iC-GF is a fully IO-Link compliant transceiver iC with two independent switching channels which enables digital sensors to drive peripheral elements, such as programmable logic controllers (PLC) and relays, for example. All functions are controlled either by pins or via SPI interface, with extended functionality and configurability in SPI mode.
The output switches can be configured for push-pull, high-side or low-side operation and share a common tri-state function (separate tri-state switching in SPI mode). The switches are designed to cope with high driver currents of at least 100mA (RSET = 6.8 k), are current limited and also short-circuit-proof in that they shut down with excessive temperature or overload. The output current limit can be easily set with a resistor at pin ISET.
The protective overload feature is accomplished in a way so that capacitive loads can be switched with low repeat rates without the protective circuitry cutting in. In the event of excess temperature an error message is generated immediately.
Errors are signalled by two open-collector outputs: NOVL (for excess temperature and overloads) and NUVD (for low voltage at VBR or VCC resp. VCC3). The output switches are shut down with all types of errors.
To avoid error signalling during power-up, the output switches remain at high impedance for ca. 50 ms. In SPI mode, the chip acts as an SPI slave and allows function configuration via register access. It also features a diagnostic register and supports communication requests (= IO-Link wake-up) at pin CFI, which generate interrupt signals at pin NDIAG.
The pins on the 24V line side of the sensor interface (VBO, QP1, QN1, QP2, QN2, VN and CFI) are protected against reverse polarity. This makes any external reverse polarity protection diodes superfluous.
iC-GF features an integrated switching converter which generates voltages VCC (5 V) and VCC3 (3.3 V) with the aid of two downstream linear regulators. For medium currents the inductor may as well be replaced by a resistor (e.g. 170), resulting though in a considerably less efficiency. If only a low current is required inductor LVH may be omitted completely; the linear regulators are then powered directly by VBR.
The switching regulator comes equipped with a spread spectrum oscillator to reduce interferences.
Input INV1 permits the input signal at channel 1 (IN1) to be inverted and if left unconnected, switches the chip into SPI mode.
The connected sensor can be parametrised using the feedback channel with a high voltage input (CFI - CFO).
• IO-Link slaves
• I/O sensor interface
• Digital sensors
• Light barriers
• Proximity switches
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