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TPIC84000TPWPRQ1 Arkusz danych(PDF) 8 Page - Texas Instruments |
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TPIC84000TPWPRQ1 Arkusz danych(HTML) 8 Page - Texas Instruments |
8 / 29 page I_Antenna I_LS2 I_LS1 0 8 16 24 32 40 0 8 16 24 32 40 LS1 measurement at first rising edge (Timer1 programmed to 76: 38.275 µs) Odd rising edge Even rising edge LS2 measurement at second rising edge (Timer2 programmed to 68: 43.250 µs) Time (µs) TPIC84125-Q1 SLDS175 – AUGUST 2010 www.ti.com Current Measurement From a system's point of view, diagnostics of the antenna operation is done by measuring the load current across the antenna and providing the measured value to the microcontroller via SPI. The microcontroller retrieves the current value and evaluates if there is a failure or not. Within the TPIC84125 the current measurement is done at each Low Side-transistor (LS), though the measurement of the various currents is done sequentially (i.e. first LS1 measurement followed by the LS2 measurement, etc.). The actual measured analog values are converted into five bit resolution digital values and are then stored in the control and status register. As the load current can take between 2 to 10 wave-forms to reach its maximum value; current measurement can depend on the actual application and the specific Q-factor of the antenna circuit. Therefore it is necessary to program the exact time when the current measurement must be performed, and it is also necessary to measure at the specific time within the wave to measure the maximum value. A programmed parameter indicates which outputs are measured, where the low side of the programmed output is measured sequentially. Here the edge (rising or falling) is also programmed, where during the odd (1st, 3rd, 5th, etc) rising or falling edge, the current on the low side of the first programmed output is measured; during the even (2nd, 4th, 6th, etc) rising or falling edge, the current in the low side of the second programmed output is measured. The measurement is performed continuously and the current value updated (over written) every time within the Control and Status register. Figure 4 shows an example of current measurement in a full-bridge configuration. In order to diagnose the operation of the device in full-bridge, it is necessary to measure the current of LS1 and LS2. The two measured values are stored in the Control and Status register. Figure 4. Current Measurement Timing For Full Bridge Setup Control Logic The control logic block contains the SPI interface along with all the other circuitry necessary to convert the SPI commands into the desired outputs. 8 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): TPIC84125-Q1 |
Podobny numer części - TPIC84000TPWPRQ1 |
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Podobny opis - TPIC84000TPWPRQ1 |
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