Revision 1.0

Page 4 of 44

nRF24AP2-USB Product Specification

Contents

1

Introduction ............................................................................................... 6

1.1

Prerequisites ........................................................................................ 6

1.2

Writing conventions.............................................................................. 6

2

Product overview ...................................................................................... 7

2.1

Features ............................................................................................... 8

2.2

Block diagram ...................................................................................... 9

2.3

Pin Assignments .................................................................................. 10

2.4

Pin Functions ....................................................................................... 10

2.4.1

Power supply pins ........................................................................... 11

2.4.2

Reset pin ......................................................................................... 11

3

RF transceiver ........................................................................................... 12

3.1

Features ............................................................................................... 12

3.2

Block diagram ...................................................................................... 12

4

ANT overview ............................................................................................ 13

4.1

Block diagram ...................................................................................... 13

4.2

Functional description .......................................................................... 13

4.2.1

ANT nodes....................................................................................... 14

4.2.2

ANT channels .................................................................................. 14

4.2.3

ANT channel configuration .............................................................. 15

4.2.4

Proximity search .............................................................................. 17

4.2.5

Continuous scanning mode ............................................................. 18

4.2.6

ANT network topologies .................................................................. 18

4.2.7

ANT message protocol .................................................................... 19

5

Host interface ............................................................................................ 21

5.1

Features ............................................................................................... 21

5.2

Block diagram ...................................................................................... 21

5.3

Functional description .......................................................................... 21

5.3.1

Physical USB connection ................................................................ 22

5.3.2

USB enumeration ............................................................................ 22

5.3.3

USB descriptors............................................................................... 22

5.3.4

String descriptors............................................................................. 25

5.3.5

Customize descriptors ..................................................................... 25

5.3.6

Control transfer................................................................................ 26

5.3.7

Host Command flow ....................................................................... 28

6

On-chip oscillator...................................................................................... 30

6.1

Features ............................................................................................... 30

6.2

Block diagram ...................................................................................... 30

6.3

Functional description .......................................................................... 30

6.3.1

16 MHz crystal oscillator.................................................................. 30

6.3.2

External 16 MHz clock..................................................................... 31

7

Operating conditions ................................................................................ 32

8

Electrical specifications ........................................................................... 33

8.1

USB interface ....................................................................................... 34

8.2

DC Electrical characteristics ............................................................... 35