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msp430f5229低功耗的问题

void halInitMCU(void)
{
     WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
    __bis_SR_register(LPM4_bits); // Enter LPM4, enable interrupts

}

初始化CPU什么都不做,进入睡眠LPM4,测试电流在2ma多,我的PCB上只焊接了一个430芯片,没有其他外围设备,请问我怎么样设置才能进入超低功耗。