LPC1787FBD208,551 NXP Semiconductors, LPC1787FBD208,551 Datasheet - Page 58
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LPC1787FBD208,551
Manufacturer Part Number
LPC1787FBD208,551
Description
IC MCU 32BIT 512KB FLASH 208LQFP
Manufacturer
NXP Semiconductors
Series
LPC17xxr
Datasheet
1.LPC1774FBD208551.pdf
(117 pages)
Specifications of LPC1787FBD208,551
Core Processor
ARM® Cortex-M3™
Core Size
32-Bit
Speed
120MHz
Connectivity
CAN, EBI/EMI, I²C, Microwire, MMC, SPI, SSI, SSP, UART/USART, USB OTG
Peripherals
Brown-out Detect/Reset, DMA, I²S, LCD, Motor Control PWM, POR, PWM, WDT
Number Of I /o
165
Program Memory Size
512KB (512K x 8)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
96K x 8
Voltage - Supply (vcc/vdd)
2.4 V ~ 3.6 V
Data Converters
A/D 8x12b, D/A 1x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
208-LQFP
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
568-7575
LPC1787FBD208,551
LPC1787FBD208,551
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LPC1787FBD208,551
Manufacturer:
NXP Semiconductors
Quantity:
10 000
NXP Semiconductors
LPC178X_7X
Objective data sheet
7.28.1 Features
7.28 Quadrature Encoder Interface (QEI)
7.29 ARM Cortex-M3 system tick timer
PWM to immediately release all motor drive outputs. At the same time, the motor control
PWM is highly configurable for other generalized timing, counting, capture, and compare
applications.
The maximum PWM speed is determined by the PWM resolution (n) and the operating
frequency f: PWM speed = f/2
Table 8.
Remark: The QEI is available on parts LPC1788/87/86 and LPC1778/77/76
A quadrature encoder, also known as a 2-channel incremental encoder, converts angular
displacement into two pulse signals. By monitoring both the number of pulses and the
relative phase of the two signals, the user can track the position, direction of rotation, and
velocity. In addition, a third channel, or index signal, can be used to reset the position
counter. The quadrature encoder interface decodes the digital pulses from a quadrature
encoder wheel to integrate position over time and determine direction of rotation. In
addition, the QEI can capture the velocity of the encoder wheel.
The ARM Cortex-M3 includes a system tick timer (SYSTICK) that is intended to generate
a dedicated SYSTICK exception at a 10 ms interval. In the LPC178x/7x, this timer can be
clocked from the internal AHB clock or from a device pin.
PWM resolution
6 bit
8 bit
10 bit
•
•
•
•
•
•
•
•
•
•
•
•
•
Tracks encoder position.
Increments/decrements depending on direction.
Programmable for 2 or 4 position counting.
Velocity capture using built-in timer.
Velocity compare function with “less than” interrupt.
Uses 32-bit registers for position and velocity.
Three position compare registers with interrupts.
Index counter for revolution counting.
Index compare register with interrupts.
Can combine index and position interrupts to produce an interrupt for whole and
partial revolution displacement.
Digital filter with programmable delays for encoder input signals.
Can accept decoded signal inputs (clk and direction).
Connected to APB.
PWM speed at operating frequency 120 MHz
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 27 May 2011
n
(see
Table
8).
PWM speed
1.875 MHz
0.468 MHz
0.117 MHz
32-bit ARM Cortex-M3 microcontroller
LPC178x/7x
© NXP B.V. 2011. All rights reserved.
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