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| 型号： | PCA9635PW/S911,118 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 24/35页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER RGBA 28-TSSOP |
| 标准包装： | 2,500 |
| 拓扑： | 开路漏极，PWM |
| 输出数： | 16 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，LED 闪烁器 |
| 类型 - 次要： | RGBA |
| 频率： | 100kHz ~ 1MHz |
| 电源电压： | 2.3 V ~ 5.5 V |
| 输出电压： | 5.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | 935285521118 PCA9635PW/S911-T PCA9635PW/S911-T-ND |
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NXP Semiconductors
PCA9635
16-bit Fm+ I 2 C-bus LED driver
Question 1: What kind of edge rate control is there on the outputs?
? The typical edge rates depend on the output con?guration, supply voltage, and the
applied load. The outputs can be con?gured as either open-drain NMOS or
totem-pole outputs. If the customer is using the part to directly drive LEDs, they
should be using it in an open-drain NMOS, if they are concerned about the maximum
I SS and ground bounce. The edge rate control was designed primarily to slow down
the turn-on of the output device; it turns off rather quickly (~1.5 ns). In simulation, the
typical turn-on time for the open-drain NMOS was ~14 ns (V DD = 3.6 V; C L = 50 pF;
R PU = 500 ? ).
Question 2: Is ground bounce possible?
? Ground bounce is a possibility, especially if all 16 outputs are changed at full current
(25 mA each). There is a fair amount of decoupling capacitance on chip (~50 pF),
which is intended to suppress some of the ground bounce. The customer will need to
determine if additional decoupling capacitance externally placed as close as
physically possible to the device is required.
Question 3: Can I really sink 400 mA through the single ground pin on the package and
will this cause any ground bounce problem due to the PWM of the LEDs?
? Yes, you can sink 400 mA through a single ground pin on the package . Although the
package only has one ground pin, there are two ground pads on the die itself
connected to this one pin. Although some ground bounce is likely, it will not disrupt the
operation of the part and would be reduced by the external decoupling capacitance.
Question 4: I can’t turn the LEDs on or off, but their registers are set properly. Why?
? Check the Mode Register 1 bit 4 SLEEP setting. The value needs to be 0 so that the
OSC is turn on. If the OSC is turned off, the LEDs cannot be turned on or off and also
can’t be dimmed or blinked.
Question 5: I’m using LEDs with integrated Zener diodes and the IC is getting very hot.
Why?
? The IC outputs can be set to either open-drain or push-pull and default to push-pull
outputs. In this application with the Zener diodes, they need to be set to open-drain
since in the push-pull architecture there is a low resistance path to GND through the
Zener and this is causing the IC to overheat. The PCA9632/33/34/35 ICs all power-up
in the push-pull output mode and with the logic state HIGH, so one of the ?rst things
that need to be done is to set the outputs to open-drain.
PCA9635_7
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 07 — 16 July 2009
24 of 35
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