PCA9306D

更新时间： 2024-02-06 15:27:15

品牌	Logo	应用领域
恩智浦 - NXP		转换器电平转换器
页数	文件大小	规格书
21页	124K
描述
Dual bidirectional I2C-bus and SMBus voltage-level translator

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替代型号

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PCA9306D 数据手册

PCA9306

Dual bidirectional I²C-bus and SMBus voltage-level translator

Rev. 02 — 21 February 2007

Product data sheet

1. General description

The PCA9306 is a dual bidirectional I²C-bus and SMBus voltage-level translator with an

enable (EN) input, and is operational from 1.1 V to 3.6 V (V_ref(1)) and 2.3 V to 5.5 V

(V_bias(ref)(2)).

The PCA9306 allows bidirectional voltage translations between 1.2 V and 5 V without the

use of a direction pin. The low ON-state resistance (R_on) of the switch allows connections

to be made with minimal propagation delay. When EN is HIGH, the translator switch is on,

and the SCL1 and SDA1 I/O are connected to the SCL2 and SDA2 I/O, respectively,

allowing bidirectional data ﬂow between ports. When EN is LOW, the translator switch is

off, and a high-impedance state exists between ports.

In I²C-bus applications, the bus capacitance limit of 400 pF restricts the number of devices

and bus length. Using the PCA9306 enables the system designer to isolate two halves of

a bus, thus more I²C-bus devices or longer trace length can be accommodated by using

the enable pin. The PCA9306 is not a bus buffer like the PCA9509 or PCA9517 that

provides level translation and physically isolates the capacitance to either side of the bus

even when both sides are connected.

The PCA9306 can also be used to run two buses, one at 400 kHz operating frequency

and the other at 100 kHz operating frequency. If the two buses are operating at different

frequencies, the 100 kHz bus must be isolated when the 400 kHz operation of the other

bus is required. If the master is running at 400 kHz, the maximum system operating

frequency may be less than 400 kHz because of the delays added by the translator.

As with the standard I²C-bus system, pull-up resistors are required to provide the logic

HIGH levels on the translator’s bus. The PCA9306 has a standard open-collector

conﬁguration of the I²C-bus. The size of these pull-up resistors depends on the system,

but each side of the translator must have a pull-up resistor. The device is designed to work

with Standard-mode, Fast-mode and Fast mode Plus I²C-bus devices in addition to

SMBus devices.

When the SDA1 or SDA2 port is LOW, the clamp is in the ON-state and a low resistance

connection exists between the SDA1 and SDA2 ports. Assuming the higher voltage is on

the SDA2 port when the SDA2 port is HIGH, the voltage on the SDA1 port is limited to the

voltage set by VREF1. When the SDA1 port is HIGH, the SDA2 port is pulled to the drain

pull-up supply voltage (V_pu(D)) by the pull-up resistors. This functionality allows a seamless

translation between higher and lower voltages selected by the user without the need for

directional control. The SCL1/SCL2 channel also functions as the SDA1/SDA2 channel.

12 3 4 5 6 7...21

中文翻译

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PCA9306D 替代型号

型号	品牌	替代类型	描述	数据表
PCA9306D,112	NXP	功能相似	PCA9306 - Dual bidirectional I2C-bus and SMBus voltage-level translator SOIC 8-Pin
PCA9306D,118	NXP	功能相似	PCA9306 - Dual bidirectional I2C-bus and SMBus voltage-level translator SOIC 8-Pin

与PCA9306D相关器件

型号	品牌	获取价格	描述	数据表
PCA9306D,112	NXP	获取价格	PCA9306 - Dual bidirectional I2C-bus and SMBus voltage-level translator SOIC 8-Pin
PCA9306D,118	NXP	获取价格	PCA9306 - Dual bidirectional I2C-bus and SMBus voltage-level translator SOIC 8-Pin
PCA9306DC	NXP	获取价格	Dual bidirectional I2C-bus and SMBus voltage-level translator
PCA9306DC,125	NXP	获取价格	PCA9306 - Dual bidirectional I2C-bus and SMBus voltage-level translator SSOP 8-Pin
PCA9306DC1	NXP	获取价格	Dual bidirectional I2C-bus and SMBus voltage-level translator
PCA9306DC1/DG,125	NXP	获取价格	PCA9306 - Dual bidirectional I2C-bus and SMBus voltage-level translator SSOP 8-Pin
PCA9306DC1-G	NXP	获取价格	IC SPECIALTY INTERFACE CIRCUIT, PDSO8, 2.30 MM, GREEN, PLASTIC, MO-187, SOT765-1, VSSOP-8,
PCA9306DC-G	NXP	获取价格	IC SPECIALTY INTERFACE CIRCUIT, PDSO8, 2.30 MM, GREEN, PLASTIC, MO-187, SOT765-1, VSSOP-8,
PCA9306DCTR	TI	获取价格	DUAL BIDIRECTIONAL I2C BUS AND SMBus VOLTAGE-LEVEL TRANSLATOR
PCA9306DCTRE4	TI	获取价格	DUAL BIDIRECTIONAL I2C BUS AND SMBus VOLTAGE-LEVEL TRANSLATOR

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