Datasheet

LTC1955
8
1955fd
For more information www.linear.com/LTC1955
block DiagraM
C4A
C8A
I/O A
RST A
V
CCB
CLK A
V
CCA
SV
BATT
DV
CC
PGND
CHARGE PUMP
FAULT
NC/NO
UNDERV
1.23V
SGND
PRES A
1955 BD
SMART
CARD
SOCKET B
SMART
CARD
SOCKET A
DIGITAL
SUPPLY
SMART
CARD
COMMUNICATIONS
SERIAL PORT
COMMAND/STATUS
DATA
C
+
C
–
CPO
+
–
RESET
CONTROL
LOGIC
STATUS DATA
COMMAND LATCH
SHIFT REGISTER
+
–
LDO A
τ
CLK B
RST B
I/O B
PRES B
D
IN
D
OUT
SCLK
LD
τ
LDO B
CLOCK
CONTROL
LOGIC
CHARGE
PUMP
DATA
ASYNC
SYNC
R
IN
25
26
28
27
30
32
31
29
21
19
18
20
17
24
9
1
23
22
2
6
7
3
4
5
8
14 11
10
12
PV
BATT
13 15