SP5610 Datasheet, PDF (13/15 Pages) Zarlink Semiconductor Inc – 1.3GHz BI-DIRECTIONAL I2C BUS CONTROLLED SYNTHESISER

SP5610
TEST MODES
As explained earlier in the data sheet, the device can be programmed into a number of test modes. These are invoked by
programming the following HEX codes into Byte 4. The most commonly used codes are shown in Table 6
DESCRIPTION
Normal operation, REF DIV =1024
Normal operation, REF DIV = 512
Charge Pump Source (Down), FL SET to 0
Charge Pump Sink (up), FL SET to 1
Port P7 = F_PD/2
Port P7 = F_PD; P6 = F_COMP
Charge Pump Disable, REF DIV 512
Varactor Line Disable, REF DIV 512
Charge Pump and Varactor Line Disable, REF DIV 512
Table 6 Useful test modes.
HEX CODE (BYTE 4)
CP HI MODE
CC
CE
E2
E6
EA
EE
DE
CF
DF
CP LO MODE
8C
8E
A2
A6
AA
AE
9E
8F
9F
Other codes will also apply due to ‘Don’t Care’ conditions,
which are assumed to be 1 in the above Table.
NOTE:
When looking at F_PD or F_COMP signals from Ports P7 and
P6, Byte 4 should be sent twice, firstly to set the desired
reference divider ratio, (see Table 6) then secondly 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 the test
board.
11