Page 18 - EngineerIt May 2021

AUTOMATION AND CONTROL

connectivity to a wide range of field
devices. When upgrading higher power
field devices, including flow meters, will
use a high performance processor, with
an integrated MAC with a 10BASE-T1L
PHY. Lower power field devices, including
temperature sensors with an ultra-low
power processor that does not have an
integrated MAC, will use a 10BASE-T1L
MAC-PHY for Ethernet connectivity via
an SPI interface to the processor (see
Figure 3).

Comparison of 10BASE-T1L PHY
and 10BASE-T1L MAC-PHY key
features
The ADIN1110, ADI’s 10BASE-T1L
MAC-PHY, enables lower power Ethernet
connectivity via an SPI interface to a host
processor with only 42 mW of power
consumption. The ADIN1110 supports
the open alliance 10BASE-T1x MAC-
PHY serial interface for full-duplex SPI
communications at 25 MHz clock speed.
The ADIN1100, ADI’s 10BASE-T1L PHY
enables low power Ethernet connectivity
Figure 1: A 10BASE-T1L MAC-PHY significantly reduces the power and complexity of via MII, RMII, and RGMII MAC interfaces
devices with advanced packet filtering. to a host processor with only 39 mW of
power consumption. See Table 1 for a
an existing device to add Ethernet hazardous area use case requirements. comparison of the ADIN1100 10BASE-
connectivity, a 10BASE-T1L MAC- 10BASE-T1L power switches and T1L PHY and ADIN1110 10BASE-T1L
PHY provides a route to re-using the 10BASE-T1L field switches require MAC-PHY. Both products are based
existing processor and adding Ethernet robust, low power 10BASE-T1L PHYs to on 10BASE-T1L core capability of a
connectivity via an SPI port, removing be used with industrial Ethernet switches full duplex, DC balanced, point-to-point
the requirement to move to a larger to deploy a trunk-and-spur network communication scheme with PAM 3
processor with an integrated MAC. topology that provides both power and modulation at a 7.5 MBd symbol rate with
For high performance applications data over a single twisted pair cable, 4B3T coding. 10BASE-T1L supports two
where a field or edge device requires a including hazardous area use cases. amplitude modes: 2.4 V peak-to-peak
high performance processor that may Field device connectivity requires up to 1000 m cable and 1.0 V peak-to-
already have an integrated MAC, a both 10BASE-T1L PHYs and 10BASE- peak at a reduced distance. The 1.0 V
10BASE-T1L PHY with MII, RMII, and T1L MAC-PHYs to enable Ethernet peak-to-peak amplitude mode means that
RGMII MAC interfaces allows a 10BASE-
T1L PHY to be quickly developed. This is
done by re-using existing MAC interface
drivers to add Ethernet connectivity (see
Figure 2).

Increased flexibility for
tomorrow’s Ethernet-connected
process installations
With the availability of both 10BASE-
T1L PHYs (ADIN1100) and 10BASE-T1L
MAC-PHYs (ADIN1110), device architects
now have increased flexibility to meet
the requirements of tomorrow’s Ethernet-
connected manufacturing installations.
Ultra -low power devices and high
performance devices can be deployed on
the same Ethernet network and comply Figure 2: Comparison of the advantages of a MAC-PHY vs. a PHY for 10BASE-T1L
with strict maximum power limitations for connectivity.

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