The Si834x uses a rapid manipulation of switch impedance and clamp voltage for improved inductive load-driving performance and avoid the need for complicated cooling. While other solutions entering into a fault state may shut down, the Si834x switches can continue operation in a constrained but functional state with reduced channel performance, improving system availability.
The isolated switches use a logic interface with eight separate diagnostic reports, allowing control of each switch with diagnostic communication independent of the switch control signals across the isolation barrier. The diagnostics are configured, monitored and cleared through SPI or exposed on active-low, open-drain indicator pins for easy access.
Samples and production quantities of the 4-channel Si834x isolated smart switches are available now in a compact 9 mm x 9 mm DFN-32 package with an exposed centre pad (ePAD). The Si834x4x smart switch with a parallel interface is priced at $1.90 each (USD) in 100,000-unit quantities. The Si834x8x switch supporting SPI is priced at $2.09 each in 100,000-unit quantities. To simplify development and accelerate time to market, Silicon Labs offers Si834x evaluation kits with either a parallel or SPI interface and sinking/sourcing output options.