MSP430F4152 LPM3模式下功耗为2.5uA，与手册描述不一致

我们自己做的板子如下图所示，P1.0用于LPM3模式的唤醒。

测试代码只配置IO就直接进入LPM3模式，功耗还是有2.5uA，是否哪里未配置正确，麻烦各位大神帮忙解答解答。

WDTCTL = WDTPW + WDTHOLD;   // Stop WDT
    FLL_CTL0 |= XCAP11PF;
    bsp_io_deinit();
    while (1) {
        __bis_SR_register(LPM3_bits + GIE);       // Enter LPM3
    }

P1SEL = 0;
P1OUT = 0;
P1DIR = 0xFE;                            // All P1.x outputs

// Init Port2
P2SEL = 0x00;
P2DIR = 0xFF;                             // All P2.x outputs
P2OUT = 0;                                // All P2.x reset

// Init Port3
P3SEL = 0x00;
P3DIR = 0xFF;                             // All P3.x outputs
P3OUT = 0;                                // All P3.x reset

// Init Port4
P4SEL = 0x00;
P4DIR = 0xFF;                             // All P4.x outputs
P4OUT = 0;                                // All P4.x reset

// Init Port5
P5SEL = 0x00;
P5DIR = 0xFF;                             // All P5.x outputs
P5OUT = 0;                                // All P5.x reset

// Init Port6
P6SEL = 0x00;
P6DIR = 0xFF;                             // All P6.x outputs
P6OUT = 0;                                // All P6.x reset

// Init Port7
P7SEL = 0x00;
P7DIR = 0xFF;                             // All P7.x outputs
P7OUT = 0;                                // All P7.x reset