LAN9218 Datasheet, PDF (19/130 Pages) SMSC Corporation – High-Performance Single- Chip 10/100 Ethernet Controller with HP Auto-MDIX

High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX
Datasheet
Table 2.5 System and Power Signals (continued)
PIN
NO.
NAME
SYMBOL
BUFFER
TYPE
NUM
PINS
DESCRIPTION
10
RBIAS
RBIAS
AI
9
Test Pin
ATEST
I
2
Internal Regulator
VREG
P
Power
20,28, +3.3V I/O Power
VDD_IO
P
35,
42,48,
55,61,
97
19,27,
I/O Ground
GND_IO
P
34,41,
47,54,
60,96
81,85,
+3.3V Analog
VDD_A
P
89
Power
77,80, Analog Ground
VSS_A
P
86,88
3,65
Core Voltage
VDD_CORE
P
Decoupling
1,66
Core Ground
GND_CORE
P
7
PLL Power
VDD_PLL
P
4
PLL Ground
VSS_PLL
P
8
Reference Power
VDD_REF
P
11 Reference Ground
VSS_REF
P
1
PLL Bias: Connect to an external
12.0K ohm 1.0% resistor to ground.
Used for the PLL Bias circuit.
1
This pin must be connected to VDD
for normal operation.
1
3.3V input for internal voltage
regulator
8
+3.3V I/O logic power supply pins
8
Ground for I/O pins
3
+3.3V Analog power supply pins. See
Note 2.1
4
Ground for analog circuitry
2
1.8 V from internal core regulator.
Both pins must be connected
together externally and then tied to a
10uF 0.1-Ohm ESR capacitor, in
parallel with a 0.01uF capacitor to
Ground next to each pin. See
Note 2.1
2
Ground for internal digital logic
1
1.8V Power from the internal PLL
regulator. This external pin must be
connected to a 10uF 0.1-Ohm ESR
capacitor, in parallel with a 0.01uF
capacitor to Ground. See Note 2.1
1
GND for the PLL
1
Connected to 3.3v power and used
as the reference voltage for the
internal PLL
1
Ground for internal PLL reference
voltage
Note 2.1
Please refer to the SMSC application note AN 12.5x, entitled "Designing with the LAN9218
Family - Getting Started". It is also important to note that this application note applies to
the whole SMSC LAN9118 family of Ethernet controllers. However, subtle differences may
apply.
SMSC LAN9218
19
DATASHEET
Revision 1.5 (07-18-06)