LFXT Module
Function
Power consumption is abnormal when
LFXT is enabled
Description
- In LQFP-44 (NNA) package, if
LFXT function is enabled, there is extra leakage of ≅6uA from VDD pin. And
due to the additional leakage, LFXT doesn't work reliably above 105C.
- In other TI-compatible
packages which support LFXT on PA3/4, if LFXT is enabled and PA26 is left
floating, there can be high leakage ≅5mA from VDD pin.
Workaround
- In LQFP-44 (NNA) package,
limit max temperature to 105C for LFXT work. And IDD_STDBY can be about
10uA.
- In other TI-compatible
packages which support LFXT on PA3/4, force PA26=0 or VDD externally on the
board.