CXD2422R Просмотр технического описания (PDF) - Sony Semiconductor

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CXD2422R

CCD Camera Timing Generator

Sony Semiconductor 

2) Inputting serial data

The accumulation time of the electronic shutter is controlled by external serial data.

Input pins (SD, SC, and LD) are used to input serial data.

SD: Serial data input

SC: Clock input

LD: Latch pulse input

The following is the serial data timing chart.

CXD2422R

SD

D3

D2

D1

D0

S8

S7

S6

S5

S4

S3

S2

S1

S0

SC

LD

D3 to D0: Not related to the accumulation time of the electronic shutter. Data are output to D3 to D0 pins

after converted into parallel data and being latched at LD.

S8 to S0: Sdata is set in 9-bit binary with S8 as MSB (High: 1, Low: 0). ON/OFF of the electronic shutter

and the accumulation time are determined by Sdata.

The calculation on the next page is for the accumulation time in each mode.

The data for SD are input to the internal 13-bit shift register, and the data can be retrieved as serial data at

SDO pin.

Note) The electronic shutter might operate from turning power on to inputting serial data. To prevent this

operation, process RST and LD pins as shown in the following figures. Be careful, however, as serial

data cannot be received before the voltage at RST rises.

VDD

RST 59

(with pull-up resistor)

LD 32

(with pull-up resistor)

1000p

4.7k

– 10 –

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