TPS65217: shutdown

VICH formula says:

• temp3 = temp2/4.5

ICHG = (VMUX_OUT V) / (4.5 V/A) 

Volts divided by Volts over Amps = Amps.

For example, if you measure 2.25V, then ICHG = 2.25V / (4.5 V/A) = 0.5A = 500mA

Logically, this is the only conclusion that makes sense because the target charging current, ICHG, has to be within the usable voltage range of the ADC.

When ICHG[1:0] = 10b, then ICHG = 500mA and g = 4.5V/A for Gain of VICHARGE

I don't know why my text is appearing as copied code. This appears to be a bug in the e2e Text editor.

Hello Brian

thanks sir for quick reply.

DTD,

Looks like the comment is telling you the purpose of dividing by 1000 then multiplying by 10:  (10mv/0C)

I do not know the meaning of this, but it is not related to the PMIC. The PMIC output for VTS is 1 V/V (no gain). It could be related to the way NTC Resistor measurements are typically converted from voltage to temperature, but I am not an expert in this area.

If you have follow-up questions on the calculations done in software, I will re-assign this question to the AM335x team.

Many thanks  Brian for your response.
And how can you take I2C from PMIC TPS65217D RTC from AM3358zcz? I want to set the time of the operating system

Thanks & Best Regards,
DTD

DTD,

I am not sure I understand the question, because there is no integrated RTC in the TPS65217 PMIC.

The only PMIC which is compatible with Sitara AM335x and has integrated RTC is TPS65910 (variant for DDR3 is TPS65910A31, DDR3L not supported).

If you reference design is based on the BeagleBone Black, here is a simplified tutorial on adding RTC to your design:

https://learn.adafruit.com/adding-a-real-time-clock-to-beaglebone-black

Hello Brian,

Thank you very much for your note, I got confused, in cpu AM3358 has rtc pin, which means that you can install RTC devices from there.

And in AM3358 has also register RTC. But RTC is not yet installed. I can't read

Thanks & Best Regards,

DTD

Hello Brian,

You do not need to perform all of these steps manually. You simply need to set OFF=0b && PWR_EN = Low.

Set OFF=0b (Register 0x0A, bit 7):

os.system('i2cset -f -y 0 0x24 0x0A 0x80') # OFF bit set to 0b

I do not know how to re-write your code to set PWR_EN pin of PMIC low, but it must be high for the PMIC to be in the active state. You will need to figure out which GPIO is assigned as PMIC_PWR_EN and how to control the logic level of this signal.

When PWR_EN is set low (after PMIC is in ACTIVE state for min On-time of 5s), PMIC will go to OFF or SLEEP state depending on value of OFF bit in STATUS (Reg. 0x0A).

The text you are referring to in the image you provided, which says:

"DCDCx = OFF

WLED = OFF..."

Is a summary of the PMIC blocks that are enabled or disabled in this state. The PMIC enables or disables the blocks automatically depending on which state it is in, not the other way around.

Let me know if this helps.

DTD,

This e2e thread Status was changed to Open, but I do not see a new reply from you. I am changing the Status back to Closed. Let me know if you have any additional questions.