PCA9522DP Просмотр технического описания (PDF) - NXP Semiconductors.
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PCA9522DP Datasheet PDF : 20 Pages
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NXP Semiconductors
PCA9522
Fast dual bidirectional bus buffer with hot insertion logic
10.2 Input to output offset voltage calculation
The offset voltage between the side acting as the output (Sxxx(out)) and the side acting as
the input (Sxxx(in)) of the PCA9522 can be calculated using the relationship given in
Equation 1:
Voffset
=
Vi + 50
m
V
+
V----B-R---U---S-
11
(1)
This calculation is valid for VSxxx(in) 200 mV, as below this point the saturation voltage of
the open-collector output drive transistor will begin to affect the characteristic. Input and
output voltages are shown in millivolts, VBUS (the supply voltage to the bus) is in volts, and
R is in ohms.
An example calculation for VBUS = 3.3 V, VSxxC = 200 mV, the resistance R pulling up
SxxB is 2 k, then the voltage on SxxB is typically:
VSxxB
=
200
mV + 50
mV
+
2---30---.-03--0--
11
=
268
mV
(2)
This can be compared with the offset characteristic shown in Figure 5.
PCA9522
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 28 September 2011
© NXP B.V. 2011. All rights reserved.
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