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参数资料
| 型号： | LTC3205EUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WT/RGB BCKLGT 24-QFN |
| 标准包装： | 91 |
| 拓扑： | PWM，降压（降压），升压（升压），切换式电容器（充电泵） |
| 输出数： | 9 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 600kHz ~ 1.1MHz |
| 电源电压： | 2.8 V ~ 4.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
LTC3205
OPERATIO
Unused MAIN or SUB Display LED Pins
Table 3. RGB Duty Cycles
Any of the six white LED pins (MAIN1-MAIN4, SUB1 and
SUB2) can cause the LTC3205 to switch from 1:1 mode to
2:3 charge pump mode if they drop out. If an unused LED
pin is left unconnected or grounded, it will automatically
drop out and force the LTC3205 into charge pump mode.
To avoid this problem, unused LED pins on the MAIN and
SUB displays should be connected to CPO. However, power
is not wasted in this configuration. When the LED pin voltage
is within approximately 1V of CPO, its LED current is
switched off and only a small 10 μ A test current remains.
Figure 4 shows a block diagram of each of the MAIN and
SUB LED pins. The RED, GREEN and BLUE pins do not affect
the state of the charge pump so they can be left floating or
grounded if unused.
CPO
~1V
D11
D7
D3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
D10
D6
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
D9
D5
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
D8
D4
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
HEX
CODE
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
DUTY
CYCLE (%)
0/15
1/15
2/15
3/15
4/15
5/15
6/15
7/15
8/15
9/15
10/15
11/15
12/15
13/15
14/15
+
– +
MAIN1-MAIN4
1
1
1
1
F
15/15
SUB1, SUB2
10 μ A
I RED , GREENBLUE = 400
R RGB
–
ENABLE
I LED
3205 F04
Figure 4. Internal MAIN and SUB Panel LED Disable Circuit
RGB Illuminator Drivers
The red, green and blue LEDs can be individually set to
have a duty cycle ranging from 0/15 (off) to 15/15 (full on)
with 1/15 increments in between. The combination of 16
possible brightness levels gives the RGB indicator LED a
APPLICATIO S I FOR ATIO
Interfacing to a Microcontroller
The serial port of the LTC3205 can be connected directly
total of 4096 colors. Table 3 indicates the decoding of the
red, green and blue LEDs.
The full-scale currents in the red, green and blue LEDs are
controlled by the current at the I RGB pin in a similar manner
to those in the main and sub panels. The I RGB pin is
regulated at 1.223V and the LED current is a precise
multiple of the I RGB current.
The RGB display LED currents will follow the relationship:
1.223 V
,
where R RGB is the value of the resistor on the I RGB pin.
to an MC68HC11 style microcontroller’s serial port. The
microcontroller should be configured as the master device
and its clock’s idle state should be set to high (MSTR = 1,
CPOL = 1 and CPHA = 1 for the MC68HC11 family).
μ CONTROLLER
MOSI
SCK
GPIO
LTC3205
D IN
SCLK
LD
Figure 5 shows the recommended configuration and
directon of data flow. Note that an additional I/O line is
3205 F05
Figure 5. Microcontroller Interface
3205f
9
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相关代理商/技术参数 |
参数描述 |
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| LTC3205XEUF#PBF | 功能描述:IC LED DRVR WT/RGB BCKLGT 24-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 |
| LTC3205XEUF#TRPBF | 功能描述:IC LED DRVR WT/RGB BCKLGT 24-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 |
| LTC3206 | 制造商:LINER 制造商全称:Linear Technology 功能描述:I2C Multidisplay LED Controller |
| LTC3206EUF | 功能描述:IC LED DRVR WT/RGB BCKLGT 24-QFN RoHS:否 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 |
| LTC3206EUF#PBF | 功能描述:IC LED DRVR WT/RGB BCKLGT 24-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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