APIO16/AFIO16

The AxIO16 is a radiation-hardened by design level translating I²C, SMBUS, SPI I/O expander family that is ideally suited for space, medical imaging and other applications demanding radiation tolerance and high reliability. It is fabricated in a BiCMOS process utilizing proprietary radiation-hardening techniques, delivering high resiliency to single-event effects (SEE) and to a total ionizing dose (TID) as might be found in both Low Earth Orbit (LEO) and Geostationary Earth Orbit (GEO) environments.

• Supports SPI (25MHz) and I2C (1MHz) / SMBUS
• Interface rail (VCCI) and Port rail (VCCP) operating from 1.4V to 5.5V
• Level Translation
• Internal power-on reset (POR)
• Open drain INTB pin to alert controller when inputs change
• Cold sparable I/Os with zero power penalty
• Built-in triple redundancy
• TID resilience: 30krad (Si) and 300krad (Si) variants
• SEL/SEU/SEFI immune up to LET of 75 MeV-cm²/mg
• 4 address pins yielding 16 unique I2C addresses
• 6 SEU Immune 8-bit data registers
• Flexible fast comms interface
• Built-in up/down level translation suitable for modern FPGAs (XPIO)
• Enables below-rated voltage of COTS FPGAs to mitigate SEL sensitivity
• Ensures reliable power up and power down responses during hot plug and cold sparing operations
• Fault detection and containment
• Simplifies cold sparing implementations
• Radiation-hardened against Single Event Effect (SEE)
• Suitable solutions for both LEO and GEO missions
• Allows up to 256 control channels on one 2-wire I2C bus
• Enables up to 768 bits of critical system data storage on a single I2C bus

• Expand number of I/O’s for MCUs and FPGAs
• Voltage level translation between legacy peripherals and modern FPGAs
• Health monitoring for remote systems
• Serialize peripheral monitoring signals
• Reduce harness size and weight
• Cold sparable IOs for primary redundant systems
• Wake from Interrupt (WFI) automatic processor reactivation
• Power sequencing and fault detection by monitoring power good signals
• Dynamic Voltage Scaling (DVS) with real-time power rail adjustments
• Phased-Array antenna element control
• Preserve mission critical information in power-cycled systems with rad-hard memory storage
• Basic ADCs and DACs