SJA1105 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet Rev. 1 — 7 November 2016 25 of 34
NXP Semiconductors
SJA1105
5-port automotive Ethernet switch
Port 1 to Port 4 are configured for MII/RMII operation, so a 3.3 V supply is connected to
pins VDDIO_MII1 to VDDIO_MII4. A 2.5 V supply is connected to VDDIO_MII1 since it is
configured for RGMII operation.
The SPI, JTAG and PTP_CLK interfaces are supplied via VDDIO_HOST. The 25 MHz
clock output, CLK_OUT, is supplied from VDDIO_CLO. Both VDDIO_HOST and
VDDIO_CLO accept a 1.8 V, 2.5 V or 3.3 V supply.
SJA1105 devices can be cascaded, as illustrated in Figure 14
. Note that Ethernet
connectivity to the host processor is only needed if the system has to support AVB
operation or other bridge management protocols such as STP/RSTP. If such operations
are not needed, all the ports can be used for data traffic.
In Crystal oscillator mode, the SJA1105 oscillator is used as a crystal oscillator with an
external 25 MHz crystal and, typically, a 2 8 pF load. In Clock mode, the SJA1105
oscillator is used as a clock input with an external clock connected to input terminal
OSC_IN with OSC_OUT left open.
