WM8144-10 Wolfson Microelectronics Ltd., WM8144-10 Datasheet - Page 14

• Manufacturer Part Number: WM8144-10
• Description: Integrated 10-bit Data Acquisition System For Imaging Applications
• Manufacturer: Wolfson Microelectronics Ltd.

Data Valid Generation
The DV pin can be controlled to determine whether a DV
pulse will be generated for a particular pixel. For exam-
ple, if red pixels only are required the following DV pulse
can be generated.
Figure 9
Data Latch
Under control of the LATCHOP bit the output data bus
can be prevented from clamping until the next Data Valid
pulse. Hence the above output would become:
Figure 10
OP[9:0]
OP[9:0]
Table 4: Bit Range and Resolution Options
WM8144-10
Theory of Operation (contd.)
Table 3: Bit Allocation Assignment
14
0
0
0
1
1
DVMODE PWP1 PWP0 No. of
D
M
O
D
V
E
DV
DV
0
0
0
1
1
0
0
1
0
0
W
P
P
1
B
0
1
0
0
1
W
P
P
0
0
0
1
0
0
B7
G11 G10 G9 G8 G7 G6 G5 G4 G3 G2 G1 G0 O3 O2 O1 O0
G10 G9 G8 G7 G6 G5 G4 G3 G2 G1 G0 O4 O3 O2 O1 O0
G9 G8 G7 G6 G5 G4 G3 G2 G1 G0 O5 O4 O3 O2 O1 O0
G10 G9 G8 G7 G6 G5 G4 G3 G2 G1 G0 DV O3 O2 O1 O0
G9 G8 G7 G6 G5 G4 G3 G2 G1 G0 DV O4 O3 O2 O1 O0
R
R
B6
0
1
0
0
1
G
B5
CDATA WORD 1
offset
bits
4
5
6
4
5
B4 B3
B
offset range
-16 - 15
-32 - 31
-16 : 15
-8 : 7
-8 - 7
B2
Wolfson Microelectronics
R
R
B1
B0 B7
G
No. of gain
bits
12
11
10
11
10
B6
Output data interface
By default, data is output from the device as a ten-bit
wide word on OP[9:0]. Optionally, data can be output in
an eight-bit word format. Figure 11 shows this function.
Data is presented on pins OP[9:2] at twice pixel rate.
B5 B4
A = d9,d8,d7,d6,d5,d4,d3,d2
B = d1,d0,X,X,X,X,X,ORNG
Figure 11: Eight-bit Multiplexed Bus Output
CDATA WORD 2
range
gain
0:2
0:2
0:2
0:2
0:2
B3
resolution
steps)
(LSB
gain
0.25
0.5
0.5
B2
1
1
B1 B0
DV bits
0
0
0
1
1