iC-GF
TRANSCEIVER
Rev C1, Page 2/26
DESCRIPTION
iC-GF is a fully IO-Link compliant transceiver iC with In SPI mode, the chip acts as an SPI slave and allows
two independent switching channels which enables function configuration via register access. It also fea-
digital sensors to drive peripheral elements, such as tures a diagnostic register and supports communica-
programmable logic controllers (PLC) and relays, for tion requests (= IO-Link wake-up) at pin CFI, which
example. All functions are controlled either by pins generate interrupt signals at pin NDIAG.
or via SPI interface, with extended functionality and
configurability in SPI mode.
The pins on the 24 V line side of the sensor inter-
face (VBO, QP1, QN1, QP2, QN2, VN and CFI) are
The output switches can be configured for push-pull, protected against reverse polarity. This makes any
high-side or low-side operation and share a common external reverse polarity protection diodes superflu-
tri-state function (separate tri-state switching in SPI ous.
mode). The switches are designed to cope with high
driver currents of at least 100 mA (RSET = 6.8 kΩ), iC-GF features an integrated switching converter
are current limited and also short-circuit-proof in that which generates voltages VCC (5 V) and VCC3
they shut down with excessive temperature or over- (3.3 V) with the aid of two downstream linear reg-
load. The output current limit can be easily set with a ulators. For medium currents the inductor may as
resistor at pin ISET.
well be replaced by a resistor (e.g. 170 Ω), result-
ing though in a considerably less efficiency. If only a
The protective overload feature is accomplished in a low current is required inductor LVH may be omitted
way so that capacitive loads can be switched with low completely; the linear regulators are then powered
repeat rates without the protective circuitry cutting in. directly by VBR.
In the event of excess temperature an error message
is generated immediately.
The switching regulator comes equipped with a
spread spectrum oscillator to reduce interferences.
Errors are signalled by two open-collector outputs:
NOVL (for excess temperature and overloads) and Input INV1 permits the input signal at channel 1 (IN1)
NUVD (for low voltage at VBR or VCC resp. VCC3). to be inverted and if left unconnected, switches the
The output switches are shut down with all types of chip into SPI mode.
errors.
The connected sensor can be parametrised using the
To avoid error signalling during power-up, the output feedback channel with a high voltage input (CFI →
switches remain at high impedance for ca. 50 ms.
CFO).
ICHAUS [ IC-HAUS GMBH ]
