TDA8003TS Philips Semiconductors, TDA8003TS Datasheet - Page 8

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

Philips Semiconductors
Power supply
The circuit operates within a supply voltage range of
2.5 to 6 V. The supply pins are V
V
the analog drivers to the card and must be decoupled
externally because of the large current spikes that the card
and the DC-to-DC converter can create. An integrated
spike killer ensures the card contacts to remain inactive
during power-up or power-down. An internal voltage
reference is generated for the DC-to-DC converter, the
voltage supervisor and the V
All interface signals with the microcontroller (PWROFF,
SIMCLK, SAD1, SAD0, SIMERR, SCL, SDA and SIMI/O)
are referenced to a separate supply pin V
be different from V
The pull-up resistors on bus lines SDA and SCL may be
referenced to a voltage higher than V
use of peripherals which do not operate at V
2000 Apr 20
handbook, full pagewidth
DDP
I
2
C-bus SIM card interface
and PGND only supply the DC-to-DC converter for
SIMERR
V DDS
DEL
DD
(1.5
I
2
C-bus unresponsive
V
CC
DDI
generator.
DDS
6 V).
t W
and SGND. Pins
DDI
. This allows the
DDI
DDI
, which may
Fig.3 Voltage supervisor.
.
I
2
C-bus OK
status read
8
after event
The voltage supervisor (see Fig.3) senses V
generates an alarm pulse, whose length t
an external capacitor connected to pin DEL, when V
too low to ensure proper operation (1 ms per 1 nF typical).
During this alarm pulse, SIMERR is LOW and the I
is unresponsive. SIMERR goes back to HIGH, and the
I
pulse. Bit SUPL is set as long as the status has not been
read.
It is also used to either block any spurious signals on card
contacts during microcontroller reset, or to force an
automatic deactivation of the contacts in the event of
supply drop-out.
Outside a card session, SIMERR is LOW as long as the
voltage supervisor is active. If a supply drop-out occurs
during a session, SIMERR falls to LOW, bit START is
cleared and an automatic deactivation is initiated.
2
C-bus becomes operational at the end of this alarm
unresponsive
I
2
C-bus
t W
I
2
C-bus OK
unresponsive
TDA8003TS
Product specification
I
2
C-bus
W
MGR436
is defined by
DDS
. It
2
C-bus
DD
is