73S8009C Maxim, 73S8009C Datasheet - Page 17

• 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

DS_8009C_025
Rev. 1.5
NOTES:
1) VBUS = 4.5V to 5.5V DC.
2) VPC = 2.7V to 6.5V DC (should only be used when V
3) VBAT = 4.0V to 6.5V DC.
4) Internal pull-up allows it to be left open if unused.
5) Resistor footpring is included in case some filtering is needed on CLK
6) Capacitors C4 and C5 are provisional and their footprints should be added
7) Inductor must be rated for 400 mA maximum peak current.
8) V
V
for added noise rejection if necessary.
DD
BUS
AUX1UC_to/from_uC
AUX2UC_to/from_uC
OFF_interrupt_to_uC
CMDVCC%_from_uC
CMDVCC#_from_uC
- 3.3V, +/- 0.3V, 40mA max. Requires min two 0.1µF caps to gnd)
VDD_supply_to_uC
OFF_ACK_from_uC
RDY_status_to_uC
are unused)
I/OUC_to/from_uC
OFF_REQ_to_uC
RSTIN_from_uC
CLKIN_from_uC
See NOTE 8
CS_from_uC
Figure 3: Typical 73S8009C Application Schematic
BAT
73S80009C
and
VDD
1
2
3
4
5
6
7
8
I/OUC
AUX1UC
AUX2UC
CMDVCC%
CMDVCC#
RSTIN
CLKIN
RDY
See NOTE 7
NOTE 4
See
10µH
4.7µF
C2
VP
C
See NOTE 2
See NOTE 3
ON/OFF
VDD
VBAT
VBUS
AUX1
AUX2
GND
32 QFN
VCC
RST
Card detection
switch is
normally closed
I/O
19
18
24
23
22
21
20
17
See NOTE 1
20K
R2
10µF
C3
VBUS
NOTE 5
0
See
Smart Card Connector
Pushbutton Switch
C6
0.1µF
SW1
27pF
27pF
C5
C4
CLK track should be routed
far from RST, I/O, C4 and C8
NOTE 6
NOTE 6
0.47µF,
C1
See
See
73S8009C Data Sheet
Low ESR (<100 M? )
should be placed near the
SC connecter contact
17