8

Figure 8. Schematic Diagram for USB, PS/2 mouse application with ADNS-3090

Notes

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

2. Pins 15 and 17 caps MUST use pin 16 GND.

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

4. The 0.1 uF caps must be ceramic.

5. Caps should have less than 5 nH of self inductance.

6. Caps should have less than 0.2 Ω ESR.

7. NC pins should not be connected to any traces.

8. Surface mount parts are recommended.

9. Care must be taken when interfacing a 5V microcontroller to the ADNS-3090. 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.

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

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

ADNS-3090

USB

MCU

0.1

PF

14

10

Vcc

Vpp

9

VSS

4.7

PF

Ceramic Resonator

AVX KBR -24.0-MSA

Murata CSAL24MOX040

17

5

LED_CTRL

SURFACE

Internal

Image

Sensor

ADNS

2120

Lens

HLMP-ED80

24 MHz

8

10

OSC_OUT

OSC_IN

15

GND

0.1

PF

24

P0.5

3

P0.4

4

6

MOSI

RESET

P0.2

23

1.3 K

:

16

15

D -

D +

Vreg

11

P1.7

P1.5

P1.4

Z LED

17

18

7

Vcc

D +

D -

GND

SHLD

240

:

6 MHz

12

13

XTALIN

XTALOUT

(Optional)

6

5

P1.2

P1.0

Buttons

L

M

QA

QB

Vcc

GND

19

16

GND

1 K

:

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

Notes:

All capacitors close to chip

24 MHz and 6 MHz close to chip

20

K

20

K

1

NCS

LP2950ACZ-3.3

31

2

Vo

Vin

GND

4.7

PF

0.1

PF

0.1

PF

MMBT2222A

13

REFC

2.2

PF

187

:

1/8 W

Vo

Vo 3.3V

12

OPTP

Ω

Ω

20

10 K

:

10 K

: