AN1978 STMicroelectronics, AN1978 Datasheet - Page 7

• Manufacturer Part Number: AN1978
• Description: ST8004: SMART CARD INTERFACE
• Manufacturer: STMicroelectronics

Figure 8: Vcc loaded with a 65mA pulsed current.
Figure 9: Step-up and Vcc capacitors placement.
VUP wire
VUP wire
VUP wire
Card
Card
Card
connector
connector
connector
V
V
V
DDP
DDP
DDP
wire
wire
wire
C8 (AUX2)
C8 (AUX2)
C8 (AUX2)
C5(GND)
C5(GND)
C5(GND)
C6 (N.C.)
C6 (N.C.)
C6 (N.C.)
C7 (I/O)
C7 (I/O)
C7 (I/O)
Vcc
Vcc
Vcc
V
V
V
PGND
PGND
PGND
S2
S2
S2
V
V
V
S1
S1
S1
UP
UP
UP
DDP
DDP
DDP
PRES and PRES
PRES and PRES
PRES and PRES
Vcc
Vcc
Vcc
CH1: Vcc voltage; offset=5V;
BandWidth=250MHz.
CH4: Vcc output current into
GND.
Conditions:
VDD=3.3V;
The Vcc voltage is between
4.6V and 5.3V even if a 65mA
sink pulsed current is forced.
VDDP=4.75V;
5/3V=H.
AN1978 - APPLICATION NOTE
C4 (AUX1)
C4 (AUX1)
C4 (AUX1)
C3 (CLK)
C3 (CLK)
C3 (CLK)
C2 (RST)
C2 (RST)
C2 (RST)
C1 (Vcc)
C1 (Vcc)
C1 (Vcc)
C1 (Vcc)
C1 (Vcc)
C1 (Vcc)
Card
Card
Card
connector
connector
connector
C11:
C11:
C11:
100nF filter
100nF filter
100nF filter
capacitor
capacitor
capacitor
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