ADNS3040 datasheet(13/26 Pages) HP

13 / 26 page

respond with the contents of

the Motion, Delta_Y, Delta_X,

SQUAL, Shutter_Upper,

Shutter_Lower and

Maximum_Pixel registers in

that order. The burst

transaction can be terminated

after the first 3 bytes of the

sequence are read by bringing

the NCS pin high. After

sending the register address,

the micro-controller must wait

tSRAD and then begin reading

data. All data bits can be

SCLK

Address

Data

tSWW

Write Operation

Address

Data

Write Operation

Figure 17. Timing between two write commands

Address

Data

Write Operation

Address

Next Read

Operation

SCLK

tSWR

Figure 18. Timing between write and read commands

Next Read or

Write Operation

Data

tSRAD

Read Operation

Address

tSRW & tSRR

Address

SCLK

Figure 19. Timing between read and either write or subsequent read commands

Motion_Burst Register Address

Read First Byte

First Read Operation

Read Second Byte

SCLK

tSRAD

Read Third Byte

Figure 20. Motion Burst Timing

Required timing between Read and

Write Commands

There are minimum timing

requirements between read

and write commands on the

serial port.

If the rising edge of the SCLK

for the last data bit of the

second write command occurs

before the required delay

(tSWW), then the first write

command may not complete

correctly.

If the rising edge of SCLK for

the last address bit of the read

command occurs before the

required delay (tSWR), the

write command may not

complete correctly.

During a read operation SCLK

should be delayed at least

tSRAD after the last address

data bit to ensure that the

ADNS-3040 has time to

prepare the requested data.

The falling edge of SCLK for

the first address bit of either

the read or write command

must be at least tSRR or tSRW

after the last SCLK rising edge

of the last data bit of the

previous read operation.

Burst Mode Operation

Burst mode is a special serial

port operation mode that may

be used to reduce the serial

transaction time for a motion

read. The speed improvement

is achieved by continuous data

clocking from multiple registers

without the need to specify the

requiring the normal delay

period between data bytes.

Burst mode is activated by

reading the Motion_Burst

read with no delay between

bytes by driving SCLK at the

normal rate. The data is

latched into the output buffer

after the last address bit is

received. After the burst

transmission is complete, the

micro-controller must raise the

NCS line for at least tBEXIT to

terminate burst mode. The

serial port is not available for

use until it is reset with NCS,

even for a second burst

transmission.

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