APGRD004 Microchip Technology, APGRD004 Datasheet - Page 9

• Manufacturer Part Number: APGRD004
• Description: REF DESIGN MOD AUTO AMBNT LIGHT
• Manufacturer: Microchip Technology

Specifications of APGRD004

• Main Purpose: Lighting, RGB LED Controller
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP2021, PIC12F615
• Primary Attributes: 4 Tiny Boards, Each Have: RGB LED, LIN Transceiver, Voltage Regulator, MCU
• Secondary Attributes: LIN Commands are Interpreted to Control 16,383 Colors and 1,023 Dimming Levels
• Silicon Manufacturer: Microchip
• Silicon Core Number: APGDT001
• Kit Contents: 4 Ambient Lighting Modules, Documentation
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Generating PWM Control Signals
There are multiple ways to generate PWM control signals to
control power circuits.
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Buck LED Driver Using a Comparator
RGB Color LED Application Using PIC12HV615
www.microchip.com/lighting
LED Lighting Solutions
Devices with the Capture-Compare-PWM (CCP) module
can generate PWM signals to control power circuits using
an on-chip digital timebase. The signal pulse width is
controlled by the MCU clock and a duty cycle register.
The Enhanced CCP (ECCP) module allows one PWM signal
to control 2 or 4 output pins for half-bridge or H-bridge
control, respectively.
Devices that have a comparator and the ECCP module
can use the comparator signal to control the turn-off time
of the PWM signal.
Devices with comparators and a PWM SR latch can use
comparator signals and/or clock pulses to turn the latch
output on and off.
Other Device Options:
PIC12F1822
PIC16F1827
Other Device Options:
PIC12F1822
PIC16F1823
V
IN
V
BUS
Drive
Level
ADC Input
Color Set
V
Interface
DD
User
PIC12HV615
–
+
Comparator
+
-
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A PIC microcontroller with an on-chip comparator such as
the PIC12F609 can be used to implement a simple LED
driver. The PIC12HV609 adds an internal regulator, allowing
operation from a DC bus higher than 5 volts.
Literature on the Web
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PIC12HV615
An external PWM peripheral IC may be used. This option
is useful when multiple high speed PWM channels are
required.
PWM signals can be generated using software and I/O
pins. This option is less costly when PWM frequency and
duty cycle resolution requirements are not too high.
AN874 – Buck Configuration High-Power LED Driver,
DS00874
AN1074 – Software PWM Generation for LED Dimming
and RGB Color Applications, DS01074
Buck Topology
Driver
V
SS
LED Lighting Solutions Design Guide
R
RGB LED
50 mA
G
B
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