode is exited. At that time the ADS1232REF reads the switch and enters the selected mode. The four buttons have different functions, depending on the operating mode. In Scale mode, the switches have the functions in the box labeled SCALE. In Analysis mode, the switches have the functions shown in the box labeled ANALYSIS. In configuration mode, the switches have the functions shown in the box labeled CONFIG. The buttons also have different names in different modes. In this document, they are identifed by the respective names they have in the mode under discussion. 1.2.1 Auxiliary Controls The Reset switch resets the board, except for the USB interface. The USB Reset switch resets the USB interface. If USB communication fails, pressing USB Reset may solve the problem. The Programming Mode switch is used to update the firmware. For normal operation, it should be set to JTAG. 1.3 Powering the Board To apply power to the ADS1232REF, connect a 9V battery or plug in a 6V to 9V ac wall adapter. AC adapters must be tip positive/sleeve negative. When an ac adapter is plugged in, the board always takes power from it, and not from the battery. The ADS1232REF is protected against polarity reversal. If a power source is connected in reverse by mistake, the display remains blank. To prevent damage to the board, do not leave a reversed power source connected for longer than a few seconds. 1.4 Connecting a Load Cell The ADS1232REF is specifically designed for connection to load cells. Two connectors are provided for this application. The terminal block is used for load cells having stripped wire connections; the load cell header is for load cells having a header connector. The terminal block provides connections to the reference input, the power supply, and both input channels. The header has switched excitation. 1.4.1 Connecting a 4-Wire Load Cell to the Terminal Block Figure 2 shows the connection of a 4-wire load cell to the terminal block. In this configuration, the load cell is excited by the +5V power supply, and the ADC ’s reference is taken from the power supply. Figure 2. 4-Wire Load Cell to Terminal Block For this configuration, the reference select switch must be in the +5VA position. 4 ADS1232REF User 's Guide SBAU120B – November 2005 – Revised July 2011 Submit Documentation Feedback Copyright © 2005–2011, Texas Instruments Incorporated |
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