73S8009C Datasheet, PDF (1/33 Pages) Teridian Semiconductor Corporation – Versatile Power Management and Smart Card Interface IC

73S8009C
Versatile Power Management
and Smart Card Interface IC
Simplifying System Integration™
DATA SHEET
DS_8009C_025
January 2010
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 two pins, V_BAT and V_BUS 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 will
select 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
signals OFF_REQ and OFF_ACK 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
Rev. 1.4
© 2010 Teridian Semiconductor Corporation
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