AR0141CS datasheet(28/48 Pages) ONSEMI

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AR0141CS

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Figure 31. Example of Changing the Sensor from Context A to Context B

Active Rows

Vertical Blanking

Time

1/60 s

End of Frame

Readout

End of Frame

Readout

Start of Vertical Blanking

Start of Frame

Start of Active Row

Serial SYNC Codes

End of Frame

1/60 s

1280 x 720

Frame N

HB (370 Pixels/Column)

Write context A to B

during readout of Frame N

Integration time of context

B mode implemented

during readout of frame

N+1

Context B mode is

implemented in frame N+2

1/30 s

End of Frame

Readout

Frame N + 1

Frame N + 2

1280 x 720

HB (370 Pixels/Column)

Compression

The AR0141CS can optionally compress 12−bit data to

10−bit using A−law compression. The compression is

applied after the data pedestal has been added to the data. See

“Data Pedestals”.

The A−law compression is disabled by default and can be

enabled by setting R0x31D0 from “0” to “1” and 0x31AC

needs to be set to 0x0C0A.

Table 16.

A−LAW COMPRESSION TABLE FOR 12−10 BITS

Input Range

Input Values

Compressed Codeword

0 to 127

128 to 255

256 to 511

512 to 1023

1024 to 2047

2048 to 4095

Temperature Sensor

The AR0141CS sensor has a built−in temperature sensor,

accessible through registers, that is capable of measuring die

junction temperature.

The temperature sensor can be enabled by writing

R0x30B4[0] = 1 and R0x30B4[4] =1. After this, the

temperature sensor output value can be read from

R0x30B2[9:0].

The value read out from the temperature sensor register is

an ADC output value that needs to be converted downstream

to a final temperature value in degrees Celsius. Since the

PTAT device characteristic response is quite linear in the

temperature range of operation required, a simple linear

function in the format of the equation below can be used to

convert the ADC output value to the final temperature in

degrees Celsius.

(eq. 9)

Temperature + slope

R0x30B2[9 : 0] ) T0

For this conversion, a minimum of two known points are

needed to construct the line formula by identifying the slope

and y−intercept “T0”. These calibration values can be read

from registers R0x30C6 and R0x30C8, which correspond to

value read at 105°C and 55°C respectively. Once read, the

slope and y−intercept values can be calculated and used in

Equation 9

For more information on the temperature sensor registers,

refer to the AR0141CS Register Reference.

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