ADNS-2220 Avago Technologies US Inc., ADNS-2220 Datasheet - Page 24

• Manufacturer Part Number: ADNS-2220
• Description: SOLID STATE OPTICAL MOUSE LENS
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-2220

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q2072083A

Notes for Motion:
1. Reading this register freezes the Delta_X and Delta_Y register values. Read this register before reading the Delta_X and Delta_Y registers. If
2. Avago Technologies RECOMMENDS that registers 0x02, 0x03 and 0x04 be read sequentially. See Motion burst mode also.
3. Internal buffers can accumulate more than eight bits of motion for X or Y. If either one of the internal buffers overflows, then absolute path data
Delta_X
Access: Read
Data Type: Eight bit 2’s complement number.
USAGE: X movement is counts since last report. Absolute value is determined by resolution. Reading clears the reg-
ister.
Delta_Y
Access: Read
Data Type: Eight bit 2’s complement number.
USAGE: Y movement is counts since last report. Absolute value is determined by resolution. Reading clears the reg-
ister.
Delta_Y
24
Delta_X
Motion
Motion
Field
Delta_X and Delta_Y are not read before the motion register is read a second time, the data in Delta_X and Delta_Y will be lost.
is lost and the OVF bit is set. This bit is cleared once some motion has been read from the Delta_X and Delta_Y registers, and if the buffers are
not at full scale. Since more data is present in the buffers, the cycle of reading the Motion, Delta_X and Delta_Y registers should be repeated
until the motion bit (MOT) is cleared. Until MOT is cleared, either the Delta_X or Delta_Y registers will read either positive or negative full scale.
If the motion register has not been read for long time, at 400 cpi it may take up to 16 read cycles to clear the buffers, at 800 cpi, up to 32 cycles.
Alternatively, writing to the Motion_Clear register (register 0x12) will clear all stored motion at once.
Field
Bit
Bit
-128
-128
80
80
X
Y
7
7
7
7
-127
-127
81
81
X
Y
6
6
6
6
FE
FE
-2
-2
X
5
Y
5
5
Address: 0x03
Reset Value: 0x00
Address: 0x04
Reset Value: 0x00
5
FF
FF
-1
-1
X
00
00
Y
4
0
0
4
4
4
+1
01
+1
01
X
Y
3
3
3
3
+2
02
+2
02
X
Y
2
2
2
2
+126
+126
7E
7E
+127
+127
X
7F
Y
1
7F
1
1
1
X
Y
0
0
0
0