Microchip MIC2874YCS Manual

Microchip Ikke kategoriseret MIC2874YCS

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Side 1/16
MIC2874 Evaluation Board
1.2A High Brightness Flash LED Driver with -
Single-Wire Serial Interface
General Description
The MIC287 current, high iency flash LED 4 -is a high -effic
driver that operate s in both torch and sflash mode .
MIC2874 -has a built in internally compensated current-
mode PWM 4 MHz boost converter that allows the usage of
very small inductors and output capacitors. It is used to
step up the supply voltage to a high enough voltage at the
OUT pin to drive the LED current when the supply voltage
is lower than the required output voltage. When the supply
voltage exceeds the required output voltage, the
synchronous switch of the converter is fully turned on and
the LED driver operates in linear mode. 4 MIC287 also
features a configurable safety timer that automatically
shuts d he LED current after the set duration haown t s
expired if the programmed LED current exceeds a certain
current threshold. These features make the MIC2874 an
ideal solution for high resolution camera phone LED flash -
light driver applications.
The MIC287 n be controlled through the single4 ca -wire
serial interface and/or external control pins. A robust
single-wire serial interface allows simple control by the
host processor to support typical camera functions such as
auto-focus, white balance, and image capture.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Requirements
The MIC2874 evaluation board requires a bench input
power source that is adjustable from 2.7V 5to 5. V and is
able to deliver greater than 4.5 amps at 2.7 volts.
Precautions
The evaluation board does not have reverse polarity
protection. Applying a negative voltage across the PVIN
terminal to PGND terminal may damage the device. The
MIC287 evaluat4 ion board is tailored for a Lithium-ion
range input supply voltage. It should not exceed 5.5V on
the input.
Getting Started
1. P Connect external supply to the VIN terminals.
Apply desired input voltage to the PVIN (J1) and
PGND (J2) terminals of the evaluation board, paying
careful attention to polarity and supply range. Since
the default etection threshold voltage is low-b dattery
3.0V, the supply voltage should be set between 3.0V
and 5.5V when testing the MIC287 without using 4 the
single he ow attery et-wire interface. T l -b d ection
threshold can be set to another value or disabled via
single-wire interface. An ammeter may be connected
between the power and the supply positive terminal
evaluation board PVIN terminal. Ensure that the
supply voltage is monitored across the PVIN and
PGND terminals. The ammeter and /or power lead
resistance can reduce the input voltage supply.
2. 4. Enable/Disable the MIC287
The MIC287 evaluation board has an enable4 (DC) pin
( JP2 J4 or lower pin in idle ). The MIC2874 is enabled
( ) standby mode when the DC pin is asserted high.
Setting a jumper at JP2 can connect the DC pin to
PVIN. If this pin is driven low for more than 405µs, the
IC will shut down. Alternatively, the IC can be enabled
or disabled by software through single- wire interface.
3. mode. Enable/Disable the flash
The FEN (J5 or JP3 lower pin) is the flash mode
enable pin. A low high transition at pin initiates - -to this
the flash mode and the safety timer. Setting a jumper
at J PP3 can connect FEN to VIN. If FEN pin is left
floating, it will be pulled down internally by built- µin 1 A
current source when the device is enabled.
Alternatively, the can be enabled or flash mode
disabled by software through single- wire interface.
4. Graphic user interface support.
Graphical user interface software can be used with the
MICUSB Dongle EV for configuring and testing of the
MIC2874 with a standard computer. For more detail,
refer to the MIC2874 Evaluation Software section.
Ordering Information
Part Number Description
MIC287 MIC2874Y EV CS 4 Evaluation Board
MICUSB I2C Serial Programmer Board
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 27, 2014 Revision 1.0

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: MIC2874YCS

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