Philips TDA8002C Bedienungsanleitung PDF herunterladen (Seite 10)

1999 Oct 12 10

Philips Semiconductors Product speciﬁcation

IC card interface TDA8002C

Table 1 Clock circuitry deﬁnition

Notes

1. X = don’t care.

2. In low-power mode.

3. f

int

= 32 kHz in low-power mode.

MODE CLKSEL CLKDIV1 CLKDIV2

FREQUENCYOF

CLK

FREQUENCYOF

CLKOUT

HIGH LOW HIGH LOW

⁄

int

⁄

int

HIGH LOW LOW LOW

⁄

xtal

HIGH LOW LOW HIGH

⁄

xtal

HIGH LOW HIGH HIGH STOP low f

xtal

HIGH HIGH X

(1)

STROBE f

xtal

LOW

(2)

(1)

STOP low

⁄

int

(3)

I/O circuitry

The three I/O transceivers are identical. The state is HIGH

for all I/O pins (i.e. I/O, I/OUC, AUX1, AUX1UC, AUX2 and

AUX2UC). Pin I/O is referenced to V

and pin I/OUC to

, thus ensuring proper operation in the event that

≠ V

The first side on which a falling edge is detected becomes

a master (input). An anti-latch circuitry first disables the

detection of the falling edge on the other side, which

becomes slave (output), see Fig.8.

After a delay time t

(between 50 and 400 ns), the logic 0

present on the master side is transferred on the slave side.

When the input is back to HIGH level, a current booster is

turned on during the delay t

on the output side and then

both sides are back to their idle state, ready to detect the

next logic 0 on any side.

In the event of a conflict, both lines may remain LOW until

the software enables the lines to be HIGH. The anti-latch

circuitry ensures that the lines do not remain LOW if both

sides return HIGH, regardless of the prior conditions.

The maximum frequency on the lines is approximately

200 kHz.

When CS is HIGH, I/OUC, AUX1UC and AUX2UC are

internally pulled-up to V

with 20 kΩ resistors. When

CS is LOW, I/OUC, AUX1UC and AUX2UC are

permanently HIGH (with integrated 100 kΩ pull-up

resistors connected to V

Fig.8 Master and slave signals.

handbook, full pagewidth

MGD703

I/O

I/OUC

conflict idle

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 27 28

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