TLK110 Datasheet, PDF (11/104 Pages) Texas Instruments – Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer

TLK110
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SLLS901A – DECEMBER 2011 – REVISED FEBRUARY 2012
3.2.2 Dual Supply Operation
When a 1.5V external power rail is available, the TLK110 can be configured as shown in Figure 3-2.
PFBOUT (pin 23) is left floating. The 1.5V 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
Floating
Pin 22
(AVDD33)
Pin 23
(PFBOUT)
1.5V
Supply
Pin 18
(PFBIN1)
Pin 37 ^{TLK 110}
(PFBIN2)
Pin 13
(RD–)
Pin 14
(RD+)
Pin 16
(TD–)
Pin 17
(TD+)
Pin 32
(VDD33_IO)
Pin 48
(VDD33_IO)
49.9 W
49.9 W
3.3V
Supply
3.3V
Supply
0.1mF
0.1mF*
49.9 W
49.9 W
3.3V
Supply
0.1mF
3.3V
Supply
0.1mF*
1:1
RD–
RD+
1:1 T1
TD–
TD+
RJ45
Figure 3-2. Power Connections for Dual Supply Operation
When operating with multiple supplies, it is recommended that the 3.3V supply ramps up at least 200ms
before the 1.5V supply ramps up. In power down it required to shut down 1.5V supply at least 10ms
before the shutting down 3.3V supply.
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Hardware Configuration
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