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OSD3358-SM-RED
– User Guide
Rev. 1.0 9/19/2017
Octavo Systems LLC
Copyright 2017
4.18
Temperature sensor hub
Figure 58: OSD3358-SM-RED temperature sensor hub circuit
The OSD3358-SM-RED Platform also has a temperature sensor hub (shown in Figure 58)
sitting on the I2C0 interface of the processor. The hub has 8 sensor inputs, out of which 4 (D1
–
D4) are brought out to header J10. An additional input D8 is used to measure temperature on
board near the SiP using Q2. The 3 remaining inputs are not routed out due to the size of the
package of the sensor hub. The hub is powered by SYS_VDD1_3P3V and can be used to
monitor thermal behavior across multiple locations of the system. More information setting up
remote measurements can be found in the temp sensor datasheet
(
http://www.ti.com/lit/ds/symlink/tmp468.pdf
). The sensor has a resolution of 13 bits (0.0625C)
and can measure temperatures ranging from -40C to 125C.
4.19
Barometer
Figure 59: OSD3358-SM-RED pressure sensor circuit
Figure 59 shows BMP280 (U22) connected to the processor on the I2C0 interface. This is a
barometric pressure sensor with a range of 300
– 1100 hPa. Along with an additional
temperature sensor, it has noise filtering circuitry that can be used to reject short term
disturbances. The sensor can measure with a 1m altitude accuracy.
