CS7622 datasheet(15/36 Pages) CIRRUS

Part #	CS7622

Description	CCD Imager Analog Processor

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Manufacturer	CIRRUS [Cirrus Logic]

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CS7622

DS322PP1

15

The CS7622 receives only the first 16 rising edges

of the SCLK while SEN is low and then ignores

any remaining SCLK and SDATI information. If

SEN goes high before 16 SCLK pulses have been

received, the CS7622 aborts the serial transfer.

The first bit is the R/W bit. R/W = 1 identifies the

transfer as a read. If (0), the transfer is a write. The

next seven bits define the address. For write trans-

fers, the second byte of the 16-bit packet contains

the data byte. For read transfers, the CS7622 out-

puts the read data on SDATO after accepting the

address. Address and data are transferred MSB

first. When not reading out data, the SDATO pin is

not driven by the chip (Hi-Z state).

The timing diagrams and specifications are shown

in “Serial Interface Timing Specifications” on

page 5 and Figures 1, 2, and 3 on page 5.

3.7 Input Timing for Sampling Clocks

The input clocks CK_FT and CK_DT are used to

set up the sampling times and also to generate the

internal digital clock. These clocks need to be run-

ning when processing pixels from the CCD, writing

to the chip registers, or performing calibration (See

Register Description of Operation Control 2 reg

05h bit 0 for the details of performaing a calibra-

tion). The timing of these clocks is important to en-

sure optimum settling times and sampling the

correct value. CK_FT and CK_DT need to be non-

overlapping pulses made as wide as possible to

give long settling times.

The falling edge of

CK_FT should be close to the end of feedthrough

while the falling edge of CK_DT should be close to

the end of the data section of the CCD signal. See

figure 15. Typical timing is given in table 2.

Longer non-overlapping values for T1 and T4 will

increase the recovery time, thus requiring a slower

clock rate.

Timing Parameter

Typical Operating

Values

T1, T4

2 ns

T2, T3

5 ns

Table 2.

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