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TDA8023 Datenblatt(PDF) 7 Page - NXP Semiconductors

Teilenummer TDA8023
Bauteilbeschribung  Low power IC card interface
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Hersteller  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

TDA8023 Datenblatt(HTML) 7 Page - NXP Semiconductors

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TDA8023_1
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 01 — 16 July 2007
7 of 32
NXP Semiconductors
TDA8023
Low power IC card interface
8.2.2 With external divider on pin PORADJ
If an external resistor bridge is connected to pin PORADJ (R1 to GND and R2 to VDD as
shown in Figure 1 and Figure 2), then the internal threshold voltages and the internal
hysteresis voltage are overridden by externally determined ones.
The voltage on pin PORADJ is:
where
The thresholds that are applied by the TDA8023 to this voltage VPORADJ are:
(rising)
(falling)
where
Vbg(int) = 1.25 V (typ)
Vhys = 60 mV (typ)
The thresholds and hysteresis on VDD can then be calculated from:
(rising)
(falling)
The minimum threshold voltage Vth(POR)L should be chosen higher than 2 V.
Input PORADJ is biased internally with a pull-down current source of 4
µA which is cut
when the voltage on this pin exceeds 1 V. This ensures that after detection of the external
bridge during power-on, the input current on this pin does not cause inaccuracy of the
bridge voltage.
8.2.3 External capacitor on pin CDEL
The width of the POR pulse (tW) is externally set by the value of the CDEL capacitor: the
typical value is 1 ms per 2 nF. Usually CCDEL = 22 nF, therefore tW = 10 ms (typ).
V
PORADJ
R1
R1
R2
+
--------------------
V
DD
×
kV
DD
×
==
k
R1
R1
R2
+
--------------------
=
V
th H
() PORADJ
()
V
bg int
()
V
hys
2
-----------
+
=
V
th L
() PORADJ
()
V
bg int
()
V
hys
2
-----------
=
V
th POR
()H
V
th H
() PORADJ
()
k
--------------------------------------
V
bg int
()
V
hys
2
-----------
+


k
-----------------------------------------
==
V
th POR
()L
V
th L
() PORADJ
()
k
-------------------------------------
V
bg int
()
V
hys
2
-----------


k
-----------------------------------------
==
V
hys POR
()
V
hys
k
-----------
=


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