MSP430FR5962: Unexpectedly High Idle Current

Hello Brian,
the reasons for a too high current can be of course related to different things, SW and/or HW.
What kind of HW are you using?

In terms of the SW it is easier. If you use one of our tested code examples, you can be sure at least on that side. This would be e.g. one LPM3 code example on register level form our CCS Resource Explorer

"msp430fr599x_lpm3_02.c"

#include <msp430.h>

int main(void)
{
// VLOCLK, ~1s interrupts
WDTCTL = WDTPW | WDTTMSEL | WDTSSEL_2 | WDTIS_5;
SFRIE1 |= WDTIE; // Enable WDT interrupt

// Configure GPIO
P1OUT = 0;
P1DIR = 0xFF;

P2OUT = 0;
P2DIR = 0xFF;

P3OUT = 0;
P3DIR = 0xFF;

P4OUT = 0;
P4DIR = 0xFF;

P5OUT = 0;
P5DIR = 0xFF;

P6OUT = 0;
P6DIR = 0xFF;

P7OUT = 0;
P7DIR = 0xFF;

P8DIR = 0xFF;
P8OUT = 0;

PJOUT = 0;
PJDIR = 0xFFFF;

// Disable the GPIO power-on default high-impedance mode to activate
// previously configured port settings
PM5CTL0 &= ~LOCKLPM5;

// Clock System Setup
CSCTL0_H = CSKEY_H; // Unlock CS registers
CSCTL1 = DCOFSEL_0; // Set DCO to 1 MHz
CSCTL2 = SELM__DCOCLK | SELS__DCOCLK | SELA__VLOCLK;
CSCTL3 = DIVA__1 | DIVS__1 | DIVM__1; // Set all dividers to 1
CSCTL4 = LFXTOFF | HFXTOFF;
CSCTL0_H = 0; // Lock CS registers

P1DIR |= BIT0; // Turn on LED

__bis_SR_register(LPM3_bits | GIE);
__no_operation(); // For debugger
}

// Watchdog Timer interrupt service routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=WDT_VECTOR
__interrupt void WDT_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(WDT_VECTOR))) WDT_ISR (void)
#else
#error Compiler not supported!
#endif
{
P1OUT ^= BIT0; // Toggle P1.0 (LED)
}

The toggle LED should be removed for current measurements.

Best regards
Peter