CHR71000 datasheet(21/54 Pages) AMSOSRAM

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CHR71000

Functional description

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7.1.1

Pixel array

The image array consists of 3.1μm x 3.1μm pinned diode pixels which share a number of

transistors (2 pixels sharing) and a rolling shutter. The default product has micro lenses on top

of the pixels. These lenses are shifted linearly towards the edges for a CRA of 22.3°.

7.1.2

Sequencer

It is provided that the sensor can be fully operated by external control signals (default start up

condition). This is a guarantee for the largest flexibility in mode of operation and possibility for

full timing optimization of the different blocks. However, we have also put a sequencer on-chip

that will generate all required control signals to operate the sensor from only a few external

control clocks. This sequencer can be activated through the SPI interface.

7.1.3

SPI interface

The SPI interface is used to load the sequencer registers with data. The data in these registers

is used by the sequencer while driving and reading out the image sensor. Features like

windowing, subsampling, gain and offset are programmed using this interface. The data in the

on-chip registers can also be read back for test and debug of the surrounding system. Chapter

7.3.2.2 contains more details on register programming and SPI timing.

7.1.4

Temperature sensor

The on-chip temperature sensor can be read out by toggling the reg_latch_temp_data bit

(register 125) from 1 to 0. When toggling this register like this, the temperature sensor data will

be latched in registers 126-127. The temperature can then be readout by retrieving the data

from the reg_temperature registers 126 and 127.

A calibration of the temperature sensor is needed for absolute temperature measurements as

the offset between devices will vary. The temperature sensor requires a running input clock

(CLK_IN), the other functions of the image sensor can be operational or in standby mode. The

output value of the sensor is dependent on the input clock. A typical temperature sensor output

vs. temperature curve at 30MHz can be found below. This results in response of about

77 DN/°C.

CHR71000 Datasheet(PDF) 21 Page - ams-OSRAM AG