LPC2921 datasheet(83/83 Pages) NXP

83 / 83 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: 15 June 2009

Document identifier: LPC2921_23_25_1

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 Sub System

(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) . . . . . . . . . 46

6.15.3.1

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

6.15.4

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

6.15.4.1

Functional description. . . . . . . . . . . . . . . . . . . 47

6.15.4.2

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

6.15.5

Power Management Unit (PMU) . . . . . . . . . . . 48

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

CLKOUT 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 . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Contact information . . . . . . . . . . . . . . . . . . . . 81

Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

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