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PCE85176AUG/DA bảng dữ liệu(PDF) 34 Page - NXP Semiconductors

tên linh kiện PCE85176AUG/DA
Giải thích chi tiết về linh kiện  4 횞 40 LCD segment driver for Chip-On-Glass
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PCE85176AUG/DA bảng dữ liệu(HTML) 34 Page - NXP Semiconductors

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PCE85176AUG
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet
Rev. 1 — 12 January 2015
34 of 48
NXP Semiconductors
PCE85176AUG
4 × 40 LCD segment driver for Chip-On-Glass
14. Application information
14.1 Track resistance on the I2C-bus lines
The SDA line of an I2C device is an open-drain output which therefore needs an external
pull-up resistor (RPU). In Chip-On Glass (COG) applications, the track resistance (RITO)
from the SDA pin to the SDA system line can be significant. For this reason, it is possible
that the two resistances are forming a voltage divider. Such a divider could prevent that
the acknowledge cycle generated by the PCE85176AUG can be interpreted as logic 0 by
the master. To guarantee a valid LOW level, it is necessary that the RITO from the SDA pin
to the SDA system line is minimized.
The logic output voltage is calculated with Equation 6:
(6)
For further information on this topic, see Ref. 1 “AN10170”.
(1) Includes track resistance RITO.
Fig 26. Track resistances on the SDA and VSS line
V
O(log)
R
I(SDA)
R
I(VSS)
+
R
PU
R
I(SDA)
R
I(VSS)
++
-------------------------------------------------------
V
DD
=



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