Instrukcja obsługi Microchip MIC2870YFT
Microchip
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MIC2870YFT
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MIC2870 Evaluation Board
1.5A Synchronous Boost Flash LED Driver
with I
2
C Interface
Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 944 0800 • fax + 1 (408) 474 1000 • San - - http://www.micrel.com
September 24, 2013
Revision 1.2
General Description
The MIC2870 is a high current, high efficiency flash LED - -
driver for one or two high brightness camera flash LEDs. -
The LED driver current is generated by an integrated
inductive boost converter with 2MHz switching frequency
which allows the use of very small inductor and output
capacitor. These features make the MIC2870 an ideal
solution for high resolution camera phone LED flash light -
driver applications.
MIC2870 supports two 750mA w LEDs (WLEDs) or a hite-
single 1.5A WLED configuration. When two WLEDs are
connected, their current are matched automatically.s
MIC2870 operates in either flash or torch modes that can
be controlled through either I2C interface or external pins.
The brightness in the flash and torch mode can be
adjusted via two external resistors individually. High-speed
mode I2C interface provides a simple control at a clock
speed up to 3.4MHz to support most camera functions
such as auto focus, white balance, and image c- apture.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Requirements
The MIC2870 evaluation board requires a bench input
power source that is adjustable from 2.7V to 5.0V and is
able to deliver greater than 4.5A at 2.7V.
Precautions
The evaluation board does not have reverse polarity
protection. Applying a negative voltage across the VIN
terminal to GND terminal may damage the device. The
MIC2870 evaluation board is tailored for a Li ion range -
input supply voltage. It should not exceed 5.0V on the
input.
Getting Started
1. Connect external supply to the VIN terminals.
Apply desired input voltage to the VIN (J1) and ground
(J2) terminals of the evaluation board, paying careful
attention to polarity and supply range (2.7V to 5.0V).
An ammeter may be placed between the power supply
and the input terminal of the evaluation board. Ensure
that the supply voltage is monitored at the input
terminals. The r and /or power lead resistance ammete
can reduce the voltage supplied to the input.
2. Enable/Disable the MIC2870.
The MIC2870 evaluation board has an enable (EN) pin
(J5). The MIC2870 is in standby mode when the EN
pin is asserted . Setting a jumper at TP1 can high
connect the high resistor. EN pin to VIN through a pull-
If this pin is driven low for more than 1s, the IC is
shutdown. This pin is pulled down by an internal
resistor. Alternatively, the IC can be enabled or
disabled by software through I2C interface.
3. Enable/Disable the torch mode.
The TEN (J3) is the torch mode enable pin. When this
pin is high, torch m Setting a jumper the ode is initiated.
at TP4 can connect TEN pin to VIN through a resistor.
If this pin is left floating, -it is pulled down internally by a
built-in 1µA current source when the device is
enabled. Alternatively, the torch mode can be enabled
or disabled by software through I2C interface.
4. Enable/Disable the flash mode.
The FEN (TP2 upper pin) is the flash mode enable pin.
A low- -to high transition at this pin initiates the flash
mode and the flash mode timer. Setting a jumper at
TP2 can connect FEN to VIN through a resistor. If this
pin is left floating, -it is pulled down internally by a built-
in 1µA current source when the device is enabled.
Alternatively, the flash mode can be enabled or
disabled by software through I2C interface.
Ordering Information
Part Number Description
MIC2870YFT EV MIC2870 Evaluation Board
MICUSB Dongle EV I2C Serial Programmer Board
Specyfikacje produktu
| Marka: | Microchip |
| Kategoria: | nieskategoryzowany |
| Model: | MIC2870YFT |
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