AR0835HS datasheet(53/70 Pages) ONSEMI

53 / 70 page

AR0835HS: 1/3.2-Inch 8 Mp CMOS Digital Image Sensor

Gain

AR0835HS_DS Rev. D Pub. 5/15 EN

©Semiconductor Components Industries, LLC, 2015.

Gain

AR0835HS supports both analog and digital gain.

Analog gain

Analog gain is provided by colamp and ADC reference scaling (there is no ASC gain due

to column parallel nature of architecture). Only global (not per-color) coarse gain can be

set by analog gain. Global gain register (R0x305E) sets the analog gain. Bits [1:0] set the

colamp gain while bits [4:2] are reserved for ADC gain. While the 2-bit colamp gain

provides up to 4x analog gain, only LSB (bit [2]) of ADC gain bits is utilized to support 2x

ADC gain. Table 16 is the recommended gain setting:

Digital Gain

Digital gain provides both per-color and fine (sub 1x) gain. The analog and digital gains

are multiplicative to give the total gain. Digital gain is set by setting bits R0x305E[15:5] to

set global gain or by individually setting digital color gain R0x3056-C[15:5] where these

11 bits are designed in 4p7 format i.e. 4 MSB provide gain up to 15x in step of 1x while 7

LSB provide sub-1x gain with a step size of 1/128. This sub-1x gain provides the fine gain

control for the sensor.

Total Gain

Max. total gain required by design spec is 8x (analog) and 16x (digital) with min. step size

of 1/8. The total gain equation can be formulated as:

(EQ 17)

where X is 6, 8, A, C, for Gr, B, R and Gb, respectively

Note:

ON Semiconductor recommends using the registers mentioned above for gain set-

tings. Avoid R0x3028 to R0x3038 unless their mapping to above registers is well under-

stood and taken into account.

Temperature Sensor

A standalone PTAT based temperature sensor has been implemented. The block is

controlled independent of sensor timing and all communication happens through the

two-wire serial interface.

Table 16:

Recommended Analog Gain Setting

Colamp Gain Codes

(R0x305E[1:0])

ADC Gain Codes

(R0x305E[4:2])

Colamp

Gain

ADC Gain

Total

Gain

000111

000212

000313

000414

001326

001428

Total gain

dec R0x305E[1:0]



R0x305E[2]





dec R0x305X[15:5]



128

---------------------------------------------------



AR0835HS Datasheet(PDF) 53 Page - ON Semiconductor

AR0835HS Datasheet(HTML) 53 Page - ON Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70

Datasheet Download

Link URL