LPC2921 datasheet(5/84 Pages) NXP

5 / 84 page

LPC2921_23_25_3

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Product data sheet

Rev. 03 — 14 April 2010

5 of 84

NXP Semiconductors

LPC2921/2923/2925

ARM9 microcontroller with CAN, LIN, and USB

Pinning information

5.1 Pinning

5.2 Pin description

5.2.1 General description

The LPC2921/2923/2925 uses three ports: port 1 with 32 pins, port 1 with 28 pins, and

port 5 with 2 pins. Ports 4/3/2 are not used. The pin to which each function is assigned is

controlled by the SFSP registers in the SCU. The functions combined on each port pin are

shown in the pin description tables in this section.

5.2.2 LQFP100 pin assignment

Fig 2.

Pin configuration for SOT407-1 (LQFP100)

LPC2921FBD100

LPC2923FBD100

LPC2925FBD100

002aae242

Table 3.

LQFP100 pin assignment

Pin name

Description

Function 0 (default)

Function 1

Function 2

Function 3

TDO

1[1]

IEEE 1149.1 test data out

P0[24]/TXD1/

TXDC1/SCS2[0]

2[1]

GPIO0, pin 24

UART1 TXD

CAN1 TXD

SPI2 SCS0

P0[25]/RXD1/

RXDC1/SDO2

3[1]

GPIO0, pin 25

UART1 RXD

CAN1 RXD

SPI2 SDO

P0[26]/TXD1/SDI2

4[1]

GPIO0, pin 26

UART1 TXD

SPI2 SDI

P0[27]/RXD1/SCK2

5[1]

GPIO0, pin 27

UART1 RXD

SPI2 SCK

P0[28]/CAP0[0]/

MAT0[0]

6[1]

GPIO0, pin 28

TIMER0 CAP0

TIMER0 MAT0

P0[29]/CAP0[1]/

MAT0[1]

7[1]

GPIO0, pin 29

TIMER0 CAP1

TIMER0 MAT1

VDD(IO)

3.3 V power supply for I/O

P0[30]/CAP0[2]/

MAT0[2]

9[1]

GPIO0, pin 30

TIMER0 CAP2

TIMER0 MAT2

P0[31]/CAP0[3]/

MAT0[3]

10[1]

GPIO0, pin 31

TIMER0 CAP3

TIMER0 MAT3

VSS(IO)

ground for I/O

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