ADM8845

更新时间： 2024-02-13 21:04:06

品牌	Logo	应用领域
亚德诺 - ADI		驱动器泵
页数	文件大小	规格书
18页	338K
描述
Charge Pump Driver for LCD White LED Backlights

阅读下载

获取价格

技术参数
数据手册

如果您发现信息不准确，欢迎纠错

ADM8845 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	QFN
包装说明：	HVQCCN, LCC16,.12SQ,20	针数：	16
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.32
Is Samacsys：	N	接口集成电路类型：	LED DISPLAY DRIVER
JESD-30 代码：	S-XQCC-N16	JESD-609代码：	e3
长度：	3 mm	湿度敏感等级：	3
复用显示功能：	NO	功能数量：	1
区段数：	6	端子数量：	16
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	UNSPECIFIED	封装代码：	HVQCCN
封装等效代码：	LCC16,.12SQ,20	封装形状：	SQUARE
封装形式：	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	峰值回流温度（摄氏度）：	260
电源：	2.6/5.5 V	认证状态：	Not Qualified
座面最大高度：	1 mm	子类别：	Display Drivers
最大供电电压：	5.5 V	最小供电电压：	2.6 V
标称供电电压：	3.3 V	表面贴装：	YES
技术：	CMOS	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	NO LEAD
端子节距：	0.5 mm	端子位置：	QUAD
处于峰值回流温度下的最长时间：	40	宽度：	3 mm
Base Number Matches：	1

ADM8845 数据手册

ADM8845

Preliminary Technical Data

ADM8845 BRIGHTNESS CONTROL WITH A DIGITAL PWM SIGNAL

PWM brightness control provides the widest brightness control

method by pulsing the white LEDs on and off using the digital

input control pins, CTRL1 and/or CTRL2. PWM brightness

control also removes any chromaticity shifts associated with

changing the white LED current, as the LEDs operate at either

zero current or full current (set by the R_SETresistor).

The ADM8845 main and sub display brightness can be

controlled together or separately. By applying a digital PWM

signal to both CTRL1 and CTRL2 pins. The duty cycle of the

applied digital PWM signal determines the brightness of the

main and sub displays together. By varying the duty cycle of the

applied PWM signal you vary the brightness of the main and

sub displays from 0% to 100%.

The digital PWM signal applied with a frequency of 100Hz to

200kHz turns the current control sinks on and off using CTRL1

and/or CTRL2. The average current through the LEDs changes

with the PWM signal duty cycle. If the PWM frequency is much

less than 100Hz, flicker may be seen in the LEDs. For the

ADM8845, zero duty cycle will turn off the LEDs and a 50%

duty cycle will result in an average LED current I_LEDbeing half

the programmed LED current. For example, if R_SETis set to

program 20mA/LED, a 50% duty cycle will result in an average

I_LEDof 10mA/LED. I_LEDbeing half the programmed LED current.

By holding CTRL1 low and applying a digital PWM signal to

CTRL2, the sub display is turned off and the main display is on,

the brightness of the main display is determined by the duty

cycle off the applied digital PWM signal.

Also applying a digital PWM signal to CTRL1 and holding

CTRL2 low, the sub display is turned on and the main display is

off, the brightness of the sub display is determined by the duty

cycle off the applied digital PWM signal.

Also applying a digital PWM signal to CTRL1 and holding

CTRL2 high, the sub display is turned on and the main display

is turned on, the brightness of the sub display is determined by

the duty cycle off the applied digital PWM signal. The

brightness of the main display is set to the maximum

(maximum is set by the R_SETresistor).

Vo ut

ADM8845

CTRL1

PWM Input

High/Low

By holding CTRL1 high and applying a digital PWM signal to

CTRL2, the sub display is turned on and the main display is on,

the brightness of the main display is determined by the duty

cycle off the applied digital PWM signal. The brightness of the

sub display is set to the maximum (maximum is set by the R_SET

resistor)

PWM Input

High/Low

CTRL2

FB1

FB 2

FB 3

FB4

FB 5

Iset

FB6

Rset

When CTRL1 and CTRL2 go low the LED Current Control

Sinks shutdown. Shutdown of the Charge Pump is delayed by

15mS. This timeout period (t_CP) allows the ADM8845 to

determine if a digital PWM signal is present on CTRL1 and

CTRL2 or if the user has selected a full chip shutdown, see

Figure 25 ADM8845 Application Timing.

Figure 24. ADM8845 Digital PWM Brightness Control Application

Diagram

By applying a digital PWM signal to the digital input control

pins, CTRL1 and/or CTRL2 you can adjust the brightness of the

sub and/or main displays. The ADM8845 six white LEDs are

organized into 2 groups, Main Display (FB1-FB4) and Sub

Display (FB4 - FB6), refer to Page 10.

If digital PWM brightness control of the LEDs is not required

then a constant logic level 1 (V_CC) or 0 (GND) must be applied.

Rev. PrJ 06/04 | Page 12 of 18

1...9 10 111213 14 15...18

下载PDF

与ADM8845相关器件

型号	品牌	描述	获取价格	数据表
ADM8845ACP	ADI	Charge Pump Driver for LCD White LED Backlights	获取价格
ADM8845ACP-REEL	ADI	Charge Pump Driver for LCD White LED Backlights	获取价格
ADM8845ACP-REEL7	ADI	Charge Pump Driver for LCD White LED Backlights	获取价格
ADM8845ACPZ	ADI	Charge Pump Driver for LCD White LED Backlights	获取价格
ADM8845ACPZ-REEL	ADI	Charge Pump Driver for 6 White LED LCD Backlights	获取价格
ADM8845ACPZ-REEL1	ADI	Charge Pump Driver for LCD White LED Backlights	获取价格

与ADM8845相关文章

SG3525资料手册详解：SG3525参数分析、引脚说明、应用介绍
2024-05-23

5
AT89C51单片机资料手册详细解析及应用示例
2024-05-23

8
CP2102资料手册解读：CP2102引脚说明、关键参数分析
2024-05-23

4
资料手册解读：UC3842参数和管脚说明
2024-05-22

6

产品中心

服务支持

精选活动

关于我们

帮助中心

ADM8845

ADM8845 技术参数

ADM8845 数据手册

与ADM8845相关器件

与ADM8845相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

ADM8845

ADM8845 技术参数

ADM8845 数据手册

与ADM8845相关器件

与ADM8845相关文章

您还可以找

您在本页遇到什么问题？