LPC408X datasheet(49/140 Pages) NXP

49 / 140 page

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RTCX2

36L2

2518

[14]

[15]

Output from the RTC 32 kHz ultra-low power oscillator

circuit.

USB_D

2

52U1

37-

[9]

I/O

USB port 2 bidirectional D

 line.

VBAT

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

RTC.

VDD(REG)(3V3)

26,

86,

174

H4,

P11,

D11

G1,

N9, E9

18,

60,

121

13, 42,

34, 67

K7, C7

3.3 V regulator supply voltage: This is the power supply for

the on-chip voltage regulator that supplies internal logic.

VDDA

Analog 3.3 V pad supply voltage: This can be connected to

the same supply as VDD(3V3) but should be isolated to

minimize noise and error. This voltage is used to power the

ADC and DAC. Tie this pin to 3.3 V if the ADC and DAC

are not used.

VDD(3V3)

15,

60,

71,

89,

112,

125,

146,

165,

181,

198

G3,

P6,

P8,

U13,

P17,

K16,

C17,

B13,

C9, D7

E2,

L4,

K8,

L11,

J14,

E12,

E10,

41,

62,

77,

102,

114,

138

28, 54,

71, 96

21, 42,

56, 77

K2,

H7,

D8,

3.3 V supply voltage: This is the power supply voltage for

I/O other than pins in the VBAT domain.

VREFP

ADC positive reference voltage: This should be the same

voltage as VDDA, but should be isolated to minimize noise

and error. The voltage level on this pin is used as a

reference for ADC and DAC. Tie this pin to 3.3 V if the

ADC and DAC are not used.

Table 3.

Pin description …continued

Not all functions are available on all parts. See Table 2 (Ethernet, USB, LCD, QEI, SD/MMC, comparator pins) and Table 5 (EMC pins).

Symbol

Description

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