LPC2921 datasheet(84/84 Pages) NXP

84 / 84 page

NXP Semiconductors

LPC2921/2923/2925

ARM9 microcontroller with CAN, LIN, and USB

For more information, please visit: http://www.nxp.com

For sales office addresses, please send an email to: salesaddresses@nxp.com

Date of release: 14 April 2010

Document identifier: LPC2921_23_25_3

Please be aware that important notices concerning this document and the product(s)

described herein, have been included in section ‘Legal information’.

6.15

Power, Clock, and Reset control SubSystem

(PCRSS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

6.15.1

Clock description . . . . . . . . . . . . . . . . . . . . . . 41

6.15.2

Clock Generation Unit (CGU0) . . . . . . . . . . . . 42

6.15.2.1

Functional description. . . . . . . . . . . . . . . . . . . 42

6.15.2.2

PLL functional description . . . . . . . . . . . . . . . 45

6.15.2.3

Pin description . . . . . . . . . . . . . . . . . . . . . . . . 46

6.15.3

Clock generation for USB (CGU1) . . . . . . . . . 47

6.15.3.1

Pin description . . . . . . . . . . . . . . . . . . . . . . . . 47

6.15.4

Reset Generation Unit (RGU). . . . . . . . . . . . . 47

6.15.4.1

Functional description. . . . . . . . . . . . . . . . . . . 48

6.15.4.2

Pin description . . . . . . . . . . . . . . . . . . . . . . . . 48

6.15.5

Power Management Unit (PMU). . . . . . . . . . . 49

6.15.5.1

Functional description. . . . . . . . . . . . . . . . . . . 49

6.16

Vectored interrupt controller . . . . . . . . . . . . . . 51

6.16.1

Functional description. . . . . . . . . . . . . . . . . . . 51

6.16.2

Clock description . . . . . . . . . . . . . . . . . . . . . . 52

Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 53

Static characteristics . . . . . . . . . . . . . . . . . . . . 55

8.1

Power consumption . . . . . . . . . . . . . . . . . . . . 60

8.2

Electrical pin characteristics . . . . . . . . . . . . . . 61

Dynamic characteristics . . . . . . . . . . . . . . . . . 64

9.1

Dynamic characteristics: I/O and CLK_OUT

pins, internal clock, oscillators, PLL, and

CAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

9.2

USB interface . . . . . . . . . . . . . . . . . . . . . . . . . 66

9.3

Dynamic characteristics: I2C-bus interface. . . 67

9.4

Dynamic characteristics: SPI . . . . . . . . . . . . . 68

9.5

Dynamic characteristics: flash memory and

EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

9.6

Dynamic characteristics: ADC1/2 . . . . . . . . . 70

Application information. . . . . . . . . . . . . . . . . . 70

10.1

Operating frequency selection . . . . . . . . . . . . 70

10.2

Suggested USB interface solutions . . . . . . . . 71

10.3

SPI signal forms . . . . . . . . . . . . . . . . . . . . . . . 72

10.4

XIN_OSC input . . . . . . . . . . . . . . . . . . . . . . . . 74

10.5

XIN_OSC Printed Circuit Board (PCB)

layout guidelines . . . . . . . . . . . . . . . . . . . . . . . 74

Package outline . . . . . . . . . . . . . . . . . . . . . . . . 75

Soldering of SMD packages . . . . . . . . . . . . . . 76

12.1

Introduction to soldering . . . . . . . . . . . . . . . . . 76

12.2

Wave and reflow soldering . . . . . . . . . . . . . . . 76

12.3

Wave soldering . . . . . . . . . . . . . . . . . . . . . . . . 76

12.4

Reflow soldering . . . . . . . . . . . . . . . . . . . . . . . 77

Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 79

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Revision history . . . . . . . . . . . . . . . . . . . . . . . . 80

Legal information. . . . . . . . . . . . . . . . . . . . . . . 81

16.1

Data sheet status . . . . . . . . . . . . . . . . . . . . . . 81

16.2

Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

16.3

Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 81

16.4

Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Contact information . . . . . . . . . . . . . . . . . . . . 82

Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

LPC2921 Datasheet(PDF) 84 Page - NXP Semiconductors

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