8

Figure 8. Schematic Diagram for USB, PS/2 mouse application with ADNS-3080

Notes

•

Caps for pins 15 and 17 MUST have trace lengths LESS than 5 mm to nearest ground pin.

•

Pins 15 and 17 caps MUST use pin 16 GND.

•

Pin 9, if used, should not be connected to PCB GND to reduce potential RF emissions.

•

The 0.1 uF caps must be ceramic.

•

Caps should have less than 5 nH of self inductance.

•

Caps should have less than 0.2 Ω ESR.

•

NC pins should not be connected to any traces.

•

Surface mount parts are recommended.

•

Care must be taken when interfacing a 5V microcontroller to the ADNS-3080. Serial port inputs on the sensor should be connected to open-

drain outputs from the microcontroller or use an active drive level shifter. NPD and RESET should be connected to 5V microcontroller outputs

through a resistor divider or other level shifting technique.

•

VDD3 and GND should have low impedance connections to the power supply.

•

Capacitors connected to pin 15 and 17 should be connected to pin 16 and then to pin 19.

0.1

uF

14

10

Vcc

Vpp

9

VSS

Ceramic Resonator

Murata

CSALS 24 M 0X 53 -B 0

TDK FCR 24. 0 M 2G

17

5

V DD

LED_CTRL

SURFACE

Internal

Image

Sensor

ADNS

2120

Lens

HLMP-EG3E-xxxxx

24 MHz

8

10

OSC_OUT

OSC_IN

15

GND

24

P0.5*

3

P0.4*

4

6

MOSI

RESET

P0.2

23

1.3 K

Ω

16

15

D -

D +

Vreg

11

P1.7

P1.5

P1.4

17

18

7

Vcc

D +

D -

GND

SHLD

6 MHz

12

13

XTALIN

XTALOUT

(Optional)

6

5

P1.2

P1.0

Buttons

L

M

V DD

19

16 GND

REFB

14

P0.3

7

NPD

4

P0.7*

3

SCLK

21

P0.6

2

MISO

22

9

GUARD

11

18

20

P1.1

R

20K

Ω

20K

Ω

1

NCS

LP2950ACZ-3.3

13

REFC

2.2

uF

187

Ω

1/8 W

Vcc

Vo 3.3V

12

OPTP

20

10 K

Ω

10 K

Ω

Vcc

Vcc

QA

QB

ALPS

EC10E

Scroll Wheel

Encoder

1

2

3

20k

Ω

20k

Ω

0.1uF

4.7uF

0.1uF

Vin

Vo

GND

2

4.7uF

+

0.1uF

31

BS170

+

+

Notes:

- All capacitors close to chip

- 24MHz and 6MHz oscillators close to chip

- * Outputs configured as open drain

All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission.

PixArt Imaging Inc.

PixArt Imaging Inc.

High-Performance Optical Mouse Sensor