Digilent 410-287P - Manual (Page 3)

PmodTMP3 Reference Manual
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Page 3 of 3
JP3 JP2 JP1 Address
GND GND GND 0x48 (0b1001000)
GND GND 3V3 0x49 (0b1001001)
GND 3V3 GND 0x4A (0b1001010)
GND 3V3 3V3 0x4B (0b1001011)
3V3 GND GND 0x4C (0b1001100)
3V3 GND 3V3 0x4D (0b1001101)
3V3 3V3 GND 0x4E (0b1001110)
3V3 3V3 3V3 0x4F (0b1001111)
Addresses
4 Open Drain Output
The PmodTMP3 provides a single open-drain header for controlling external devices based on current temperature
thresholds. When the ambient temperature surpasses the value contained in the T
SET
register, an alert can be
signaled on the AL pin of header J2. The alert may be active low or high based upon the configuration of the device
and the state of JP6. Shorting JP6 pulls up the AL pin by a 2.2kOhm resistor when it is not driven by the device. The
alert signal may be configured to act as a comparator output or as an interrupt.
5 Quickstart Operation
When the PmodTMP3 is powered up, the onboard TCN75AVUA is in a mode that may be used as a temperature
sensor without any initial configuration. The default mode of operation provides a continuous conversion, 9-bit
resolution, and an active-low, comparator output alert. On power-up, the TCN75AVUA register pointer points to
the Temperature register, so a two byte read without specifying a register will read the value of the temperature
from the device from most significant byte (MSB) to least significant byte (LSB). For 9-bit resolution, the
temperature in degrees Celsius may be calculated as a floating point value by shifting the temperature register
data to the right seven bits and multiplying by 0.5.
For more information on the TCN75AVUA and reading or writing to other registers on the device, please refer to
the TCN75AVUA datasheet available at
www.microchip.com .