TCA5013 Datasheet, PDF (16/68 Pages) Texas Instruments – Feature Rich Smartcard Interface IC

TCA5013
SCPS253B – JANUARY 2014 – REVISED JANUARY 2016
www.ti.com
8.3 Feature Description
8.3.1 Card Interface Modules
TCA5013 has 1 user card interface module and 3 SAM card interface modules. All card modules have level
translators and an LDO to support interfacing with smartcards operating at different voltages.
8.3.2 SAM Card Interface Modules
All SAM card interface modules can operate per the EMV4.3 and ISO7816-3 standard and support asynchronous
operating mode. All SAM card interface modules have the standard IO, CLK and RST pins. Detailed operation of
these pins is described in section IO operation, CLK operation and RST operation.
8.3.3 User Card Interface Module
User card interface module can also operate per the EMV4.3 and ISO7816-3 standard and support
asynchronous operating mode. In addition, the user card interface module also supports synchronous type 1
operating mode and synchronous type 2 operating mode, per ISO7816-10. Like the SAM card interface modules,
the user card interface module also has IO, CLK, and RST pins. The user card interface module also has a
PRES pin that is used for detection of user card insertion or removal.
C4 and C8 are two pins that are only present on the user card interface. These are open drain bi-directional IOs
that are controlled by the bit [5] and bit [4] of user card synchronous mode settings register (Reg 0x09) when the
card interface is activated. These bits act as both control and status bits for the C4 and C8 signals. If a ‘0’ is
written to either of these bits the corresponding pin is driven low by the TCA5013. However, when a ‘1’ is written
to the register bit, the corresponding pin is pulled up by an internal pull-up resistor. In this state an external
device can drive the pin low. If the pin is driven low, then the corresponding bit in the register changes to reflect
the status of the pin.
8.3.4 Clock Division and Multiplexing
TCA5013 card interface modules all have a CLK pin that provide a clock signal that is used for smartcard
operation. This clock signal is generated based on an internal oscillator or from the CLKIN1/CLKIN2 input clock
signals, by the clock divider and multiplexer circuitry. The user card has a dedicated clock divider and
multiplexer. The user card CLK output can be a configured to be a function of the CLKIN1 frequency or the
internal oscillator frequency. CLKIN2 is shared by all the SAM card interface modules. The CLK output of each
SAM card can be independently configured based on the CLKIN2 frequency or the internal oscillator frequency.
CLK operation section describes the clock division and multiplexing in detail.
8.3.5 IO Multiplexing
IOMC1 and IOMC2 are connected to the IO pins in the card interface modules through IO multiplexer blocks.
The user card IO module has a dedicated IO multiplexer, that can be connect or disconnect IOUC from the
IOMC1 pin. The IOMC2 is connected to the SAM card interface modules IO pins through the SAM IO multiplexer
block. The IOMC2 can only be connected to one of the SAM interface modules at any given time. IO operation
section describes IO multiplexing in detail.
8.3.6 GPIO Operation
The TCA5013 has four 5 V tolerant open drain GPIO pins that can be configured as inputs or outputs through
device settings register (Reg 0x42). If configured as outputs, each is capable of sinking up to 10mA of current. If
configured as inputs they will assert the INT line when a state change occurs on the pin. The minimum pulse
width for transition detection is 10 µs, that is, when a state transition occurs on a GPIO configured as an input, it
needs to hold its state for a minimum of 10 µs in order to guarantee detection by the TCA5013. This, however,
does not imply any glitch rejection on the GPIO pins. The GPIOs are available in Standby Mode and Active
Mode. GPIO state transitions are not tracked in shutdown mode.
8.3.7 Power Management Features
TCA5013 has a DC-DC boost and card LDOs that enable it to generate regulated smart card V_CC from its input
power rails (V_DD and V_DDI). It also has an internal LDO that is used to power its internal circuits. The TCA5013
devices also have a voltage supervisor that monitors the V_DD and V_DDI rails to ensure they are stable and usable
for smartcard operation.
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