TDA8006 Datasheet, PDF (26/40 Pages) NXP Semiconductors – Multiprotocol IC Card coupler

Philips Semiconductors
Multiprotocol IC Card coupler
Product specification
TDA8006
handbook,_Cfu_Mll _Dpa_Vg_Cew_Cidth
OFF
RST
CLK
I/O
VCC
MGR238
Fig.14 Emergency deactivation sequence after V_CC short circuited to ground.
Auxiliary contacts C4 and C8
The auxiliary contacts C4 and C8 are controlled by ports
P34 and P35 through two identical pseudo-bidirectional
I/O lines.
In the Idle state, port P34 is pulled HIGH to V_DD by an
integrated 20 kΩ resistor and C4 is pulled HIGH to V_CC by
an integrated 10 kΩ resistor. This allows operation with a
V_CC value of 3 V and a V_DD value of 5 V. The first side on
which a falling edge occurs becomes the master.
An anti-latch circuit disables the detection of a falling edge
on the other side, which becomes the slave.
After a delay of approximately 200 ns (t_d), the N transistor
on the slave side is turned on which transmits the ‘0’
present on the master side. When the master side goes
back to logic 1, the P transistor on the slave side is turned
on during t_d, and then both sides return to their idle states.
The maximum frequency on the I/O lines is 1 MHz.
2000 Feb 21
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