Data Sheet ADuM3160
Rev. C | Page 7 of 16
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
V
BUS1
1
GND
1
*
2
V
DD1
3
PDEN
4
V
BUS2
16
GND
2
*
15
V
DD2
14
SPD
13
SPU
5
PIN
12
UD–
6
DD–
11
UD+
7
DD+
10
GND
1
*
8
GND
2
*
9
ADuM3160
T
O
P VIEW
(Not to Scale)
*PIN 2 AND PIN 8
ARE INTERNAL
LY
CONNECTED TO EACH OTHER, AND IT
IS RECOMMENDED THAT BOTH PINS BE CONNECTED T
O A
COMMON GROUND.
PIN 9
AND PIN 15
ARE INTERNALL
Y CONNECTED TO EACH OTHER, AND IT
IS RECOMMENDED THAT BOTH PINS BE CONNECTED
TO
A
COMMON GROUND.
09125-003
Figure 3. Pin Configuration
Table 9. Pin Function Descriptions
Pin No. Mnemonic Direction Description
1 V
BUS1
Power
Input Power Supply for Side 1. When the isolator is powered by the USB bus voltage (4.5 V to 5.5 V),
connect the V
BUS1
pin to the USB power bus. When the isolator is powered from a 3.3 V power supply,
connect V
BUS1
to V
DD1
and to the external 3.3 V power supply. A bypass capacitor to GND
1
is required.
2 GND
1
Return
Ground 1. Ground reference for Isolator Side 1. Pin 2 and Pin 8 are internally connected to each
other, and it is recommended that both pins be connected to a common ground.
3 V
DD1
Power
Input Power Supply for Side 1. When the isolator is powered by the USB bus voltage (4.5 V to 5.5 V),
the V
DD1
pin should be used for a bypass capacitor to GND
1
. Signal lines that may require pull-up, such
as PDEN and SPU, should be tied to this pin. When the isolator is powered from a 3.3 V power supply,
connect V
BUS1
to V
DD1
and to the external 3.3 V power supply. A bypass capacitor to GND
1
is required.
4 PDEN Input
Pull-Down Enable. This pin is read when exiting reset. This pin must be connected to V
DD1
for standard
operation. If this pin is connected to GND
1
when exiting reset, the downstream pull-down resistors
are disconnected, allowing buffer impedance measurements.
5 SPU Input
Speed Select, Upstream Buffer. Active high logic input. When SPU is tied high, the full speed slew
rate, timing, and logic conventions are selected; when SPU is tied low, the low speed slew rate,
timing, and logic conventions are selected. This input must be set high via connection to V
DD1
or set
low via connection to GND
1
and must match Pin 13 (both pins tied high or both pins tied low).
6 UD− Input/Output Upstream D−.
7 UD+ Input/Output Upstream D+.
8 GND
1
Return
Ground 1. Ground reference for Isolator Side 1. Pin 2 and Pin 8 are internally connected to each
other, and it is recommended that both pins be connected to a common ground.
9 GND
2
Return
Ground 2. Ground reference for Isolator Side 2. Pin 9 and Pin 15 are internally connected to each
other, and it is recommended that both pins be connected to a common ground.
10 DD+ Input/Output Downstream D+.
11 DD− Input/Output Downstream D−.
12 PIN Input
Upstream Pull-Up Enable. PIN controls the power connection to the pull-up for the upstream port.
It can be tied to V
DD2
for operation on power-up, or it can be tied to an external control signal for an
application that requires delayed enumeration.
Speed Select, Downstream Buffer. Active high logic input. When SPD is tied high, the full speed
slew rate, timing, and logic conventions are selected; when SPD is tied low, the low speed slew rate,
timing, and logic conventions are selected. This input must be set high via connection to V
DD2
or set
low via connection to GND
2
and must match Pin 5 (both pins tied high or both pins tied low).
14 V
DD2
Power
Input Power Supply for Side 2. When the isolator is powered by the USB bus voltage (4.5 V to 5.5 V),
the V
DD2
pin should be used for a bypass capacitor to GND
2
. Signal lines that may require pull-up,
such as SPD, can be tied to this pin. When the isolator is powered from a 3.3 V power supply, connect
V
BUS2
to V
DD2
and to the external 3.3 V power supply. A bypass capacitor to GND
2
is required.
15 GND
2
Return
Ground 2. Ground reference for Isolator Side 2. Pin 9 and Pin 15 are internally connected to each
other, and it is recommended that both pins be connected to a common ground.
16 V
BUS2
Power
Input Power Supply for Side 2. When the isolator is powered by the USB bus voltage (4.5 V to 5.5 V),
connect the V
BUS2
pin to the USB power bus. When the isolator is powered from a 3.3 V power supply,
connect V
BUS2
to V
DD2
and to the external 3.3 V power supply. A bypass capacitor to GND
2
is required.
