TPS6594-Q1: Power up fail at low temp

Part Number: TPS6594-Q1

Dear expert,

Customer use TPS65941213 + LP876411B4RQKRQ1. 

There is one pcs system cannot power up at -20C. Need your guidance here:

Below is TPS6594 VCCA_3V3 and Buck3 output. After several retry fail, they shut down VCCA_3V3. 

Below is TPS6594 and Buck3 output zoom in.

Below is TPS6594 VCCA_3V3 and LDO

Below is TPS6594 VCCA_3V3 and LDO zoom in:

Below is LP8764 Vout and GPIO 10 output

Below is TPS6594 register dump:

DEV_REV

 

0x01

 

1

0

0

0

0

0

1

0

NVM_CODE_1

 

0x02

0

0

0

1

0

0

1

1

NVM_CODE_2

 

0x03

0

0

0

0

0

1

0

0

BUCK1_CTRL

 

0x04

0

0

1

0

0

0

0

0

BUCK1_CONF

 

0x05

0

0

1

0

1

0

1

1

BUCK2_CTRL

 

0x06

0

0

1

0

0

0

0

0

BUCK2_CONF

 

0x07

0

0

1

0

1

0

1

1

BUCK3_CTRL

 

0x08

0

0

1

0

0

0

0

0

BUCK3_CONF

 

0x09

0

0

1

0

1

1

0

1

BUCK4_CTRL

 

0x0A

0

0

1

0

0

0

0

0

BUCK4_CONF

 

0x0B

0

0

1

0

1

0

1

1

BUCK5_CTRL

 

0x0C

0

0

1

0

0

0

0

0

BUCK5_CONF

 

0x0D

0

0

0

1

1

0

1

1

BUCK1_VOUT_1

 

0x0E

0

0

1

1

0

1

1

1

BUCK1_VOUT_2

 

0x0F

0

0

1

1

0

1

1

1

BUCK2_VOUT_1

 

0x10

0

0

1

1

0

1

1

1

BUCK2_VOUT_2

 

0x11

0

0

1

1

0

1

1

1

BUCK3_VOUT_1

 

0x12

1

1

1

1

1

1

0

1

BUCK3_VOUT_2

 

0x13

1

1

1

1

1

1

0

1

BUCK4_VOUT_1

 

0x14

0

1

0

0

0

0

0

1

BUCK4_VOUT_2

 

0x15

0

1

0

0

0

0

0

1

BUCK5_VOUT_1

 

0x16

1

0

1

1

0

0

1

0

BUCK5_VOUT_2

 

0x17

1

0

1

1

0

0

1

0

BUCK1_PG_WINDOW

 

0x18

0

0

0

1

1

0

1

1

BUCK2_PG_WINDOW

 

0x19

0

0

0

1

1

0

1

1

BUCK3_PG_WINDOW

 

0x1A

0

0

1

1

1

1

1

1

BUCK4_PG_WINDOW

 

0x1B

0

0

0

1

1

0

1

1

BUCK5_PG_WINDOW

 

0x1C

0

0

0

1

1

0

1

1

LDO1_CTRL

 

0x1D

0

0

1

0

0

0

0

0

LDO2_CTRL

 

0x1E

0

0

1

0

0

0

0

0

LDO3_CTRL

 

0x1F

0

0

1

0

0

0

0

0

LDO4_CTRL

 

0x20

0

0

1

0

0

0

0

0

LDOINT_CTRL

 

0x21

0

0

0

0

0

0

0

0

LDORTC_CTRL

 

0x22

0

0

0

0

0

0

0

0

LDO1_VOUT

 

0x23

0

0

1

1

1

0

0

0

LDO2_VOUT

 

0x24

0

0

1

1

1

0

0

0

LDO3_VOUT

 

0x25

0

0

0

1

0

0

0

0

LDO4_VOUT

 

0x26

0

0

1

1

1

0

0

0

LDO1_PG_WINDOW

 

0x27

0

0

0

1

1

0

1

1

LDO2_PG_WINDOW

 

0x28

0

0

0

1

1

0

1

1

LDO3_PG_WINDOW

 

0x29

0

0

0

1

1

0

1

1

LDO4_PG_WINDOW

 

0x2A

0

0

0

1

1

0

1

1

VCCA_VMON_CTRL

 

0x2B

0

0

1

0

0

0

0

1

VCCA_PG_WINDOW

 

0x2C

0

0

1

1

1

1

1

1

GPIO1_CONF

 

0x31

0

0

1

0

0

0

0

0

GPIO2_CONF

 

0x32

0

1

0

0

0

0

0

0

GPIO3_CONF

 

0x33

0

1

0

1

1

0

0

0

GPIO4_CONF

 

0x34

1

1

0

0

1

0

0

0

GPIO5_CONF

 

0x35

0

0

1

0

1

0

0

1

GPIO6_CONF

 

0x36

0

0

1

0

1

0

0

0

GPIO7_CONF

 

0x37

0

0

1

1

1

0

0

0

GPIO8_CONF

 

0x38

0

1

1

1

1

0

0

0

GPIO9_CONF

 

0x39

0

0

0

0

0

0

0

1

GPIO10_CONF

 

0x3A

1

1

0

1

1

0

0

0

GPIO11_CONF

 

0x3B

0

1

0

0

0

0

1

1

NPWRON_CONF

 

0x3C

0

0

0

1

1

0

0

1

GPIO_OUT_1

 

0x3D

0

0

0

0

0

0

0

0

GPIO_OUT_2

 

0x3E

0

0

0

0

0

0

0

0

GPIO_IN_1

 

0x3F

0

0

0

0

0

0

0

0

GPIO_IN_2

 

0x40

0

0

0

0

1

0

0

0

RAIL_SEL_1

 

0x41

0

1

0

1

1

0

1

0

RAIL_SEL_2

 

0x42

1

0

0

1

0

1

1

0

RAIL_SEL_3

 

0x43

0

0

0

0

0

1

0

1

FSM_TRIG_SEL_1

 

0x44

0

0

0

1

1

1

1

0

FSM_TRIG_SEL_2

 

0x45

0

0

0

0

0

0

0

1

FSM_TRIG_MASK_1

 

0x46

0

1

0

1

0

1

0

1

FSM_TRIG_MASK_2

 

0x47

0

1

0

1

0

1

0

1

FSM_TRIG_MASK_3

 

0x48

0

0

0

1

0

1

0

1

MASK_BUCK1_2

 

0x49

0

0

0

0

0

0

0

0

MASK_BUCK3_4

 

0x4A

0

0

0

0

0

0

0

0

MASK_BUCK5

 

0x4B

0

0

0

0

0

0

0

0

MASK_LDO1_2

 

0x4C

0

0

0

0

0

0

0

0

MASK_LDO3_4

 

0x4D

0

0

0

0

0

0

0

0

MASK_VMON

 

0x4E

0

0

0

0

0

0

0

0

MASK_GPIO1_8_FALL

 

0x4F

1

1

1

1

1

1

1

1

MASK_GPIO1_8_RISE

 

0x50

1

1

1

1

1

1

1

1

MASK_GPIO9_11

 

0x51

0

0

1

1

1

1

1

1

MASK_STARTUP

 

0x52

0

0

0

1

0

0

0

1

MASK_MISC

 

0x53

0

0

0

0

0

0

1

0

MASK_MODERATE_ERR

 

0x54

0

0

1

0

0

0

0

0

MASK_FSM_ERR

 

0x56

0

0

0

0

0

0

0

0

MASK_COMM_ERR

 

0x57

0

0

0

0

0

0

0

0

MASK_READBACK_ERR

 

0x58

0

0

0

0

0

0

0

0

MASK_ESM

 

0x59

0

0

1

1

1

1

1

1

INT_TOP

 

0x5A

1

0

1

1

1

0

1

1

INT_BUCK

 

0x5B

0

0

0

0

0

0

1

0

INT_BUCK1_2

 

0x5C

0

0

0

0

0

0

0

0

INT_BUCK3_4

 

0x5D

0

0

0

0

0

0

1

0

INT_BUCK5

 

0x5E

0

0

0

0

0

0

0

0

INT_LDO_VMON

 

0x5F

0

0

0

0

0

0

0

1

INT_LDO1_2

 

0x60

0

0

0

0

0

1

0

0

INT_LDO3_4

 

0x61

0

0

0

0

0

0

0

0

INT_VMON

 

0x62

0

0

0

0

0

0

0

0

INT_GPIO

 

0x63

0

0

0

0

0

0

0

0

INT_GPIO1_8

 

0x64

0

0

0

0

0

0

0

0

INT_STARTUP

 

0x65

0

0

0

0

0

0

1

0

INT_MISC

 

0x66

0

0

0

0

0

0

0

1

INT_MODERATE_ERR

 

0x67

0

0

0

0

1

0

0

0

INT_SEVERE_ERR

 

0x68

0

0

0

0

0

0

0

0

INT_FSM_ERR

 

0x69

0

0

0

0

0

1

1

0

INT_COMM_ERR

 

0x6A

0

0

0

0

0

0

0

0

INT_READBACK_ERR

 

0x6B

0

0

0

0

0

0

0

0

INT_ESM

 

0x6C

0

0

0

0

0

0

0

0

STAT_BUCK1_2

 

0x6D

0

0

0

0

0

0

0

0

STAT_BUCK3_4

 

0x6E

0

0

0

0

0

0

0

0

STAT_BUCK5

 

0x6F

0

0

0

0

0

0

0

0

STAT_LDO1_2

 

0x70

0

0

0

0

0

0

0

0

STAT_LDO3_4

 

0x71

0

0

0

0

0

0

0

0

STAT_VMON

 

0x72

0

0

0

0

0

0

0

0

STAT_STARTUP

 

0x73

0

0

0

0

0

0

1

0

STAT_MISC

 

0x74

0

0

0

0

0

0

0

0

STAT_MODERATE_ERR

 

0x75

0

0

0

0

0

0

0

0

STAT_SEVERE_ERR

 

0x76

0

0

0

0

0

0

0

0

STAT_READBACK_ERR

 

0x77

0

0

0

0

0

0

0

0

PGOOD_SEL_1

 

0x78

0

0

0

0

0

0

0

0

PGOOD_SEL_2

 

0x79

0

0

0

0

0

0

0

0

PGOOD_SEL_3

 

0x7A

0

0

0

0

0

0

0

0

PGOOD_SEL_4

 

0x7B

0

0

0

0

0

0

0

0

PLL_CTRL

 

0x7C

0

0

0

0

0

0

0

0

CONFIG_1

 

0x7D

0

0

0

0

0

0

0

0

CONFIG_2

 

0x7E

0

0

0

0

0

0

0

0

ENABLE_DRV_REG

 

0x80

0

0

0

0

0

0

0

0

MISC_CTRL

 

0x81

0

0

0

0

0

1

0

0

ENABLE_DRV_STAT

 

0x82

0

0

0

1

1

0

0

0

RECOV_CNT_REG_1

 

0x83

0

0

0

0

1

1

1

1

RECOV_CNT_REG_2

 

0x84

0

0

0

0

1

1

1

1

FSM_I2C_TRIGGERS

 

0x85

0

0

0

0

0

0

0

0

FSM_NSLEEP_TRIGGERS

 

0x86

0

0

0

0

0

0

0

0

BUCK_RESET_REG

 

0x87

0

0

0

1

1

1

1

1

SPREAD_SPECTRUM_1

 

0x88

0

0

0

0

0

0

0

0

FREQ_SEL

 

0x8A

0

0

0

0

0

0

0

0

FSM_STEP_SIZE

 

0x8B

0

0

0

0

1

0

1

1

LDO_RV_TIMEOUT_REG_1

 

0x8C

1

1

1

1

1

1

1

1

LDO_RV_TIMEOUT_REG_2

 

0x8D

1

1

1

1

1

1

1

1

USER_SPARE_REGS

 

0x8E

0

0

0

0

0

0

0

0

ESM_MCU_START_REG

 

0x8F

0

0

0

0

0

0

0

0

ESM_MCU_DELAY1_REG

 

0x90

0

0

0

0

0

0

0

0

ESM_MCU_DELAY2_REG

 

0x91

0

0

0

0

0

0

0

0

ESM_MCU_MODE_CFG

 

0x92

0

0

0

0

0

0

0

0

ESM_MCU_HMAX_REG

 

0x93

0

0

0

0

0

0

0

0

ESM_MCU_HMIN_REG

 

0x94

0

0

0

0

0

0

0

0

ESM_MCU_LMAX_REG

 

0x95

0

0

0

0

0

0

0

0

ESM_MCU_LMIN_REG

 

0x96

0

0

0

0

0

0

0

0

ESM_MCU_ERR_CNT_REG

 

0x97

0

0

0

0

0

0

0

0

ESM_SOC_START_REG

 

0x98

0

0

0

0

0

0

0

0

ESM_SOC_DELAY1_REG

 

0x99

0

0

0

0

0

0

0

0

ESM_SOC_DELAY2_REG

 

0x9A

0

0

0

0

0

0

0

0

ESM_SOC_MODE_CFG

 

0x9B

0

0

0

0

0

0

0

0

ESM_SOC_HMAX_REG

 

0x9C

0

0

0

0

0

0

0

0

ESM_SOC_HMIN_REG

 

0x9D

0

0

0

0

0

0

0

0

ESM_SOC_LMAX_REG

 

0x9E

0

0

0

0

0

0

0

0

ESM_SOC_LMIN_REG

 

0x9F

0

0

0

0

0

0

0

0

ESM_SOC_ERR_CNT_REG

 

0xA0

0

0

0

0

0

0

0

0

REGISTER_LOCK

 

0xA1

0

0

0

0

0

0

0

0

USER_EE_CTRL_1

 

0xA2

0

0

0

0

0

0

0

0

USER_EE_CTRL_2

 

0xA3

1

0

0

0

0

0

0

0

SRAM_ADDR_CTRL

 

0xA4

0

0

0

0

0

0

0

0

RECOV_CNT_PFSM_INCR

 

0xA5

0

0

0

0

0

0

0

0

MANUFACTURING_VER

 

0xA6

0

0

0

0

1

0

0

0

CUSTOMER_NVM_ID_REG

 

0xA7

0

0

0

0

0

0

0

0

SOFT_REBOOT_REG

 

0xAB

0

0

0

0

0

0

0

0

RTC_SECONDS

 

0xB5

0

0

0

0

0

0

0

0

RTC_MINUTES

 

0xB6

0

0

0

0

0

0

0

0

RTC_HOURS

 

0xB7

0

0

0

0

0

0

0

0

RTC_DAYS

 

0xB8

0

0

0

0

0

0

0

1

RTC_MONTHS

 

0xB9

0

0

0

0

0

0

0

1

RTC_YEARS

 

0xBA

0

0

0

0

0

0

0

0

RTC_WEEKS

 

0xBB

0

0

0

0

0

0

0

0

ALARM_SECONDS

 

0xBC

0

0

0

0

0

0

0

0

ALARM_MINUTES

 

0xBD

0

0

0

0

0

0

0

0

ALARM_HOURS

 

0xBE

0

0

0

0

0

0

0

0

ALARM_DAYS

 

0xBF

0

0

0

0

0

0

0

0

ALARM_MONTHS

 

0xC0

0

0

0

0

0

0

0

0

ALARM_YEARS

 

0xC1

0

0

0

0

0

0

0

0

RTC_CTRL_1

 

0xC2

0

0

0

0

0

0

0

0

RTC_CTRL_2

 

0xC3

1

1

1

0

0

0

0

0

RTC_STATUS

 

0xC4

1

0

0

0

0

0

0

0

RTC_INTERRUPTS

 

0xC5

0

0

0

0

0

0

0

0

RTC_COMP_LSB

 

0xC6

0

0

0

0

0

0

0

0

RTC_COMP_MSB

 

0xC7

0

0

0

0

0

0

0

0

RTC_RESET_STATUS

 

0xC8

0

0

0

0

0

0

0

0

SCRATCH_PAD_REG_1

 

0xC9

0

0

0

0

0

0

0

0

SCRATCH_PAD_REG_2

 

0xCA

0

0

0

0

0

0

0

0

SCRATCH_PAD_REG_3

 

0xCB

0

0

0

0

0

0

0

0

SCRATCH_PAD_REG_4

 

0xCC

0

0

0

0

0

0

0

0

PFSM_DELAY_REG_1

 

0xCD

0

1

0

1

1

0

0

0

PFSM_DELAY_REG_2

 

0xCE

1

0

0

1

1

1

0

1

PFSM_DELAY_REG_3

 

0xCF

0

0

0

0

0

0

0

0

PFSM_DELAY_REG_4

 

0xD0

0

0

0

0

0

0

0

0

RTS_SPARE_REG

 

0xD1

0

0

0

0

0

0

0

0

CRC_CALC_CONTROL

 

0xEF

0

0

0

0

0

0

0

0

CRC_1

 

0xF0

0

0

0

1

0

1

1

1

CRC_2

 

0xF1

1

0

0

1

0

0

1

0

CRC_3

 

0xF2

0

1

0

1

0

0

0

0

CRC_4

 

0xF3

1

1

0

0

1

1

0

1

CRC_5

 

0xF4

1

1

1

0

0

0

0

0

CRC_6

 

0xF5

1

1

0

1

1

0

0

1

CRC_7

 

0xF6

1

0

1

1

1

0

0

1

CRC_8

 

0xF7

0

1

0

0

1

1

0

1

CRC_9

 

0xF8

1

0

0

1

1

0

1

0

CRC_10

 

0xF9

0

0

0

0

1

0

0

1

CRC_11

 

0xFA

0

1

1

0

1

0

1

1

CRC_12

 

0xFB

1

0

1

1

1

0

0

0

CRC_15

 

0xFE

1

1

1

0

0

0

1

0

CRC_16

 

0xFF

1

0

0

1

0

1

1

0

WD_ANSWER_REG

 

0x01

0

0

0

0

0

0

0

0

WD_QUESTION_ANSW_CNT

 

0x02

0

0

0

0

0

0

0

0

WD_WIN1_CFG

 

0x03

0

0

0

0

0

0

0

0

WD_WIN2_CFG

 

0x04

0

0

0

0

0

0

0

0

WD_LONGWIN_CFG

 

0x05

0

0

0

0

0

0

0

0

WD_MODE_REG

 

0x06

0

0

0

0

0

0

0

0

WD_QA_CFG

 

0x07

0

0

0

0

0

0

0

0

WD_ERR_STATUS

 

0x08

0

0

0

0

0

0

0

0

WD_THR_CFG

 

0x09

0

0

0

0

0

0

0

0

WD_FAIL_CNT_REG

 

0x0A

0

0

0

0

0

0

0

0

Below is LP8764 register dump:

NVM_CODE_1

0x02

1

0

1

1

0

1

0

0

NVM_CODE_2

0x03

0

0

0

0

0

0

0

0

BUCK1_CTRL

0x04

0

0

1

0

0

0

0

0

BUCK1_CONF

0x05

0

0

1

0

1

0

1

1

BUCK2_CTRL

0x06

0

0

1

0

0

0

0

0

BUCK2_CONF

0x07

0

0

1

0

1

0

1

1

BUCK3_CTRL

0x08

0

0

1

0

0

0

0

0

BUCK3_CONF

0x09

0

0

1

0

0

0

1

0

BUCK4_CTRL

0x0A

0

0

1

0

0

0

0

0

BUCK4_CONF

0x0B

0

0

1

0

0

0

1

0

BUCK1_VOUT_1

0x0E

0

0

1

1

0

1

1

1

BUCK1_VOUT_2

0x0F

0

0

1

1

0

1

1

1

BUCK2_VOUT_1

0x10

0

0

1

1

0

1

1

1

BUCK2_VOUT_2

0x11

0

0

1

1

0

1

1

1

BUCK3_VOUT_1

0x12

0

0

0

0

0

0

0

0

BUCK3_VOUT_2

0x13

0

0

0

0

0

0

0

0

BUCK4_VOUT_1

0x14

0

0

0

0

0

0

0

0

BUCK4_VOUT_2

0x15

0

0

0

0

0

0

0

0

BUCK1_PG_WINDOW

0x18

0

0

0

1

1

0

1

1

BUCK2_PG_WINDOW

0x19

0

0

0

1

1

0

1

1

BUCK3_PG_WINDOW

0x1A

0

0

0

0

0

0

0

0

BUCK4_PG_WINDOW

0x1B

0

0

0

0

0

0

0

0

LDOINT_CTRL

0x21

0

0

0

0

0

0

0

0

VCCA_VMON_CTRL

0x2B

0

0

1

0

0

0

0

1

VCCA_PG_WINDOW

0x2C

0

0

1

1

1

1

1

1

VMON1_PG_WINDOW

0x2D

0

0

0

0

0

0

0

0

VMON1_PG_LEVEL

0x2E

0

0

0

0

0

0

0

0

VMON2_PG_WINDOW

0x2F

0

0

0

0

0

0

0

0

VMON2_PG_LEVEL

0x30

0

0

0

0

0

0

0

0

GPIO1_CONF

0x31

0

0

0

0

0

0

0

1

GPIO2_CONF

0x32

0

0

0

0

0

0

1

1

GPIO3_CONF

0x33

0

0

0

1

1

0

0

0

GPIO4_CONF

0x34

0

0

0

1

1

0

0

0

GPIO5_CONF

0x35

0

0

0

1

1

0

0

0

GPIO6_CONF

0x36

0

0

0

1

1

0

0

0

GPIO7_CONF

0x37

0

0

0

1

1

0

0

0

GPIO8_CONF

0x38

0

0

1

0

0

0

0

0

GPIO9_CONF

0x39

0

0

1

0

0

0

0

0

GPIO10_CONF

0x3A

0

0

0

0

0

0

0

1

ENABLE_CONF

0x3C

0

0

0

0

0

0

0

0

GPIO_OUT_1

0x3D

0

0

0

0

0

0

0

0

GPIO_OUT_2

0x3E

0

0

0

0

0

0

0

0

GPIO_IN_1

0x3F

0

0

0

0

0

0

0

0

GPIO_IN_2

0x40

0

0

0

0

0

0

0

0

RAIL_SEL_1

0x41

0

0

0

0

1

0

1

0

RAIL_SEL_3

0x43

0

0

0

0

0

1

0

0

FSM_TRIG_SEL_1

0x44

0

0

0

1

1

1

1

0

FSM_TRIG_SEL_2

0x45

0

0

0

0

0

0

0

1

FSM_TRIG_MASK_1

0x46

0

1

0

1

0

1

0

1

FSM_TRIG_MASK_2

0x47

0

1

0

1

0

1

0

1

FSM_TRIG_MASK_3

0x48

0

0

0

0

0

1

0

1

MASK_BUCK1_2

0x49

0

0

0

0

0

0

0

0

MASK_BUCK3_4

0x4A

0

0

0

0

0

0

0

0

MASK_BUCK3_4

0x4A

0

0

0

0

0

0

0

0

MASK_VMON

0x4E

0

1

1

0

1

1

0

0

MASK_GPIO1_8_FALL

0x4F

1

1

1

1

1

1

1

1

MASK_GPIO1_8_RISE

0x50

1

1

1

1

1

1

1

1

MASK_GPIO9_10

0x51

0

0

0

1

1

0

1

1

MASK_STARTUP

0x52

0

0

0

1

0

0

1

0

MASK_MISC

0x53

0

0

0

0

0

0

1

0

MASK_MODERATE_ERR

0x54

1

0

0

0

0

0

0

0

MASK_FSM_ERR

0x56

1

0

0

0

0

0

0

0

MASK_COMM_ERR

0x57

1

0

1

0

0

0

0

0

MASK_READBACK_ERR

0x58

0

0

0

0

1

0

0

1

MASK_ESM

0x59

0

0

1

1

1

0

0

0

INT_TOP

0x5A

1

0

1

1

0

0

0

0

INT_BUCK

0x5B

0

0

0

0

0

0

0

0

INT_BUCK1_2

0x5C

0

0

0

0

0

0

0

0

INT_BUCK3_4

0x5D

0

0

0

0

0

0

0

0

INT_VMON

0x62

0

0

0

0

0

0

0

0

INT_GPIO

0x63

0

0

0

0

0

0

0

0

INT_GPIO1_8

0x64

0

0

0

0

0

0

0

0

INT_STARTUP

0x65

0

0

0

0

0

0

0

0

INT_MISC

0x66

0

0

0

0

0

0

0

1

INT_MODERATE_ERR

0x67

0

0

0

0

1

0

0

0

INT_SEVERE_ERR

0x68

0

0

0

0

0

0

0

0

INT_FSM_ERR

0x69

0

0

0

0

0

0

1

0

INT_COMM_ERR

0x6A

0

0

0

0

0

0

0

0

INT_READBACK_ERR

0x6B

0

0

0

0

0

0

0

0

INT_ESM

0x6C

0

0

0

0

0

0

0

0

STAT_BUCK1_2

0x6D

0

0

0

0

0

0

0

0

STAT_BUCK3_4

0x6E

0

0

0

0

0

0

0

0

STAT_VMON

0x72

0

0

0

0

0

0

0

0

STAT_STARTUP

0x73

0

0

0

0

0

0

0

0

STAT_MISC

0x74

0

0

0

0

0

0

0

0

STAT_MODERATE_ERR

0x75

0

0

0

0

0

0

0

0

STAT_SEVERE_ERR

0x76

0

0

0

0

0

0

0

0

STAT_READBACK_ERR

0x77

0

0

0

0

0

0

0

0

PGOOD_SEL_1

0x78

0

0

0

0

0

0

0

0

PGOOD_SEL_4

0x7B

0

0

0

0

0

0

0

0

PLL_CTRL

0x7C

0

0

0

0

0

0

0

0

CONFIG_1

0x7D

1

1

0

0

0

0

0

0

ENABLE_DRV_REG

0x80

0

0

0

0

0

0

0

0

MISC_CTRL

0x81

0

0

0

0

0

1

0

0

ENABLE_DRV_STAT

0x82

0

0

0

1

1

0

0

0

RECOV_CNT_REG_1

0x83

0

0

0

0

1

1

1

1

RECOV_CNT_REG_2

0x84

0

0

0

0

1

1

1

1

FSM_I2C_TRIGGERS

0x85

0

0

0

0

0

0

0

0

FSM_NSLEEP_TRIGGERS

0x86

0

0

0

0

0

0

0

0

BUCK_RESET_REG

0x87

0

0

0

0

1

1

1

1

SPREAD_SPECTRUM_1

0x88

0

0

0

0

0

0

0

0

FREQ_SEL

0x8A

0

0

0

0

0

0

0

0

FSM_STEP_SIZE

0x8B

0

0

0

0

1

0

1

1

USER_SPARE_REGS

0x8E

0

0

0

0

0

0

0

0

ESM_MCU_START_REG

0x8F

0

0

0

0

0

0

0

0

ESM_MCU_DELAY1_REG

0x90

0

0

0

0

0

0

0

0

ESM_MCU_DELAY2_REG

0x91

0

0

0

0

0

0

0

0

ESM_MCU_MODE_CFG

0x92

0

0

0

0

0

0

0

0

ESM_MCU_HMAX_REG

0x93

0

0

0

0

0

0

0

0

ESM_MCU_HMIN_REG

0x94

0

0

0

0

0

0

0

0

ESM_MCU_LMAX_REG

0x95

0

0

0

0

0

0

0

0

ESM_MCU_LMIN_REG

0x96

0

0

0

0

0

0

0

0

ESM_MCU_ERR_CNT_REG

0x97

0

0

0

0

0

0

0

0

REGISTER_LOCK

0xA1

0

0

0

0

0

0

0

0

USER_EE_CTRL_1

0xA2

0

0

0

0

0

0

0

0

USER_EE_CTRL_2

0xA3

1

0

0

0

0

0

0

0

SRAM_ADDR_CTRL

0xA4

0

0

0

0

0

0

0

0

RECOV_CNT_PFSM_INCR

0xA5

0

0

0

0

0

0

0

0

MANUFACTURING_VER

0xA6

0

0

0

0

1

0

0

0

CUSTOMER_NVM_ID_REG

0xA7

0

0

0

0

0

0

0

0

VMON_CONF

0xA8

0

0

0

0

0

0

0

0

INT_SPI_STATUS

0xA9

0

0

0

0

0

0

0

0

SOFT_REBOOT_REG

0xAB

0

0

0

0

0

0

0

0

STARTUP_CTRL

0xC3

1

1

1

0

0

0

0

0

SCRATCH_PAD_REG_1

0xC9

0

0

0

0

0

0

0

0

SCRATCH_PAD_REG_2

0xCA

0

0

0

0

0

0

0

0

SCRATCH_PAD_REG_3

0xCB

0

0

0

0

0

0

0

0

SCRATCH_PAD_REG_4

0xCC

0

0

0

0

0

0

0

0

PFSM_DELAY_REG_1

0xCD

0

0

0

0

0

0

0

0

PFSM_DELAY_REG_2

0xCE

0

0

0

1

1

1

0

1

PFSM_DELAY_REG_3

0xCF

0

0

0

0

0

0

0

0

PFSM_DELAY_REG_4

0xD0

0

0

0

0

0

0

0

0

CRC_CALC_CONTROL

0xEF

0

0

0

0

0

0

0

0

CRC_1

0xF0

0

1

0

0

1

1

0

1

CRC_2

0xF1

0

0

0

0

1

0

1

0

CRC_3

0xF2

0

1

0

1

1

0

1

0

CRC_4

0xF3

1

1

0

0

0

1

0

1

CRC_5

0xF4

1

1

0

0

1

0

0

0

CRC_6

0xF5

0

1

1

1

0

0

0

0

CRC_7

0xF6

1

0

0

0

1

1

1

1

CRC_8

0xF7

0

0

1

0

1

0

1

1

CRC_9

0xF8

1

1

1

1

1

1

1

0

CRC_10

0xF9

0

0

0

1

0

0

0

0

CRC_15

0xFE

0

1

0

0

1

0

0

0

CRC_16

0xFF

1

0

0

1

0

1

1

0

WD_ANSWER_REG

0x01

0

0

0

0

0

0

0

0

WD_QUESTION_ANSW_CNT

0x02

0

0

1

1

1

1

0

0

WD_WIN1_CFG

0x03

0

1

1

1

1

1

1

1

WD_WIN2_CFG

0x04

0

1

1

1

1

1

1

1

WD_LONGWIN_CFG

0x05

0

0

0

0

0

0

0

0

WD_MODE_REG

0x06

0

0

0

0

0

0

1

0

WD_QA_CFG

0x07

0

0

0

0

1

0

1

0

WD_ERR_STATUS

0x08

0

0

0

0

0

0

0

0

WD_THR_CFG

0x09

1

0

1

1

1

1

1

1

WD_FAIL_CNT_REG

0x0A

0

0

1

0

0

0

0

0

  • Hello Ryan,

    The register dump reads out an interrupt for BUCK3_UV and LDO1_SC on the TPS65941213. 

    In your design is FB_B3 connected to VCCA?

    Can you provide zoomed in scope shot to see if VCCA drops at during the recovery attempts?

    How low does LDO1 drop to between each recovery attempt?

  • Michael,

    Sorry for late response. Customer did some test.

    Yes, FB_B3 connect to VCCA.

    There is some small drop for VCCA.

    Below is zoom in. You can see min voltage is 3.06V which doesn't reach VCCA_UV_THR(-10%)2.97V.

    And we measured a good board for comparison.

    Below is zoom in. Min is 3.0V

    And customer optimized VCCA voltage drop from 3.06V to 3.17V for bad board. But there is still the same phenomenon.

    Is there any suggestion?

    For LDO1_SC interrupt, I think it is might due to LDO Residual Voltage Checking for several times reboot in the experiments. Do you think so?

    Thanks