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6.4 Interrupts
Interrupt signals are generated in the analog part of the PMU as a result of:
• TXLDO 5 V monitoring
• VCC current limiter
• DC-to-DC converter current overload
• SCVDD current overload
• TXLDO current overload
• Temperature sensor
All interrupts are "ORed" in the digital part of the PMU to output one unique PMU
interrupt line. The software has to analyze the content of the
PMU_INTERRUPT_STATUS_REG register to know which of the seven conditions
caused the interrupt. All interrupts can be enabled or disabled (masked) separately using
the PMU_INTERRUPT_ENABLE_REG register. Clearing the status bit field of one
interrupt is performed by setting the corresponding bit field in the
PMU_INTERRUPT_CLR_STATUS_REG register high. All bit fields of all
PMU_INTERRUPT_CLR_STATUS_REG and PMU_INTERRUPT_SET_STATUS_REG
registers are automatically cleared if set high after two system clock cycles.
6.5 Temperature sensors
The Power Management Unit of PN7462 family comprises two temperature sensors
associated with the contactless TXLDO and the contact DC-to-DC converter interfaces.
The main purpose of these sensors is to monitor the temperature and prevent the
overheating, which could potentially cause the damage of the chip and the customer
device. The triggering levels are configurable. Following temperatures can be chosen:
135°C, 130°C, 125°C or 120°C. By default, the temperature sensor is set to 120°C.
When one of the sensors detects a temperature issue, an interrupt is generated and the
microcontroller will be put by software into the standby mode or the suspend mode if the
USB interface is used. The registers indicate which of the two temperature sensors
(contact interface, or contactless interface) generated the interrupt. When the
temperature goes below the configured threshold temperature, the microcontroller wakes
up automatically. For a detailed description of the corresponding registers refer to
PCR_TEMP_REG.
6.6 Voltage monitoring
The voltage monitoring is used to check if the voltages are within the appropriate
specified for
VBUS (2 voltage monitors) and VBUSP (1 voltage monitor).
voltage monitors with the selectable thresholds values.
Table 35. Voltage monitor - possible threshold configuration
Voltage Monitor
VBUS1
UM10858
User manual
COMPANY PUBLIC
a proper operation of the IC. The following power supplies are monitored:
Threshold 1
2.3 V
All information provided in this document is subject to legal disclaimers.
Rev. 1.4 — 14 May 2018
314514
PN7462 family HW user manual
Table 35
Threshold 2
Threshold 3
2.7 V
N/A
UM10858
range
summarizes the
© NXP B.V. 2018. All rights reserved.
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