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参数资料
| 型号： | MAX6946ATE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER LINEAR 16-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 拓扑： | 开路漏极，PWM |
| 输出数： | 10 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 400kHz |
| 电源电压： | 2.25 V ~ 3.6 V |
| 输出电压： | 7V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN（3x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
10-Port, Constant-Current LED Driver and
I/O Expander with PWM Intensity Control
Table 9. Ramp-Up Register Format (0x12)
DESCRIPTION
D7
D6
D5
REGISTER BIT
D4 D3
D2
D1
D0
Instant full current coming out from shutdown
1/16s ramp-up to full current coming out from shutdown
1/8s ramp-up to full current coming out from shutdown
1/4s ramp-up to full current coming out from shutdown
1/2s ramp-up to full current coming out from shutdown
1s ramp-up to full current coming out from shutdown
2s ramp-up to full current coming out from shutdown
4s ramp-up to full current coming out from shutdown
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Ramp-up and ramp-down use the PWM clock for tim-
ing. When using the external oscillator make sure the
oscillator runs until the end of the sequence. The inter-
CURRENT GLOBAL CURRENT = 0x07
20mA
nal oscillator always runs during a fade sequence, even
if none of the ports use PWM.
The ramp-up and ramp-down circuit operates a 3-bit
DAC. The DAC adjusts the internal current reference
used to set the constant-current outputs in a similar
manner to the global-current register (Table 5). The
MAX6946/MAX6947 scale the master current reference
so all output constant-current and PWM settings adjust
at the same ratio with respect to each other. This
means the LEDs always fade at the same rate even if
with different intensity settings.
The maximum port output current set by the global-cur-
rent register (Table 5) also sets the point during ramp-
down that the current starts falling, and the point during
ramp-up that the current stops rising. Figure 7 shows
the ramp waveforms that occur with different global-
17.5mA
15mA
12.5mA
10mA
7.5mA
5mA
2.5mA
0mA
GLOBAL CURRENT = 0x06
GLOBAL CURRENT = 0x05
GLOBAL CURRENT = 0x04
GLOBAL CURRENT = 0x03
GLOBAL CURRENT = 0x02
GLOBAL CURRENT = 0x01
GLOBAL CURRENT = 0x00
FULL 7/8 6/8 5/8 4/8 3/8 2/8 1/8 ZERO
CURRENT CURRENT CURRENT CURRENT CURRENT CURRENT CURRENT CURRENT CURRENT
current register settings.
Reset Run Option
RAMP-UP
RAMP-DOWN
The MAX6946/MAX6947 feature a Reset Run option so
that simply taking the RST input high brings the driver
out of shutdown in addition to its normal function of
enabling the MAX6946/MAX6947s’ I 2 C interface. This
provides an alternative method of bringing the driver
out of shutdown to writing to the configuration register
through the serial interface. The Reset Run timing uses
the PWM clock, either the internal nominal 32kHz oscil-
lator or a user-provided clock fed into the OSC input
(MAX6946 only).
After enabling the Reset Run option, the MAX6946/
MAX6947 use the rising edge on RST , followed by no
I 2 C interface activity to the MAX6946/MAX6947 for 128
to 129 periods of the PWM clock to trigger the Reset
Figure 7. Global Current Modifies Fade Behavior
Run option. If this timeout period elapses without the
MAX6946/MAX6947 acknowledging an I 2 C transaction,
the run bit (D0) in the configuration register sets, bring-
ing the driver out of shutdown and activating any pro-
grammed ramp-up. If RST pulses high for less than this
timeout period to trigger a Reset Run, the MAX6946/
MAX6947 ignore the pulse, and the MAX6946/MAX6947
continue to wait for a suitable trigger.
Cancel the Reset Run trigger by transmitting an I 2 C
communication to the MAX6946/MAX6947 before the
timeout period elapses. The trigger cancels when the
MAX6946/MAX6947 acknowledge the I 2 C transaction
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6946CAWE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6946CAWE+T | 功能描述:LED照明驱动器 10-Port Constant Current LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX6946EVCMAXQU+ | 功能描述:LED 照明开发工具 MAX6946 Evaluation Kit/Evaluation System RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX6946EVKIT | 功能描述:LED 照明开发工具 10-Port Constant-Current LED Driver and I/O Expander with PWM Intensity Control RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX6946EVKIT+ | 功能描述:LED 照明开发工具 MAX6946 Evaluation Kit/Evaluation System RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
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