ADuM4160

Rev. C | Page 8 of 16

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

PDEN

4

16

15

14

SPD

13

SPU

5

PIN

12

UD–

6

DD–

11

UD+

7

DD+

10

9

ADuM4160

TOP VIEW

(Not to Scale)

NC = NO CONNECT

*PIN 2 AND PIN 8 ARE INTERNALLY CONNECTED, AND CONNECTING

Figure 3. Pin Configuration

Table 9. Pin Function Descriptions

Pin No.

Mnemonic Direction Description

1

V

BUS1

Power

Input Power Supply for Side 1. Where the isolator is powered by the USB bus voltage, 4.5 V to 5.5 V,

connect V

V

2

GND

1

Return

Ground 1. Ground reference for Isolator Side 1.

3

V

DD1

Power

Power Supply for Side 1. Where the isolator is powered by the USB bus voltage, 4.5 V to 5.5 V, the V

should be used for a bypass capacitor to GND

SPU, should be tied to this pin. Where the isolator is powered from a 3.3 V power supply, connect V

V

4

PDEN

Input

Pull-Down Enable. This pin is read when exiting reset. For standard operation, connect this pin to V

When connected to GND

disconnected, allowing buffer impedance measurements.

5

SPU

Input

Speed Select Upstream Buffer. Active high logic input. Selects full speed slew rate, timing, and logic

conventions when SPU is high, and low speed slew rate, timing, and logic conventions when SPU is tied

low. This input must be set high via connection to V

match Pin 13.

6

UD−

I/O

Upstream D−.

7

UD+

I/O

Upstream D+.

8

GND

1

Return

Ground 1. Ground reference for Isolator Side 1.

9

GND

2

Return

Ground 2. Ground reference for Isolator Side 2.

10

DD+

I/O

Downstream D+.

11

DD−

I/O

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

delayed enumeration.

13

SPD

Input

Speed Select Downstream Buffer. Active high logic input. Selects full speed slew rate, timing, and logic

conventions when SPD is high, and low speed slew rate, timing, and logic conventions when SPD is tied

low. This input must be set high via connection to V

Pin 5.

14

V

DD2

Power

Power Supply for Side 2. Where 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

can be tied to this pin. Where the isolator is powered from a 3.3 V power supply, connect V

and to the external 3.3 V power supply. Bypass to GND

15

GND

2

Return

Ground 2. Ground reference for Isolator Side 2.

16

V

BUS2

Power

Input Power Supply for Side 2. Where the isolator is powered by the USB bus voltage, 4.5 V to 5.5 V,

connect V

V