EPC635 datasheet(17/97 Pages) EPC

17 / 97 page

5. Functional Description

Memory

Controller

Registers

Phase

Detector

m+n

Clock Delay

Pixel

Cont.

Seq.

Memory

I2C Slave

TCMI

160x60

Pixel Field

SCL

SDA

VDD

VDDIO

XTALOUT

XTALIN_CLKIN

PLL

CGU

ADC Read-Out

Charge

Pump

13V

EEPROM

LED Driver

LED (open-drain)

Modulator

LEDFB

De-

modulator

DATA[11:0]

DCLK

VBS

Temp.

Sensor

VSSLED

VSYNC_PSDIAG_A0

VSSIO

VSS

ROW Buffer

VDDPXH

epc635

OSC

VDDA

VSSA

SHUTTER

JTAG

HSYNC_A1

XSYNC_SAT_CFG

RGU

DLL

LED2 (push-pull)

Figure 13: Block diagram

Figure 13 shows the relations between the functional blocks with signal flow diagram.

Based on the clock and mode setup of the chip, the modulation signal is generated and output over the LED driver to the external IR LED .

Current flowing through the LED output pin can be monitored via LEDFB pin. This information is used for compensating delays generated

due to temperature changes and aging of the LED in the system. Instead of an LED, also laserdiodes (LD) can be used. An external illumi -

nation driver can be driven by the digital signal of the LED2 output.

The compensation is used for delaying the demodulation signal going into the pixel-field.

In the pixel-field, the reflecting IR light returning from the object is captured and converted to electrons which are transferred into two stor-

age gates within each pixel (MGA and MGB) depending on the phase information of the demodulation signal.

The parallel ADC blocks on top and bottom pixel-field efficiently convert and transfer the phase information to the digital domain where it

will be formatted and finally output via the TCMI for external distance calculation.

Characteristics subject to change without notice

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Datasheet_epc635-V1.02

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