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NXP Semiconductors LPC2917 Скачать руководство пользователя страница 35

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LPC2917_19_1

© NXP B.V. 2007. All rights reserved.

Preliminary data sheet

Rev. 1.01 — 15 November 2007

35 of 68

NXP Semiconductors

LPC2917/19

ARM9 microcontroller with CAN and LIN

•

CLK_SYS_MSCSS_A clocks the AHB side of the AHB-to-VPB bus bridge

•

CLK_MSCSS_VPB clocks the subsystem VPB bus

•

CLK_MSCSS_MTMR0/1 clocks the timers

•

CLK_MSCSS_PWM0..3 clocks the PWMs.

Each ADC has two clock areas; a VPB part clocked by CLK_MSCSS_ADCx_VPB (x = 1
or 2) and a control part for the analog section clocked by CLK_ADCx = 1 or 2), see

Section 7.2.2

.

All clocks are derived from the BASE_MSCSS_CLK, except for CLK_SYS_MSCSS_A
which is derived form BASE_SYS_CLK, and the CLK_ADCx clocks which are derived
from BASE_CLK_ADC. If specific PWM or ADC modules are not used their corresponding
clocks can be switched off.

8.7.5 Analog-to-digital converter

8.7.5.1

Overview

The MSCSS in the LPC2917/19 includes two 10-bit successive-approximation
analog-to-digital converters.

The key features of the ADC interface module are:

•

ADC1 and ADC2: Eight analog inputs; time-multiplexed; measurement range up to
3.3 V

•

External reference-level inputs

•

400 ksamples per second at 10-bit resolution up to 1500 ksamples per second at 2-bit
resolution

•

Programmable resolution from 2-bit to 10-bit

•

Single analog-to-digital conversion scan mode and continuous analog-to-digital
conversion scan mode

•

Optional conversion on transition on external start input, timer capture/match signal,
PWM_sync or ‘previous’ ADC

•

Converted digital values are stored in a register for each channel

•

Optional compare condition to generate a ‘less than’ or an ‘equal to or greater than’
compare-value indication for each channel

•

Power-down mode

8.7.5.2

Description

The ADC block diagram,

Figure 9

, shows the basic architecture of each ADC. The ADC

functionality is divided into two major parts; one part running on the MSCSS Subsystem
clock, the other on the ADC clock. This split into two clock domains affects the behavior
from a system-level perspective. The actual analog-to-digital conversions take place in the
ADC clock domain, but system control takes place in the system clock domain.

A mechanism is provided to modify configuration of the ADC and control the moment at
which the updated configuration is transferred to the ADC domain.

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Содержание LPC2917

Страница 1: ...s of An ARM968E S processor with real time emulation support An AMBA multi layer Advanced High performance Bus AHB for interfacing to the on chip memory controllers Two DTL buses a universal NXP inter...

Страница 2: ...ARM968E S is based on the ARMv5TE five stage pipeline architecture Typically in a three stage pipeline architecture while one instruction is being executed its successor is being decoded and a third...

Страница 3: ...FO depths Three full duplex Q SPIs with four slave select lines 16 bits wide 8 locations deep Tx FIFO and Rx FIFO Four 32 bit timers each containing four capture and compare registers linked to I Os 3...

Страница 4: ...with real time in circuit emulator Boundary scan test supported Dual power supply CPU operating voltage 1 8 V 5 I O operating voltage 2 7 V to 3 6 V inputs tolerant up to 5 5 V 144 pin LQFP package 4...

Страница 5: ...Static Memory Controller SMC Embedded SRAM Memory 32 Kb SRAM Controller 0 Embedded FLASH Memory 512 768 Kb FLASH Memory Controller FMC Embedded SRAM Memory 16 Kb SRAM Controller 1 GLOBAL ACCEPTANCE FI...

Страница 6: ...this section 6 2 2 LQFP144 pin assignment Fig 2 Pin configuration for SOT486 1 LQFP144 LPC2917FBD144 LPC2919FBD144 108 37 72 144 109 73 1 36 144PINS Table 3 LQFP144 pin assignment Symbol Pin Descript...

Страница 7: ...ART PWM TRAP2 PWM3 MAT3 P1 26 30 GPIO 1 pin 26 PWM2 MAT0 PWM TRAP3 PWM3 MAT2 VDD IO 31 3 3 V power supply for I O P1 25 32 GPIO 1 pin 25 PWM1 MAT0 PWM3 MAT1 P1 24 33 GPIO 1 pin 24 PWM0 MAT0 PWM3 MAT0...

Страница 8: ...pin 6 SPI1 SCS2 UART1 TxD EXTBUS A6 P2 6 69 GPIO 2 pin 6 TIMER1 MAT2 EXTINT2 EXTBUS D14 P1 5 70 GPIO 1 pin 5 SPI1 SCS1 PWM3 MAT5 EXTBUS A5 P1 4 71 GPIO 1 pin 4 SPI2 SCS2 PWM3 MAT4 EXTBUS A4 TRSTN 72...

Страница 9: ...HIGH level selects boundary scan and flash programming pulled up internally NC 109 VREFP 110 HIGH reference for AD Converters VREFN 111 LOW reference for AD Converters P0 8 112 GPIO 0 pin 8 ADC1 IN0...

Страница 10: ...uired because the clock rate when running at LP_OSC speed is too low for the external debugging environment 7 1 2 Reset strategy The LPC2917 19 contains a central module the Reset Generator Unit RGU i...

Страница 11: ...an have different clock sources within the CGU The system clock for the CPU and AHB Multilayer Bus infrastructure has its own base clock This means most peripherals are clocked independently from the...

Страница 12: ...M968E S m s s s s s s s s s External Static Memory Controller SMC Embedded SRAM Memory 32 Kb SRAM Controller 0 Embedded FLASH Memory 512 768 Kb FLASH Memory Controller FMC Embedded SRAM Memory 16 Kb S...

Страница 13: ...more details of how to control the individual branch clocks Table 7 Base clock and branch clock overview Base clock Branch clock name Parts of the device clocked by this branch clock Remark BASE_SAFE...

Страница 14: ...FMC interfaces to the embedded flash memory for two tasks Providing memory data transfer Memory configuration via triggering programming and erasing BASE_MSCSS_CLK CLK_MSCSS_VPB VPB side of the MSCSS...

Страница 15: ...ns are read Flash can be read synchronously or asynchronously to the system clock In synchronous operation the flash goes into standby after returning the read data Started reads cannot be stopped and...

Страница 16: ...tors of 8 kB each and up to 11 large sectors of 64 kB each The number of large sectors depends on the device type A sector must be erased before data can be written to it The flash memory also has sec...

Страница 17: ...ess space Note that the index sector cannot be erased and that access to it has to be performed via code outside the flash 8 1 6 Flash bridge wait states To eliminate the delay associated with synchro...

Страница 18: ...it states up to 32 for static RAM devices Programmable initial and subsequent burst read wait state for burst ROM devices Programmable write protection Programmable burst mode operation Programmable e...

Страница 19: ...controller pins 8 2 4 External static memory controller clock description The External Static Memory Controller is clocked by CLK_SYS_SMC see Section 7 2 2 8 2 5 External memory timing diagrams A timi...

Страница 20: ...iminary data sheet Rev 1 01 15 November 2007 20 of 68 NXP Semiconductors LPC2917 19 ARM9 microcontroller with CAN and LIN A timing diagram for writing to external memory is shown In Figure 5 The relat...

Страница 21: ...ontroller with CAN and LIN Usage of the idle turn around time IDCY is demonstrated In Figure 6 Extra wait states are added between a read and a write cycle in the same external memory device Address p...

Страница 22: ...ed on the chip 8 3 2 3 CFID pin description The CFID has no external pins 8 3 3 System Control Unit SCU 8 3 3 1 Overview The system control unit takes care of system related functions The key feature...

Страница 23: ...ort pins of the LPC2917 19 Table 13 shows the pins connected to the event router and also the corresponding bit position in the event router registers and the default polarity 8 4 Peripheral subsystem...

Страница 24: ...value and then periodically restarted When the watchdog times out it generates a reset through the RGU To generate watchdog interrupts in watchdog debug mode the interrupt has to be enabled via the i...

Страница 25: ...tputs per timer corresponding to match registers with the following capabilities Set LOW on match Set HIGH on match Toggle on match Do nothing on match Pause input pin MSCSS timers only 8 4 3 2 Descri...

Страница 26: ...e 16 byte receive and transmit FIFOs Registers conform to industry standard 550 Receiver FIFO trigger points at 1 byte 4 bytes 8 bytes and 14 bytes Built in baud rate generator 8 4 4 2 Description The...

Страница 27: ...rate and prescale based on SPI source clock BASE_SPI_CLK independent of system clock Separate transmit and receive FIFO memory buffers 16 bits wide 32 locations deep Programmable choice of interface...

Страница 28: ...ed with other functions on the port pins of the LPC2917 19 see Section 8 3 3 Table 16 shows the SPI pins x runs from 0 to 2 y runs from 0 to 3 1 Direction of SPIx SCS and SPIx SCK pins depends on mast...

Страница 29: ...al port pin There are two registers to control I O direction and output level The inputs are synchronized to achieve stable read levels To generate an open drain output set the bit in the output regis...

Страница 30: ...nly mode no acknowledge no active error flags Reception of own messages self reception request Full CAN mode for message reception 8 5 2 Global acceptance filter The global acceptance filter provides...

Страница 31: ...d sampling control subsystem 8 7 1 Overview The Modulation and Sampling Control Subsystem MSCSS in the LPC2917 19 includes four Pulse Width Modulators PWMs three10 bit successive approximation Analog...

Страница 32: ...nals Interrupt signals are generated on several events to closely interact with the CPU The ADCs can be used for any application needing accurate digitized data from analog sources To support applicat...

Страница 33: ...nected to the start 3 inputs of the ADCs This signal is captured in the ADC clock domain The PWM_sync and trans_enable_in of PWM 0 are connected to the 4th match output of MSCSS timer 0 to start the P...

Страница 34: ...d in Section 8 7 7 3 8 7 4 MSCSS clock description The MSCSS is clocked from a number of different sources 1 Timers c0 to c3 capture in 0 to capture in 3 m0 to m3 match out 0 to match out 3 2 ADCs st0...

Страница 35: ...ers The key features of the ADC interface module are ADC1 and ADC2 Eight analog inputs time multiplexed measurement range up to 3 3 V External reference level inputs 400 ksamples per second at 10 bit...

Страница 36: ...has four start inputs Note that start 0 and start 2 are captured in the system clock domain while start 1 and start 3 are captured in the ADC domain The start inputs are connected at MSCSS level see S...

Страница 37: ...output signals Double edge features rising and falling edges programmed individually Optional interrupt generation on match each edge Different operation modes continuous or run once 16 bit PWM counte...

Страница 38: ...l PWM consists of two counters a 16 bit prescale counter and a 16 bit PWM counter The position of the rising and falling edges of the PWM outputs can be programmed individually The prescale counter al...

Страница 39: ...WM modules are clocked by CLK_MSCSS_PWMx x 0 3 see Section 7 2 2 Note that each PWM has its own CLK_MSCSS_PWMx branch clock for power management The frequency of all these clocks is identical to CLK_M...

Страница 40: ...MTMRx x 0 1 see Section 7 2 2 Note that each timer has its own CLK_MSCSS_MTMRx branch clock for power management The frequency of all these clocks is identical to CLK_MSCSS_VPB since they are derived...

Страница 41: ...see Section 7 2 2 CLK_SYS_PCRSS is derived from BASE_SYS_CLK which can be switched off in low power modes CLK_PCR_SLOW is derived from BASE_PCR_CLK and is always on in order to be able to wake up fro...

Страница 42: ...ister write protection mechanism to prevent unintentional alteration of clocks Remark Any clock frequency adjustment has a direct impact on the timing of on board peripherals such as the UARTs SPI wat...

Страница 43: ...cks a minimum of other logic in the device like the watchdog timer To prevent the device from losing its clock source LP_OSC cannot be put into power down The crystal oscillator can be used as source...

Страница 44: ...be configured to get the required clock Multiple output generators can be connected to the same primary or secondary clock source and multiple secondary clock sources can be connected to the same PLL...

Страница 45: ...ainst a currently selected clock going from active to inactive state Therefore an inactive clock may still be sent to the system under special circumstances although an interrupt can still be generate...

Страница 46: ...ided by 2 4 8 or 16 depending on the value on the PSEL 1 0 input giving an output clock with a 50 duty cycle If a higher output frequency is needed the CCO clock can be sent directly to the output by...

Страница 47: ...auses the output to go active Table 25 Reset output configuration Reset Output Reset Source parts of the device reset when activated POR_RST power on reset module LP_OSC is source for RGU_RST RGU_RST...

Страница 48: ...f enabled clocks when a wake up event is received Status register is available to indicate if an input base clock can be safely switched off i e all branch clocks are disabled 8 8 6 2 Description The...

Страница 49: ...BASE_SYS_CLK 1 CLK_SYS BASE_SYS_CLK 1 CLK_SYS_PCR BASE_SYS_CLK 1 CLK_SYS_FMC BASE_SYS_CLK CLK_SYS_RAM0 BASE_SYS_CLK CLK_SYS_RAM1 BASE_SYS_CLK CLK_SYS_SMC BASE_SYS_CLK CLK_SYS_GESS BASE_SYS_CLK CLK_SYS...

Страница 50: ...ble routing of interrupt requests towards the ARM processor inputs IRQ and FIQ Fast identification of interrupt requests through vector Support for nesting of interrupt service routines 8 9 2 Descript...

Страница 51: ...routines Software emulation of an interrupt requesting device including interrupts 8 9 3 VIC pin description The VIC module in the LPC2917 19 has no external pins 8 9 4 VIC clock description The VIC...

Страница 52: ...charging a 100 pF capacitor via a 10 k series resistor 8 Machine model discharging a 200 pF capacitor via a 0 75 H series inductance and 10 resistor 9 112 mA per VDD IO or VSS IO should not be exceede...

Страница 53: ...max clock speeds 1 1 2 5 mA MHz All clocks off 2 30 450 A I O supply VDD IO I O digital supply voltage 2 7 3 6 V Oscillator supply VDD OSC_PLL Oscillator and PLL supply voltage 1 71 1 80 1 89 V IDDD...

Страница 54: ...age 0 VDD IO V VOH HIGH state output voltage IOH 4 mA VDD IO 0 4 V VOL LOW state output voltage IOL 4 mA 0 4 V CL Load capacitance 25 pF Analog to digital converter supply VVREFN Voltage on pin VREFN...

Страница 55: ...e filter VDD CORE must be above Vtrip high for 2 s before reset is de asserted VDD CORE must be below Vtrip low for 11 s before internal reset is asserted 7 Not 5 V tolerant when pull up is on 8 For I...

Страница 56: ...3 500 s PLL fi PLL PLL input frequency 10 25 MHz fo PLL PLL output frequency 10 160 MHz CCO direct mode 156 320 MHz Analog to digital converter fi ADC ADC input frequency 4 4 4 5 MHz fs max Maximum s...

Страница 57: ...s parameter is not part of production testing or final testing hence only a typical value is stated 3 Oscillator start up time depends on the quality of the crystal For most crystals it takes about 10...

Страница 58: ...L Lp Z y w v REFERENCES OUTLINE VERSION EUROPEAN PROJECTION ISSUE DATE IEC JEDEC JEITA mm 0 15 0 05 1 45 1 35 0 25 0 27 0 17 0 20 0 09 20 1 19 9 0 5 22 15 21 85 1 4 1 1 7 0 o o 0 08 0 2 0 08 1 DIMENSI...

Страница 59: ...g may be necessary immediately after soldering to keep the temperature within the permissible limit 14 2 2 Manual soldering Apply the soldering iron 24 V or less to the lead s of the package either be...

Страница 60: ...N10365 Surface mount reflow soldering description 14 3 2 Wave soldering Conventional single wave soldering is not recommended for surface mount devices SMDs or printed circuit boards with a high compo...

Страница 61: ...le to the transport direction of the printed circuit board The footprint must incorporate solder thieves downstream and at the side corners During placement and before soldering the package must be fi...

Страница 62: ...ersions with the heatsink on the bottom side the solder cannot penetrate between the printed circuit board and the heatsink On versions with the heatsink on the top side the solder might be deposited...

Страница 63: ...ontroller with CAN and LIN 15 Abbreviations Table 35 Abbreviations list Abbreviation Description AHB Advanced High performance Bus BCL Buffer Control List BDL Buffer Descriptor List CISC Complex Instr...

Страница 64: ...erved Preliminary data sheet Rev 1 01 15 November 2007 64 of 68 NXP Semiconductors LPC2917 19 ARM9 microcontroller with CAN and LIN 16 References 1 UM LPC2917 19 user manual 2 ARM ARM web site 3 ARM S...

Страница 65: ...l rights reserved Preliminary data sheet Rev 1 01 15 November 2007 65 of 68 NXP Semiconductors LPC2917 19 ARM9 microcontroller with CAN and LIN 17 Revision history Table 36 Revision history Document I...

Страница 66: ...to be suitable for use in medical military aircraft space or life support equipment nor in applications where failure or malfunction of a NXP Semiconductors product can reasonably be expected to resu...

Страница 67: ...tatic memory controller 18 8 2 1 Overview 18 8 2 2 Description 18 8 2 3 External static memory controller pin description 19 8 2 4 External static memory controller clock description 19 8 2 5 External...

Страница 68: ...SS 40 8 7 7 1 Overview 40 8 7 7 2 Description 40 8 7 7 3 MSCSS timer pin description 40 8 7 7 4 MSCSS timer clock description 40 8 8 Power clock and reset control subsystem 40 8 8 1 Overview 40 8 8 2...

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