Datasheet > PCA950PGM

PCA950PGM

更新时间： 2022-03-23 21:25:20

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
23页	1093K
描述
Low power level translating I2C-bus/SMBus repeater

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PCA950PGM 数据手册

PCA9509P

Low power level translating I²C-bus/SMBus repeater

Rev. 1 — 14 August 2012

Product data sheet

1. General description

The PCA9509P is a level translating I²C-bus/SMBus repeater with two voltage supplies

that enables processor low voltage 2-wire serial bus to interface with standard I²C-bus or

SMBus I/O. While retaining all the operating modes and features of the I²C-bus system

during the level shifts, it also permits extension of the I²C-bus by providing bidirectional

buffering for both the data (SDA) and the clock (SCL) lines, thus enabling the I²C-bus or

SMBus maximum capacitance of 400 pF on the higher voltage side. Port A allows a

voltage range from 0.8 V to 1.5 V and is overvoltage tolerant. Port B allows a voltage

range from 2.3 V to 5.5 V and is overvoltage tolerant. Both port A and port B SDA and

SCL pins are high-impedance when the PCA9509P is unpowered.

The bus port B drivers are compliant with SMBus I/O levels, while port A uses an offset

LOW which prevents bus lock-up and allows the bidirectional nature of the device. The

output pull-down on the port A internal buffer LOW is set for approximately 0.2V_CC(A)

while the input threshold of the internal buffer is set about 0.1V_CC(A)lower than that of the

output voltage LOW. When the port A I/O is driven LOW internally, the LOW is not

recognized as a LOW by the input. This prevents a lock-up condition from occurring. The

output pull-down on the port B drives a hard LOW and the input level is set at 0.3 of

SMBus or I²C-bus voltage level which enables port B to connect to any other I²C-bus

devices or buffer.

The PCA9509P drivers are not enabled unless V_CC(A)is above 0.7 V and V_CC(B)is above

1.7 V. The enable (EN) pin can also be used to turn the drivers on and off under system

control. Caution should be observed to only change the state of the EN pin when the bus

is idle.

The PCA9509P is the same as the PCA9509A but without the port A internal current

source to allow high value pull-up resistors to reduce current consumption in portable

applications.

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