TPS25750: Enabling USB-C PD negociation when loading patch from MCU and no battery connected

Good Morning Morgan,

Would you be able to provide the settings file (JSON) format from the TPS25750 Application Customization GUI that you are using?

Kind regards,

Conner Gillette

Hello Conner,

I work with Morgan on this project. Please find below the json from the TPS25750 App GUI from which we generate the lowRegion.bin we load through I²C.

{
   "questionnaire":{
      "version":"7.0.4.7",
      "answers":[
         4,
         null,
         3,
         null,
         1,
         1,
         1,
         null,
         1,
         null,
         0,
         12.6,
         3,
         0.12,
         0.32
      ],
      "options":{
         
      },
      "configID":"0000",
      "vendorID":"0000"
   },
   "configuration":{
      "data":{
         "selected_ace":[
            {
               "register":6,
               "data":[
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0
               ]
            },
            {
               "register":22,
               "data":[
                  10,
                  0,
                  0,
                  77,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  3
               ]
            },
            {
               "register":50,
               "data":[
                  0,
                  168,
                  42,
                  44,
                  145,
                  1,
                  38,
                  44,
                  209,
                  2,
                  0,
                  44,
                  177,
                  4,
                  0,
                  244,
                  65,
                  6,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0
               ]
            },
            {
               "register":51,
               "data":[
                  4,
                  44,
                  145,
                  1,
                  16,
                  44,
                  209,
                  2,
                  0,
                  44,
                  177,
                  4,
                  0,
                  44,
                  65,
                  6,
                  0,
                  69,
                  65,
                  6,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0
               ]
            },
            {
               "register":92,
               "data":[
                  48,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  16,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  48,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  4,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0
               ]
            },
            {
               "register":117,
               "data":[
                  0,
                  0,
                  0,
                  0
               ]
            }
         ]
      }
   }
}

Also, if this can help, here is the dump of most of the registers when we have no battery plugged on a 60W USB-C power supply :

{
        "registers": {
                "tps25750": {
                        "mode": "APP ",
                        "type": "I2C ",
                        "device_capabilities": {
                                "power_role": 0,
                                "usb_pd_capability": 0,
                                "bc1p2_supported": 3,
                                "i2cm_level": 1
                        },
                        "int_event1": {
                                "cmd_complete": 1,
                                "error_device_incompatible": 0,
                                "error_cannot_provide_voltage_or_current": 0,
                                "error_can_provide_voltage_or_current_later": 0,
                                "error_power_event_occurred": 0,
                                "error_missing_get_cap_message": 0,
                                "error_protocol_error": 0,
                                "error_message_data": 0,
                                "snk_transition_complete": 0,
                                "plug_early_notification": 0,
                                "error_unable_to_source": 0,
                                "tx_mem_buffer_empty": 0,
                                "patch_loaded": 1,
                                "ready_for_patch": 1,
                                "i2c_master_nack_ed": 0
                        },
                        "status": {
                                "plug_present": 1,
                                "conn_state": 6,
                                "plug_orientation": 0,
                                "port_role": 0,
                                "data_role": 0,
                                "vbus_status": 1,
                                "usb_host_present": 0,
                                "acting_as_legacy": 3,
                                "bist": 0
                        },
                        "power_path_status": {
                                "pp_cable1_switch": 0,
                                "pp1switch": 0,
                                "pp3switch": 1,
                                "pp1_overcurrent": 0,
                                "pp_cable1_overcurrent": 0,
                                "power_source": 2
                        },
                        "port_control": {
                                "type_c_current": 2,
                                "resistor15k_present": 0,
                                "charger_advertise_enable": 0,
                                "charger_detect_enable": 0
                        },
                        "boot_status": {
                                "patch_header_err": 0,
                                "dead_battery_flag": 1,
                                "i2c_eeprom_present": 0,
                                "patch_download_err": 0,
                                "master_tsd": 0,
                                "patch_config_source": 6,
                                "rev_id": 161
                        },
                        "device_info": "TPS65992 HW00A1 FWF509.05.00_0008 ZAceS",
                        "sink_caps": {
                                "num_pdo": 4,
                                "PD1": {
                                        "operational_current_mA": 3000,
                                        "voltage_mV": 5000,
                                        "dual_role_data": 0,
                                        "higher_capability": 1,
                                        "dual_role_power": 0,
                                        "supply_type": 0
                                },
                                "PD2": {
                                        "operational_current_mA": 3000,
                                        "voltage_mV": 9000,
                                        "dual_role_data": 0,
                                        "higher_capability": 0,
                                        "dual_role_power": 0,
                                        "supply_type": 0
                                },
                                "PD3": {
                                        "operational_current_mA": 3000,
                                        "voltage_mV": 15000,
                                        "dual_role_data": 0,
                                        "higher_capability": 0,
                                        "dual_role_power": 0,
                                        "supply_type": 0
                                },
                                "PD4": {
                                        "operational_current_mA": 3000,
                                        "voltage_mV": 20000,
                                        "dual_role_data": 0,
                                        "higher_capability": 0,
                                        "dual_role_power": 0,
                                        "supply_type": 0
                                },
                                "active": {
                                        "operational_current_mA": 0,
                                        "voltage_mV": 0,
                                        "dual_role_data": 0,
                                        "higher_capability": 0,
                                        "dual_role_power": 0,
                                        "supply_type": 0
                                }
                        },
                        "power_status": {
                                "power_connection": 1,
                                "source_sink": 1,
                                "type_c_current": 2,
                                "charger_detect_status": 0,
                                "charger_advertise_status": 2
                        },
                        "pd_status": {
                                "cc_pull_up": 3,
                                "port_type": 1,
                                "present_pd_role": 0,
                                "soft_reset_details": 0,
                                "hard_reset_details": 0,
                                "error_recovery_details": 0,
                                "data_reset_details": 0
                        }
                },
                "bq25792": {
                        "reg00_minimal_system_voltage": {
                                "vsysmin_raw": 26,
                                "vsysmin_mv": 9000
                        },
                        "reg01_charge_voltage_limit": {
                                "charge_voltage_limit_raw": 1260,
                                "charge_voltage_limit_mv": 12600
                        },
                        "reg03_charge_current_limit": {
                                "charge_current_limit_raw": 300,
                                "charge_current_limit_ma": 3000
                        },
                        "reg05_input_voltage_limit": {
                                "input_voltage_limit_raw": 46,
                                "input_voltage_limit_mv": 4600
                        },
                        "reg06_input_current_limit": {
                                "charge_input_limit_raw": 300,
                                "charge_input_limit_ma": 3000
                        },
                        "reg0f_charger_control_0": {
                                "en_term": 1,
                                "en_hiz": 0,
                                "force_ico": 0,
                                "en_ico": 0,
                                "en_chg": 1,
                                "force_ibatdis": 0,
                                "en_auto_ibatdis": 1
                        },
                        "reg10_charger_control_1": {
                                "watchdog_2": 0,
                                "wd_rst": 0,
                                "vac_ovp_1": 0
                        },
                        "reg13_charger_control_4": {
                                "en_ibus_ocp": 1,
                                "force_vindpm_det": 0,
                                "dis_votg_uvp": 0,
                                "dis_vsys_short": 0,
                                "dis_stat": 0,
                                "pwm_freq": 0,
                                "en_acdrv1": 0,
                                "en_acdrv2": 0
                        },
                        "reg16_temperature_control": {
                                "vac2_pd_en": 0,
                                "vac1_pd_en": 0,
                                "vbus_pd_en": 0,
                                "tshut_1": 0,
                                "treg_1": 3
                        },
                        "reg1b_charger_status_0": {
                                "vbus_present_stat": 1,
                                "ac1_present_stat": 1,
                                "ac2_present_stat": 1,
                                "pg_stat": 1,
                                "poorsrc_stat": 0,
                                "wd_stat": 0,
                                "vindpm_stat": 0,
                                "iindpm_stat": 0
                        },
                        "reg1c_charger_status_1": {
                                "bc1_2_done_stat": 0,
                                "vbus_stat": 5,
                                "chg_stat_2": 0
                        },
                        "reg1d_charger_status_2": {
                                "vbat_present_stat": 0,
                                "dpdm_stat": 0,
                                "treg_stat": 0,
                                "ico_stat_1_0": 0
                        },
                        "reg24_charger_flag_2": {
                                "topoff_tmr_flag": 0,
                                "prechg_tmr_flag": 0,
                                "trichg_tmr_flag": 0,
                                "chg_tmr_flag": 0,
                                "vsys_flag": 1,
                                "adc_done_flag": 0,
                                "dpdm_done_flag": 1
                        },
                        "reg2e_adc_control": {
                                "adc_avg_init": 0,
                                "adc_avg": 0,
                                "adc_sample_1": 3,
                                "adc_rate": 0,
                                "adc_en": 0
                        },
                        "reg2f_adc_function_disable0": {
                                "tdie_adc_dis": 0,
                                "ts_adc_dis": 0,
                                "vsys_adc_dis": 0,
                                "vbat_adc_dis": 0,
                                "vbus_adc_dis": 0,
                                "ibat_adc_dis": 0,
                                "ibus_adc_dis": 0
                        },
                        "reg30_adc_function_disable1": {
                                "vac1_adc_dis": 0,
                                "vac2_adc_dis": 0,
                                "dm_adc_dis": 0,
                                "dp_adc_dis": 0
                        },
                        "reg35_vbus_adc": {
                                "vbus_adc_mv": 5134
                        },
                        "reg3b_vbat_adc": {
                                "vbat_adc_mv": 0
                        },
                        "reg3d_vsys_adc": {
                                "vsys_adc_mv": 0
                        },
                        "reg47_dpdm_driver": {
                                "dminus_dac_2": 0,
                                "dplus_dac_2": 0
                        }
                }
        }
}

While using 'AlwaysEnableSink" mode, after the patch is loaded, can you attempt to send the 4CC command GSrc? This should cause the higher voltage PDO to be negotiated if the patch was successfully loaded and the source offers higher voltage PDOs. Please let me know if this resolves your issue, or if you run into further issues.

Detail on the 4CC command below:

Kind regards,

Conner Gillette

Hello Conner,

after more testing, the 'GSrC' command is always rejected (task result 0x3) while the negotiation is not done :

• Battery unplugged w/ Dead Battery Flag-> 'GSrC' result 0x3
• Plug Battery -> 'GSrC' result 0x3
• Clear Dead-Battery flag -> Negotiation done -> 'GSrC' result 0x00

When the negotiation is done, we can see that the 0x30 register is updated, but the 'GSrC' command doesn't seem to be able to update it by itself before that.

You can see below the list of the Source Capabilities once the negotiation is done :

{
"rx_source_caps": {
        "num_pdo": 6,
        "PD1": {
                "operational_current_mA": 2500,
                "voltage_mV": 5000,
                "peak_current": 0,
                "unchunked_ext_support": 0,
                "dual_role_data": 0,
                "usb_suspend_support": 0,
                "dual_role_power": 1,
                "supply_type": 0
        },
        "PD2": {
                "operational_current_mA": 2730,
                "voltage_mV": 9000,
                "peak_current": 0,
                "unchunked_ext_support": 0,
                "dual_role_data": 0,
                "usb_suspend_support": 0,
                "dual_role_power": 1,
                "supply_type": 0
        },
        "PD3": {
                "operational_current_mA": 2800,
                "voltage_mV": 12000,
                "peak_current": 0,
                "unchunked_ext_support": 0,
                "dual_role_data": 0,
                "usb_suspend_support": 0,
                "dual_role_power": 1,
                "supply_type": 0
        },
        "PD4": {
                "operational_current_mA": 2840,
                "voltage_mV": 15000,
                "peak_current": 0,
                "unchunked_ext_support": 0,
                "dual_role_data": 0,
                "usb_suspend_support": 0,
                "dual_role_power": 1,
                "supply_type": 0
        },
        "PD5": {
                "operational_current_mA": 3130,
                "voltage_mV": 20000,
                "peak_current": 0,
                "unchunked_ext_support": 0,
                "dual_role_data": 0,
                "usb_suspend_support": 0,
                "dual_role_power": 1,
                "supply_type": 0
        },
        "PD6": {
                "operational_current_mA": 3140,
                "voltage_mV": 13200,
                "peak_current": 2,
                "unchunked_ext_support": 1,
                "dual_role_data": 0,
                "usb_suspend_support": 0,
                "dual_role_power": 0,
                "supply_type": 3
        }
    }
}

Given the datasheet, do you have a way to know why the command is rejected ?

Best regards,

Richard

Just to clarify, are you trying to send GSrC after you see the 0x31 register (your sink capabilities, since you are sinking power to charge the dead battery) updated with your high voltage PDOs?

We are trying to send the GSrC after loading the lowRegion.bin through I²C. As we are a sink-only device (only recharge the battery), at that moment, we can see the 0x33 TX_SINK_CAPS register (our sinks caps we promote to the source), but nothing in the 0x30 RX_SOURCE_CAPS register.

We never read the 0x31 RX_SINK_CAPS register. Do we need to ?

Richard

Could it be possible we maybe made a mistake in our electrical hw wiring ? Please see an extract of our schematics, if you see an evident mistake we could have made.

Thank you,

Richard

Thank you Richard, I will review the schematic and the dead battery functionality and provide an update by Friday EOB.

Thank you ! Additional information we discovered today : when disconnecting/reconnecting the CC lines, it seems to trigger the PD negotiation. This test was done while having the battery plugged but the dead-battery flag still on, just so our system doesn't shutdown when disconnecting the CC lines.

Have you seen similar behavior before ?

Richard

I haven't seen this behavior before, no. So, you're able to successfully load the patch, but the device won't renegotiate to a higher PDO until you disconnect and reconnect the CC lines?

Also, after giving your schematic a cursory review, I don't see any issues. I will consult with one of our systems engineers and get back to you.

Kind regards,

Conner

Thank you for following up. I'm glad to hear it's working. Please reach out if you run into any further issues.

Kind regards,

Conner Gillette