DM164130-3 Microchip Technology, DM164130-3 Datasheet - Page 10

• Manufacturer Part Number: DM164130-3
• Description: BOARD DEMO FOR PIC16F/PIC18F
• Manufacturer: Microchip Technology

Specifications of DM164130-3

• Main Purpose: Interface, LIN + MCU
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: PIC16F, PIC18F
• Primary Attributes: Automotive Grade Transceiver
• Secondary Attributes: LED Status Indicators
• Processor To Be Evaluated: PIC16F, PIC18F
• Processor Series: PICxxFIxxx
• Tool Type: Demonstration Board
• Core Architecture: PIC
• Cpu Core: PIC
• Data Bus Width: 8 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

in a practical exterlor lighting application such as daytime
running lights, LED based daytime running lights improve
road safety and reduce fuel consumption by approximately
0.2 liter/100 km when compared to using the head lamp
operating in low beam mode. Plus LED daytime running
lamps offer the vehicles a touch of individual styling.
Effi cient LED Control
LEDs must be driven with a source of constant current.
Most LEDs have a specifi ed current level that will achieve
the maximum brightness for that LED without premature
failures. An LED could be driven with a linear voltage
regulator confi gured as a constant current source.
However, this approach is not practical for higher power
LEDs due to power dissipation in the regulator circuit. A
switch-mode power supply (SMPS) provides a much more
effi cient solution to drive the LED. SMPS implementation
with Microchip products can be analog, digital or mixed
signal based solutions.
An LED will have a forward voltage drop across its
terminals for a given current drive level. The power supply
voltage and the LED forward voltage characteristics
determine the SMPS topology that is required. Multiple
LEDs can be connected in series to increase the forward
voltage drop at the chosen drive current level.
The SMPS circuit topologies adopted to regulate current
in LED lighting applications are the same used to control
voltage in a power supply application. Each type of SMPS
topology offers the system designer trade-offs as shown
in the table below.
www.microchip.com/lighting
Common SMPS Topologies Useful for LED Lighting
Enabling LED Lighting Applications
Regulator
Topology
Charge Pump
Buck
Boost
SEPIC
Buck-Boost
Flyback
10
Automotive Capabilities
-V
V
V
OUT
OUT
OUT
Relationship
Depends on
transformer
V
V
V
IN
IN
IN
< V
< V
< V
to V
> V
< V
IN
IN
IN
With the advances in
technology, LED lighting is
being used in both interior
and exterior applications
within the vehicle. LEDs
deliver long life, durability
and efficiency. For example
OUT
OUT
< V
< V
OUT
< V
OUT
OUT
OUT
Complexity
Medium
Medium
Medium
Medium
Medium
Low
Component
Medium
Medium
Medium
Medium
Medium
Count
High
LED Application Using PIC MCUs
Automotive Ambient Lighting Module
Reference Design (APGRD004)
by a master body controller via a LIN bus. These
modules are offered in a very compact form-factor
board and are comprised of a PIC12F615 MCU, an
MCP2021 LIN transceiver/voltage regulator, and RGB
LED. LIN commands are interpreted by the module
to control color mixing (16,383 colors) and intensity
(1023 levels). The kit ships with 4 modules to assign
as lighting zones in a LIN or J2602 network. These
modules can also be used in conjunction with the
APGDT001 LIN Serial Analyzer to quickly create a
working LIN network straight out of the box.
9-13V DC
Limited I
No inductors
Chopped I
High side drive
Extra parts needed to isolate output from input
Smooth I
Multiple outputs
Two inductors
Single inductor
Up to four switches
Transformer can provide electrical isolation
Multiple outputs possible
ADC Input
Color Set
Interface
The Automotive Ambient Interior
Lighting Module Reference Design
demonstrates microcontroller-based
control of RGB LED devices. This
module can be controlled remotely
OUT
User
IN
IN
range
Family
PIC12
Comments
R
RGB LED
50 mA
G
B