LPC546xx
NXP Semiconductors
32-bit ARM Cortex-M4 microcontroller
Table 5.
Pin
Termination of unused pins
Default Recommended termination of unused pins
state[1]
USBn_DM
F
Can be left unconnected. If USB interface is not used, pin can be left unconnected
except in deep power-down mode where it must be externally pulled low. When the
USB PHY is disabled, the pins are floating.
USB1_AVSCC
USB1_VBUS
F
F
F
F
F
F
Tie to VSS.
Tie to VDD.
USB1_AVDDC3V3
USB1_AVDDTX3V3
USB1_AVSSTX3V3
USB1_ID
Tie to VDD.
Tie to VDD.
Tie to VSS.
Can be left unconnected. If USB interface is not used, pin can be left unconnected.
[1] I = Input, IA = Inactive (no pull-up/pull-down enabled), PU = Pull-Up enabled, F = Floating
6.2.2 Pin states in different power modes
Table 6.
Pin
Pin states in different power modes
Active
Sleep
Deep-sleep
Deep
power-down[2]
PIOn_m pins (not I2C)
PIO0_13 to PIO0_14 (open-drain As configured in the IOCON[1].
I2C-bus pins)
As configured in the IOCON[1]. Default: internal pull-up enabled.
Floating
Floating
PIO3_23 to PIO3_24 (open-drain As configured in the IOCON[1].
I2C-bus pins)
Floating
RESET
Reset function enabled. Default: input, internal pull-up enabled.
Reset function disabled.
[1] Default and programmed pin states are retained in sleep and deep-sleep.
[2] If VBAT> VDD, the external reset pin must be floating to prevent high VBAT leakage.
LPC546xx
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© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 2.5 — 20 June 2018
54 of 169
NXP [ NXP ]
