Starterware/AM3359: PMIC TPS 65910 Booting Issue

Any body facing same problem please reply

Please post the schematic part containing PMIC and processor connections.

Sir,

By using debug statements I found that while transmitting data to PMIC TPS65910 via I2C , it is resetting the device.

The exact point where it is resetting the device is

Is Starterware bootloader code.

 In main() function

In BlPlatformConfig(); function

In ConfigVddOpVoltage(); function

In SelectI2CInstance(PMIC_DEVCTRL_REG_SR_CTL_I2C_SEL_CTL_I2C); function

In SetupI2CTransmit(2);

while  execution of I2CMasterDataPut(SOC_I2C_0_REGS, dataToSlave[tCount++]); function it is resetting the device

One more thing, sometimes it is executing fine and sometimes it is resetting.

what can be the possible reason for resetting the device ?

Thanks and Regards

Raja

Please post the EXACT part number of the PMIC you are using.

The PMIC we are using is TPS65910A3.

Thanks and Regards

Raja

Schematic part containing PMIC and processor connections

 

Thanks and Regards

Raja

Does the above errors can cause reset while transferring data via I2C to PMIC, because I can read data of PMIC registers. While writing data to registers it is causing reset that too sometimes it is working fine and sometimes it is not working.

Why is it going to reset while data transfer is occurring ? How to debug it?

Sir,
We have cross checked our schematic few instructions are missing in the attached images, Please see the below information. As per our schematic,

1. VDD_MPU_MON must be left unconnected (remove R59): Its already DNM (assembly instruction is missing in attached image).
2. Oscillator grounds must be connected to common GND: As per the "TMDSSK3358 Board design" Oscillator grounds are not connected to common ground.
3. I cannot see pullup resistors on I2C0 lines: 4.7K pullup resistors are already provided on I2C lines. It missed in the attached image.

As per your previous reply there is no error in schematic. So please let us know, what can be the possible reason for resetting the device ?

Thanks and Regards

Raja

OK, have you verified that the reset comes from the PMIC? Do you see the PWRONRSTn signal toggling?

Sir,

While debugging we found out the following issue.

Before modifying the Device control register (0x3f) for enabling the access to smart reflex registers by control I2C.

We are reading that register value. It is giving two different values.

when read register value = 0x60 (reset value), It is working fine.

when read register value = 0x0a, it is going to reset.

According to DEVCTRL_REG register,

register value = 0x0a means DEV_OFF_RST and DEV_SLP bits are set. According to the description when DEV_OFF_RST bit is 1, it will start an sleep to off or active to off and activate reset to the digital core ?

This may be reason for resetting the device.

Why it is giving two different values when reading the DEVCTRL_REG register ? How the register value is changed to 0x0a even though we are not modifying it (reset value = 0x60) ? What can be the reason ?

Thanks and Regards

Raja

Dear Sir,

AM335x Starter Kit Diagnostics:
processors.wiki.ti.com/.../AM335x_Starter_Kit_Diagnostics

In the above website they mentioned one limitation: "One running the second time the board resets, this will be fixed for the Beta" ?

What is the error ? Does it resemble to my case ?

Thanks and Regards

Raja