TCA9555 具有中断输出和配置寄存器的远程 16 位 I2C 和 SMBus I/O 扩展器
This 16-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 1.65-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)].
The TCA9555 consists of two 8-bit Configuration (input or output selection), Input Port, Output Port, and Polarity Inversion (active high or active low operation) registers. At power on, the I/Os are configured as inputs. The system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or output is kept in the corresponding Input or Output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. All registers can be read by the system master.
The system master can reset the TCA9555 in the event of a timeout or other improper operation by utilizing the power-on reset feature, which puts the registers in their default state and initializes the I2C/SMBus state machine.
The TCA9555 open-drain interrupt (INT) output is activated when any input state differs from its corresponding Input Port register state and is used to indicate to the system master that an input state has changed.
INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I2C bus. Thus, the TCA9555 can remain a simple slave device.
The device outputs (latched) have high-current drive capability for directly driving LEDs.
Although pin-to-pin and I2C-address is compatible with the PCF8575, software changes are required due to the enhancements.
The TCA9555 is identical to the TCA9535, except for the inclusion of the internal I/O pullup resistor, which pulls the I/O to a default high when configured as an input and undriven.
Three hardware pins (A0, A1, and A2) are used to program and vary the fixed I2C address and allow up to eight devices to share the same I2C bus or SMBus. The fixed I2C address of the TCA9555 is the same as the PCF8575, PCF8575C, and PCF8574, allowing up to eight of these devices in any combination to share the same I2C bus or SMBus
| TCA9555 | |
| Interrupt Output | Yes |
| Pin/Package | 24QFN, 24TSSOP |
| Operating Temperature Range(°C) | -40 to 85 |
| Max Frequency(kHz) | 400 |
| I2C Address | 0100 xxx |
| # of I/Os | 16 |
| Vcc range(V) | 1.65 to 5.5 |
| Configuration Registers | Yes |
| 5V Tolerant I/O | Yes |
| Push–Pull I/O Type | Yes |
TCA9555 特性
- Low Standby-Current Consumption of 3 uA Max
- I2C to Parallel Port Expander
- Open-Drain Active-Low Interrupt Output
- 5-V Tolerant I/O Ports
- Compatible With Most Microcontrollers
- 400-kHz Fast I2C Bus
- Address by Three Hardware Address Pins for Use of up to Eight Devices
- Polarity Inversion Register
- Latched Outputs With High-Current Drive Capability for Directly Driving LEDs
- Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
- ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 200-V Machine Model (A115-A)
- 1000-V Charged-Device Model (C101)
TCA9555 芯片订购指南
| 器件 | 状态 | 温度 | 价格 | 封装 | 引脚 | 封装数量 | 封装载体 | 丝印标记 |
| TCA9555PWR | ACTIVE | -40 to 85 | 1.20 | 1ku | TSSOP (PW) | 24 | 2000 | LARGE T&R | |
| TCA9555RTWR | ACTIVE | -40 to 85 | 1.20 | 1ku | QFN (RTW) | 24 | 3000 | LARGE T&R |
TCA9555 质量与无铅数据
| 器件 | 环保计划* | 铅/焊球涂层 | MSL 等级/回流焊峰 | 环保信息与无铅 (Pb-free) | DPPM / MTBF / FIT 率 |
| TCA9555PWR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | TCA9555PWR | TCA9555PWR |
| TCA9555RTWR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | TCA9555RTWR | TCA9555RTWR |
TCA9555 应用技术支持与电子电路设计开发资源下载
- TCA9555 数据资料 dataSheet 下载.PDF
- TI 德州仪器I2C 逻辑器件产品选型与价格 . xls
- Logic Guide 2009 (PDF 4263 KB)
- Shelf-Life Evaluation of Lead-Free Component Finishes (PDF 1305 KB)
- Understanding and Interpreting Standard-Logic Data Sheets (PDF 857 KB)
- TI IBIS File Creation, Validation, and Distribution Processes (PDF 380 KB)
- Implications of Slow or Floating CMOS Inputs (PDF 101 KB)
- CMOS Power Consumption and CPD Calculation (PDF 89 KB)
- Designing With Logic (PDF 186 KB)
- Live Insertion (PDF 150 KB)
- Input and Output Characteristics of Digital Integrated Circuits (PDF 1708 KB)
- Using High Speed CMOS and Advanced CMOS in Systems With Multiple Vcc (PDF 43 KB)
- HiRel Unitrode Power Management Brochure (PDF 206 KB)
- LOGIC Pocket Data Book (PDF 6001 KB)
- HiRel Unitrode Power Management Brochure (PDF 206 KB)
- Logic Cross-Reference (PDF 2938 KB)