Datasheet

LPC2468 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 6.2 — 11 January 2013 23 of 85
NXP Semiconductors
LPC2468
Single-chip 16-bit/32-bit micro
[1] 5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis.
[2] 5 V tolerant pad providing digital I/O functions (with TTL levels and hysteresis) and analog input. When configured as a ADC input,
digital section of the pad is disabled.
[3] 5 V tolerant pad providing digital I/O with TTL levels and hysteresis and analog output function. When configured as the DAC output,
digital section of the pad is disabled.
[4] Open-drain 5 V tolerant digital I/O pad, compatible with I
2
C-bus 400 kHz specification. It requires an external pull-up to provide output
functionality. When power is switched off, this pin connected to the I
2
C-bus is floating and does not disturb the I
2
C lines. Open-drain
configuration applies to all functions on this pin.
[5] Pad provides digital I/O and USB functions. It is designed in accordance with the USB specification, revision 2.0 (Full-speed and
Low-speed mode only).
[6] 5 V tolerant pad with 10 ns glitch filter providing digital I/O functions with TTL levels and hysteresis.
[7] Pad provides special analog functionality.
[8] This pin has a built-in pull-up resistor.
[9] This pin has no built-in pull-up and no built-in pull-down resistor.
[10] 5 V tolerant pad with 20 ns glitch filter providing digital I/O function with TTL levels and hysteresis.
[11] When the main oscillator is not used, connect XTAL1 and XTAL2 as follows: XTAL1 can be left floating or can be grounded (grounding
is preferred to reduce susceptibility to noise). XTAL2 should be left floating.
[12] If the RTC is not used, these pins can be left floating.
[13] Pad provides special analog functionality.
[14] Pad provides special analog functionality.
[15] Pad provides special analog functionality.
[16] Pad provides special analog functionality.
[17] Pad provides special analog functionality.
[18] Pad provides special analog functionality.
V
DD(3V3)
15, 60,
71, 89,
112,
125,
146,
165,
181,
198
[15]
G3, P6,
P8, U13,
P17,
K16,
C17,
B13, C9,
D7
[15]
I 3.3 V supply voltage: This is the power supply voltage for the I/O ports.
n.c. 30, 117,
141
[16]
J4, L14,
G14
[16]
I not connected pins: These pins must be left unconnected (floating).
V
DD(DCDC)(3V3)
26, 86,
174
[17]
H4, P11,
D11
[17]
I 3.3 V DC-to-DC converter supply voltage: This is the power supply for
the on-chip DC-to-DC converter.
V
DDA
20
[18]
G4
[18]
I analog 3.3 V pad supply voltage: This should be nominally the same
voltage as V
DD(3V3)
but should be isolated to minimize noise and error.
This voltage is used to power the ADC and DAC.
VREF 24
[18]
K1
[18]
I ADC reference: This should be nominally the same voltage as V
DD(3V3)
but should be isolated to minimize noise and error. The level on this pin is
used as a reference for ADC and DAC.
VBAT 38
[18]
M3
[18]
I RTC power supply: 3.3 V on this pin supplies the power to the RTC.
Table 4. Pin description …continued
Symbol Pin Ball Type Description