Texas Instruments TMP451, User'S Manual And Software Tutorial

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Chapter 2
SBOU131 – June 2013
TMP451EVM Hardware Setup
The TMP451EVM hardware consists of the SM-USB-DIG and TMP451EVM; these are easily connected
through a 10 pin board-to-board connector that should be attached to the SM-USB-DIG and TMP451EVM
PCBs. Once these two boards are connected, simply plug the USB device from the SM-USB-DIG into the
computer as shown in
Figure 2-1 .
Figure 2-1. TMP451EVM Hardware Setup
2.1 Theory of Operation for TMP451 Hardware
The TMP451EVM only requires the two-wire I
2
C™ lines (SDA and SCLK) and VDUT/GND to supply a
constant 3.3 V and power return as shown in Figure 2-2 . The TMP451EVM also has test points to monitor
these signal lines, and ground in case the user may want to use their own signals or verify I
2
C
communications.
Figure 2-2. TMP451EVM Test Board Block Diagram
2.2 Signal Definitions of H1 (10-Pin Male Connector Socket)
Table 2-1 shows the pin out for the 10-Pin connector socket used to communicate between the
TMP451EVM and the SM-DIG. It should be noted that the TMP451EVM only uses the necessary I
2
C
communication lines (pins 1 and 3) and the VDUT and GND (pin 6 and 8) pins to issue commands to the
TMP451 sensors.
7 SBOU131 – June 2013 TMP451EVM Hardware Setup
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