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参数资料
| 型号： | PCA9534APWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8 I/O, PIA-GENERAL PURPOSE, PDSO16 |
| 封装： | GREEN, PLASTIC, TSSOP-16 |
| 文件页数： | 16/41页 |
| 文件大小： | 985K |
| 代理商： | PCA9534APWR |
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LED
LEDx
VCC
100 kW
VCC
LED
3.3 V
5 V
LEDx
VCC
VCC
Ramp-Up
Re-Ramp-Up
Time to Re-Ramp
Time
Ramp-Down
VCC_RT
VCC_FT
VCC_TRR_GND
www.ti.com
SCPS141F – SEPTEMBER 2006 – REVISED JUNE 2010
Minimizing ICC When the I/O Controls LEDs
When the I/Os are used to control LEDs, they normally are connected to VCC through a resistor as shown in
Figure 14. Because the LED acts as a diode, when the LED is off, the I/O VIN is about 1.2 V less than VCC. The
supply current, ICC, increases as VIN becomes lower than VCC and is specified as ΔICC in Electrical
Characteristics.
For battery-powered applications, it is essential that the voltage of the I/O pins is greater than or equal to VCC
when the LED is off to minimize current consumption. Figure 15 shows a high-value resistor in parallel with the
LED. Figure 16 shows VCC less than the LED supply voltage by at least 1.2 V. Both of these methods maintain
the I/O VIN at or above VCC and prevents additional supply-current consumption when the LED is off.
Figure 15. High-Value Resistor in Parallel With the LED
Figure 16. Device Supplied by a Lower Voltage
Power-On Reset Requirements
In the event of a glitch or data corruption, PCA9534A can be reset to its default conditions by using the power-on
reset feature. Power-on reset requires that the device go through a power cycle to be completely reset. This
reset also happens when the device is powered on for the first time in an application.
The two types of power-on reset are shown in Figure 17 and Figure 18.
Figure 17. VCC is Lowered Below 0.2 V or 0 V and Then Ramped Up to VCC
Copyright 2006–2010, Texas Instruments Incorporated
23
Product Folder Link(s): PCA9534A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PCA9534APWR | 制造商:Texas Instruments 功能描述:I2CLogicInterfaceDeviceICs |
| PCA9534APWRG4 | 功能描述:接口-I/O扩展器 Remote 8B I2C & Lo- Pwr I/O Expander RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
| PCA9534ARGTR | 功能描述:接口-I/O扩展器 Remote 8B I2C and Lo-Pwr I/O Expander RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
| PCA9534ARGTRG4 | 功能描述:接口-I/O扩展器 Remote 8B I2C and Lo-Pwr I/O Expander RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
| PCA9534ARGVR | 功能描述:接口-I/O扩展器 Remote 8B I2C & Lo- Pwr I/O Expander RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
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