HLMP-ED80-XX000 AVAGO [AVAGO TECHNOLOGIES LIMITED], HLMP-ED80-XX000 Datasheet - Page 38

• Manufacturer Part Number: HLMP-ED80-XX000
• Description: Optical Mouse Sensor
• Manufacturer: AVAGO [AVAGO TECHNOLOGIES LIMITED]

Frame Rate
Clock Rate
38
The maximum value of the shutter is dependent upon the frame rate and clock
frequency. The formula for the maximum shutter value is:
Max. Shutter Value =
For a clock frequency of 18 MHz, the following table shows the maximum
shutter value. 1 clock cycle is 55.56 nsec.
Frames/second
2300
2000
1500
1000
500
Frame_Period_Lower
Access: Read/Write
Frame_Period_Upper
Access: Read/Write
Data Type: Sixteen bit 2‘s complement word.
USAGE: The frame period counter counts up until it overflows. Units are clock cycles.
The formula is:
For an 18 MHz clock, here are the Frame_Period values for popular frame rates.
Frames/second
2300*
2000*
1500
1000
500
*Note:
To optimize tracking performance on dark surfaces, it is recommended that an adaptive frame
rate based on shutter value be implemented, for frame rates greater than 1500. Changing
the frame rate results in changes in the maximum speed, acceleration limits, and dark surface
performance.
To read from the registers, read Frame_Period_Upper first followed by Frame_Period_Lower.
To write to the registers, write Frame_Period_Lower first followed by Frame_Period_Upper.
Field
Field
Bit
Bit
= Counts (decimal)
FP
FP
7
7
15
7
Counts
Decimal
7826
9000
12000
18000
36000
Clock Frequency
FP
FP
Max Shutter
Decimal
5010
6184
9184
15184
33184
6
6
Frame Rate
14
6
←
FP
FP
Hex
0x1E92
0x2328
0x2EE0
0x4650
0x8CA0
5
5
Counts (hex)
13
5
FP
FP
Hex
0x1392
0x1828
0x23E0
0x3B50
0x81A0
–2816
4
4
Address: 0x10
Reset Value: 0x20
Address: 0x11
Reset Value: 0xd1
12
4
2‘s Comp
0xE16E
0xDCD8
0xD120
0xB9B0
0x7360
←
FP
Counts (2‘s complement hex)
FP
3
3
11
3
Shutter
Upper
13
18
23
3B
81
FP
FP
2
2
10
2
Frame_Period
Upper
E1
DC
D1
B9
73
FP
FP
1
1
9
1
Lower
92
28
E0
50
A0
Lower
6E
D8
20
B0
60
FP
FP
0
0
8
0
← Minimum Frame Time
← Default Frame Time
← Default Max. Shutter