Datasheet

LPC2420_60 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 6.2 — 16 October 2013 25 of 87
NXP Semiconductors
LPC2420/2460
Flashless 16-bit/32-bit microcontroller
[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-bus 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.
V
DD(DCDC)(3V3)
26, 86,
174
[7]
H4, P11,
D11
[7]
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
[7]
G4
[7]
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
[7]
K1
[7]
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
[7]
M3
[7]
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