TDA8003TSSLASHC2 datasheet(8/24 Pages) PHILIPS

8 / 24 page

2000 Apr 20

Philips Semiconductors

Product speciﬁcation

I2C-bus SIM card interface

TDA8003TS

Power supply

The circuit operates within a supply voltage range of

2.5 to 6 V. The supply pins are VDDS and SGND. Pins

VDDP and PGND only supply the DC-to-DC converter for

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 VCC generator.

All interface signals with the microcontroller (PWROFF,

SIMCLK, SAD1, SAD0, SIMERR, SCL, SDA and SIMI/O)

are referenced to a separate supply pin VDDI, which may

be different from VDD (1.5 ≤ VDDI ≤ 6 V).

The pull-up resistors on bus lines SDA and SCL may be

referenced to a voltage higher than VDDI. This allows the

use of peripherals which do not operate at VDDI.

The voltage supervisor (see Fig.3) senses VDDS. It

generates an alarm pulse, whose length tW is defined by

an external capacitor connected to pin DEL, when VDD is

too low to ensure proper operation (1 ms per 1 nF typical).

During this alarm pulse, SIMERR is LOW and the I2C-bus

is unresponsive. SIMERR goes back to HIGH, and the

I2C-bus becomes operational at the end of this alarm

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.

Fig.3 Voltage supervisor.

handbook, full pagewidth

MGR436

VDDS

DEL

I2C-bus unresponsive

I2C-bus

unresponsive

I2C-bus

unresponsive

I2C-bus OK

status read

after event

I2C-bus OK

SIMERR

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