NXP Semiconductors PN7462 series User Manual page 76

NXP Semiconductors
8.3.4 Wake-up from Standby/Suspend Mode
Standby/suspend mode is left if one of the following conditions is met:
• Host activity (SPI, I2C, HSU) for standby mode and USB Resume for suspend mode
• Contact card insertion/removal detection
• Wake-up timer using a 6 bit counter and a match register with programmable
• Active Reset Source: e.g. current overconsumption on the PVDD_OUT, voltage
• Disappearance of PVDD: Voltage drop below 1.8 V triggers wake-up; Always active
• RF level detection caused by activity on the CLIF interface e.g. by bringing card near
• Temperature sensor threshold reached: when the temperature goes below the
• GPIO: transition from 0 to 1 on input GPIO pads can be used to wakeup
8.3.5 Hard Power Down Mode
This is the lowest power mode allowing for the highest reduction of the power
consumption. All clocks are turned off, all LDOs are turned off, except the MLDO which is
set to the low power mode
The PN7462 family enters the Hard Power Down mode when RST_N is set to zero or the
VBUS voltage is going below 2.3 V.
The PN7462 family exits the Hard Power Down mode, when RST_N pin is set to high
level and VBUS voltage goes above 2.3 V.
8.3.6 LDOs/PLLs in different power modes
Table 69. LDOs/PLLs in power modes
LDO/PLL Active
LDOs
MLDO full power
Full/Low
PVDDLDO power/OFF
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with following pre-conditions:
− PVDD is available
− One of interfaces is selected (hif_selection is != 0 )
− In case of SPI being selected NSS==1
standby/suspend mode duration from 50ms to 2.5s; Used to timely check for any
contact or contactless card presence
above 5V on TVDD_IN
to CLIF
configured value, the microcontroller wakes-up automatically; Each temperature
sensor can be configured individually
Standby
low power
Low power mode
All information provided in this document is subject to legal disclaimers.
Rev. 1.4 — 14 May 2018
Suspend HPD
low power low power
Power down by
Operational mode
hardware
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