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ADS7142IRUGT Datasheet(PDF) 32 Page - Texas Instruments |
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ADS7142IRUGT Datasheet(HTML) 32 Page - Texas Instruments |
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32 / 74 page  > @ k T f SCL S u 18 1000 32 ADS7142 SBAS773A – SEPTEMBER 2017 – REVISED DECEMBER 2017 www.ti.com Product Folder Links: ADS7142 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Device Functional Modes (continued) 7.4.2 Manual Mode On power-up, the device is in Manual Mode using the single ended and dual channel configuration and starts by sampling the analog input applied on Channel 0. In this mode, the device uses the high frequency oscillator for conversions. Manual mode allows the external host processor to directly request and control when the data is sampled. The data capture is initiated by an I2C command from the host processor and the data is then returned over the I2C bus at a throughput rate of up to 140-kSPS. Applications that could take advantage of this type of functionality include traditional ADC applications that require 1 or 2 channels of continuous data output. After setting the operation mode to Manual Mode as illustrated in Figure 54, steps for operating the device to be in Manual Mode and reading data are illustrated in Figure 55. The host can either configure the device to scan through one channel or both channels by configuring the CHANNEL_INPUT_CFG register and AUTO_SEQ_CFG register. 7.4.2.1 Manual Mode with CH0 Only Set the OPMODE_SEL register to 000b or 001b for Manual Mode with CH0 only. The host has to provide device address and read bit to start the conversions. To continue with conversions and reading data to the host must provide continuous SCL (Figure 56). In this mode, a NACK followed by a STOP condition in I2C frame is required to abort the operation. Then the device operation mode can be changed to another operation mode. 7.4.2.2 Manual Mode with AUTO Sequence Set the OPMODE_SEL register to 100b or 101b for Manual Mode with AUTO Sequence. The host has to set the SEQ_START bit in START_SEQUENCE register and provide the device address and read bit to start the conversions. To continue with conversions and reading data, the host must provide continuous SCL (Figure 56). In this mode, the SEQ_ABORT bit in ABORT_SEQUENCE register must be set to abort the operation. Then the device operation mode can be changed to another operation mode. In this mode, a register read aborts the AUTO sequence. In Manual Mode, the device always uses the High Speed Oscillator and the nCLK parameter has no effect. The maximum scan rate is given by Equation 7: • fs = Maximum sampling Speed in kSPS • TSCL= Time period of SCL clock (in µsec) • if TSCL-LOW (Low period of SCL) < 1.8.µsec, k = (1.8 - TSCL-LOW) and Device stretches clock in Manual Mode. Not Applicable for Standard I 2C Mode (100 kHz). • if TSCL-LOW (Low period of SCL) ≥ 1.8.µsec, k = 0 and Device does not stretch clock in Manual Mode. (7) |
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