MIC2873YCS Evaluation Board User Guide

MIC2873 Evaluation Board
1.2A High-Brightness Flash LED Driver with
Single-Wire Serial Interface
General Description
Getting Started
The MIC2873 is a high-current, high-efficiency flash LED
driver which can operate in either torch or flash mode. The
MIC2873 has a built-in, internally-compensated, currentmode PWM 2MHz boost converter which allows for the
use of a very small inductor and output capacitor for
stepping up the supply voltage to a high enough value at
the OUT pin to drive the LED current. If the supply voltage
is high enough, the synchronous switch of the converter is
then fully turned-on and the LED driver operates in linear
mode. MIC2873 also features a configurable safety timer
which automatically shuts down the LED current after the
safety timer duration is expired if the programmed LED
current exceeds a certain current threshold. These
features make the MIC2873 an ideal solution for highresolution camera phone LED flashlight driver applications.
1. Connect external supply to the PVIN terminals.
The MIC2873 can be controlled through the single-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.
2. Enable/Disable the MIC2873.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Requirements
The MIC2873 evaluation board requires a bench input
power source that is adjustable from 2.7V to 5.5V 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 PVIN
terminal to PGND terminal can damage the device. The
MIC2873 evaluation board is tailored for a Li-ion range
input supply voltage. It should not exceed 5.5V on the
input.
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 low-battery detection threshold voltage is
3.0V, the supply voltage should be set to within 3.0V to
5.5V when testing the MIC2873 without using software
via the single-wire interface (low-battery detection
threshold can be set to another value or disabled thru
software). An ammeter may be connected between the
power supply positive terminal and the 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
voltage supplied to the input.
The MIC2873 evaluation board has an enable (DC) pin
(J4 or JP2 lower pin). The MIC2873 is enabled in idle
(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 is shutdown. Alternatively, the IC can be enabled or
disabled by software through single-wire interface.
3. Enable/Disable the flash mode.
The FEN (J5 or JP3 lower pin) is the flash mode
enable pin. A low-to-high transition at this pin initiates
the flash mode and the safety timer. Setting jumper at
JP3 can connect FEN to PVIN. If FEN pin is left
floating, it will be pulled-down internally by built-in 1µA
current source when the device is enabled.
Alternatively, the flash mode can be enabled or
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
MIC2873 with a standard computer. For more detail,
refer to the MIC2873 Evaluation Software section.
Ordering Information
Part Number
Description
MIC2873YCS EV
MIC2873 Evaluation Board
MICUSB
I C Serial Programmer Board
2
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 25, 2014
Revision 1.0
Micrel, Inc.
MIC2873 Evaluation Board
Evaluation Board Description
Low-Battery Voltage Detection (LBVD)
When the VIN voltage drops below the low-battery voltage
detection (LBVD) threshold (default = 3.0V) in flash or
torch mode, the LED current driver is disabled. The LED
driver can be resumed by raising the VIN above the LVBD
threshold and toggling the corresponding flash or torch
command. The LBVD threshold is adjustable thru the
LBVD control register (Address 4).
Overvoltage Protection
When the output voltage rises above an internal
overvoltage protection (OVP) threshold, MIC2873 is
latched off automatically to avoid permanent damage to
the IC. To clear the latched off condition, either power
cycle the MIC2873 or assert the DC pin low.
Short-Circuit Detection
Each time before enabling the LED driver, the MIC2873
performs the short-circuit test by driving the flash LED with
a small (2mA typical) current for 200µs. If (VOUT – VLED) <
1.7V at the end of the short-circuit test, the LED is
considered to be shorted and MIC2873 will ignore the flash
and/or torch mode command. Note that the short-circuit
test is carried out every time prior to flash and torch mode
but the result is not latched.
Figure 1. MIC2873 Evaluation Board
Flash Mode
The maximum current level in the flash mode is 1.2A. The
flash mode current can be initiated by asserting FEN pin
high, or by setting the flash control register (Address 1)
through the single-wire interface, for the desired flash
duration, subjected to the safety timeout setting. The flash
mode current is terminated when the FEN pin is brought
low and the flash register is cleared, or when the
configurable safety timer expires.
Thermal Shutdown
When the internal die temperature of MIC2873 reaches
155°C, the LED driver is disabled until the die temperature
falls below 140°C and either FEN pin, FEN register, TEN
register, or VIN is toggled.
Single-Wire Interface
The single-wire interface allows the use of a single
multiplexed enable and data pin (DC) for control and
communication in GPIO limited applications. The interface
is implemented using a simple mechanism allowing any
open drain or directly driven GPIO to control the MIC2873.
Flash mode current can be adjusted to a fraction of the
maximum flash mode current level by selecting the desired
value in the flash control register through the single-wire
serial interface.
Torch Mode
By default, the maximum torch mode level is 300mA. The
torch mode operation is activated by setting the torch
control register (Address 2) for the desired duration. The
torch mode current is terminated when the torch register is
cleared or when the configurable safety timer expires.
The MIC2873 uses the single-wire interface for simple
command and control functions. The interface provides
fast access to write only registers with protection features
to avoid potentially erroneous data writes and improve
robustness. When DC is in a low state and no data is
detected for longer than 405µs, the MIC2873 will
automatically go into a low-power SHUTDOWN state,
simultaneously resetting internal registers to default states.
Like the flash mode current, the torch mode current can be
set to a fraction of the maximum torch mode current level
by selecting the desired torch current in the torch control
register (Address 2) through the single-wire serial
interface.
Configurable Safety Timer
The safety timeout feature automatically shuts down the
LED current after the safety timer duration is expired if the
programmed LED current exceeds a certain current
threshold. Both the current threshold and the timer
duration are programmable via the safety timer registers
(Addresses 3 and 5).
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MIC2873 Evaluation Board
Overview
The single-wire interface relies on a combination of bit
edges and the period between edges in order to
communicate across a single wire. Each word is
transmitted as a series of pulses, with each pulse
incrementing an internal data counter. A stop sequence
consisting of an inactive period of DC pin remaining high is
used to latch the data word internally. An address and data
framing format is used to improve protection against
erroneous writes by enforcing address and data field
lengths as well as the timing duration between them.
IDLE
< TEND - TLAT
VH
VL
TLAT
TEND
VH
VL
TLAT
TEND
SHUTDOWN
Timing is designed such that when communicating with a
device using a low-cost on-chip oscillator, the worst case
minimum and maximum conditions can be easily met
within the wide operating range of the oscillator. Using this
method guarantees that the device can always detect the
delay introduced by the communication master.
VH
VL
TLAT
TEND
IDLE
Idle States and Error Conditions
In shutdown mode, the MIC2873 is in a reset condition
with all functions off while consuming minimal power.
Register settings are reset to default state when coming
out of shutdown state. In idle mode, all register settings
persist and all MIC2873 functions continue in their current
state. Table 1 summarises the difference between the two
idle modes:
Figure 2. Abort, Shutdown, and Idle Timing Waveforms
Communication Details
The serial interface requires delimiters to indicate the start
of frame, data as a series of pulses, and end of frame
indicated by a lack of activity for longer than TLAT. The
start of frame is the first high-to-low transition of DC when
in idle mode. The first rising edge resets the internal data
counter to 0.
Table 1. Differences between Idle Modes
Mode
Shutdown
Idle
VDC
Low
High
ISUPPLY
(all functions off)
1μA
230μA
Register State
Default
Persist
Start-Up Time
1μs
100ns
END OF
FRAME
1 COUNT
VH
VL
TOFF
TON
TON+TOFF<TLAT
START
Idle mode is entered automatically at the end of a
communication frame by holding DC high for ≥TEND, by
enabling the device by bringing DC high when in shutdown
mode, or when an error is detected by the single-wire
interface logic.
TLAT
AUTOMATIC LATCH
AFTER TLAT EXPIRES
Figure 3. Data Word Pulse Timing
A pulse is delimited by the signal first going below VL and
then above VH within the latch timeout TLAT. During this
transition, minimum on (TON) and off (TOFF) periods are
observed to improve tolerance to glitches. Each rising
edge increments the internal data register. Data is
automatically latched into internal shadow address or data
registers after an inactivity period of DC remaining high for
longer than TLAT.
Shutdown mode can be entered at any time by pulling
down DC for ≥TEND, discarding any current communication
and resetting the internal registers. If a communication is
received before the shutdown period, but after the TLAT
period, the communication is discarded. This state is also
used to create an internal error state to avoid erroneously
latching data where the communication process cannot be
serviced in time. Additionally, each register has a
maximum value associated with it. If the number of bits
clocked in exceeds the maximum value for the register, the
data is assumed to be in error and the data is discarded.
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IDLE
To send register write commands, the address and data
are entered in series as two data words using the above
pattern, with the second word starting after the first latch
period has expired. After the second word is entered, the
IDLE command should be issued by leaving the DC pin
high for ≥TEND to indicate the stop sequence of the
address/data words frame.
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Micrel, Inc.
MIC2873 Evaluation Board
After receiving the stop sequence, the internal registers
decode and update cycle is started, with the shadow
register values being transferred to the decoder. Figure 4
shows an example of entering a write of data 5 to Address
3.
The flash current register maps into the internal FEN and
FCUR registers as shown in Table 3. Table 3 also
describes the relationship between the flash current and
the FCUR register setting.
Table 3. Flash Current Register Mapping into Internal FEN
and FCUR Registers, and Relationship between Flash
Current and the FCUR Register Setting
ADDRESS/DATA FRAME
LATCH
START
LATCH
START
TLAT
TLAT
< TEND
0 1 2 3
FEN/FCUR[4:0] Value
END
REGISTER
WRITE
0 1 2 3 4 5
> TEND
Figure 4. Communication Timing Example of Entering Write
for Data 5 to Address 3
Only correctly formatted address/data combination will be
treated as a valid frame and processed by the MIC2873.
Any other input, such as a single data word followed by
TEND, or three successive data words will be discarded by
the target hardware as an erroneous entry. Additionally,
any register write to either an invalid register or with invalid
register data will also be discarded.
MIC2873 Registers
The MIC2873 supports five writeable registers for
controlling the torch and the flash modes of operation as
shown in Table 2. Note that register addressing starts at 1.
Writing any value above the maximum value shown for
each registers will cause an invalid data error and the
frame will be discarded.
Table 2. Five Writeable Registers of MIC2873
IFLASH (A)
Dec.
Binary
FEN[4]
FCUR[3:0]
0
00000
0
0000
1.200
1
00001
0
0001
1.150
2
00010
0
0010
1.100
3
00011
0
0011
1.050
4
00100
0
0100
1.000
5
00101
0
0101
0.950
6
00110
0
0110
0.900
7
00111
0
0111
0.850
8
01000
0
1000
0.800
9
01001
0
1001
0.750
10
01010
0
1010
0.700
11
01011
0
1011
0.650
12
01100
0
1100
0.600
13
01101
0
1101
0.550
14
01110
0
1110
0.400
15
01111
0
1111
0.250
16
10000
1
0000
1.200
17
10001
1
0001
1.150
18
10010
1
0010
1.100
19
10011
1
0011
1.050
Address
Name
Maximum
Value
Description
20
10100
1
0100
1.000
1
FEN/FCUR
31
Flash Enable/Current
21
10101
1
0101
0.950
2
TEN/TCUR
31
Torch Enable/Current
22
10110
1
0110
0.900
3
STDUR
7
Safety Timer Duration
23
10111
1
0111
0.850
9
Low-Battery Voltage
Detection Threshold
24
11000
1
1000
0.800
25
11001
1
1001
0.750
5
Safety Timer
Threshold
26
11010
1
1010
0.700
27
11011
1
1011
0.650
28
11100
1
1100
0.600
29
11101
1
1101
0.550
30
11110
1
1110
0.400
31
11111
1
1111
0.250
4
5
LB_TH
ST_TH
Flash Current Register (FEN/FCUR: default 0)
The flash current register enables and sets the flash mode
current level. Valid values are 0 to 31; values 0 − 15 will
set the flash current without enabling the flash (such that it
can be triggered externally), values 16 − 31 will set the
flash current and enable the flash.
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MIC2873 Evaluation Board
Torch Current Register (TEN/TCUR: default 0)
The torch current register enables and sets the torch mode
current level. Valid values are 0 to 31; values 0 − 15 will
set the torch current without enabling the torch (such that it
can be triggered by setting the internal TEN register value
to 1), values 16 − 31 will set the torch current and enable
the torch. A value of 0 at the internal TEN register will
disable the torch. The torch current register maps into the
internal TEN and TCUR registers as shown in Table 4.
Table 4 also describes the relationship between the torch
current and the TCUR register setting.
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Table 4. Torch Current Register Mapping into Internal
TEN and TCUR Registers, and Relationship between
Torch Current and the TCUR Register Setting
TEN/TCUR[4:0] Value
5
ITORCH (mA)
Dec.
Binary
TEN[4]
TCUR[3:0]
0
00000
0
0000
300.0
1
00001
0
0001
287.5
2
00010
0
0010
275.0
3
00011
0
0011
262.5
4
00100
0
0100
250.0
5
00101
0
0101
237.5
6
00110
0
0110
225.0
7
00111
0
0111
212.5
8
01000
0
1000
200.0
9
01001
0
1001
187.5
10
01010
0
1010
175.0
11
01011
0
1011
162.5
12
01100
0
1100
150.0
13
01101
0
1101
137.5
14
01110
0
1110
100.0
15
01111
0
1111
62.5
16
10000
1
0000
300.0
17
10001
1
0001
287.5
18
10010
1
0010
275.0
19
10011
1
0011
262.5
20
10100
1
0100
250.0
21
10101
1
0101
237.5
22
10110
1
0110
225.0
23
10111
1
0111
212.5
24
11000
1
1000
200.0
25
11001
1
1001
187.5
26
11010
1
1010
175.0
27
11011
1
1011
162.5
28
11100
1
1100
150.0
29
11101
1
1101
137.5
30
11110
1
1110
100.0
31
11111
1
1111
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Micrel, Inc.
MIC2873 Evaluation Board
Safety Timer Duration Register (STDUR: Default 7)
The safety timer duration register sets the duration of the
flash and torch mode when the LED current exceeds the
programmed threshold current. Valid values are 0 for the
minimum timer duration to 7 for the maximum duration.
Safety Timer Threshold Current Register
(ST_TH: Default 4)
Safety timer threshold current determines the amount of
LED current flowing through the external LED before the
internal LED safety timer is activated. Setting ST_TH to 0
disables the safety timer function, and setting the register
to values 1 to 5 set the safety time threshold current
100mA to 300mA in 50mA steps.
Table 5. Safety Timer Duration Register Setting and Safety
Timer Duration
Value
Dec.
Binary
STDUR[2:0]
(binary)
0
000
000
156.25
1
001
001
312.5
Dec.
Binary
2
010
010
468.75
0
3
011
011
625
4
100
100
5
101
6
7
Timeout (ms)
Table 7. Safety Timer Threshold Current Register Setting
and Safety Timer Threshold Current
Value
ST_TH[2:0]
Safety Timer Threshold
Current (mA)
000
000
Disabled
1
001
001
100
781.25
2
010
010
150
101
937.5
3
011
011
200
110
110
1093.75
4
100
100
250
111
111
1250
5
101
101
300
Low-Battery Threshold Register (LB_TH: Default 1)
The LB_TH register sets the supply threshold voltage
below which the internal low battery flag is asserted, and
the LED current driver is disabled. Table 6 shows the
threshold values that correspond to the register settings.
Setting 0 is reserved for disabling the function, and
settings between 1 and 9 inclusively enable and set the
LB_TH value between 3.0V and 3.8V with 100mV
resolution.
Table 6. Low-Battery Threshold Register Setting and Supply
Threshold Voltage
Value
LB_TH[3:0]
VBAT Threshold (V)
0000
0000
Disabled
1
0001
0001
3.0
2
0010
0010
3.1
3
0011
0011
3.2
4
0100
0100
3.3
5
0101
0101
3.4
6
0110
0110
3.5
7
0111
0111
3.6
8
1000
1000
3.7
9
1001
1001
3.8
Dec.
Binary
0
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MIC2873 Evaluation Board
Evaluation Kit Overview
The MIC2873 can be operated as a standalone board or
as a modular system where the evaluation board is
connected to a PC via single-wire-to-USB interface board
(MICUSB Dongle EV).
MIC2873 Evaluation Software
The MIC2873 evaluation software provides a graphic user
interface (GUI) to program the MIC2873 evaluation board.
A complete application note on the installation and
operation of the evaluation software and the USB adapter
user manual can be downloaded from Micrel’s web site at
www.micrel.com. The evaluation software can write to
registers inside the MIC2873 IC device via the single-wire
interface for enabling or disabling the device, torch mode,
flash mode; changing the WLEDs’ brightness in torch
mode and flash mode; changing the safety timer duration
and LED current threshold; enabling/disabling breath and
strobe special effects.
Connecting the USB-to-Single-Wire Adapter
When interfacing the MIC2873 evaluation board with the
MICUSB Dongle, carefully match the GND pin of the
evaluation board with the GND pin of the dongle (as
shown in Figure 5, the MICUSB Dongle should be faced
down). On the MIC2873 evaluation board, the GND pin is
the first pin of the connector receptacle (JP1) as counting
from the left side. The MICUSB Dongle has GND labeled
on both sides of the adapter board.
Getting Started
1. Download the MIC2873 evaluation software and run
setup.exe file. This step may take some time and
require an internet connection to update the computer
to .NET Framework 3.5.
2. Install the MICUSB Dongle EV driver from FTDI.
Double-click on the file CDM20828_setup.exe. The
latest driver can be downloaded from the FTDI
website: www.ftdichip.com.
3. After installing the driver, locate the virtual COM port
created by the FTDI driver in the Device Manager
Menu, under Ports (COM & LPT). The corresponding
port will have FTDI listed as the manufacturer.
4. Connect the MIC2873 evaluation board to the PC via
the MICUSB Dongle EV. Remove the jumpers on JP2
and JP3 on the evaluation board. Power the MIC2873
evaluation board PVIN input.
5. Set the mini slide switch SW1 on the MICUSB Dongle
EV. The SW1 should be toggled to the NOM position
as shown in Figure 6.
6. Open the MIC2873 evaluation software in Programs
under the Start Menu.
Figure 5. MIC2873 Evaluation Board Interfaces with the
MICUSB Dongle EV (adapter top side faces down)
Figure 6. Top Side of the Adapter with the Mini Slide Switch
Toggled to NOM Position
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MIC2873 Evaluation Board
Evaluation Software
The MIC2873 evaluation software GUI is shown in Figure
7 to Figure 11. When the evaluation software is just
started, it is default in offline mode as shown on the right of
the top menu bar in Figure 7. The offline mode is only for
running the software without the communication or
connection with the MIC2873 evaluation board.
At the right side of the GUI panel which is the MIC2873
control panel, user can perform the following MIC2873
operation:
1. Check or uncheck the “Enabled” option to enable or
disable the MIC2873 device.
2. Adjust the flash brightness with the Flash Brightness
Control slide bar from 1.2A to 0.25A in16 steps with.
The maximum is on the left and the minimum is on the
right.
To control the MIC2873 evaluation board with the software
GUI, the user firstly has to click the “Test” button in the
Target Config tab. If the connection from the PC to the
dongle and then to the MIC2873 EVB is fine as instructed
in “Connecting the USB-to-Single-Wire Adapter” subsection and in steps 4 and 5 in the “Getting Started” subsection, the “Target OK” will be shown up at the status bar
at the bottom of the GUI as shown in Figure 8.
3. Fire flash or reset flash by clicking the “Toggle Flash”
button.
4. Adjust the torch brightness with the Torch Brightness
Control slide bar from 300mA to 62.5mA in 16 steps.
The maximum is on the left and the minimum is on the
right.
If the connection is not good, the “Target Not Detected” will
be shown up at the status bar and the user has to check
with the cable connections before proceeding to the next
step. When the “Target OK” status is shown, the user can
click on the “Offline Mode” at the menu bar to change it to
“Direct Editing Mode”. When the “Direct Editing Mode” is
shown up at the top menu bar and the “Direct Editing
Mode Active” is indicated at the status bar as shown in
Figure 9, the software GUI allows the user to control the
operation of the MIC2873 evaluation board.
5. Set or reset torch by clicking on the “Toggle Torch”
button.
6. Change the LED Safety Timer duration setting from
156ms to 1250ms with 8 options; Change the LED
Safety Timer LED current threshold from 100mA to
300mA in 50mA step. The LED Safety Timer can also
be disabled by setting the LED current threshold to the
“Disable” option. Please refer to Table 5 and Table 7
for details.
Introduction to the GUI Panel
At the left side of the GUI panel, there are different tabs for
user to select for specific operations. The functions of the
tabs are listed below:
7. Set the Low-Battery Threshold voltage from 3.0V to
3.8V in 0.1V step. The low-battery threshold function
can be disabled by choosing the “Disabled” option.
8. Click the “Breath” button, “Strobe” button, and set
delay time options for special effects demonstration.
1. “Target Config” tab – the destination address is shown
in this tab. User can also click the “Test” button in this
tab to check and establish communication between the
evaluation board and PC.
Setting of Single-Wire Interface Data Rate
The data rate of the single-wire interface communication
can be set at the pull-down menu from the “SWI” menu at
the top menu bar as shown in Figure 11. User can set the
data rate to 100kHz, 1MHz, 3MHz, or 6MHz from the pulldown menu.
2. “Registers” tab – as show in Figure 10, user can check
with the MIC2873 registers information and perform
on-the-fly write operation to the IC registers. If the user
knows the exact valid data value to the registers, the
data value can be entered to the data edit box
corresponding to the target register and then click the
“Write” button. When the mouse curser is hovering
over the register Address, Data, or Read Only
edit/check boxes, a dynamic tooltips box will show up
to indicate the corresponding register name and the
functional name of the individual register bits.
3. “Help” tab – some hints about the steps for
establishing host communications show up inside this
tab.
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MIC2873 Evaluation Board
Figure 7. MIC2873 Evaluation Software GUI Initial Start-Up Window in Offline Mode
Figure 8. MIC2873 Evaluation Software GUI Indicating Target OK at Status Bar
Figure 9. MIC2873 Evaluation Software GUI in Direct Editing Mode
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Figure 10. MIC2873 Evaluation Software GUI with Registers Tab Selected
Figure 11. Setting Data Rate from Pulldown Menu
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MIC2873 Evaluation Board
Evaluation Board Schematic
Bill of Materials
Item
C1, C2
Part Number
C1608X5R1A475K080AC
Manufacturer
(1)
TDK
SPFCW04301BL
Samsung
LXCL-MN06-3002
Philips
SML-LXL99UWC-TR/5
Lumex
2ER103CW06000002
L1
PIFE25201B-1R0MS-39
(2)
U1
MIC2873YCS
2
High-Power Flash LED, 4.1mm × 3.9mm × 2.1mm, 220lux
@ ILED = 1A
LUXEON Flash 6 Module, 4mm × 4mm × 2.2mm,
180lux @ ILED = 1A
(3)
(4)
LED SQ 5W COOL WHT 6000K SMD, 190lm
Edison-Opto
Cyntec
Qty.
Capacitor 4.7 µF, 10V, 10%, X5R, 0603
D1
D2
Description
(5)
(6)
(7)
Micrel, Inc.
1
DNI
LED, 3W, COOL WHT 6000K SMD, 210lm
Inductor, 1.0µH, 3.55A, 2.5mm × 2.0mm × 1.2mm
1
1.2A High-Brightness Flash LED Driver with Single-Wire
Serial Interface
1
Notes:
1. TDK: www.tdk.com.
2. Samsung: www.samsung.com.
3. Philips: www.philipslumileds.com.
4. Lumex: www.lumex.com.
5. Edison-Opto: www.edison-opto.com.
6. Cyntec: www.cyntec.com.
7. Micrel, Inc.: www.micrel.com.
August 25, 2014
11
Revision 1.0
Micrel, Inc.
MIC2873 Evaluation Board
PCB Layout Recommendations
Top Layer
Bottom Layer
August 25, 2014
12
Revision 1.0
Micrel, Inc.
MIC2873 Evaluation Board
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August 25, 2014
13
Revision 1.0