参数资料
型号: MIC2842AYMT TR
厂商: Micrel Inc
文件页数: 11/14页
文件大小: 0K
描述: IC LED DRIVR WHITE BCKLGT 10TMLF
标准包装: 1
拓扑: 线性(LDO)
输出数: 4
内部驱动器:
类型 - 主要: 背光,闪灯/白光
类型 - 次要: 白色 LED
电源电压: 3 V ~ 5.5 V
安装类型: 表面贴装
封装/外壳: 10-UFDFN 裸露焊盘,10-TMLF?
供应商设备封装: 10-TMLF?(2x2)
包装: 标准包装
工作温度: -40°C ~ 125°C
产品目录页面: 1082 (CN2011-ZH PDF)
其它名称: 576-3472-6
Micrel Inc.
MIC2842A
(2μs to 32μs). Figure 15 illustrates the proper timing for
execution of a One-Step Brightness Increase.
Figure 12. Down Counter Roll-Over
Similarly, when the counter mode is set to Count Up and
a programming pulse forces the brightness level to step
up from level 48, then the counter will roll-over to level 0
as illustrated in Figure 13.
Figure 13. Up Counter Roll-Over
Figure 15. One-Step Brightness Increase
Presetting Brightness
Presetting the brightness will allow the MIC2842A start-
up at any brightness level (0 to 48). The MIC2842A does
not turn on the linear LED driver until the DC pin is kept
high for t START_UP (140μs). This grants the user time to
preset the brightness level by sending a series of
programming edges via the DC pin. The precise timing
for the first down edge is between 5μs to 75μs after the
DC pin is first pulled high. The 70μs timeframe between
5μs and 75μs is the t PROG_SETUP period. The first
presetting pulse edge must occur somewhere between
the timeframe of 5μs to 75μs, otherwise the MIC2842A
may continue to start up at the full (default) brightness
level.
One-Step Brightness Changes
The “One-Step” brightness change procedure relieves
the user from keeping track of the MIC2842A’s up/down
counter mode. It combines a Mode Change with a
programming edge; therefore, regardless of the previous
Count Mode, it will change the brightness level by one.
Figure 16. Presetting Timing
Figure 16 shows the correct presetting sequence to set
the MIC2842A brightness to level 39 prior to start up.
Notice that when using the presetting feature the first
Figure 14. One-Step Brightness Decrease
The One-Step Brightness Decrease method is quite
simple. First, the DC pin is pulled low for a period equal
to the t MODE_DOWN (420μs to 500μs) and immediately
followed by a falling edge within t PROG_HIGH (2μs to 32μs)
as shown in Figure 14. This will decrease the brightness
level by 1. Similarly a One-Step Brightness Increase can
be assured by first generating a DC down pulse whose
period is equal to the t MODE_UP (100μs to 160μs) and
immediately followed by a falling edge within t PROG_HIGH
programming pulse is not ignored. This is because the
counter’s default mode is Count Down and a Mode
Change cannot be performed in the presetting mode.
(Note that the t PROG_HIGH and t PROG_LOW pulse width must
still be between 2μs to 32μs.)
August 2009
11
M9999-080309-D
相关PDF资料
PDF描述
MIC2843YMT TR IC LED DRIVER PWM CONTROL 10TMLF
MIC2844AYMT TR IC LED DRIVR WHITE BCKLGT 10TMLF
MIC2845A-MFYMT TR IC LED DRIVR WHITE BCKLGT 14TMLF
MIC2846A-MFYMT TR IC LED DRIVR WHITE BCKLGT 14TMLF
MIC2981/82YWM TR IC SOURCE DRIVER ARRAY HC 18SOIC
相关代理商/技术参数
参数描述
MIC284-2BM 功能描述:IC SUPERVISOR THERM 2ZONE 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:SilentSense™ 标准包装:2,500 系列:SilentSense™ 功能:温度监控系统(传感器) 传感器类型:内部和外部 感应温度:-55°C ~ 125°C,外部传感器 精确度:±2°C 本地(最大),±3°C 远程(最大) 拓扑:ADC(三角积分型),比较器,寄存器库 输出类型:I²C?/SMBus? 输出警报:是 输出风扇:是 电源电压:2.7 V ~ 5.5 V 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-TSSOP,8-MSOP(0.118",3.00mm 宽) 供应商设备封装:8-MSOP 包装:带卷 (TR) 其它名称:MIC284-2BMMTRMIC284-2BMMTR-ND
MIC284-2BM TR 功能描述:IC SUPERVISOR THERM 2ZONE 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:SilentSense™ 标准包装:1 系列:- 功能:温度监控系统(传感器) 传感器类型:内部和外部 感应温度:-40°C ~ 125°C,外部传感器 精确度:±2.5°C 本地(最大值),±5°C 远程(最大值) 拓扑:ADC,比较器,寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6
MIC284-2BMM 功能描述:IC SUPERVISOR THERM 2ZONE 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:SilentSense™ 标准包装:2,500 系列:SilentSense™ 功能:温度监控系统(传感器) 传感器类型:内部和外部 感应温度:-55°C ~ 125°C,外部传感器 精确度:±2°C 本地(最大),±3°C 远程(最大) 拓扑:ADC(三角积分型),比较器,寄存器库 输出类型:I²C?/SMBus? 输出警报:是 输出风扇:是 电源电压:2.7 V ~ 5.5 V 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-TSSOP,8-MSOP(0.118",3.00mm 宽) 供应商设备封装:8-MSOP 包装:带卷 (TR) 其它名称:MIC284-2BMMTRMIC284-2BMMTR-ND
MIC284-2BMM TR 功能描述:IC SUPERVISOR THERM 2ZONE 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:SilentSense™ 标准包装:2,500 系列:SilentSense™ 功能:温度监控系统(传感器) 传感器类型:内部和外部 感应温度:-55°C ~ 125°C,外部传感器 精确度:±2°C 本地(最大),±3°C 远程(最大) 拓扑:ADC(三角积分型),比较器,寄存器库 输出类型:I²C?/SMBus? 输出警报:是 输出风扇:是 电源电压:2.7 V ~ 5.5 V 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-TSSOP,8-MSOP(0.118",3.00mm 宽) 供应商设备封装:8-MSOP 包装:带卷 (TR) 其它名称:MIC284-2BMMTRMIC284-2BMMTR-ND
MIC284-2YM 功能描述:板上安装温度传感器 2-zone thermal supervisor w/over-temp output; SOIC-08 - Lead Free RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor