PCA9306DC1SLASHDG datasheet(10/38 Pages) NXP

10 / 38 page

NXP Semiconductors

PCA9306

Dual bidirectional I2C-bus and SMBus voltage-level translator

bus controller output can be totem pole or open-drain (pull-up resistors may be required)

and the I2C-bus device output can be totem pole or open-drain (pull-up resistors are

required to pull the SCL2 and SDA2 outputs to Vpu(D)). However, if either output is totem

pole, data must be unidirectional or the outputs must be 3-stateable and be controlled

by some direction-control mechanism to prevent HIGH-to-LOW contentions in either

direction. If both outputs are open-drain, no direction control is needed.

The reference supply voltage (Vref(1)) is connected to the processor core power supply

voltage. When VREF2 is connected through a 200 kΩ resistor to a 3.3 V to 5.5 V Vpu(D)

power supply, and Vref(1) is set between 1.0 V and (Vpu(D) - 1 V), the output of each SCL1

and SDA1 has a maximum output voltage equal to VREF1, and the output of each SCL2

and SDA2 has a maximum output voltage equal to Vpu(D).

Refer to Figure 9.

Symbol

Parameter

Conditions

Min

Typ[1]

Max

Unit

Vbias(ref)(2) reference bias voltage (2)

Vref(1) + 0.6 2.1

VI(EN)

input voltage on pin EN

Vref(1) + 0.6 2.1

Vref(1)

reference voltage (1)

1.5

4.4

Isw(pass)

pass switch current

Iref

reference current

transistor

μA

Tamb

ambient temperature

operating in

free-air

-40

+105

°C

Table 10. Application operating conditions

[1]

All typical values are at Tamb = 25 °C.

11.2 How to size pull-up resistor value

Sizing the pull-up resistor on an open-drain bus is specific to the individual application

and is dependent on the following driver characteristics:

• The driver sink current

• The VOL of driver

• The VIL of the driver

• Frequency of operation

The following tables can be used to estimate the pull-up resistor value in different use

cases so that the minimum resistance for the pull-up resistor can be found.

Table 11, Table 12 and Table 13 contain suggested minimum values of pull-up resistors

for the PCA9306 and NVT20xx devices with typical voltage translation levels and drive

currents. The calculated values assume that both drive currents are the same. VOL = VIL

= 0.1 × VCC and accounts for a ±5 % VCC tolerance of the supplies, ±1 % resistor values.

It should be noted that the resistor chosen in the final application should be equal to or

larger than the values shown in Table 11, Table 12 and Table 13 to ensure that the pass

voltage is less than 10 % of the VCC voltage, and the external driver should be able to

sink the total current from both pull-up resistors. When selecting the minimum resistor

value in Table 11, Table 12 or Table 13, the drive current strength that should be chosen

should be the lowest drive current seen in the application and account for any drive

strength current scaling with output voltage. For the GTL devices, the resistance table

should be recalculated to account for the difference in ON resistance and bias voltage

limitations between VCC(B) and VCC(A).

PCA9306

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

Product data sheet

Rev. 9.3 — 14 November 2022

10 / 38

PCA9306DC1/DG Datasheet(PDF) 10 Page - NXP Semiconductors

PCA9306DC1/DG Datasheet(HTML) 10 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

Datasheet Download

Link URL