BQ25606: Blinking status LED

Please see my comments in the text:

Hi everyone,

I'm cureently designing a Board for charging a 18650 1S2P Battery of 5200mAh to 1 A rate, actually I power my board with a laboratory Power supply but in customer condition it will be with a 5V 2,5A .

A: What is the resistance at ICHG pin and ILIM pin? With D+/D- short, the charger recognizes the USB charge port as DCP port and set the input current limit as 2.4A regardless of ILIM resistance.  

When I Power my system (a TPS61089RNRR and the main board, for arround 3,5W of consumption) the status Led switch down and if i rise VBUS it start blinking (really faster than 1Hz) untill i rise VBUS arround 9V then status led stay ON. 

A: Are you saying when you power up charger, LED is blinking until VBUS=9V?

I've shorted D+ D- cause in this case it will not be used in USB application. 

A: If you want ILIM setting effective, you may float D+/D-.

I Have solved this situation by setting my Ichg to 500mA but if i start to use the function of my board (like bluetooth comunication) the charger stop (status of) and never restart (after stopping the BT communication)

A: Where do you connect your load at? at BAT pin or SYS pin? How did you observe charge stop?

Do you have some suggestion? 

Thanks in advance

Hi,

Thank for your replies!

I just want to note that, In this case i will use a jack power plug of 5V 2,5A, but we have planned to change the connector /cable by using a classic USB charger.  So in this case i've put 0Ohm between D+/D-. The value of Ilim is  here in the future when the USB connection will be used. 

What is the resistance at ICHG pin and ILIM pin? With D+/D- short, the charger recognize the USB charge port as DCP port and set the input current limit as 2.4A regardless of ILIM resistance.  

A: RIchd = 715 Ohms switched to 1,5K ; RIlim = 1K

Are you saying when you power up charger, LED is blinking until VBUS=9V?

Chronologicaly: - System (Buck boost TPS61089RNRR + main board) is Powered OFF. The BQ charger is powered by the power supply (5V, 2.5A)

--> Status LED is ON

- I switch K1

--> Status Start blinking fast and discontinuously.

- I rise my voltage to 9V,

--> Status go back to ON continiously.

Where do you connect your load at? at BAT pin or SYS pin? How did you observe charge stop?

As you can see in the picture it is connected to SYS pin. Status LED is OFF and my Batt voltage stop rising, and with the multimeter my tension is a little bit noisy

What are the conditions to go in Sleep mode? 

Regards