Datasheet

LPC2377_78 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 6.1 — 16 October 2013 15 of 69
NXP Semiconductors
LPC2377/78
Single-chip 16-bit/32-bit microcontrollers
[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 DAC 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 (LPC2378 only). 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] 5 V tolerant pad with 20 ns glitch filter providing digital I/O function with TTL levels and hysteresis.
[8] Pad provides special analog functionality.
[9] This pin has a built-in pull-up resistor.
[10] This pin has no built-in pull-up and no built-in pull-down resistor.
[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)
41, 62,
77, 102,
114,
138
[15]
I 3.3 V supply voltage: These pins provide power supply voltage for the I/O ports.
n.c. 21, 81,
98
[16]
I Leave these pins unconnected.
V
DD(DCDC)(3V3)
18, 60,
121
[17]
I 3.3 V DC-to-DC converter supply voltage: These pins provide the power supply
voltage for the on-chip DC-to-DC converter only.
V
DDA
14
[18]
I analog 3.3 V pad supply voltage: This pin 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 17
[18]
I ADC reference: This pin 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 27
[18]
I RTC pin power supply: 3.3 V on this pin supplies the power to the RTC peripheral.
Table 3. Pin description
…continued
Symbol Pin Type Description