PSoC
®
Thermal Management Expansion Board Kit Guide, Doc. No. 001-89649 Rev. **
20
3.6 I
2
C Temperature Sensor
The CY8CKIT-036 EBK has an onboard TMP175 I
2
C temperature sensor. The TMP175 is compatible with two-wire and
SMBus interfaces and is specified for a temperature range of −40° C to +125° C. The TMP175 features three address pins,
allowing up to eight devices to be connected per bus. In the CY8CKIT-036 EBK, the three address pins (A2, A1, A0) are
tied to ground, and the sensor address is 7’b1001000. The I
2
C master (PSoC) initiates a read transaction on the I
2
C bus to
read the two-byte temperature value from the TMP175 sensor. The first byte read contains the integer part of the
temperature, and the second byte contains the fractional part of the temperature value. Refer to the TMP175 datasheet for
details on the output format, configuration options, and electrical specifications. The thermal management example projects
provided as part of the four-wire fan control application notes listed in the
Four-Wire Fan Control
section have the firmware
code to interface with a TMP175 temperature sensor.
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