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NVT2003DP Datasheet(PDF) 9 Page - NXP Semiconductors |
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NVT2003DP Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 33 page NVT2003_04_06 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved. Product data sheet Rev. 5 — 19 February 2014 9 of 33 NXP Semiconductors NVT2003/04/06 Bidirectional voltage-level translator 7.4 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 6, Table 7 and Table 8 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 6, Table 7 and Table 8 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 6, Table 7 or Table 8, 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). The applied enable voltage Vpu(H) and the applied voltage at Vref(A) and Vref(B) should be such that Vref(H) is at least 1 V higher than Vref(A) and Vref(B) for best translator operation. Fig 10. Bidirectional level shifting between two different power domains 002aae967 A1 A2 VREFA GND 3 4 VREFB 1 8 7 B1 B2 10 EN SW SW NVT2003 9 200 k Ω RPU RPU Vpu(B) = 3.3 V I2C-BUS DEVICE SCL SDA VCC GND 2 Vpu(A) = 3.3 V RPU RPU I2C-BUS MASTER SCL SDA VCC GND Vpu(H) A3 5 6 SW B3 Vpu(B) |
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