73S8009C Maxim, 73S8009C Datasheet - Page 8

• Manufacturer Part Number: 73S8009C
• Description: The 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
• Manufacturer: Maxim

73S8009C Data Sheet
8
Pin
Name
VBUS
LIN
VP
GND
Microcontroller Interface
CS
OFF
I/OUC
AUX1UC
AUX2UC
CMDVCC%
CMDVCC#
RSTIN
RDY
Pin
(QFN32)
28,31
23
27
15
12
32
1
2
3
4
5
6
8
Type
PSO
PSI
IO
IO
IO
O
I
I
I
I
Equivalent
Figure 13
Figure 13
Figure 18
Figure 12
Figure 17
Figure 17
Figure 17
Figure 18
Figure 18
Figure 12
Circuit
–
Alternate power source input from USB connector or
hub.
Connection to 10 µH inductor for internal step up
converter. Note: inductor must be rated for 400 mA
maximum peak current.
Intermediate output of main converter circuit. Requires
an external 4.7 µF low ESR filter capacitor to GND.
Ground.
When CS = 1, the control and signal pins are configured
normally. When CS is set low, CMDVCC%, RSTIN, and
CMDVCC# are latched. I/OUC, 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.
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 V
state and CS = 0 modes.
System controller data I/O to/from the card. Includes a
pull-up resistor to V
System controller auxiliary data I/O to/from the card.
Includes a pull-up resistor to V
System controller auxiliary data I/O to/from the card.
Includes a pull-up resistor to V
Logic low on one or both of these pins will cause the
LDO to ramp the Vcc supply to the smart card and
smart card interface to the value described in the
following table.
Note: See the description of the
more detail on the operation of CMDVCC% and
CMDVCC#.
Reset Input: This signal is the reset command to the
card.
Signal to controller indicating the 73S8009C is ready
because V
CMDVCC% and/or CMDVCC# is asserted low. A 20 kΩ
pull-up resistor to V
disabled in Power down state and CS=0 modes.
CMDVCC%
0
0
1
1
CC
is above the required value after
CMDVCC# Vcc Output Voltage
DD.
0
1
0
1
DD.
DD
Pull-up is disabled in Power down
Description
is provided internally. Pull-up is
1.8 V
5.0 V
3.0 V
LDO Off
DD.
DD.
Card Power Supply
DS_8009C_025
Rev. 1.5
for