Datasheet > PCA9509PDP,118

PCA9509PDP,118

更新时间： 2024-01-21 06:43:19

品牌	Logo	应用领域
恩智浦 - NXP		PC 光电二极管接口集成电路
页数	文件大小	规格书
25页	1041K
描述
PCA9509P - Low power level translating I²C-bus/SMBus repeater TSSOP 8-Pin

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PCA9509PDP,118 技术参数

是否Rohs认证：	符合	生命周期：	Active
零件包装代码：	TSSOP	包装说明：	TSSOP,
针数：	8	Reach Compliance Code：	compliant
HTS代码：	8542.39.00.01	风险等级：	1.65
接口集成电路类型：	INTERFACE CIRCUIT	JESD-30 代码：	S-PDSO-G8
长度：	3 mm	湿度敏感等级：	1
功能数量：	1	端子数量：	8
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	TSSOP
封装形状：	SQUARE	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	NOT SPECIFIED	座面最大高度：	1.1 mm
最大供电电压：	1.5 V	最小供电电压：	0.8 V
标称供电电压：	1.1 V	电源电压1-最大：	5.5 V
电源电压1-分钟：	2.3 V	电源电压1-Nom：	3.3 V
表面贴装：	YES	技术：	CMOS
温度等级：	INDUSTRIAL	端子形式：	GULL WING
端子节距：	0.65 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	3 mm
Base Number Matches：	1

PCA9509PDP,118 数据手册

PCA9509P

NXP Semiconductors

Low power level translating I²C-bus/SMBus repeater

6. Functional description

Refer to Figure 1 “Functional diagram of PCA9509P”.

The PCA9509P enables I²C-bus or SMBus translation down to V_CC(A)as low as 0.8 V

without degradation of system performance. The PCA9509P contains 2 bidirectional

open-drain buffers specifically designed to support up-translation/down-translation

between the low voltage and 3.3 V SMBus or 5 V I²C-bus. The port A and port B I/Os are

over-voltage tolerant to 5.5 V even when the device is unpowered.

The PCA9509P includes a power-up circuit that keeps the output drivers turned off until

V_CC(B)is above 1.7 V and the V_CC(A)is above 0.7 V. V_CC(B)and V_CC(A)can be applied in

any sequence at power-up. After power-up and with the EN pin HIGH, a LOW level on

port A (below approximately 0.15V_CC(A)) turns on the corresponding port B driver (either

SDA or SCL) and drives port B down to about 0 V. When port A rises above approximately

0.15V_CC(A), the port B pull-down driver is turned off and the external pull-up resistor pulls

the pin HIGH. When port B falls first and goes below 0.3V_CC(B), the port A driver is turned

on and port A pulls down to 0.2V_CC(A)(typical). The port B pull-down is not enabled unless

the port A voltage goes below V_IL. If the port A low voltage goes below V_IL, the port B

pull-down driver is enabled until port A rises above approximately 0.15V_CC(A)(V_IL), then

port B, if not externally driven LOW, rises, being pulled up by the external pull-up resistor.

When port B voltage rises above 50 % of V_CC(B), port A continues to rise being pulled up

by external pull-up resistor.

Remark: Ground offset between the PCA9509P ground and the ground of devices on

port A of the PCA9509P must be avoided.

The reason for this cautionary remark is that a CMOS/NMOS open-drain capable of

sinking 3 mA of current at 0.4 V has an output resistance of 133  or less (R = E / I). Such

a driver shares enough current with the port A output pull-down of the PCA9509P to be

seen as a LOW as long as the ground offset is zero. If the ground offset is greater than

0 V, then the driver resistance must be less. Since V_ILcan be as low as 80 mV at cold

temperatures and the low end of the current distribution, the maximum ground offset

should not exceed 40 mV.

Bus repeaters that use an output offset are not interoperable with the port A of the

PCA9509P as their output LOW levels are not recognized by the PCA9509P as a LOW. If

the PCA9509P is placed in an application where the V_ILof port A of the PCA9509P does

not go below its V_IL, the port B does not go LOW.

Port B provides normal I²C-bus voltage levels and is interoperable with all I²C-bus slaves,

masters and repeaters.

6.1 Enable

The EN pin is active HIGH and allows the user to select when the repeater is active. This

can be used to isolate a badly behaved slave on power-up until after the system power-up

reset. It should never change state during an I²C-bus operation because disabling during

a bus operation hangs the bus and enabling part way through a bus cycle could confuse

the I²C-bus parts being enabled. The EN also puts the PCA9509P in a standby condition

to reduce power consumption.

PCA9509P

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3 — 19 July 2013

5 of 25

1 2 3 456 7 8...25

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