The TIDA-00236 has eight digital outputs configured as low-side drivers. The design uses two DRV81646 with four protected low-side drivers integrated in each device. The on-chip shift register control logic makes it possible to control the output through SPI and also daisy chain multiple devices (in this case, two). Compared to a paralleled control approach, this saves isolation channels as one SPI channel (four lines) can control eight output channels or more. The ISO6441 provides galvanic isolation for the SPI channel. Each DRV81646 also has a global fault pin, which indicates fault on any of the four output channels. Those signals are connected to the ISO6421, which galvanic isolates the signal. LM5009 is used in a low-cost buck configuration to provide 5V to power the secondary side of the ISO6441 and ISO6421. The 5V is also used for the TLC5927 including LEDs. The LED lighting driver TLC5927 drives to two programmable status LEDs per output, 16 in total. An additional eight status LEDs are connected to the outputs of the DRV81646 and indicates the physical status of the output. The LM2936 is a low-cost low dropout (LDO) to supply the primary side of the ISO6441 and ISO6421 with 3.3V.