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LMP90100MHE/NOPB Datasheet(PDF) 32 Page - Texas Instruments |
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LMP90100MHE/NOPB Datasheet(HTML) 32 Page - Texas Instruments |
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32 / 69 page  LMP90100 SNAS510P – JANUARY 2011 – REVISED MARCH 2013 www.ti.com ScanMode1: Multiple-Channels Single Scan LMP90xxx converts one or more channels starting from FIRST_CH to LAST_CH, and then enters the stand-by state. ScanMode2: Multiple-Channels Continuous Scan LMP90xxx continuously converts one or more channels starting from FIRST_CH to LAST_CH, and then it repeats this process. ScanMode3: Multiple-Channels Continuous Scan with Burnout Currents This mode is the same as ScanMode2 except that the burnout current is provided in a serially scanned fashion (injected in a channel after it has undergone a conversion). Thus it avoids burnout current injection from interfering with the conversion result for the channel. The sensor diagnostic burnout currents are available for all four scan modes. The burnout current is further gated by the BURNOUT_EN bit for each channel. ScanMode3 is the only mode that scans multiple channels while injecting burnout currents without interfering with the signal. This is described in details in Burnout Currents. SENSOR INTERFACE LMP90100/LMP90098 contain two types of current sources: excitation currents (IB1 & IB2) and burnout currents. They are described in the next sections. IB1 & IB2 - Excitation Currents IB1 and IB2 can be used for providing currents to external sensors, such as RTDs or bridge sensors. 100µA to 1000µA, in steps of 100µA, can be sourced by programming the ADC_AUXCN: RTD_CUR_SEL bits. Refer to 3–Wire RTD to see how IB1 and IB2 can be used to source a 3-wire RTD. Burnout Currents As shown in Figure 48, the LMP90xxx contains two internal 10 µA burnout current sources, one sourcing current from VA to VINP, and the other sinking current from VINN to ground. These currents are used for sensor diagnostics and can be enabled for each channel using the CHx_INPUTCN: BURNOUT_EN bit. 32 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Product Folder Links: LMP90100 |
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