Table 3-3. Digital Connections by System Feature (continued)
Device
GPIO Mapping System Features
(1)
PMIC Pin
NVM
Function
PDN Signals
Active
SoC
Functiona
l Safety
MCU -
only
MCU-
Safety
Island
GPIO
Retention
DDR
Retention
SD Card
LP876411
B5-Q1
nINT nINT H_MCU_INTn R
nRSTOUT nRSTOUT Unused
SCL_I2C1 SCL_I2C1 H_WKUP_I2C0 R
SDATA_I2
C1
SDATA_I2
C1
H_WKUP_I2C0 R
GPIO_1 GPIO_1 Unused
GPIO_2 GPIO_2 Unused
GPIO_3 GPIO_3 Unused
GPIO_4 GPIO_4 Unused
GPIO_5 GPIO_5 Unused
GPIO_6 GPIO_6 Unused
GPIO_7 GPIO_7 Unused
GPIO_8 SCLK_SP
MI
PMICC_SCLK R
GPIO_9 SDATA_S
PMI
PMICC_SDATA R
GPIO_10 GPIO_10 Unused
(1) R is Required. O is optional.
(2) LP_WKUP1 function is masked in the static settings. Instructions for unmasking the function are provided in Section 7.1.3, Section 7.2
and Section 7.3.
(3) If it is desired to disable the watchdog through hardware, GPIO_8 is required and must be set high by the time nRSTOUT goes high.
After nRSTOUT is high, the watchdog state is latched and the pin can be configured for other functions through software.
(4) This GPIO is not required for power sequencing or PMIC functionality and can be configured by software for a different purpose if
desired.
(5) GPIO4 of the TPS65941111 is not part of the power sequences, Section 6.3. This GPIO must be configured by the SOC at runtime.
4 Supporting Functional Safety Systems
By using the PDN-0A power solution, the system can leverage the following PMIC functional safety features:
• Independent Power Control of MCU and Main Rails
• Independent Monitoring and Reset for MCU and Main Rails
• Input Supply Monitoring
• Output Voltage and Current Monitoring
• Question and Answer Watchdog
• Fault Reporting Interrupts
• Enable Drive Pin that provides an independent path to disable system actuators
• Error Pin Monitoring
• Internal Diagnostics including voltage monitoring, temperature monitoring, and Built-In Self-Test
Refer to the Safety Manual of the TPS6594-Q1 and LP8764-Q1 devices for full descriptions and analysis of the
PMIC functional safety features. These functional safety features can assist in achieving up to ASIL-D rating
for a system. Additionally, these features help in achieving the functional safety assumptions utilized by the
processor to achieve up to ASIL-D rating. See the Safety Manual for Jacinto
™
7 Processors for a complete list of
functional safety system assumptions.
www.ti.com Supporting Functional Safety Systems
SLVUCJ9 – FEBRUARY 2023
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TPS65941120-Q1, TPS65941421-Q1 and LP876411B5-Q1 PMIC User Guide
for J721S2, PDN-0A
11
Copyright © 2023 Texas Instruments Incorporated
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