Datasheet

LTC1955
18
1955fd
For more information www.linear.com/LTC1955
Figure 6. Multiple LTC1955s Daisychained Together
applicaTions inForMaTion
4-WIRE
COMMAND
INTERFACE
4-WIRE
CARD
INTERFACE
SMART CARD
VENDOR CARD
LTC1955
4.7µF
4.7µF
1µF
D
IN
D
OUT
SCLK
LD
DATA
R
IN
SYNC
ASYNC
CPO
INPUT
POWER
FAULT
V
BATT
GND
DV
CC
UNDERV
FAULT
PRES APRES BC
+
C
–
SMART CARD
VENDOR CARD
LTC1955
4.7µF
D
IN
D
OUT
SCLK
LD
DATA
R
IN
SYNC
ASYNC
CPO
V
BATT
GND
DV
CC
UNDERV
FAULT
VENDOR CARD
VENDOR CARD
1955 F07
LTC1955
4.7µF
D
IN
D
OUT
SCLK
LD
DATA
R
IN
SYNC
ASYNC
CPO
V
BATT
GND
DV
CC
UNDERV
FAULT
4.7µF
4.7µF
12, 13
9, 10
12, 13
9, 10
12, 13
9, 10
1
21 2
24
23
24
23
24
23
1
27
28
26
25
29
30
32
31
1
27
28
26
25
29
30
32
31
11 14
1µF
PRES APRES BC
+
C
–
21 211 14
1µF
PRES A
PRES BC
+
C
–
21 211 14
27
28
26
25
29
15
15
15
30
32
31