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參數(shù)資料
| 型號： | SC623EVB |
| 廠商： | Semtech Corporation |
| 英文描述： | LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and SemWireTM Interface |
| 中文描述： | LED燈管理股電荷泵，4個LED，400mA的閃光LED，并SemWireTM接口 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大?。?/td> | 287K |
| 代理商： | SC623EVB |
SC623
12
Applications Information (continued)
Backlight Quiescent Current
The quiescent current required to operate all four
backlights is reduced by 1.5mA when backlight current
is set to 4.0mA or less. This feature results in higher
efficiency under light-load conditions. Further reduction
in quiescent current will result from using fewer than four
LEDs.
Fade-In and Fade-Out
Backlight brightness can be set to automatically fade-in
when current is set to increase and fade-out when current
is set to decrease. When enabled with a new current
setting, the current will step through each incremental
setting between the old and new values. The result is a
visually smooth change in brightness with a rate of fade
that can be set to 8, 16, 24, or 32 ms per step.
LED Flash and Spotlight Current Sink
A single output current sink is provided to drive both flash
and spotlight functions. In flash mode, this current sink
provides up to 400mA for a flash LED
or array of parallel
LEDs
. Flash current settings are in 50mA increments from
50mA to 400mA. The FLEN pin directly triggers the FLASH
function when pulled high, or it can be wired to VIN to
enable software control via the serial interface.
In spotlight mode, the output can be set for up to 250mA
of continuous current. Settings are available in 50mA
increments from 50mA to 250mA. Continuous operation
above 250mA is not recommended due to high power
dissipation.
Flash and Spotlight Safety Timer
A safety timer disables the flash and spotlight output
current sink if the sink remains active for an extended
period. The timer protects the SC623 and the LED from
high power dissipation that can cause overheating. The
timer’s default state is on, but the timer may be disabled
via the serial interface to allow continuous output current
in spotlight mode. The safety timer affects only the FL pin
and will turn off the sink after a period of 1 second. The
timer may be reset by either forcing the FLEN pin low
or by resetting the Flash/Spotlight control bits via the
interface.
Shutdown State
The device is disabled when the SWIF pin is low. All
registers are reset to default condition when SWIF is low.
Sleep Mode
When all LEDs are off, sleep mode is activated. This is a
reduced current mode that helps minimize overall current
consumption by turning off the clock and the charge
pump while continuing to monitor the serial interface for
commands.
SemWire Single Wire Interface Functions
All device functions can be controlled via the SemWire
single wire interface. The interface is described in detail
in the SemWire
Interface section
of the datasheet.
Protection Features
The SC623 provides several protection features to
safeguard the device from catastrophic failures. These
features include:
Output Open Circuit Protection
Over-Temperature Protection
Charge Pump Output Current Limit
LED Float Detection
Output Open Circuit Protection
Over-Voltage Protection (OVP) is provided at the VOUT
pin to prevent the charge pump from producing an
excessively high output voltage. In the event of an open
circuit at VOUT, the charge pump runs in open loop and
the voltage rises up to the OVP limit. OVP operation is
hysteretic, meaning the charge pump will momentarily
turn off until V
OUT
is sufficiently reduced. The maximum
OVP threshold is 6.0V, allowing the use of a ceramic
output capacitor rated at 6.3V with no fear of over-voltage
damage.
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相關(guān)代理商/技術(shù)參數(shù) |
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| SC623ULTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, and SemWireTM Interface |
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| SC624_09 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs,and SemWireTM Interface |
| SC624A | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and I2C Interface |
| SC624A_09 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs,and I2C Interface |
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