TLK111_14 Datasheet, PDF (11/110 Pages) Texas Instruments – PHYTER® Industrial Temperature 10/100Mbs Ethernet Physical Layer Transceiver

TLK111
www.ti.com
SLLSEF8B – AUGUST 2013 – REVISED JANUARY 2014
3.2.2 Dual Supply Operation
When a 1.55V external power rail is available, the TLK111 can be configured as shown in Figure 3-2.
PFBOUT (pin 23) is left floating. The 1.55V external supply is connected to PFBIN1 (pin 18) and PFBIN2
(pin 37). Furthermore, to lower the power consumption, the internal regulator should be powered down by
writing ‘1’ to bit 15 of the VRCR register (0x00d0h).
3.3V
Supply
Pin 22
10mF 10nF 1nF 100pF ^(AVDD33)
1.55V
Supply
Floating
Pin 23
(PFBOUT)
Pin 18
10mF 10nF 1nF 100pF ^(PFBIN1)
1.55V
Supply
Pin 37
10mF 10nF 1nF 100pF ^(PFBIN2)
Pin 13
(RD–)
Pin 14
(RD+)
3.3V
Supply
49.9 W
49.9 W
3.3V
Supply
1mF
0.1mF
1mF
1:1
RD–
RD+
Pin 16
(TD–)
Pin 17
(TD+)
Pin 32
(VDD_IO)
49.9 W
3.3V
Supply
1mF
49.9 W
0.1mF
TD–
TD+
1mF
0.1mF* ^{1:1 T1}
RJ45
100pF 1nF 10nF 10mF
IO Supply
Pin 48
(VDD_IO)
100pF 1nF 10nF 10mF
Figure 3-2. Power Connections for Dual Supply Operation
When operating with dual supplies, follow these guidelines:
• When powering up, ramp up the 3.3V supply before the 1.55V supply.
• When powering down, turn off the 1.55V supply before turning off the 3.3V supply.
• Use the external RESET pin after power up to reset the PHY.
• To use the internal power-on reset, PFBIN1 and PFBIN2 must be operational less than 100ms after
3.3V rises to detect the internal RESET.
3.2.3 Variable IO Voltage
The TLK111 digital IO pins can operate with a variable supply voltage. While the primary applications will
use 3.3V, VDD_IO can also operate on 2.5V, and for MII mode only, VDD_IO of 1.8V can be used as well.
For more details, see Section 9.5.
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Hardware Configuration
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