Figure 2-2 VBAT and GND Connections

VBAT is the external power supply for the board (typically 12V). VBAT can be connected to the DC Barrel Jack BJ2. After VBAT passes through a reverse-polarity protection diode, VBAT is called VSUP. The polarity protection diode can be bypassed by connection the input power directly to TP2.

VSUP and VSUPB are separated by an EMI pi-filter. To bypass the EMI filter, install a zero-ohm resistor at position R82.

VHSS and VSUP are connected together on the EVM via a zero-ohm resistor at position R83 and can be separated by removing R83.

Figure 2-3 5V LDO Regulator U3

VSUP supplies a 5V LDO that is a utility voltage for the board peripherals, such as LEDs, and can also supply VCAN. Using J6, this LDO can either be disabled or enabled. The enable signal source is easily selectable as either a pull-up to VCC2 or a pull-up to VSUP. The 5V rail is available on header J5. If the LDO is disabled, the 5V rail can be externally supplied via J5 or BJ4.

VCAN can be shunted to the 5V LDO or to VCC2 using J7.

Figure 2-4 VCC1, VCC2, VLED, and VSEL

VSEL can be connected to ground by flipping the switch to the ON position. In the OFF position, the VSEL pin is floating, resulting in a 3.3V output from VCC1.

VCC1 integrated buck regulator output from TCAN24xx-Q1 is available on J23 or TP5. The VCC2 integrated LDO regulator output from TCAN24xx-Q1 is available on J24 or TP8.

Each power rail has an LED indicator that is sourced through the 5V LED input supply, which can be connected to BJ3 if not being sourced from BJ4 or U3 via the J25 header.