Versatile Power Management
and Smart Card Interface IC
Simplifying System Integration™
DATA SHEET
DS_8009C_025 February 2010
Rev. 1.5 © 2010 Teridian Semiconductor Corporation 1
DESCRIPTION
The Teridian 73S8009C is a versatile power
management and single smart card interface circuit
that is ideally suited for smart card reader products
that are battery and/or USB bus-powered. In
addition to its EMV 4.1 and ISO-7816-3 compliant
smart card-to-host interface circuitry; it provides
control, conversion, and regulation of power for a
companion host processor circuit and power for the
smart card. The 73S8009C can operate from a
single 2.7 V to 6.5 V source supply, or a
combination of battery power (4.0 V to 6.5 V) and
USB power (4.4 V to 5.5 V).
The 73S8009C supports 5 V, 3 V, and 1.8 V smart
cards. The smart card signals for RST, CLK, IO,
and auxiliary signals AUX1 and AUX2 are
level-shifted to the selected V
CC
value. Although
the host controller is required to handle the
detailed signal timing for activation and de-
activation under normal conditions, the 73S8009C
blocks any spurious signals on CLK, RST and IO
during power-up (as V
CC
rises) and power-down.
The 73S8009C contains two handshaking signals
for the controller: OFF indicates that a card is
present, and RDY indicates that V
CC
is at an
acceptable value. The 73S8009C will perform
emergency deactivation upon card removal,
voltage faults, or over-current events
The power management circuitry of the 73S8009C
allows operation from a wide range of voltages
from multiple sources. V
PC
is converted by using
an inductive, step-up power converter to the
intermediate voltage, V
P
. V
P
is used by linear
voltage regulators and switches to create the
voltages V
DD
and as required, V
CC
. V
DD
is used by
the 73S8009C and is also made available for the
companion controller circuit or other external
circuits. The V
BAT
and V
BUS
pins provide inputs
from alternate power sources as required. An
internal switch in the 73S8009C acts as a
single-pole, double-throw switch that selects either
V
BAT
or V
BUS
to be connected to V
PC
. When the
voltage on V
BUS
is zero, V
BAT
is connected to V
PC
.
When voltage is applied to V
BUS
, the switch selects
V
BUS
as the source for power.
When power is supplied by V
PC
or V
BAT
, the
73S8009C is controlled by the ON_OFF pin in the
manner of a “push-on/push-off” button action. The
OFF_REQ and OFF_ACK signals provide
handshaking and control of the power “off”
function by the controller. A SPST momentary
switch to ground connected to ON_OFF is all that
is required for power control. Alternatively, the
“off” state can be initiated from the host controller
through OFF_ACK. When the 73S8009C is “off,”
the current is less than 1 µA.
When power is supplied via the V
BUS
pin, the
73S8009C is unconditionally in the “power-on”
state regardless of the action of the ON/OFF
switch or OFF_ACK signal. Power supply current
operating from the V
BUS
power when V
CC
is off is
less than 500 µA to conform to USB “SUSPEND”
requirements.
APPLICATIONS
• Handheld PINpad smart card readers for
e-commerce, secure login, e-health, Gov’t ID
and loyalty
• Point of Sales & Transaction Terminals
• General Purpose Smart Card Readers
ADVANTAGES
• Ideally suited to USB bus-powered
applications
Ideal for combo bus-powered and/or
self-powered systems
Automatic battery switchover in bus
powered systems
• Very low-power mode (sub-µA) with
push-button ON/OFF switch input with
de-bounce
• Provides 3.3 V / 40 mA power to external
circuitry (host processor or peripheral circuits)
• The inductor-based DC-DC converter provides
higher current and efficiency than usual
charge-pump capacitor-based converters:
Ideal for battery-powered applications
