TPS65910: question about PWRON pin

TS Yang

Part Number: TPS65910

Hi,

Pull down the PWRON pin after applying power to the PMIC, and all power of the PMIC will be ON.
The problem is that we does not have an external power on key or signal, so the PWRON pin keeps pulling down.
When Pull down, the power of PMIC is ON, then goes back to OFF (considered as long press off)
Pulling down the PWRON pin and releasing it will keep the power of the PMIC ON.
I have a question on how to improve the above phenomenon.

thanks,

over 7 years ago

0 Richard Solarski over 7 years ago

TI__Genius 10885 points

Hi TS,

Asserting PWRHOLD can also start the device. Figure 6-1 in the datasheet shows the internal logic for the power on conditions in the top right corner. If this is used, PWRON can be left floating.

Best Regards,
Rick S.

0 TS Yang over 7 years ago in reply to Richard Solarski

Genius 4800 points

I understood there are two ways to control the PMIC operation is controlled by the PWRON pin using the Button or the PWRHOLD pin when not using the button.
It seems to be there.

I would like to confirm only the following items.
The output of the RTC LDO (VRRTC pin) of the PMIC's output power is measured to be 1.95V higher than 1.8V.
Make sure that the output is correct.

0 Brian Berner over 7 years ago in reply to TS Yang

TI__Mastermind 30280 points

TS Yang,

Confirmed: VRTC = 1.95V is correct and acceptable.

The input voltage range for BOOT0, BOOT1, and OSC32KIN pins supplied by VRTC is: 1.65 V < VRTC < 1.95 V.
This is shown on page 11 of the datasheet in Recommended Operating Conditions.

0 TS Yang over 7 years ago in reply to Brian Berner

Genius 4800 points

Hi Brian Berner,

I checked the range of the voltage below from the datasheet.
The other voltage is almost the right level, but the VRTC voltage is high.
Is it set up internally in the PMIC?

Power management

Power management forum

TPS65910: question about PWRON pin