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| 型号： | MIC2846A-PPYMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 14TMLF |
| 标准包装： | 1 |
| 拓扑： | 线性（LDO） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 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： | 14-UFQFN 裸露焊盘，14-TMLF? |
| 供应商设备封装： | 14-TMLF?（2.5x2.5） |
| 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： | 576-3480-6 |
Micrel Inc.
Count Up Mode until its mode is changed to Count Down
Mode or by disabling the MIC2846A to reset the mode
back to default.
Figure 8. Mode Change to Count Up
To change the mode back to Count Down Mode, pull the
DC pin low for a period equal to t MODE_DOWN (420μs to
500μs), shown in Figure 9. Now the internal circuitry will
remain in Count Down Mode until changed to Count Up
as described previously.
MIC2846A
Figure10. Brightness Programming Pulses
Multiple brightness levels can be set as shown in Figure
11. When issuing multiple brightness level adjustments
to the DC pin, ensure both t PROG_LOW and t PROG_HIGH are
within 2μs to 32μs.
To maintain operation at the current brightness level
simply maintain a logic level high at the DC pin.
Figure 9. Mode Change to Count Down
Programming the Brightness Level
MIC2846A is designed to start driving the LEDs 140μs
(t START_UP ) after the DC pin is first pulled high at the
maximum brightness level of 48. After start up, the
internal control logic is ready to decrease the LED
brightness upon receiving programming pulses (negative
edges applied to DC pin). Since MIC2846A starts in
Count Down Mode, the brightness level can be
decreased without a mode change by applying two
programming pulses, as shown in Figure10. Note that
the extra pulse is needed to decrease brightness
because the first edge is ignored. Anytime the first falling
edge occurs later than 32μs after a Mode Change, it will
be ignored. Ignoring the first falling edge is necessary in
order that Mode Change (t MODE_UP , t MODE_DOWN ) pulses do
not result in adjustments to the brightness level. Each
programming pulse has a high (t PROG_HIGH ) and a low
(t PROG_LOW ) pulse width that must be between 2μs to
32μs. The MIC2846A will remember the brightness level
Figure11. Decreasing Brightness Several Levels
As mentioned, MIC2846A can be programmed to set
LED drive current to produce one of 49 distinct
brightness levels. The internal logic keeps track of the
brightness level with an Up/Down counter circuit. The
following section explains how the brightness counter
functions with continued programming edges.
Counter Roll-Over
The MIC2846A internal up/down counter contains
registers from 0 to 48 (49 levels). When the brightness
level is at 0 and a programming pulse forces the
brightness to step down, then the counter will roll-over to
level 48. This is illustrated in Figure 12.
and mode it was changed to. For proper operation,
ensure that the DC pin remains high for at least t DELAY
(140μs) before issuing a mode change command.
Figure 12. Down Counter Roll-Over
April 2010
14
M9999-041210-D
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