FT901L-R datasheet(54/67 Pages) BRIDGETEK

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FT900

/1/2/3 Revision C Embedded Microcontroller Datasheet

Version 1.0

Document No. BRT_000172 Clearance No.: BRT#087

The FT900/1/2/3 System shall provide I/O power (+3.3V supply) on VUSB3V3 and core power (+1.2V

supply) on VCC1V2 for the USB 2.0 device / host controller. The internal band-gap gets a reference

voltage from DRREF or HRREF with an external reference resistor R (12 KΩ ±1%) respective connected

to GND.

The USB 2.0 host control will provide a +5V power voltage output for VBUS and go through the PSW_N

signal to control power switching on/off.

6.5

10/100 Mb/s Ethernet Interface

Figure 6-7 shows the 10/100 Mb/s Ethernet port configuration via the transmit (TXON & TXOP) and

receive (RXIN & RXIP) differential pair pins.

Figure 6-7 - 10/100Mbps Ethernet Interface

The FT900/1/2/3 Ethernet connection to a termination network should go through a 1:1 magnetics

transformer and an RJ-45. For space saving, the magnetics and RJ-45 may be a single integrated

component. The system shall provide +3.3V power supply for VETH3V3. The internal regulator will

generate +1.2V output on VOUT2. The EREFSET connects an external resistor R (12.3 kΩ ±1%) to GND

to provide a reference voltage for the Ethernet transceiver.

There are two Ethernet LEDs output for TX/RX transmission, Full-duplex/Half-duplex, Collision, Link or

10/100 Mb/s Speed indication. The required function should be set in the chip registers before using the

LED indicator.

RXIN (81)

RXIP (80)

RJ45

10/100 Mb/s

Ethernet

RD-

TXON (83)

TXOP (82)

GND

EREFSET (78)

FT900

ENET_LED1/GPIO5 (62)

ENET_LED0/GPIO4 (61)

VETH3V3

1:1 Magnetics

Transformer

RD+

TD-

TD+

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