tda8001t NXP Semiconductors, tda8001t Datasheet - Page 8

• Manufacturer Part Number: tda8001t
• Description: Smart Card Interface
• Manufacturer: NXP Semiconductors

Philips Semiconductors
R
When the activation sequence is completed and, after the
card has replied its Answer-to-Reset, the TDA8001 will be
in the READ mode. Data is exchanged between the card
and the microcontroller via the I/O line.
W
Cards with EPROM memory need a programming voltage
(V
of the card, the microcontroller sets one of the VPP12.5,
VPP15 and VPP21 lines LOW, according to the
programming value given in the Answer-to-Reset.
V
rate of 0.38 V/ s. In order to respect the ISO 7816 slopes,
the circuit generates V
internal capacitor. The voltage on this capacitor is then
amplified by a power stage gain of 5, powered via an
external supply pin V
D
When the session is completed, the microcontroller sets
the CMDVCC line to its HIGH state. The circuit then
executes an automatic deactivation sequence by counting
the sequencer back:
1996 Dec 12
handbook, full pagewidth
PP
EAD MODE
EACTIVATION SEQUENCE
RITE MODE
PP
RST falls to LOW and CLK is stopped
I/O( C) becomes high impedance and V
V
Smart card interface
CC
rises from 5 V to the selected value with a typical slew
). When it is required to write to the internal memory
falls to 0 V.
V DELAY
ALARM
V SUP
H
PP
(30 V max).
Fig.4 Alarm and delay as a function of V
(see Fig.8)
by charging and discharging an
PP
falls to 0 V
8
The circuit returns to the IDLE mode on the next rising
edge of the clock.
P
Main fault conditions are monitored by the circuit:
When one of these fault conditions is detected, the circuit
pulls the interrupt line OFF to its active LOW state and
returns to the FAULT mode. The current on I/O is internally
limited to 5 mA.
F
When a fault condition is written to the microcontroller via
the OFF line, the circuit initiates a deactivation sequence.
After the deactivation sequence has been completed, the
OFF line is reset to its HIGH state after the microcontroller
has reset the CMDVCC line HIGH.
t d
AULT MODE
ROTECTIONS
Short-circuit or overcurrent on V
Short-circuit or overcurrent on V
Card extraction during transaction
Overheating problem
V
V
SUP
SUP
DD
(C
drop-out.
drop-out
DEL
(see Fig.9)
fixes the pulse width).
CC
PP
Product specification
V th2
V th2
V th3
MGG818
TDA8001
V hys2