SPMU387 December   2025 LMK3H2108

 

  1.   1
  2.   Read This First
    1.     About This Manual
    2.     Notational Conventions
    3.     Glossary
    4.     Related Documentation
    5.     Support Resources
    6.     Trademarks
  3. 1Configuration Overview
    1. 1.1 LMK3H2108A18 Configuration Information
  4. 2Device Register Map
  5. 3Device Registers
  6. 4Revision History

2 Device Register Map

Table 2-1 lists the memory-mapped registers for the Device registers. All register offset addresses not listed in Table 2-1 should be considered as reserved locations and the register contents should not be modified.

Table 2-1 Register Map
Offset
(Hex)		Register
Acronym		Bit
76543210
0hR0VENDOR_ID[7:0]
1hR1VENDOR_ID[15:8]
2hR2FLOAT_VDDO_6FLOAT_VDDO_5FLOAT_VDDO_3_4FLOAT_VDDO_1_2FLOAT_VDDO_0FLOAT_VDDRFLOAT_VDDXOTP_BURNT
3hR3RESGPIO1_PU_RBGPIO0_PU_RBRESFLOAT_VDDO_7
4hR4RESGPIO2_PU_RB
5hR5RESOTP_PAGE_SEL_DYN_DEBOUNCERES
6hR6I2C_REG_ADDR_FMTI2C_TRGT_ADDR
8hR8PWRGD_SAMPLE_TMR
9hR9RESSUP_LVL_RAMP_TMRPWRGD_SAMPLE_TMR_EN
AhR10GLOBAL_SUP_DET_TMR
BhR11FOD0_PDBAW_PDAUTO_FOD_PD_ENCRC_IGNOREPIN_RESAMPLE_DISOTP_AUTOLOAD_DISPDNGLOBAL_SUP_DET_TMR_EN
ChR12RESIN2_PDIN1_PDIN0_PDFOD1_PD
DhR13PWRGD_PWRDN_PIN_SELRES
EhR14RESGPI0_FUNC
FhR15RESGPI1_FUNC
10hR16RESGPI2_FUNC
11hR17RESOE_GLOBALRES
12hR18RESGPI3_FUNC
13hR19RESGPI4_FUNC
14hR20RESGPI5_FUNC
15hR21RESGPIO0_FUNC
16hR22RESGPIO1_FUNC
17hR23RESGPIO2_FUNC
18hR24RESGPIO3_FUNC
19hR25RESGPIO4_FUNC
1AhR26GPIO1_OUT_SRC_SELGPIO0_OUT_SRC_SEL
1BhR27GPIO3_OUT_SRC_SELGPIO2_OUT_SRC_SEL
1ChR28GPI3_POLARITYGPI2_POLARITYGPI1_POLARITYGPI0_POLARITYGPIO4_OUT_SRC_SEL
1DhR29GPI0_PULL_DN_ENGPIO4_POLARITYGPIO3_POLARITYGPIO2_POLARITYGPIO1_POLARITYGPIO0_POLARITYGPI5_POLARITYGPI4_POLARITY
1EhR30GPI3_PULL_DN_ENRESGPI2_PULL_UP_ENGPI2_PULL_DN_ENGPI1_PULL_UP_ENGPI1_PULL_DN_ENGPI0_PULL_UP_EN
1FhR31GPIO1_PULL_DN_ENGPIO0_PULL_UP_ENGPIO0_PULL_DN_ENGPI5_PULL_UP_ENGPI5_PULL_DN_ENGPI4_PULL_UP_ENGPI4_PULL_DN_ENGPI3_PULL_UP_EN
20hR32GPIO0_NUM_IN_LVLGPIO4_PULL_UP_ENGPIO4_PULL_DN_ENGPIO3_PULL_UP_ENGPIO3_PULL_DN_ENGPIO2_PULL_UP_ENGPIO2_PULL_DN_ENGPIO1_PULL_UP_EN
21hR33GPI3_LIVE_RBGPI2_LIVE_RBGPI1_LIVE_RBGPI0_LIVE_RBRESGPIO2_NUM_IN_LVLGPIO1_NUM_IN_LVL
22hR34GPIO2_LIVE_RBGPIO1_LIVE_RBGPIO0_LIVE_RBGPI5_LIVE_RBGPI4_LIVE_RB
23hR35RESGPIO4_GPO_VALGPIO3_GPO_VALGPIO2_GPO_VALGPIO1_GPO_VALGPIO0_GPO_VALGPIO4_LIVE_RBGPIO3_LIVE_RB
24hR36RESGPI1_OE_GRP_SELGPI0_OE_GRP_SEL
25hR37RESGPI3_OE_GRP_SELGPI2_OE_GRP_SEL
26hR38RESGPI5_OE_GRP_SELGPI4_OE_GRP_SEL
27hR39RESGPIO1_OE_GRP_SELGPIO0_OE_GRP_SEL
28hR40RESGPIO3_OE_GRP_SELGPIO2_OE_GRP_SEL
29hR41GPIO4_OUT_SIG_TYPEGPIO3_OUT_SIG_TYPEGPIO2_OUT_SIG_TYPEGPIO1_OUT_SIG_TYPEGPIO0_OUT_SIG_TYPEGPIO4_OE_GRP_SEL
2AhR42RESIN2_RCVR_FMTIN1_RCVR_FMTIN0_RCVR_FMT
2BhR43RESIN1_TERMINATION_SELIN0_TERMINATION_SEL
2ChR44IN1_LOS_THRESHIN0_LOS_THRESHIN2_LOS_ENIN1_LOS_ENIN0_LOS_ENIN2_TERMINATION_SEL
2DhR45PERST_BUF_IN0_STSPERST_BUF_IN2PERST_BUF_IN1PERST_BUF_IN0IN2_LOS_THRESH
2EhR46RESPERST_BUF_IN2_LOS_ENPERST_BUF_IN1_LOS_ENPERST_BUF_IN0_LOS_ENPERST_BUF_IN2_STSPERST_BUF_IN1_STS
2FhR47RESFOD0_N_DIV
30hR48RESFOD1_N_DIV
31hR49FOD0_NUM[7:0]
32hR50FOD0_NUM[15:8]
33hR51FOD0_NUM[23:16]
34hR52FOD1_NUM[7:0]
35hR53FOD1_NUM[15:8]
36hR54FOD1_NUM[23:16]
37hR55FOD1_CFG_UPDATEFOD0_CFG_UPDATEPATH1_DIVPATH0_DIV
39hR57RESFOD_PH_OFFSET_N_DIV
3AhR58FOD_PH_OFFSET_NUM[7:0]
3BhR59FOD_PH_OFFSET_NUM[15:8]
3ChR60RESFOD0_SSC_CONFIG_SELFOD0_SSC_MOD_TYPEFOD0_SSC_ENFOD_PH_OFFSET_FOD_SELFOD_PH_OFFSET_SHIFT_NOW
3DhR61FOD0_SSC_STEPS[7:0]
3EhR62RESFOD0_SSC_STEPS[12:8]
3FhR63FOD0_DCO_STEP_SIZE[7:0]
40hR64FOD0_DCO_STEP_SIZE[15:8]
41hR65RESFOD1_SSC_CONFIG_SELFOD1_SSC_MOD_TYPEFOD1_SSC_EN
42hR66FOD1_SSC_STEPS[7:0]
43hR67RESFOD1_SSC_STEPS[12:8]
44hR68FOD1_DCO_STEP_SIZE[7:0]
45hR69FOD1_DCO_STEP_SIZE[15:8]
46hR70RESFOD1_DCO_DECFOD1_DCO_INCFOD1_DCO_ENFOD0_DCO_DECFOD0_DCO_INCFOD0_DCO_EN
47hR71FOD0_DCO_STEPS_STAT[7:0]
48hR72FOD0_DCO_STEPS_STAT[15:8]
49hR73FOD1_DCO_STEPS_STAT[7:0]
4AhR74FOD1_DCO_STEPS_STAT[15:8]
4BhR75RESFOD0_DCO_N_DIV_STAT
4ChR76FOD0_DCO_NUM_STAT[7:0]
4DhR77FOD0_DCO_NUM_STAT[15:8]
4EhR78FOD0_DCO_NUM_STAT[23:16]
4FhR79RESFOD1_DCO_N_DIV_STAT
50hR80FOD1_DCO_NUM_STAT[7:0]
51hR81FOD1_DCO_NUM_STAT[15:8]
52hR82FOD1_DCO_NUM_STAT[23:16]
53hR83BANK1_CLK_SELBANK0_CLK_SELPATH1_EDGE_COMB_ENPATH0_EDGE_COMB_EN
54hR84RESBANK3_CLK_SELBANK2_CLK_SEL
55hR85RESBANK5_CLK_SELBANK4_CLK_SEL
56hR86BANK0_CH_DIV[7:0]
57hR87BANK0_CH_DIV[15:8]
58hR88BANK2_CH_DIVBANK1_CH_DIV
59hR89RESIN0_LOS
5AhR90BANK4_CH_DIVBANK3_CH_DIV
5BhR91PERST_BUF_BANK1PERST_BUF_BANK0BANK5_CH_DIV
5ChR92PERST_BUF_BANK5PERST_BUF_BANK4PERST_BUF_BANK3PERST_BUF_BANK2
5DhR93BANK1_AUTO_CLK_SWITCHBACK_ENBANK0_AUTO_CLK_SWITCHBACK_ENBANK5_AUTO_CLK_SWITCHOVER_ENBANK4_AUTO_CLK_SWITCHOVER_ENBANK3_AUTO_CLK_SWITCHOVER_ENBANK2_AUTO_CLK_SWITCHOVER_ENBANK1_AUTO_CLK_SWITCHOVER_ENBANK0_AUTO_CLK_SWITCHOVER_EN
5EhR94BANK3_AUTO_CLK_SWITCHOVER_CLK_SELBANK2_AUTO_CLK_SWITCHOVER_CLK_SELBANK1_AUTO_CLK_SWITCHOVER_CLK_SELBANK0_AUTO_CLK_SWITCHOVER_CLK_SELBANK5_AUTO_CLK_SWITCHBACK_ENBANK4_AUTO_CLK_SWITCHBACK_ENBANK3_AUTO_CLK_SWITCHBACK_ENBANK2_AUTO_CLK_SWITCHBACK_EN
5FhR95BANK5_CLK_SWITCHOVER_TYPEBANK4_CLK_SWITCHOVER_TYPEBANK3_CLK_SWITCHOVER_TYPEBANK2_CLK_SWITCHOVER_TYPEBANK1_CLK_SWITCHOVER_TYPEBANK0_CLK_SWITCHOVER_TYPEBANK5_AUTO_CLK_SWITCHOVER_CLK_SELBANK4_AUTO_CLK_SWITCHOVER_CLK_SEL
60hR96BANK1_SWITCHOVER_FRC_CLK_ENBANK0_SWITCHOVER_FRC_CLK_ENBANK5_CLK_DIS_ON_LOSBANK4_CLK_DIS_ON_LOSBANK3_CLK_DIS_ON_LOSBANK2_CLK_DIS_ON_LOSBANK1_CLK_DIS_ON_LOSBANK0_CLK_DIS_ON_LOS
61hR97OUT1_SLEW_RATEOUT0_SLEW_RATEBANK5_SWITCHOVER_FRC_CLK_ENBANK4_SWITCHOVER_FRC_CLK_ENBANK3_SWITCHOVER_FRC_CLK_ENBANK2_SWITCHOVER_FRC_CLK_EN
62hR98OUT5_SLEW_RATEOUT4_SLEW_RATEOUT3_SLEW_RATEOUT2_SLEW_RATE
63hR99OUT1_CMOS_SLEW_RATEOUT0_CMOS_SLEW_RATEOUT7_SLEW_RATEOUT6_SLEW_RATE
64hR100OUT5_CMOS_SLEW_RATEOUT4_CMOS_SLEW_RATEOUT3_CMOS_SLEW_RATEOUT2_CMOS_SLEW_RATE
65hR101OUT1_DIS_STATEOUT0_DIS_STATEOUT7_CMOS_SLEW_RATEOUT6_CMOS_SLEW_RATE
66hR102OUT5_DIS_STATEOUT4_DIS_STATEOUT3_DIS_STATEOUT2_DIS_STATE
67hR103OUT0_FMTRESOUT7_DIS_STATEOUT6_DIS_STATE
68hR104OUT4_FMTOUT3_FMTOUT2_FMTOUT1_FMT
69hR105RESIN1_LOS
6AhR106OUT1_CMOS_1P2V_ENOUT0_CMOS_1P2V_ENOUT7_FMTOUT6_FMTOUT5_FMT
6BhR107RESOUT7_CMOS_1P2V_ENOUT6_CMOS_1P2V_ENOUT5_CMOS_1P2V_ENOUT4_CMOS_1P2V_ENOUT3_CMOS_1P2V_ENOUT2_CMOS_1P2V_EN
6ChR108OUT1_OE_GRPOUT0_OE_GRP
6DhR109OUT3_OE_GRPOUT2_OE_GRP
6EhR110OUT5_OE_GRPOUT4_OE_GRP
6FhR111OUT7_OE_GRPOUT6_OE_GRP
70hR112OUT1_LPHCSL_VOD_SELOUT0_LPHCSL_VOD_SEL
71hR113OUT3_LPHCSL_VOD_SELOUT2_LPHCSL_VOD_SEL
72hR114OUT5_LPHCSL_VOD_SELOUT4_LPHCSL_VOD_SEL
73hR115OUT7_LPHCSL_VOD_SELOUT6_LPHCSL_VOD_SEL
74hR116OUT3_SYNC_MODEOUT2_SYNC_MODEOUT1_SYNC_MODEOUT0_SYNC_MODE
75hR117OUT7_SYNC_MODEOUT6_SYNC_MODEOUT5_SYNC_MODEOUT4_SYNC_MODE
76hR118OUT3P_OE_CMOSOUT2N_OE_CMOSOUT2P_OE_CMOSOUT1N_OE_CMOSOUT1P_OE_CMOSOUT0N_OE_CMOSOUT0P_OE_CMOSSINGLE_CMOS_EN_SYNC
77hR119OUT7P_OE_CMOSOUT6N_OE_CMOSOUT6P_OE_CMOSOUT5N_OE_CMOSOUT5P_OE_CMOSOUT4N_OE_CMOSOUT4P_OE_CMOSOUT3N_OE_CMOS
78hR120OUT6_FREQ_DET_ENOUT5_FREQ_DET_ENOUT4_FREQ_DET_ENOUT3_FREQ_DET_ENOUT2_FREQ_DET_ENOUT1_FREQ_DET_ENOUT0_FREQ_DET_ENOUT7N_OE_CMOS
79hR121RESIN2_LOS
7AhR122OUT4_FREQ_DET_THRESHOUT3_FREQ_DET_THRESHOUT2_FREQ_DET_THRESHOUT1_FREQ_DET_THRESHOUT0_FREQ_DET_THRESHRESOUT7_FREQ_DET_EN
7BhR123OUT2_AMP_DET_ENOUT1_AMP_DET_ENOUT0_AMP_DET_ENRESOUT7_FREQ_DET_THRESHOUT6_FREQ_DET_THRESHOUT5_FREQ_DET_THRESH
7ChR124OUT_AMP_DET_THRESHRESOUT7_AMP_DET_ENOUT6_AMP_DET_ENOUT5_AMP_DET_ENOUT4_AMP_DET_ENOUT3_AMP_DET_EN
7DhR125CRC_ERROR_EVT_INTR_ENIN2_LOS_LMT_EVT_INTR_ENIN1_LOS_LMT_EVT_INTR_ENIN0_LOS_LMT_EVT_INTR_ENIN2_LOS_EVT_INTR_ENIN1_LOS_EVT_INTR_ENIN0_LOS_EVT_INTR_ENDEV_INTR
7EhR126OUT3N_FREQ_ERR_EVT_INTR_ENOUT3P_FREQ_ERR_EVT_INTR_ENOUT2N_FREQ_ERR_EVT_INTR_ENOUT2P_FREQ_ERR_EVT_INTR_ENOUT1N_FREQ_ERR_EVT_INTR_ENOUT1P_FREQ_ERR_EVT_INTR_ENOUT0N_FREQ_ERR_EVT_INTR_ENOUT0P_FREQ_ERR_EVT_INTR_EN
7FhR127OUT7N_FREQ_ERR_EVT_INTR_ENOUT7P_FREQ_ERR_EVT_INTR_ENOUT6N_FREQ_ERR_EVT_INTR_ENOUT6P_FREQ_ERR_EVT_INTR_ENOUT5N_FREQ_ERR_EVT_INTR_ENOUT5P_FREQ_ERR_EVT_INTR_ENOUT4N_FREQ_ERR_EVT_INTR_ENOUT4P_FREQ_ERR_EVT_INTR_EN
80hR128OUT2N_AMP_ERR_EVT_INTR_ENOUT2P_AMP_ERR_EVT_INTR_ENOUT1N_AMP_ERR_EVT_INTR_ENOUT1P_AMP_ERR_EVT_INTR_ENOUT0N_AMP_ERR_EVT_INTR_ENOUT0P_AMP_ERR_EVT_INTR_ENRES
81hR129OUT6N_AMP_ERR_EVT_INTR_ENOUT6P_AMP_ERR_EVT_INTR_ENOUT5N_AMP_ERR_EVT_INTR_ENOUT5P_AMP_ERR_EVT_INTR_ENOUT4N_AMP_ERR_EVT_INTR_ENOUT4P_AMP_ERR_EVT_INTR_ENOUT3N_AMP_ERR_EVT_INTR_ENOUT3P_AMP_ERR_EVT_INTR_EN
82hR130RESIN2_LOS_EVTIN1_LOS_EVTIN0_LOS_EVTRESOUT7N_AMP_ERR_EVT_INTR_ENOUT7P_AMP_ERR_EVT_INTR_EN
83hR131IN1_LOS_CNTRIN0_LOS_CNTR
84hR132LOS_LMTIN2_LOS_CNTR
85hR133OUT0N_FREQ_GOODOUT0P_FREQ_GOODCRC_ERROR_EVTCRC_ERRORCRC_DONEIN2_LOS_LMT_EVTIN1_LOS_LMT_EVTIN0_LOS_LMT_EVT
86hR134OUT4N_FREQ_GOODOUT4P_FREQ_GOODOUT3N_FREQ_GOODOUT3P_FREQ_GOODOUT2N_FREQ_GOODOUT2P_FREQ_GOODOUT1N_FREQ_GOODOUT1P_FREQ_GOOD
87hR135RESOUT7N_FREQ_GOODOUT7P_FREQ_GOODOUT6N_FREQ_GOODOUT6P_FREQ_GOODOUT5N_FREQ_GOODOUT5P_FREQ_GOOD
88hR136OUT3N_FREQ_ERR_EVTOUT3P_FREQ_ERR_EVTOUT2N_FREQ_ERR_EVTOUT2P_FREQ_ERR_EVTOUT1N_FREQ_ERR_EVTOUT1P_FREQ_ERR_EVTOUT0N_FREQ_ERR_EVTOUT0P_FREQ_ERR_EVT
89hR137OUT7N_FREQ_ERR_EVTOUT7P_FREQ_ERR_EVTOUT6N_FREQ_ERR_EVTOUT6P_FREQ_ERR_EVTOUT5N_FREQ_ERR_EVTOUT5P_FREQ_ERR_EVTOUT4N_FREQ_ERR_EVTOUT4P_FREQ_ERR_EVT
8AhR138OUT2N_AMP_GOODOUT2P_AMP_GOODOUT1N_AMP_GOODOUT1P_AMP_GOODOUT0N_AMP_GOODOUT0P_AMP_GOODRES
8BhR139OUT6N_AMP_GOODOUT6P_AMP_GOODOUT5N_AMP_GOODOUT5P_AMP_GOODOUT4N_AMP_GOODOUT4P_AMP_GOODOUT3N_AMP_GOODOUT3P_AMP_GOOD
8ChR140OUT1N_AMP_ERR_EVTOUT1P_AMP_ERR_EVTOUT0N_AMP_ERR_EVTOUT0P_AMP_ERR_EVTRESOUT7N_AMP_GOODOUT7P_AMP_GOOD
8DhR141OUT5N_AMP_ERR_EVTOUT5P_AMP_ERR_EVTOUT4N_AMP_ERR_EVTOUT4P_AMP_ERR_EVTOUT3N_AMP_ERR_EVTOUT3P_AMP_ERR_EVTOUT2N_AMP_ERR_EVTOUT2P_AMP_ERR_EVT
8EhR142RESOUT7N_AMP_ERR_EVTOUT7P_AMP_ERR_EVTOUT6N_AMP_ERR_EVTOUT6P_AMP_ERR_EVT
8FhR143RESPROD_REV_ID
90hR144OTP_ID
93hR147UNLOCK_PROTECTED_REG
94hR148VDDR_SUP_LVL_DET_RBVDDX_SUP_LVL_DET_RBVDDD_SUP_LVL_DET_RBVDDA_SUP_LVL_DET_RB
95hR149VDDO_5_SUP_LVL_DET_RBVDDO_3_4_SUP_LVL_DET_RBVDDO_1_2_SUP_LVL_DET_RBVDDO_0_SUP_LVL_DET_RB
96hR150RESVDDO_7_SUP_LVL_DET_RBVDDO_6_SUP_LVL_DET_RB
99hR153RESOTP_PAGE0_SEL_CODE
9AhR154RESOTP_PAGE1_SEL_CODE
9BhR155RESOTP_PAGE2_SEL_CODE
9ChR156RESOTP_PAGE3_SEL_CODE
9DhR157OTP_PAGE_RBOTP_PAGE_SEL_CODE_RB
BBhR187CRC_COMPUTED
BChR188RESBOOTOSC_CLK_DISRES
FDhR253RESPAGE_SEL_0
13FhR319RESCLK_READY
240hR576RESOUT0_DIS
244hR580RESOUT1_DIS
248hR584RESOUT2_DIS
24ChR588RESOUT3_DIS
250hR592RESOUT4_DIS
254hR596RESOUT5_DIS
258hR600RESOUT6_DIS
25ChR604RESOUT7_DIS
270hR624RESPATH1_FOD_SELRES
2E9hR745OUT2P_INV_POLOUT1P_INV_POLOUT0P_INV_POLRES
2EAhR746OUT2N_INV_POLOUT1N_INV_POLOUT0N_INV_POLOUT7P_INV_POLOUT6P_INV_POLOUT5P_INV_POLOUT4P_INV_POLOUT3P_INV_POL
2EBhR747RESOUT7N_INV_POLOUT6N_INV_POLOUT5N_INV_POLOUT4N_INV_POLOUT3N_INV_POL
2FAhR762DIE_ID_1[7:0]
2FBhR763RESDIE_ID_1[14:8]
2FChR764DIE_ID_2[7:0]
2FEhR766DIE_ID_2[15:8]
2FFhR767DIE_ID_3[7:0]
300hR768DIE_ID_3[15:8]
302hR770STORED_CRC