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PCA9617A

NXP Semiconductors
Part Number PCA9617A
Manufacturer NXP Semiconductors
Description Level translating Fm I2C-bus repeater
Published Sep 6, 2013
Detailed Description PCA9617A Level translating Fm+ I2C-bus repeater Rev. 1 — 20 March 2013 Product data sheet 1. General description The PC...
Datasheet PDF File PCA9617A PDF File

PCA9617A
PCA9617A


Overview
PCA9617A Level translating Fm+ I2C-bus repeater Rev.
1 — 20 March 2013 Product data sheet 1.
General description The PCA9617A is a CMOS integrated circuit that provides level shifting between low voltage (0.
8 V to 5.
5 V) and higher voltage (2.
2 V to 5.
5 V) Fast-mode Plus (Fm+) I2C-bus or SMBus applications.
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 two buses of 540 pF at 1 MHz or up to 4000 pF at lower speeds.
Using the PCA9617A enables the system designer to isolate two halves of a bus for both voltage and capacitance.
The SDA and SCL pins are overvoltage tolerant and are high-impedance when the PCA9617A is unpowered.
The 2.
2 V to 5.
5 V bus port B drivers have the static level offset, while the adjustable voltage bus port A drivers eliminate the static offset voltage.
This results in a LOW on the port B translating into a nearly 0 V LOW on the port A which accommodates the smaller voltage swings of lower voltage logic.
The static offset design of the port B PCA9617A I/O drivers prevents them from being connected to the static or incremented offset of other bus buffers.
Port A of two or more PCA9617As can be connected together, however, to allow a star topography with port A on the common bus, and port A can be connected directly to any other buffer with static or incremented offset outputs.
Multiple PCA9617As can be connected in series, port A to port B, with no build-up in offset voltage with only time of flight delays to consider.
The PCA9617A drivers are not enabled unless VCC(A) is above 0.
8 V and VCC(B) is above 2.
2 V.
The EN pin is referenced to VCC(B) and 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 enable pin when the bus is idle.
The output pull-down on the port B internal bu...


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