====== Pmod TMP3 Reference Manual ======
The Digilent PmodTPM3 (Revision A) is a temperature sensor module built around the [[http://www.microchip.com/wwwproducts/Devices.aspx?product=TCN75A|Microchip TCN75A]]. Users may easily measure a wide range of ambient temperatures (-40°C to +125°C) at up to 0.0625 °C of resolution. 

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== Download This Reference Manual ==
  * {{:reference:pmod:pmodtmp3:pmodtmp3_rm.pdf| PDF}}

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===== Features =====
  * Ambient temperature sensor with up to 12-bit resolution
  * Typical accuracy of ±1 °C
  * Programmable temperature alert pin
  * Multiple jumpers for eight selectable addresses
  * 30 ms to 240 ms typical conversion times
  * 2×4-pin port with I2C interface

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=====Functional Description =====
The %%Pmod TMP3%% utilizes the[[http://www.microchip.com/wwwproducts/Devices.aspx?product=TCN75A|Microchip TCN75A]] to provide users with up to 12 bits of resolution of ambient temperature data. 
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===== Interfacing with the Pmod=====
The %%Pmod TMP3%% communicates with the host board via the [[pmod:communication_protocols:i2c|I²C protocol]]. Users may select one of 8 different I²C slave addresses ranging from 0x48 to 0x4F by adjusting the jumpers JP1, JP2, and JP3 to either be at a digital '1' (3.3V) or a digital '0' (GND). A table explaining the different options is provided below:

^  JP3  ^  JP2  ^  JP1  ^  Slave 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)  |

As an I²C device, the serial clock and serial data lines (SCL and SDA, respectively) need to be pulled up to the logic high voltage level through pull-up resistors. The %%Pmod TMP3%% provides two jumper blocks, JP4, and JP5, that users can individually load to pull the two communication lines (JP4 for SDA and JP5 for SCL) up to a logic high voltage. Jumper JP6 enables a pull-up resistor to be used with the output alert pin.

To read from the %%Pmod TMP3 with its default settings of 9 bits of resolution, users will need to first write to the Pmod TMP3%% the register address of the stored data (0x00). Users may then send a restart condition and perform a read operation from the Pmod, reading in the two bytes of information. The 9-bits of temperature data are arranged in a [[:twos_complement|two's complement]] format, with the first 9 bits in the two bytes consisting of the temperature data and the remaining 7 bits as 0's.

A pinout table of the %%Pmod TMP3%% is provided below:

==== Pinout Description Table ====
^  Header J1                              |||   ^  Jumper Blocks  |||
^  Pin  ^  Signal  ^  Description           |:::^  Jumper Block  ^  State  ^  Description      |
|  1 & 5  |  SCL  |  Serial Clock           |:::|  JP1  |  3V3/GND  |  Address bit 1 high/low  |
|  2 & 6  |  SDA  |  Serial Data            |:::|  JP2  |  3V3/GND  |  Address bit 2 high/low  |
|  3 & 7  |  GND  |  Power Supply Ground    |:::|  JP3  |  3V3/GND  |  Address bit 3 high/low  |  
|  4 & 8  |  3V3  |  Positive Power Supply  |:::|  JP4  |  Enabled  |  SDA pull-up enabled  |
^  Header J2                              |||:::|  JP5  |  Enabled  |  SCL pull-up enabled  |
^  Pin  ^  Signal  ^  Description           |:::|  JP6  |  Enabled  |  Alert pull-up enabled  |
|  1  |  AL   |  Alert Pin                  |:::||||
|  2  |  GND  |  Power Supply Ground        |:::||||


Any external power applied to the %%Pmod%% must be within 2.5V and 5.5V; however, it is recommended that Pmod is operated at 3.3V.
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===== Physical Dimensions =====
The pins on the pin header are spaced 100 mil apart. The PCB is 1 inch long and 0.8 inches wide.
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===== Additional Information =====
The schematics of the %%Pmod TMP3%% are available {{reference:pmod:pmodtmp3:pmodtmp3_sch.pdf|here}}. Additional information about the %%Microchip TCN75A%% including communication modes and specific timings of the chip can be found by checking out its datasheet [[http://www.microchip.com/wwwproducts/Devices.aspx?product=TCN75A|here]]. 

Example code demonstrating how to get information from the %%Pmod TMP3%% can be found [[pmod:pmodtmp3:start#example_projects|here]]. 

If you have any questions or comments about the %%Pmod TMP3%%, feel free to post them under the appropriate section ("Add-on Boards") of the [[https://forum.digilent.com/|Digilent Forum]].