Datasheet

TDA8023_1 © NXP B.V. 2007. All rights reserved.
Product data sheet Rev. 01 — 16 July 2007 5 of 32
NXP Semiconductors
TDA8023
Low power IC card interface
7.2 Pin description
[1] I = input, O = output, S = supply, C = configuration.
[2] PRES is active-HIGH when SPRES = LOW and PRES is active-LOW when SPRES = HIGH.
[3] With integrated pull-up to V
DD(INTF)
.
[4] With integrated pull-up to V
CC
.
Table 3. Pin description
Symbol Pin Type
[1]
Description
VUP 1 O output of the DC-to-DC converter
INT 2 O Negative-channel Metal Oxide Semiconductor (NMOS) interrupt
to the host (active LOW and open-drain) (see fault detection in
Section 8.7 “Protection”)
SDWN 3 I shutdown and reset input
V
DDI
4 S interface positive supply voltage
SDA 5 I/O serial data line to/from the I
2
C-bus master (open-drain)
SCL 6 I serial clock line from the I
2
C-bus master
SAD0 7 I I
2
C-bus address selection
SPRES 8 I select PRES mode
[2]
CLKIN 9 I external clock input
GND 10 S ground connection
I/OUC 11 I/O
[3]
data in/out from/to microcontroller
C8 12 I/O
[4]
auxiliary input/output to/from the card (contact C8)
C4 13 I/O
[4]
auxiliary input/output to/from the card (contact C4)
I/O 14 I/O
[4]
data input/output to/from (contact C7 of) the card
GNDC 15 S ground connection for the card (contact C5)
CLK 16 O clock output to (contact C3 of) the card
V
CC
17 S supply voltage for the card (contact C1)
RST 18 O reset output to (contact C2 of) the card
PRES 19 I card presence input with a 10 ms built-in debouncing system
[2]
PORADJ 20 I input for changing the power-on reset threshold with an external
resistor bridge.
In case no external resistor bridge is used, it is mandatory to
connect this pin to GND to avoid possible perturbations.
CDEL 21 C delay capacitor connection for the voltage supervisor (1 ms per
2 nF)
V
DD
22 S power supply
SAM 23 C connection for the DC-to-DC converter
GNDP 24 S ground connection for the DC-to-DC converter
SBM 25 C connection for the DC-to-DC converter
V
DDP
26 S positive supply for the DC-to-DC converter
SBP 27 C connection for the DC-to-DC converter
SAP 28 C connection for the DC-to-DC converter