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| 型号： | PCA9506DGG,512 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 5/34页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C 40B 56TSSOP |
| 产品培训模块： | I²C Bus Fundamentals |
| 特色产品： | NXP - I2C Interface |
| 标准包装： | 35 |
| 接口： | I²C |
| 输入/输出数： | 40 |
| 中断输出： | 是 |
| 频率 - 时钟： | 400kHz |
| 电源电压： | 2.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 56-TFSOP（0.240"，6.10mm 宽） |
| 供应商设备封装： | 56-TSSOP |
| 包装： | 管件 |
| 包括： | POR |
| 产品目录页面： | 824 (CN2011-ZH PDF) |
| 其它名称： | 568-3354-5 935280798512 PCA9506DGG |
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PCA9505_9506
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 4 — 3 August 2010
13 of 34
NXP Semiconductors
PCA9505/06
40-bit I2C-bus I/O port with RESET, OE and INT
7.6 Interrupt output (INT)
The open-drain active LOW interrupt is activated when one of the port pins changes state
and the port pin is configured as an input and the interrupt on it is not masked. The
interrupt is deactivated when the port pin input returns to its previous state or the Input
Port register is read.
Remark: Changing an I/O from an output to an input may cause a false interrupt to occur
if the state of the pin does not match the contents of the Input Port register.
Only a read of the Input Port register that contains the bit(s) image of the input(s) that
generated the interrupt clears the interrupt condition.
If more than one input register changed state before a read of the Input Port register is
initiated, the interrupt is cleared when all the input registers containing all the inputs that
changed are read.
Example: If IO0_5, IO2_3, and IO3_7 change state at the same time, the interrupt is
cleared only when INREG0, INREG2, and INREG3 are read.
7.7 Output enable input (OE)
The active LOW output enable pin allows to enable or disable all the I/Os at the same
time. When a LOW level is applied to the OE pin, all the I/Os configured as outputs are
enabled and the logic value programmed in their respective OP registers is applied to the
pins. When a HIGH level is applied to the OE pin, all the I/Os configured as outputs are
3-stated.
For applications requiring LED blinking with brightness control, this pin can be used to
control the brightness by applying a high frequency PWM signal on the OE pin. LEDs can
be blinked using the Output Port registers and can be dimmed using the PWM signal on
the OE pin thus controlling the brightness by adjusting the duty cycle.
7.8 Live insertion
The PCA9505/06 are fully specified for live insertion applications using IOFF, power-up
3-states, robust state machine, and 50 ns noise filter. The IOFF circuitry disables the
outputs, preventing damaging current backflow through the device when it is powered
down. The power-up 3-state’s circuitry places the outputs in the high-impedance state
during power-up and power-down, which prevents driver conflict and bus contention.
The robust state machine does not respond until it sees a valid START condition and the
50 ns noise filter will filter out any insertion glitches. The PCA9505/06 will not cause
corruption of active data on the bus, nor will the device be damaged or cause damage to
devices already on the bus when similar featured devices are being used.
7.9 Standby
The PCA9505/06 goes into standby when the I2C-bus is idle. Standby supply current is
lower than 1
μA (typical).
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