TDA8003TS Philips Semiconductors, TDA8003TS Datasheet - Page 9

• Manufacturer Part Number: TDA8003TS
• Description: I2C-bus SIM card interface
• Manufacturer: Philips Semiconductors

Philips Semiconductors
DC-to-DC converter
The whole circuit is powered by V
V
interface signals.
The DC-to-DC converter acts as a doubler or a tripler,
depending on the supply voltage V
voltage V
The supply voltage is recognized by the TDA8003TS at
approximately 3.75 V for the C1 and 3.3 V for the C2.
When a card session is requested by the microcontroller,
the sequencer will first start the DC-to-DC converter, which
is a switched capacitor type, clocked by an internal
oscillator at a frequency f
The output voltage V
4.5 or 6.5 V and subsequently fed to the V
V
contacts.
Power-down mode
The Power-down mode is used for current consumption
reduction when the card is in Sleep mode.
To enter Power-down mode, the microcontroller must first
select CLK in this mode (stop LOW, stop HIGH or
1.25 MHz from the internal oscillator) with bits CLKPD1
and CLKPD2. Subsequently, the microcontroller sends the
command PDOWN, CLK is switched to the value
predefined by bits CLKPD1 and CLKPD2, and SIMCLK
may be stopped (HIGH or LOW).
If the selected CLK is stopped, the biasing currents in the
buffers to the card will be reduced. The voltage supervisor
and all control functions also remain active. The maximum
current taken by the card in this mode when CLK is
stopped is assumed to be less than 5 mA.
Before leaving the Power-down mode, the clock signal
must first be applied to SIMCLK, and then bit PDOWN
must be set to logic 0.
2000 Apr 20
CC
CC
V
as a doubler with a regulation of V
4.5 V
V
as a tripler with a regulation of V
6.5 V
V
disabled and V
V
as a doubler with a regulation of V
6.5 V.
I
2
DD
DD
DD
DD
generator, the other card contact buffers and the
and PGND are used as a reference for all other card
C-bus SIM card interface
= 3 V and V
= 3 V and V
= 5 V and V
= 5 V and V
CC
. There are basically four possible situations:
DD
CC
CC
CC
CC
is applied to pin VUP
VUP
= 3 V. The DC-to-DC converter acts
= 5 V. The DC-to-DC converter acts
= 5 V. The DC-to-DC converter acts
= 3 V. The DC-to-DC converter is
is regulated at approximately
osc
of approximately 2.5 MHz.
DDS
DD
VUP
VUP
VUP
, except for the
and the card supply
at approximately
at approximately
at approximately
CC
generator.
9
Off mode
The Off mode is entered when the PWROFF signal is
LOW. In this mode, no function is valid. This mode avoids
switching off the power supply of the device, and gives a
current consumption less than 2 A. Before entering the
Off mode, the card must be deactivated.
The Off mode is resumed when the PWROFF signal
returns to HIGH. This re-initializes the voltage supervisor,
and has the same effect as a reset of the device. As long
as the device is not ready to operate, the SIMERR signal
will remain LOW.
Sequencer and clock counter
The sequencer handles the ensuring activation and
deactivation sequences in accordance with GSM11.11
and ISO 7816, even in case of emergency (card take-off,
short circuit and supply drop-out). The sequencer is
clocked with the internal oscillator frequency f
The activation is initiated with the START command (only
if the card is present, and if the voltage supervisor does not
detect a fault on the supply). During activation, V
HIGH and subsequently I/O is enabled and CLK is started
with RST = LOW. The clock counter counts the CLK
pulses till a start bit is detected on I/O.
After 45000 CLK pulses for the C1 (44745 for the C2), if no
start bit on I/O has been detected, the sequencer toggles
RST to HIGH, and counts again 45000 CLK pulses
(44745 for the C2). If, again, no start bit has been
detected, SIMERR will be pulled LOW and the information
of bit MUTE is set in the status register.
If a start bit has been detected during the two 45000 CLK
pulse slots (44745 for the C2), the clock counter is
stopped, RST is kept at the same level and the session
can go on between the card and the system.
The clock counter does not take care of any start bit during
the 200 first CLK pulses of both slots; if a start bit is
detected between 200 and 352 CLK pulses of both slots,
then SIMERR will be pulled LOW and the information of
bit EARLY is set in the status register.
The deactivation is initiated either by the microcontroller
(STOP command), or automatically by the TDA8003TS in
case of card take-off, short circuit or supply voltage
drop-out detected by the voltage supervisor. During
deactivation, RST will go LOW, CLK is stopped, I/O is
disabled and V
CC
goes LOW.
TDA8003TS
Product specification
osc
.
CC
goes