HMT7742 Genie IO-Link PHY transceiver IC

Time-line:

 Delivery terms: FCA Biel

Ordering information:

HMT are providing a samples service. Please enquire directly for pricing for larger quantities.

May 2009: Following successful device parametric tests at HMT and design centering, pre-series quantities are in manufacture.

News:

Configure of the microcontroller is typically carried out at product delivery via the IO Link cable.

In normal operation, the device may be run either in IO Link mode where data is transferred with UART frames, or in SIO mode where the CQ line is driven according to the sensor state. In SIO mode the outputs can be configured to be high-side, low-side or push-pull and are designed to drive capacitive, inductive and resistive loads. The output stage includes short-circuit, over temperature, surge and reverse polarisation protection.

The microcontroller now reads the incoming frame, and composes a return frame in the HMT7742 via the SPI. The HMT7742 adds parity and checksum and transmits the frame on the CQ line, using a clock trimmed to the master clock.

If the microcontroller places the HMT7742 into listen mode, or a wake-up request is generated by the IO Link master, then the HMT7742 waits for a UART frame on the CQ line. Once this is received, its checksum and parity are checked by the HMT7742, and a interrupt is generated on INT.

At start-up power is applied via the cable on VPLUS, and the microcontroller and sensor are supplied with a 3.3V or 5V supply from the HMT7742s regulator. On leaving reset the microcontroller proceeds to configure the HMT7742 to the desired operation mode.

Functional description

The GENIE IO-LINK PHY is a small format (4mm x 3mm, 12LD) physical transceiver IC for sensor and actuator devices, which handles signal driving on a 24V 3-Wire cable including internal protections (short, thermal, surge and ESD), with UART functionality for IO-Link (framing, checksum, parity) and transmission timing. It is intended to be used with an external microcontroller connected via an SPI bus.