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ADT7410 Datasheet(PDF) 10 Page - Analog Devices |
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ADT7410 Datasheet(HTML) 10 Page - Analog Devices |
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10 / 25 page  Data Sheet ADT7410 Rev. C | Page 9 of 24 THEORY OF OPERATION CIRCUIT INFORMATION The ADT7410 is a 13-bit digital temperature sensor that is extendable to 16 bits for greater resolution. An on-board temperature sensor generates a voltage proportional to absolute temperature, which is compared to an internal voltage reference and input to a precision digital modulator. The on-board temperature sensor has excellent accuracy and linearity over the entire rated temperature range without needing correction or calibration by the user. The sensor output is digitized by a Σ-Δ modulator, also known as the charge balance type analog-to-digital converter. This type of converter uses time domain oversampling and a high accuracy comparator to deliver 16 bits of resolution in an extremely compact circuit. Configuration register functions consist of Switching between 13-bit and 16-bit resolution Switching between normal operation and full power-down Switching between comparator and interrupt event modes on the INT and CT pins Setting the active polarity of the CT and INT pins Setting the number of faults that activate CT and INT Enabling the standard one-shot mode and 1 SPS mode CONVERTER DETAILS The Σ-Δ modulator consists of an input sampler, a summing network, an integrator, a comparator, and a 1-bit DAC. This architecture creates a negative feedback loop and minimizes the integrator output by changing the duty cycle of the comparator output in response to input voltage changes. The comparator samples the output of the integrator at a much higher rate than the input sampling frequency. This oversampling spreads the quantization noise over a much wider band than that of the input signal, improving overall noise performance and increasing accuracy. The modulated output of the comparator is encoded using a circuit technique that results in I2C temperature data. Σ-∆ MODULATOR INTEGRATOR COMPARATOR TEMPERATURE VALUE REGISTER CLOCK GENERATOR LPF DIGITAL FILTER 1-BIT DAC VOLTAGE REF AND VPTAT 1-BIT 13-BIT Figure 12. Σ-Δ Modulator TEMPERATURE MEASUREMENT In normal mode, the ADT7410 runs an automatic conversion sequence. During this automatic conversion sequence, a conversion takes 240 ms to complete and the ADT7410 is continuously converting. This means that as soon as one temperature conversion is completed, another temperature conversion begins. Each temperature conversion result is stored in the temperature value registers and is available through the I2C interface. In continuous conversion mode, the read operation provides the most recent converted result. On power-up, the first conversion is a fast conversion, taking typically 6 ms. If the temperature exceeds 147°C, the CT pin asserts low. If the temperature exceeds 64°C, the INT pin asserts low. Fast conversion temperature accuracy is typically within ±5°C. The conversion clock for the part is generated internally. No external clock is required except when reading from and writing to the serial port. The measured temperature value is compared with a critical temperature limit (stored in the 16-bit TCRIT setpoint read/write register), a high temperature limit (stored in the 16-bit THIGH set- point read/write register), and a low temperature limit (stored in the 16-bit TLOW setpoint read/write register). If the measured value exceeds these limits, the INT pin is activated; and if it exceeds the TCRIT limit, the CT pin is activated. The INT and CT pins are programmable for polarity via the configuration register, and the INT and CT pins are also programmable for interrupt mode via the configuration register. |
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