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MSP430 Datasheet(PDF) 32 Page - Texas Instruments |
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MSP430 Datasheet(HTML) 32 Page - Texas Instruments |
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32 / 88 page  7.3.2.2 ADC Custom Channel Sequencer The device uses a custom channel sequencer to control the multiplexer of the ADC. The ADC sequencer allows the user to specify which channels are converted. The sequencer consists of 16 indexed slots with programmable start and stop index fields to configure the start and stop conversion points. In direct-mode conversion, the ADC converts from the start index to the stop index once and then stops. In auto-mode conversion, the ADC converts from the start to stop index repeatedly until the ADC is stopped. Figure 7-9 shows the indexed custom channel sequence slots available in the device. ADC OFFSET AIN0 AIN1 TEMP SD MUX GND GND VREF PVDD VDD ZTAT VOUT 0 1 2 3 4 - 8 9 … 15 4 5 6 7 8 ADC_INDEX_CFG.START ADC_INDEX_CFG.STOP Register 09h Custom Channel Sequencer (CCS) Pointer Self Diagnostic Multiplexer (SD MUX) Figure 7-9. ADC MUX Control Table 7-5 lists the ADC input channel assignments for the sequencer. Table 7-5. Indexed Custom Channel Sequence CCS POINTER CHANNEL CONV_RATE RANGE 0 OFFSET 2560 Hz VREF 1 AIN0 Programmable Programmable 2 AIN1 Programmable Programmable 3 TEMP 2560 Hz VREF 4 SD0 (VREF) 2560 Hz VREF 5 SD1 (PVDD) 2560 Hz VREF 6 SD2 (VDD) 2560 Hz VREF 7 SD3 (ZTAT) 2560 Hz VREF 8 SD4 (VOUT) 2560 Hz VREF when PVDD = 1.8 V 2 × VREF when PVDD ≥ 2.7 V 9-15 GND 2560 Hz VREF Use the ADC_INDEX_CFG register to select the channels. The order of the channels is fixed and shown in Table 7-5. Then, use ADC_INDEX_CFG.START and ADC_INDEX_CFG.STOP to select the range of indices to convert. If these two values are the same, then the ADC only converts a single channel. If the START and STOP values are different, then the ADC cycles through the corresponding indices. By default, all channels are configured to be converted; START = 0 and STOP = 8. If the AIN1 channel is not configured as an ADC input, then the result for this channel is 0x000. The minimum time for a conversion is still allotted to AIN1 if the channel is within the START and STOP range. If START is configured to be greater than STOP, then the device interprets the conversion sequence as if START = STOP. In direct mode, each selected channel in the ADC_INDEX_CFG register is converted once per TRIGGER.ADC command. In auto mode, each channel selected in the ADC_INDEX_CFG register is converted once; after the last channel, the loop is repeated as long as the ADC is enabled. In auto mode, writing to TRIGGER.ADC = 1 starts the conversions. Writing TRIGGER.ADC = 0 disables the ADC after the current channel being converted finishes. In direct mode, writing TRIGGER.ADC = 1 starts the sequence. When the sequence ends, then TRIGGER.ADC is self-cleared. AFE78101, AFE88101 SLASF21 – DECEMBER 2022 www.ti.com 32 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: AFE78101 AFE88101 |
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