Rainbow-electronics AT77C101B FingerChip™ Bedienungsanleitung PDF herunterladen (Seite 15)

AT77C101B

2150A–BIOM–02/02

Video Output An analog signal is also available on pins AVE and AVO. Note that video output is avail-

able one clock pulse before the corresponding digital output (one clock pipe-line delay

for the analog to digital conversion).

Pixel Order After a reset, pixel number one is located on the upper left corner, looking at the chip

with bond pads to the right. For each column of 8 pixels, pixels 1-3-5-7 are output on

odd data Do0-3 pins, pixels 2-4-6-8 are output on even data De0-3 pins. Most significant

bit is bit #3, least significant is bit #0.

Figure 11. Pixel Order

Synchronization: The

Dummy Column

A dummy column has been added to the sensor to act as a specific pattern to detect the

first pixel. So, 280 true columns + 1 dummy column are read for each frame.

The 4 bytes of the dummy column contain a fixed pattern on the two first bytes, and tem-

perature information on the last two bytes.

Note: x represents 0 or 1

The sequence 111X0000 111X0000 appears on every frame (exactly every 1124 clock

pulses), so it is an easy pattern to recognize for synchronization purposes.

B ond

ads

Pixel #1 (1,1)

Pixel #2233 (280,1)

Pixel #8 (1,8)

Pixel #2240 (280,8)

Dummy Byte Odd Even

Dummy Byte 1 DB1: 111X 0000

Dummy Byte 2 DB2: 111X 0000

Dummy Byte 3 DB3: rrrr nnnn

Dummy Byte 4 DB4: tttt pppp

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 21 22 23

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Rainbow-electronics AT77C101B FingerChip™ Bedienungsanleitung Seite 15