EPC635 datasheet(33/97 Pages) EPC

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A - B

A (UE)

B (UE)

Difference SGA - SGB and saturation detection

Integration

12-bit

ADC

Digital read-out

SAT

saturation detection

Data

SAT

SGA

SGB

SGA

DCS0: mga 0°; mgb 180°

led_mod

mga0

mgb0

Int_len

Figure 30: The 2x2 pixel group and the simplified function overview

Each pixel has its own pair of storage gates SGA and SGB. During the integration time, they accumulate the charges (e-) created by the

reflected modulated light coming from the object (see section 6., Measurement Modes). They are controlled by the mga and mgb demodu-

lation signals. After the measurement is finished, the readout phase starts. The charges stored in the storage gates SGA and SGB are

read out as a difference A – B (ambient-light suppression) and converted into a single 12-bit digital value and a 1 bit saturation flag.

Depending of the operation mode the ADC readout is different:

Differential mode:

Used for 3D TOF sine. It shows the difference of the two storage gate charges.

Digital output values are signed values.

Single-ended mode:

Used for grayscale images. It shows the charge of the selected storage gate.

For the SGA readout the conversion result is a positive 11-bit value (negative numbers are clipped).

For the SGB readout the conversion result is a positive 11-bit value (inverted value with negative numbers

clipped).

IMPORTANT:

Refer to chapter 8.7.21. for setting correct data format 2's complement integer (tcmi-data-polarity).

The application software must take care about the negative (-) single ended sample value, accordingly.

Single MGX mode (default)

When dual_mgx_mode = 0, all UE, UO, LE, LO storage gates work simultaneously during measurement operation. The storage gate con-

trol signals mga, mgb that are coming to all pixels are driven identically. In this mode, one DCS frame (0 …3) is acquired at the time (see

Figure 31).

DCS0: mga0 0°, mgb0 180°

led_mod

mga0

mgb0

Int_len

160x60 pixel

Pixel field:

Figure 31: Single MGX mode: upper and lower pixel rows are controlled identically with mgx0

Characteristics subject to change without notice

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