LPC1758FBD80 NXP Semiconductors, LPC1758FBD80 Datasheet - Page 26

• Manufacturer Part Number: LPC1758FBD80
• Description: IC, 32BIT MCU, ARM CORTEX, 100MHZ LQFP80
• Manufacturer: NXP Semiconductors

Specifications of LPC1758FBD80

• Controller Family/series: (ARM Cortex)
• No. Of I/o's: 52
• Ram Memory Size: 64KB
• Cpu Speed: 100MHz
• No. Of Timers: 4
• Interface: CAN, I2C, SPI, UART
• Core Size: 32 Bit
• Program Memory Size: 512KB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
LPC1758_56_54_52_51_3
Product data sheet
7.24.1 Features
7.23 Motor control PWM
7.24 Quadrature Encoder Interface (QEI)
The motor control PWM is a specialized PWM supporting 3-phase motors and other
combinations. Feedback inputs are provided to automatically sense rotor position and use
that information to ramp speed up or down. At the same time, the motor control PWM is
highly configurable for other generalized timing, counting, capture, and compare
applications.
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.
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Double edge controlled PWM outputs can be programmed to be either positive going
or negative going pulses.
Match register updates are synchronized with pulse outputs to prevent generation of
erroneous pulses. Software must ‘release’ new match values before they can become
effective.
May be used as a standard 32-bit timer/counter with a programmable 32-bit prescaler
if the PWM mode is not enabled.
Tracks encoder position.
Increments/decrements depending on direction.
Programmable for 2x or 4x 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.
Rev. 03 — 19 November 2009
LPC1758/56/54/52/51
32-bit ARM Cortex-M3 microcontroller
© NXP B.V. 2009. All rights reserved.
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