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参数资料
| 型号： | LTC3208EUH#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR QVGA DISPLAY 32-QFN |
| 标准包装： | 2,500 |
| 拓扑： | 升压（升压），切换式电容器（充电泵） |
| 输出数： | 17 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 600kHz ~ 1.2MHz |
| 电源电压： | 2.9 V ~ 4.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LTC3208
OPERATIO
R REF Current Set Resistor
The current set resistor is connected between RREF and
ground. The value of this resistor should typically be near
24k since all of the DAC reference currents and support
circuit currents are related to this set current.
This input is protected against shorts to ground or low
value resistors <10k. When a fault is detected the reference
current ampli?er is current limited. In addition, the current
source outputs and charge pump are disabled.
Mode Switching
The LTC3208 will automatically switch from 1x mode
to 1.5x mode and subsequently to 2x mode whenever
a dropout condition is detected at an LED pin. Dropout
occurs when a current source voltage becomes too low
for the programmed current to be supplied. The dropout
delay is typically 400μs.
The mode will automatically switch back to 1x whenever
a data bit is updated via the I 2 C port or when the CAMHL
pin switches from high to low.
Fullscale LED Current Equations
AUX fullscale LED current ( Amps ) =
1 . 215V
R REF
? 518
I 2 C Interface
The LTC3208 communicates with a host (master) using
the standard I 2 C 2-wire interface. The Timing Diagram
SUB / MAIN fullscale LED current ( Amps ) =
1 . 215V
R RE F
? 543
(Figure 5) shows the timing relationship of the signals on
the bus. The two bus lines, SDA and SCL, must be high
when the bus is not in use. External pull-up resistors or
CAM fullscale LED current ( Amps ) =
1 . 215V
R REF
? 202 5
current sources, such as the LTC1694 SMBus accelerator,
are required on these lines.
The LTC3208 is a receive-only (slave) device.
RGB fullscale LED current ( Amps ) =
ADDRESS
1 . 215V
R REF
WR
? 533
SUB-ADDRESS
DATA BYTE
0
0
1
1
0
1
1
0
S7
S6
S5
S4
S3
S2
S1
S0
7
6
5
4
3
2
1
0
START
STOP
SDA
0
0
1
1
0
1
1
0
ACK
S7
S6
S5
S4
S3
S2
S1
S0 ACK
7
6
5
4
3
2
1
0
ACK
SCL
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
3208 FO4
Figure 4. Bit Assignments
SDA
t SU, DAT
t SU, STA
t BUF
SCL
t HD, STA
t LOW
t HIGH
t HD, DAT
t HD, STA
t SP
t SU, STO
3208 F05
START
CONDITION
t r
t f
REPEATED START
CONDITION
STOP
CONDITION
START
CONDITION
Figure 5. Timing Parameters
3208fa
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3209-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA Main/Camera LED Controller |
| LTC3209-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA Main/Camera LED Controller |
| LTC3209EUF-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA Main/Camera LED Controller |
| LTC3209EUF-1#PBF | 功能描述:IC LED DRIVR QVGA DISPLAY 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LTC3209EUF-1#TRPBF | 功能描述:IC LED DRIVR QVGA DISPLAY 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
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