Data Sheet
ADT7310
Rev. A | Page 9 of 24
THEORY OF OPERATION
CIRCUIT INFORMATION
The ADT7310 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 sigma-delta (??
modulator, also known as the charge balance type analog-to-
digital converter. This type of converter utilizes 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 ??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 SPI temperature data.
? MODULATOR
INTEGRATOR
COMPARATOR
TEMPERATURE
VALUE
REGISTER
CLOCK
GENERATOR
LPF DIGITAL
FILTER
1-BIT
DAC
VOLTAGE REF
AND VPTAT
1-BIT
13-BIT
7
Figure 13. ? Modulator
TEMPERATURE MEASUREMENT
In normal mode, the ADT7310 runs an automatic conversion
sequence. During this automatic conversion sequence, a conver-
sion takes 240 ms to complete and the ADT7310 is continuously
converting. This means that as soon as one temperature conver-
sion is completed, another temperature conversion begins. Each
temperature conversion result is stored in the temperature value
register and is available through the SPI 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癈, the CT pin
asserts low. If the temperature exceeds 64癈, the INT pin asserts
low. Fast conversion temperature accuracy is typically within ?癈.
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 T
CRIT
setpoint read/write
register), a high temperature limit (stored in the 16-bit T
HIGH
setpoint 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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