Datasheet

LPC2470 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 4.1 — 16 October 2013 25 of 91
NXP Semiconductors
LPC2470
Flashless 16-bit/32-bit microcontroller
[1] 5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis.
[2] Either the I
2
S function or the LCD function is selectable, see Table 19, Table 20, and Table 21.
[3] 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.
[4] 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.
[5] 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.
[6] 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).
[7] Either the USB OTG function or the LCD function is selectable, see Table 19
, Table 20, and Table 21.
[8] Either the trace function or the LCD function is selectable, see Table 19
, Table 20, and Table 21.
[9] 5 V tolerant pad with 10 ns glitch filter providing digital I/O functions with TTL levels and hysteresis.
[10] Either one of the external interrupts EINT1
to EINT3 or the LCD function is selectable, see Table 19, Ta ble 20, and Table 21.
[11] Either one of the timer outputs MAT2[1] and MAT2[0] or the LCD function is selectable, see Table 19
, Table 20 , and Table 21.
[12] 5 V tolerant pad with 20 ns glitch filter providing digital I/O function with TTL levels and hysteresis.
[13] Pad provides special analog functionality.
[14] 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.
[15] If the RTC is not used, these pins can be left floating.
[16] This pin has a built-in pull-up resistor.
[17] This pin has no built-in pull-up and no built-in pull-down resistor.
VREF 24
[13]
K1
[13]
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
[13]
M3
[13]
I RTC power supply: 3.3 V on this pin supplies the power to the RTC
peripheral.
Table 4. Pin description
…continued
Symbol Pin Ball Type Description