LPC2470_1109 Datasheet, PDF (25/91 Pages) NXP Semiconductors – Flashless 16-bit/32-bit microcontroller; Ethernet, CAN, LCD, USB 2.0 device/host/OTG, external memory interface

NXP Semiconductors
LPC2470
Flashless 16-bit/32-bit microcontroller
Table 4.
Symbol
VREF
VBAT
Pin description …continued
Pin
Ball
24^[13]
K1^[13]
38^[13]
M3^[13]
Type
I
I
Description
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.
RTC power supply: 3.3 V on this pin supplies the power to the RTC
peripheral.
[1] 5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis.
[2] Either the I²S 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 I²C-bus 400 kHz specification. It requires an external pull-up to provide output
functionality. When power is switched off, this pin connected to the I²C-bus is floating and does not disturb the I²C 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 5 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, Table 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.
LPC2470
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 8 September 2011
© NXP B.V. 2011. All rights reserved.
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