UM10360 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
User manual Rev. 3 — 19 December 2013 104 of 841
NXP Semiconductors
UM10360
Chapter 7: LPC176x/5x Pin configuration
[1] Pad provides special analog functionality.
RSTOUT 14 11 O RSTOUT — This is a 3.3 V pin. A LOW output on this pin indicates that the
device is in the reset state, for any reason. This reflects the RESET input
pin and all internal reset sources.
RESET
17 14 I External reset input: A LOW on this pin resets the device, causing I/O
ports and peripherals to take on their default states, and processor
execution to begin at address 0. This is a 5 V tolerant pad with a 20 ns
glitch filter, TTL levels and hysteresis.
XTAL1 22
[1]
19
[1]
I Input to the oscillator circuit and internal clock generator circuits.
XTAL2 23
[1]
20
[1]
O Output from the oscillator amplifier.
RTCX1 16
[1]
13
[1]
I Input to the RTC oscillator circuit.
RTCX2 18
[1]
15
[1]
O Output from the RTC oscillator circuit.
V
SS
31, 41,
55, 72,
83, 97
[1]
24, 33,
43, 57,
66, 78
[1]
I ground: 0 V reference.
V
SSA
11
[1]
9
[1]
I analog ground: 0 V reference. This should be the same voltage as V
SS
,
but should be isolated to minimize noise and error.
V
DD(3V3)
28, 54,
71, 96
[1]
21, 42,
56, 77
[1]
I 3.3 V supply voltage: This is the power supply voltage for I/O other than
pins in the Vbat domain.
V
DD(REG)(3V3)
42, 84
[1]
34, 67
[1]
I 3.3 V voltage regulator supply voltage: This is the supply voltage for the
on-chip voltage regulator only.
V
DDA
10
[1]
8
[1]
I analog 3.3 V pad supply voltage: This can be connected to the same
supply as V
DD(3V3)
but should be isolated to minimize noise and error. This
voltage is used to power the ADC and DAC.
Note: this pin should be tied
to 3.3v if the ADC and DAC are not used.
V
REFP
12
[1]
10
[1]
I ADC positive reference voltage: This should be nominally the same
voltage as V
DDA
but should be isolated to minimize noise and error. The
voltage level on this pin is used as a reference for ADC and DAC.
Note:
this pin should be tied to 3.3v if the ADC and DAC are not used.
V
REFN
15
[1]
12
[1]
I ADC negative reference voltage: This should be the same voltage as
V
SS
but should be isolated to minimize noise and error. Level on this pin is
used as a reference for ADC and DAC.
V
BAT
19
[1]
16
[1]
I RTC domain power supply: 3.3 V on this pin supplies the power to the
RTC peripheral.
n.c. 13 - - not connected
Table 73. Pin description …continued
Symbol LQFP
100
LQFP
80
Type Description
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