DS8007
Multiprotocol Dual Smart Card Interface
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Pin Description
PIN NAME FUNCTION
1 RSTOUT
Reset Output. This active-high output is provided for resetting external devices. The RSTOUT pin is driven
high until the DELAY pin reaches V
DRST
. Once the DELAY pin reaches V
DRST
, the RSTOUT pin is three-
stated so it can externally be pulled down. The SUPL bit is set for each RSTOUT pulse.
2 I/OAUX Auxiliary I/O. This I/O pin allows connection to an auxiliary smart card interface.
3 I/OA
Smart Card A I/O Data Line. This is the I/O data line associated with smart card A. This is also referred to
as the ISO C7 contact.
4 C8A
Smart Card A Auxiliary I/O. This is an auxiliary I/O associated with smart card A. This is also referred to
as the ISO C8 contact. This can be associated with synchronous cards.
5 PRESA Smart Card A Presence Contact. This is the active-high presence contact associated with smart card A.
6 C4A
Smart Card A Auxiliary I/O. This is an auxiliary I/O associated with smart card A. This is also referred to
as the ISO C4 contact. This can be associated with synchronous cards.
7 GNDA Smart Card A Ground. This must be connected to GND.
8 CLKA
Smart Card A Clock Output. This is the clock output associated with smart card A. This is also referred to
as the ISO C3 contact.
9 V
CCA
Smart Card A Supply Voltage. This is the supply voltage output associated with smart card A. This is also
referred to as the ISO C1 contact.
10 RSTA
Smart Card A Reset. This is the reset output associated with smart card A. This is also referred to as the
ISO C2 contact.
11 I/OB
Smart Card B I/O Data Line. This is the I/O data line associated with smart card B. This is also referred to
as the ISO C7 contact.
12 C8B
Smart Card B Auxiliary I/O. This is an auxiliary I/O associated with smart card B. This is also referred to
as the ISO C8 contact. This can be associated with synchronous cards.
13 PRESB Smart Card B Presence Contact. This is the active-high presence contact associated with smart card B.
14 C4B
Smart Card B Auxiliary I/O. This is an auxiliary I/O associated with smart card B. This is also referred to
as the ISO C4 contact. This can be associated with synchronous cards.
15 GNDB Smart Card B Ground. This must be connected to GND.
16 CLKB
Smart Card B Clock Output. This is the clock output associated with smart card B. This is also referred to
as the ISO C3 contact.
17 V
CCB
Smart Card B Supply Voltage. This is the supply voltage output associated with smart card B. This is also
referred to as the ISO C1 contact.
18 RSTB
Smart Card B Reset. This is the reset output associated with smart card B. This is also referred to as the
ISO C2 contact.
19 GND Ground
20 V
UP
Step-Up Converter Connection. Connect a low-ESR capacitor of 220nF between this pin and ground.
21 CPA1 Step-Up Converter Contact 1. Connect a low-ESR capacitor of 220nF between CPA1 and CPA2.
22 CPB1 Step-Up Converter Contact 3. Connect a low-ESR capacitor of 220nF between CPB1 and CPB2.
23 V
DDA
Analog Supply Voltage. Positive analog-supply voltage for the step-up converter; can be higher but not
lower than V
DD.
This pin should be decoupled to AGND with a good quality capacitor.
