PN7120 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.1 — 8 October 2015
312431 11 of 55
NXP Semiconductors
PN7120
Full NFC Forum-compliant controller with integrated firmware
At application level, the PN7120 will continuously switch between different states to
optimize the current consumption (polling loop mode). Refer to Table 1
for targeted
current consumption in here described states.
The PN7120 is designed to allow the host controller to have full control over its functional
states, thus of the power consumption of the PN7120 based NFC solution and possibility
to restrict parts of the PN7120 functionality.
10.1.2.1 Monitor state
In Monitor state, the PN7120 will exit it only if the battery voltage recovers over the critical
level. Battery voltage monitor thresholds show hysteresis behavior as defined in Table 26
.
PN7120 will autonomously shut-down internal PMU supply to protect the battery from
deep discharge.
10.1.2.2 Hard Power Down (HPD) state
The Hard Power Down state is entered when V
DD(PAD)
and V
BAT
are high by setting VEN
voltage < 0.4 V. As these signals are under host control, the PN7120 has no influence on
entering or exiting this state.
10.1.2.3 Standby state
Active state is PN7120’s default state after boot sequence in order to allow a quick
configuration of PN7120. It is recommended to change the default state to Standby state
after first boot in order to save power. PN7120 can switch to Standby state autonomously
(if configured by host).
In this state PN7120 most blocks including CPU are no more supplied. Number of
wake-up sources exist to put PN7120 into Active state:
• I
2
C-bus interface wake-up event
• Antenna RF level detector
Table 8. PN7120 power states
Power state name Description
Monitor The PN7120 is supplied by V
BAT
which voltage is below its programmable
critical level, VEN voltage > 1.1 V and the Monitor state is enabled. The
system power mode is Power Off mode.
Hard Power Down The PN7120 is supplied by V
BAT
which voltage is above its programmable
critical level when Monitor state is enabled and PN7120 is kept in Hard
Power Down (VEN voltage is kept low by host or SW programming) to have
the minimum power consumption. The system power mode is in Power Off.
Standby The PN7120 is supplied by V
BAT
which voltage is above its programmable
critical level when the Monitor state is enabled, VEN voltage is high (by host
or SW programming) and minimum part of PN7120 is kept supplied to enable
configured wake-up sources which allow to switch to Active state; RF field,
Host interface. The system power mode is Full power mode.
Active The PN7120 is supplied by V
BAT
which voltage is above its programmable
critical level when Monitor state is enabled, VEN voltage is high (by host or
SW programming) and the PN7120 internal blocks are supplied. 3 functional
modes are defined: Idle, Listener and Poller. The system power mode is Full
power mode.