Datasheet

73S8009R Data Sheet DS_8009R_056
6 Rev. 1.3
Table 1 describes the pin functions for the device.
Table 1: 73S8009R Pin Definitions
Pin
Name
Pin
(SO28)
Pin
(QFN20)
Type Description
Card Interface
I/O 25 15 IO Card I/O: Data signal to/from card. Includes a pull-up
resistor to V
CC.
AUX1 24 NA IO AUX1: Auxiliary data signal to/from card. Includes a pull-up
resistor to V
CC.
AUX2 23 NA IO AUX2: Auxiliary data signal to/from card. Includes a pull-up
resistor to V
CC.
RST 21 13 O Card reset: provides reset signal to card.
CLK 19 11 O Card clock: provides clock signal to card. The rate of this
clock is determined by the external clock frequency
provided on pin CLKIN.
PRES 26 16 I Card Presence switch: active high indicates card is present.
Should be tied to GND when not used, but includes a high-
impedance pull-down current source.
PRES 16 10 I Card Presence switch: active low indicates card is present.
Should be tied to VDD when not used, but includes a high-
impedance pull-up current source.
VCC 22 14 PSO Card power supply – logically controlled by the sequencer,
output of LDO regulator. Requires an external filter
capacitor to GND.
GND 20 NA GND Card ground.
Miscellaneous Inputs and Outputs
CLKIN 11 5 I Clock source for the card clock.
TEST1 2 19 – This pin must be tied to GND in typical applications.
TEST2 14 8 – This pin must be tied to GND in typical applications.
NC 3,17,18 NA – Non-connected pin.
Power Supply and Ground
VDD 28 17 System interface supply voltage and supply voltage for
internal circuitry.
VPC 15 9 LDO regulator power supply source.
GND 27 12 GND Ground.
Microcontroller Interface
CS 1 18 I When CS = 1, the control and signal pins are configured
normally. When CS is set low, CMDVCC%, RSTIN, and
CMDVCC# are latched, IOUC, AUX1UC, and AUX2UC are
set to high-impedance pull-up mode and do not pass data
to or from the smart card. Signals RDY and OFF are
disabled to prevent a low output and the internal pull-up
resistors are disconnected.
OFF 4 20 O Interrupt signal to the processor. Active low, multi-function
indicating fault conditions and card presence. Open drain
output configuration. It includes an internal 20 kΩ pull-up to
VDD. The pull-up is disabled in PWRDN and CS=0 modes.