PROCESSOR-SDK-AM64X: How to config VMON in AM64X EVM

li zhang

Prodigy 130 points

Part Number: PROCESSOR-SDK-AM64X

I want to use VMON_VSYS to detect voltage when power failed, how to config in program.

hardware: AM64X EVM

over 4 years ago

0 Jianzhong Xu over 4 years ago

TI__Guru 59285 points

Hi,

Are you using the Linux SDK or MCU+ SDK?

Thanks and regards,

Jianzhong

0 li zhang over 4 years ago in reply to Jianzhong Xu

Prodigy 130 points

use MCU+SDK with nortos

0 Arnon Friedmann over 4 years ago in reply to li zhang

TI__Intellectual 2465 points

we will check, thx

0 Sahin Okur over 4 years ago in reply to li zhang

TI__Mastermind 27355 points

Hello,

I'm sorry for the delay here. We will have a response for you within the next couple of days.

Regards,
Sahin

0 Ahmad_Rashed over 4 years ago in reply to li zhang

TI__Genius 13567 points

Hello Li Zhang,

The VMON_VSYS pin is different from the other VMON_xyz pins. It implements a simple comparator with 0.45V +/-3% reference. In the AM64x EVM there is a resistor divider connected to VCC_5V0 (100k R1, 11k R2) resulting in UV trip at 4.54V

POK status is captured in the below two registers to poll for UV/OV event

CTRLMMR_MCU_PRG_PP_0_STAT: 0x04518204
CTRLMMR_MCU_PRG_PP_1_STAT: 0x0451820C

There are also control registers but default settings appears to be all POK enabled for UV detection.

CTRLMMR_MCU_PRG_PP_0_STAT: 0x04518200
CTRLMMR_MCU_PRG_PP_1_STAT: 0x04518208

+1 Frank Walzer over 4 years ago in reply to Ahmad_Rashed

TI__Mastermind 44306 points

Looking at TRM I assume there is a copy and paste error in register names:

CTRLMMR_MCU_PRG_PP_0_STAT: 0x04518204
CTRLMMR_MCU_PRG_PP_1_STAT: 0x0451820C

CTRLMMR_MCU_PRG_PP_0_CTRL: 0x04518200
CTRLMMR_MCU_PRG_PP_1_CTRL: 0x04518208

Just corrected the last two. Does it solve your issue?

0 Ahmad_Rashed over 4 years ago

TI__Genius 13567 points

Hello Li Zhang,

Here is some additional information regarding the ESM interrupt mapping in AM64x / AM243x. You may poll the register in CTRLMMR_MCU_PRG_PP_0_STAT or use the ESM interrupt #81 based on the below mapping.

ESM errors 64 through 77 mapping:
[6] pok_vdds_ddrio
[5] pok_vddr_core
[4] pok_vddshv_mcu_1p8
[3] pok_vddshv_mcu_3p3
[2] pok_vmon_cap_mcu_general
[1] pok_vddshv_main_1p8
[0] pok_vddshv_main_3p3

ESM errors 78 through 82 mapping:
[4] pok_vdd_mcu_ov
[3] pok_vdda_pmic_in_uv
[2] pok_vdda_mcu_uv
[1] pok_vdda_mcu_ov
[0] pok_vdd_mcu_uv

0 li zhang over 4 years ago in reply to Ahmad_Rashed

Prodigy 130 points

I have found the value that I want to monitor. It's bit2 in CTRLMMR_MCU_PRG_PP_0_STAT Register. but I don't understand the description of bit2, is there some error in the descriptions?

+1 Ahmad_Rashed over 4 years ago in reply to li zhang

TI__Genius 13567 points

Hello Li,

Yes it appears to be an error in the register descriptions. The field name is correct but the field description is not.

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PROCESSOR-SDK-AM64X: How to config VMON in AM64X EVM