mfrc531 NXP Semiconductors, mfrc531 Datasheet - Page 92

• Manufacturer Part Number: mfrc531
• Description: Iso/iec 14443 Reader Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
MFRC531_34
Product data sheet
PUBLIC
13.3.2 Digital output pin characteristics
13.3.3 Antenna driver output pin characteristics
Pin RSTPD has Schmitt trigger CMOS characteristics. In addition, it is internally filtered by
a RC low-pass filter which causes a propagation delay on the reset signal.
Table 154. RSTPD input pin characteristics
The analog input pin RX has the input capacitance and input voltage range shown in
Table
Table 155. RX input capacitance and input voltage range
Pins D0 to D7, MFOUT and IRQ have CMOS output characteristics and behave as
defined in
Table 156. Digital output pin characteristics
Remark: Pin IRQ can be configured as open collector which causes the V
no longer applicable.
The source conductance of the antenna driver pins TX1 and TX2 for driving the
HIGH-level can be configured using the CwConductance register’s GsCfgCW[5:0] bits,
while their source conductance for driving the LOW-level is constant.
The antenna driver default configuration output characteristics are specified in
Symbol Parameter
I
V
t
Symbol
C
V
Symbol
V
V
I
LI
PD
O
th
i(dyn)
OH
OL
i
155.
input leakage current
threshold voltage
propagation delay
Table
Parameter
voltage
LOW-level output
voltage
output current
HIGH-level output
Parameter
input capacitance
dynamic input voltage
156.
Rev. 3.4 — 26 January 2010
056634
Conditions
positive-going threshold;
CMOS = V
negative-going threshold;
CMOS = V
Conditions
V
Conditions
V
V
V
V
source or sink; V
DDA
DDD
DDD
DDD
DDD
= 5 V; T
= 5 V; I
= 5 V; I
= 5 V; I
= 5 V; I
DDD
DDD
< 3.6 V
< 3.6 V
amb
OH
OH
OL
OL
= 1 mA
= 10 mA
= −1 mA
= −10 mA
= 25 °C
DDD
= 5 V
Min
−1.0
0.65V
0.25V
-
DDD
DDD
Min
-
1.1
ISO/IEC 14443 reader IC
Min
2.4
2.4
-
-
-
Typ Max
-
-
-
-
MFRC531
Typ
-
-
© NXP B.V. 2010. All rights reserved.
Typ
4.9
4.2
25
250
-
OH
+1.0
0.75V
0.4V
20
Max
15
4.4
values to be
Max
-
-
400
400
10
DDD
Table
DDD
92 of 116
Unit
pF
V
Unit
V
V
mV
mV
mA
Unit
μA
V
V
μs
157.