BQ4050: device does not enter SLEEP mode

Part Number:BQ4050

Hello,

I am not able to put my device into sleep mode. To detect a SLEEP mode, I watch the current consumption with an amperemeter, since I obviously cannot read the status bits (SMBC/SMBD signals wake up the device).

I measure 350 µA in the battery branch, which corresponds to the NORMAL mode.

After meeting all conditions, I cannot see a current reduction in my battery branch. I would expect it going down to some 80 µA.

SLEEP mode conditions:

- "Settings/Configuration/DA Config[SLEEP]"= 1

- "Settings/Configuration/DA Config[NR]"= 1

- "Power/Sleep/Wake Comparator" = 625 µV / 10 mR = 62.5 mA

- "Power/Sleep/Voltage Time" = 5

- "Power/Sleep/Current Time" = 20

- "Power/Sleep/Bus Timeout" = 10

- OperationStatus()[SDM] = 0

- Current() = 0 ("Power/Sleep/Sleep Current" = 10 mA)

- no Safety or PF bit is set

- when deconnecting the SMBus, there is no voltage left at SMBC & SMBD, the pins are left floating.

Any help is appreciated.

Thanks in advance.

Frank

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