收藏本站
AS3685C
Datasheet
Table 7 – Current and Mode Setting for the AS3685
Register
Data3<3>
Data3<7:4>
Purpose
Avoid 1:2 Mode
Flash Timeout Timer
Comments
0 … Charge Pump can use 1:2 Mode
1 … Charge Pump does not use 1:2 Mode; ignored if
Data3<2:0> is set to 111 (forced 1:2 mode)
0000 … Disable Timeout timer for Flash Mode
0001 … 100ms Timeout timer for Flash Mode
0010 … 200ms Timeout timer for Flash Mode
…
1111 … 1500ms Timeout timer for Flash Mode
7.2.1 AS3685 TXMask Function
If the battery has to supply two high currents at the same time (e.g. the AS3685 flash and a RF-power amplifier) it
is possible, that the total current causes a high voltage drop on the battery resulting in a shutdown of the
complete system. In order to avoid this shutdown, the AS3685 (AS3685A or AS3685B) can reduce its current
with the signal ‘TXMask’ using the following circuit:
Figure 15 – TXMask function of the AS3685
The TXMask signal is connected to e.g. the (RF-) power amplifier enable pin (active high if the PA is enabled).
This reduces the flash current if the power amplifier is enabled and avoids the unexpected shutdown of the
system.
Note : The internal flash timeout timer (t FLASHTIMEOUT ) to limit the total flash duration, is not affected by the
TXMask function (see also section ‘Flash Timeout’).
The I ISET current (current into the pin ISET) for TXMask = 0 can be calculated with:
I ISET , TXMask
0
V ISET
R ISET
V ISET
R TXMASK
1.3 V
R ISET
1.3 V
R TXMASK
For TXMask = 1 the current I ISET is reduced to:
I ISET , TXMask
1
V ISET
R ISET
V ISET V TXMask
R TXMASK
1.3 V
R ISET
1.3 V V TXMask
R TXMASK
V(TXMask) is the actual voltage for the high level (‘1’) for the signal TXMask
The maximum flash current I LEDMAX for TXMask=0 or 1 can be calculated according to the following formula
using the above obtained I ISET values:
I LEDMAX I FLASH2BIAS I ISET 7650 I ISET
Choose the values for R ISET and R TXMASK according to your application requirements.
www.austriamicrosystems.com/AS3685
(ptr)
1.1
12 - 21
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
AS3691B-ZMFT IC LED DVR 400MA RGB/WHT 64-MLF
AS3691B-ZTSP IC LED DVR 400MA RGB/WH 20ETSSOP
AS3693A-ZQFT IC LED DVR 16CH W/PWM 48-QFN
AS3693B-ZTQT IC LED CTLR 16-CH W/PWM 64-TQFP
AS3693B-ZTQW IC LED CTLR 16-CH W/PWM 64EPTQFP
AS5040 PB BOARD PROGRAM AS5040
AS5043 PB BOARD PROGRAM AS5043
AS5045 PB BOARD PROGRAM AS5045
相关代理商/技术参数
AS3688 功能描述:IC LIGHTING MGMT FLEXIBLE 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT
AS3688-T 功能描述:IC LIGHTING MGMT FLEXIBLE 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C
AS3689 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:Flexible Lighting Management (Charge Pump, DCDC Step Up, CurrentSink, ADC, LDO)
AS3689-T 功能描述:IC LMU LIGHTING 36-WLCSP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C
AS368R0FLF 制造商:TT Electronics / IRC 功能描述:AS368R0FLF
AS368R0HLF 制造商:TT Electronics / IRC 功能描述:AS368R0HLF
AS368R0JLF 制造商:TT Electronics / IRC 功能描述:AS368R0JLF
AS368R1FLF 制造商:TT Electronics / IRC 功能描述:AS368R1FLF