10

SP5611

Normal operation, reference divider ratio = 1024

Normal operation, reference divider ratio = 512

Charge pump source (down), FL set to 0

Charge pump sink (up), FL set to 1

Charge pump disable, reference divider ratio = 512

Varactor line disable, reference divider ratio = 512

Charge pump and varactor linedisable, reference divider ratio = 512

Operation mode description

Table 5 Operation modes

Hex code (byte 4)

CP high mode

CP low mode

CC

CE

E2

E6

EA

EE

DE

CF

DF

8C

8E

A2

A6

AA

AE

9E

8F

9F

TEST MODES

As explained in the functional description, The SP5611 can

be programmed into a numb er of test modes. These are invoked

by programming Hex codes into byte 4, those most commonly

used being shown in Table 6.

Other codes will also apply due to don’t care conditions, which

are assumed to be 1 in the Table.

NOTE:

should be sent twice, first to set the desired reference division

ratio then to switch on the chosen test mode.

The pulses can then be measured by simply connecting an

oscilloscope or counter to the relevant output pin on thetest board.