TI TCA4307：I2C热插拔缓冲器，支持自动总线恢复

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TI-TCA4307是一款专为I2C通信设计的高性能缓冲器，它在现代电子系统中扮演着关键角色，特别是在服务器、企业交换、电信交换设备、基站以及工业自动化设备等需要可靠I2C通信的场景中。这款设备的主要特点如下： 1. 双向数据传输支持：TCA4307能够实现I2C总线信号的双向数据传输，确保了高效的数据交换。 2. 宽广的工作电压范围：从2.3V到5.5V的电源电压支持，使其能在各种供电条件下稳定工作。 3. 温度兼容性：在-40°C至125°C的极端环境中仍能保持良好的性能，体现了其出色的环境适应性。 4. 阻塞总线恢复功能：遇到SDAOUT或SCLOUT持续低电平超过40ms的情况，TCA4307能自动断开总线并尝试恢复，保护了系统免受故障影响。 5. 预充电机制：在插入过程中，SDA和SCL线路预充电至1V，降低了寄生电容对设备的影响，确保了信号的稳定。 6. 兼容多种模式：无论是标准模式还是快速模式的I2C器件，TCA4307都能有效支持，提升了灵活性。 7. 同步与仲裁：通过支持时钟展宽、仲裁功能，TCA4307确保了多设备之间的同步和正确通信。 8. 低功耗设计：在I2C总线空闲时，可以通过EN引脚进入低电平关断模式，显著减少能耗。 9. 连接指示：带有开漏 READY 引脚，当背板与板卡连接时，此引脚会发出高电平信号，便于外部监控设备判断通信状态。 10. 封装规格：TCA4307采用VSSOP-8封装，尺寸小巧，适合于空间受限的应用场合。在实际应用中，TCA4307通过其独特的控制电路，使得I2C设备可以在插入带电背板时实现热插拔，避免了因数据传输错误或电源冲击导致的损坏。同时，其断电高阻抗I2C引脚设计进一步增强了系统的安全性。简化的原理图和数据表提供了清晰的安装指导和电气参数，确保了用户能够轻松集成这款产品到他们的设计中。 TI-TCA4307作为一款功能强大的I2C缓冲器，为工业级设备的可靠通信提供了坚实的基础，是构建高性能、可扩展和灵活I2C系统不可或缺的组件。

6.5 Electrical Characteristics

Over operating free-air temperature range (unless otherwise noted). Typical specifications are at T

= 25 °C, V

= 3.3 V,

unless otherwise noted.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

POWER SUPPLY

Supply current

VCC = 5.5V

SDAIN, SCLIN = 0V

SDAOUT, SCLOUT = 10k R

2.5 4.5 mA

Supply current in shutdown mode through

the V

(1)

EN = 0 V

SDAIN, SCLIN, SDAOUT, SCLOUT = 0V

or V

READY pin = Hi-Z

EN pulled low after bus connection event

(disable precharge)

10 30 µA

UVLO

Under voltage lockout (rising)

EN = V

READY = 10 kΩ to V

2.1 V

Under voltage lockout (falling) 2 V

START-UP CIRCUITRY

PRE

Pre-charge voltage SDA, SCL = Hi-Z 0.8 1 1.2 V

RISE-TIME ACCELERATORS

RTA pull-up current

(2)

Position transition on SDA, SCL

SDA/SCL

= 0.6 V, Slew rate = 1.25 V/µs.

VCC = 3.3 V

2 5 mA

INPUT-OUTPUT CONNECTION

Input pin leakage

SDA/SCL pins = 90% V

, EN = V

GND

SDA/SCL pins = 10% V

, EN = GND

-1 1 µA

Input-output offset voltage (SCLIN to

SCLOUT, SCLOUT to SCLIN and SDAIN

to SDAOUT, SDAOUT to SDAIN

for SDA/SCL = 10 kΩ

60 100 mV

I_RDY

Ready pin leakage

EN = VCC, READY = V

, Bus

connected

-1 1 µA

DIGITAL IO THRESHOLD

High-level input voltage EN

0.7 ×

Low-level input voltage EN 0

0.3 ×

Low-level output voltage

SDAIN, SCLIN, SDAOUT, SCLOUT

= 4 mA

= 0.1 V

0.15 0.4

READY

= 3 mA

0 0.4

DYNAMIC CHARACTERISTICS

IN (EN)

EN input capacitance

= 0 V or V

f = 400 kHz

1.6 4

(READY)

READY output capacitance

READY

= 0 V or V

f = 400 kHz

7 10

IO (SDA/

SCL)

SDA/SCL pin capacitance

= 0 V or V

f = 400 kHz

5 10

STUCK BUS RECOVERY

STUCKBU

Stuck bus timer 25 40 65 ms

SB_SCLO

Stuck bus recovery clock frequency 5.5 8.5 14 kHz

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TCA4307

ZHCSLQ0 – AUGUST 2020

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Product Folder Links: TCA4307

6.5 Electrical Characteristics (continued)

Over operating free-air temperature range (unless otherwise noted). Typical specifications are at T

= 25 °C, V

= 3.3 V,

unless otherwise noted.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Low level output during stuck bus clock

output

= 4 mA 0 0.4 V

(1) In shutdown mode there will also be current flowing from V

through the ready pin as this pin is pulled down to indicate the bus is

disconnected.

(2) Determined by design, not tested in production.

6.6 Timing Requirements

MIN NOM MAX UNIT

SCL_MAX

Maximum SCL clock frequency 400 kHz

BUF

(1)

Bus free time between a STOP and START condition 1.3 µs

HD;STA

(1)

Hold time for a repeated START condition 0.6 µs

SU;STA

(1)

Set-up time for a repeated START condition 0.6 µs

SU;STO

(1)

Set-up time for a STOP condition 0.6 µs

HD;DAT

(1)

Data hold time 0 ns

SU;DAT

(1)

Data set-up time 100 ns

LOW

(1)

LOW period of the SCL clock 1.3 µs

HIGH

(1)

HIGH period of the SCL clock 0.6 µs

(1)

Fall time of both SDA and SCL signals

20 ×

/5.5

300 ns

(1)

Rise time of both SDA and SCL signals

20 ×

/5.5

300 ns

(1) These are system-level timing specs and are dependent upon bus capacitance and pull up resistor value. It is up to the system

designer to ensure they are met

6.7 Switching Characteristics

Over operating free-air temperature range (unless otherwise noted). Typical specifications are at T

= 25 °C, V

= 3.3 V,

unless otherwise noted.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

START-UP CIRCUITRY

PRECHAR

Time from V

to precharge enabled

SDA,SCL = Hi-Z

EN = V

, GND

15 60 µs

Time from V

POR

to digital being ready

VCC transition from 0V to V

Time from V

PORR

to earliest stop bit

recongized

35 95 µs

IDLE

Bus idle time to READY active

SDA,SCL = 10 kΩ to V

EN = V

Measured at 0.5 × V

95 150 µs

DISABLE

Time from EN high to low to READY low

SDA,SCL = 10 kΩ to V

READY = 10 kΩ to V

Measured at 0.5 × V

30 200 ns

STOP

SDAIN to READY delay after stop

condition

SDA,SCL = 10 kΩ to V

READY = 10 kΩ to V

Measured at 0.5 × V

1.2 2 µs

READY

SCLOUT/SDAOUT to READY

SDA,SCL = 10 kΩ to V

READY = 10 kΩ to V

Measured at 0.5 × V

0.8 1.5 µs

INPUT-OUTPUT CONNECTION

TCA4307

ZHCSLQ0 – AUGUST 2020

www.ti.com.cn

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