STMicroelectronics' ISO808 product family includes the ISO808, ISO808A, ISO808-1, and ISO808A-1 galvanic isolated octal high side channels, extending the Intelligent Power Switch (IPS) portfolio flanking the current available ISO8200 family.
The ICs are intended to drive any industrial loads (capacitive, resistive, or inductive) with one side connected to ground (high side switch). Each IC contains two independent galvanic isolated voltage domains, VCC and VDD for the process and control logic stages, respectively. The two stages communicate through the galvanic isolation channel by an ST proprietary protocol.
Block diagram
The ISO808, ISO808A, ISO808-1, and ISO808A-1 embed STMicroelectronics' very robust galvanic isolation and are offered in PowerSO36 package. ICs differ for the control interface (parallel or serial) and for the output rating current (0.7A or 1.0A). The suffix "A" stands for serial version (control logic stage driven by 20 MHz SPI supporting daisy chaining), and the suffix "-1" stands for 1.0 A output current.
Pin connection
The ICs ISO808, ISO808A, ISO808-1, and ISO808A-1 in a PowerSO36 package integrate a galvanic isolated eight channels high side switch that can drive capacitive, resistive, or inductive loads with one side connected to ground for PLC module, industrial PC peripheral input/output, and numerical control machine
● Embedded galvanic isolation to reduce the billing of material (BOM) with insulation withstand voltage VISO 2,000 VRMS
● Isolation compliance strategy UL1577 and UL508 and Safety limits according to VDE 0844-11 (request is being started)
● Designed to meet IEC 61000-4-2, IEC 61000- 4-4, IEC 61000-4-5 and IEC 61000-4-8
● Low power dissipation due to the low RDS(ON) of 125 mΩ (typ.at +25°C) Low Power dissipation due to the low RDS(on) of 125 Mω (Typ.at +25°C)
● Fast demagnetization of inductive loads with integrated clamping (VCC - 54 V typ)
● SPI up to 20 MHz with daisy chaining (serial version A)
● Output current limitation per channel: 0.7A for ISO808/808A and 1.0A for ISO808-1/808A-1
● Eight independent protected channels
● Power good open drain output (serial versions "A")
● VCC and VDD undervoltage lockout (UVLO)
● Under voltage shutdown with auto-restart and hysteresis
● IC outputs reset function implemented if logic side VDD is in undervoltage
● Overload (OVL) and junction overtemperature (OVT) protection per channel
● Case OVT protection
● Short-circuit protection
● Ground disconnection and supply protections
● Common output enable/disable pin
● Overvoltage protection (VCC clamping 54 V typ.)
● Common fault open drain diagnostic
● VCC operating voltage range = 9.2V to 36V (process side), and VDD voltage range = 2.75V to 5.5V (logic side)
● 5 V and 3.3V TTL/CMOS and μC compatible I/Os
● Very low supply current
● Package in PowerSO-36
