Other Parts Discussed in Thread: LMX2571
Hi team,
My customer is evaluating LMX2571EVM.
About the powering down and up from CE pin as described in DS 7.3.11, my customer tried FCAL_EN=1 but it didn't work.
The POWERDOWN bit based power cycle is working correctly.
Could you please advise how to set up after CE pin going high?
The test result is shown below. The values inside parenthesis are EVM current consumption.
TCXO is external 17.92MHz. LD LED is kept same.
The written data is as attached.
①POWERDOWN bit test (succeeded)
Verify RFOUT (50.3mA)
0x001083 powered down (0.9mA)
0x000083 powered up(50.3mA)
②CE pin power down (failed)
Verify RFOUT (50.3mA)
CE=0 powered down(1mA)
CE=1 current increases (38.4mA), but no RFOUT
0x000083 further current increase, (52.6mA), but no RFOUT
All register written, output verified(50.3mA)
③Register & CE pin power down test (reference)
RFOUT verified (50.3mA)
0x001083 power down(0.9mA)
CE=0 keep power down (1mA)
CE=1 Increases current (38.4mA), No RFOUT
0x000083 Further increases current, (52.6mA) No RFOUT
All registers are written then powered up (50.3mA)
④Register & CE pin power down test (reference)
RFOUT verified (50.3mA)
CE=0 keep power down(1mA)
CE=1 Increases current (38.4mA), No RFOUT
0x001083 power down(0.9mA)
0x000083 Further increases current (36.3mA), but no RFOUT
All register written, further increases current (44.4mA), but no RFOUT
After that, it needs to turn off and on the power supply to power up again.
One more question, could you please provide table for relation between current and register values?
In TICS pro, it looks like like it duplicates from 1250uA - 2343.8uA.
Best regards,
Itoh