Nxp Semiconductors OM11043 Fiche De Données

LPC1769_68_67_66_65_64_63

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© NXP Semiconductors N.V. 2014. All rights reserved.

[1]

5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis. This pin is pulled up to a voltage level of 2.3 V to 2.6 V.

[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 and the pin is not 5 V tolerant. This pin is pulled up to a voltage level of 2.3 V to 2.6 V.

[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. This pin is pulled up to a voltage level of 2.3 V to 2.6 V.

[4]

Open-drain 5 V tolerant digital I/O pad, compatible with I

2

C-bus 400 kHz specification. This pad 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). This pad is not 5 V tolerant.

[6]

5 V tolerant pad with 10 ns glitch filter providing digital I/O functions with TTL levels and hysteresis. This pin is pulled up to a voltage 
level of 2.3 V to 2.6 V.

[7]

5 V tolerant pad with TTL levels and hysteresis. Internal pull-up and pull-down resistors disabled.

[8]

5 V tolerant pad with TTL levels and hysteresis and internal pull-up resistor.

[9]

5 V tolerant pad with 20 ns glitch filter providing digital I/O function with TTL levels and hysteresis.

[10] Pad provides special analog functionality. A 32 kHz crystal oscillator must be used with the RTC.

[11] When the system 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] When the RTC is not used, connect VBAT to V

DD(REG)(3V3)

 and leave RTCX1 floating.

VREFN

15

F1

A6

I

ADC negative reference voltage: This should be nominally the 
same voltage as V

SS

 but should be isolated to minimize noise and 

error. Level on this pin is used as a reference for ADC and DAC.

VBAT

19

G2

A8

I

RTC pin power supply: 3.3 V on this pin supplies the power to the 
RTC peripheral.

n.c.

13

D4, 
E4

B6, 
D6

-

not connected.