Datasheet

+VBUS

CH3

CH2

CH1

CH0

GND

CANH

CANL

120

Data Logger, Motion Sensor, Temperature Sensors, CAN Transceiver, OLED, and SD Card (Schematic page 2)

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2.2.5 MCU Running Current

The microcontroller running current I

can be measured by the microcontroller itself. The output of a

Texas Instruments INA198 Current Shunt Amplifier (U15) is connected to the ADC on the microcontroller.

This amplifier increases the voltage drop on a 0.1-Ohm current shunt resistor in line with the V

source

for the microcontroller. Table 2-7 shows the signal used to measure the amplifier output.

Table 2-7. Microcontroller Running Current Signals

GPIO Pin Pin Function Amplifier

PP0 AIN23 OUT

See Current Shunt Resistors for more details on calculating the running current from the ADC readings.

2.2.6 CAN Transciever

A Texas Instruments SN65HVD1050D High-Speed CAN Transceiver is included on the development kit.

The DK-TM4C123G can easily be connected to other CAN enabled devices via the screw terminals on the

board, see Figure 2-2.

The following signals are used for CAN:

Table 2-8. CAN Transceiver Signals

GPIO Pin Pin Function CAN Transciever

PE4 CAN0RX RXD

PE5 CAN0TX TXD

The CAN bus signals from the transceiver are brought out on the screw terminals alongside the analog

channels. Depending on the position of the development kit in the network, a termination resistor may be

required. A standard 0.125 W through-hole resistor can easily be screwed into the terminals in addition to

the bus wires. For example:

Figure 2-2. Can Diagram

Hardware Description SPMU357B–August 2013–Revised March 2014

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