參數(shù)資料
型號(hào)： STCF03PNR
廠商： 意法半導(dǎo)體
元件分類： LED驅(qū)動(dòng)器
英文描述： High power white LED driver with I2C⑩ interface
中文描述： 大功率白光LED驅(qū)動(dòng)器具有I2C⑩接口
文件頁(yè)數(shù)： 26/35頁(yè)
文件大小： 455K
代理商： STCF03PNR
Detailed description
STCF03
26/35
TRIG_EN bit, and also resets the F_RUN bit. The ATN pin is pulled down to inform the μP
that the STAT_REG has been updated.
9.5
External (μP) temporization using TRIG_EN bit
Even if it is possible, it is not recommended to use the TRIG_EN bit to start and stop the
Flash operation, because of I
2
C bus latencies: this would result in inaccurate Flash timing.
Nevertheless, if this operation mode is chosen, the TRIG pin has to be kept High (logic level
or wired to V
BAT
), leaving the whole flash control to the I
2
C bus. Also in this operation mode
the Time Counter will Time-out Flash operation and keep the LED dissipated energy
dissipated by the LED within safe limits in case of SW deadlock.
9.6
Single Flash using internal temporization
Flash triggering can be obtained either by TRIG pin (hard-triggering) or by I
2
C commands
(soft-triggering). The first solution is recommended for an accurate start time, while the
second is less accurate because of the I
2
C bus time latency. Stop time is defined by the
STCF03 internal temporization and its accuracy is determined by the internal oscillator. For
hard-triggering it is necessary to set the TRIG_EN bit in advance. For soft-triggering the
TRIG pin has to be kept High (logic level or wired to V
BAT
) and the Flash can be started by
setting the FTIM and the TRIG_EN through I
2
C (both are located in the CMD REG). There is
a delay time between the moment the Flash is triggered and when it appears. This delay is
caused by the time necessary to charge up the output capacitor, which is around 1.2 ms
depending on battery voltage and output current value. Once triggered, the flash operation
will be stopped when the Time Counter reaches zero. As soon as the Flash is finished, the
F_RUN bit is reset, the ATN pin is pulled down for 11 μs to inform the μP that the STAT_REG
has been updated and the device goes back to Ready mode. If it is necessary to make a
Flash longer than the internal timer allows or a continuous Flash, then the FTIM must be
reloaded through I
2
C bus every time, before the internal timer reaches zero. For example: To
get a continuous FLASH, set FTIM to 1.5 s and every 1 s reload the CMD_REG.
9.7
Multiple Flash using internal temporization
This operation has to be processed as a sequence of single flashes using internal
temporization starting from hard or soft triggering. Since the TRIG_EN bit is reset at the end
of each flash, it is necessary to reload the CMD_REG to start the next one.
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STCF06 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.5 A white LED driver with IC interface
STCF06TBR 功能描述:LED照明驅(qū)動(dòng)器 1.5A WHITE LED DRVR RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
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