ltc1555l-1.8 Linear Technology Corporation, ltc1555l-1.8 Datasheet - Page 5

• Manufacturer Part Number: ltc1555l-1.8
• Description: Sim Power Supply And Level Translator
• Manufacturer: Linear Technology Corporation

PIN
BLOCK DIAGRA
M2 (Pin 6): Mode Control Bit 2 (see Table 1). (Pin 6 was
previously used for soft-start control on the LTC1555.)
M1 (Pin 7): Mode Control Bit 1 (see Table 1).
M0 (Pin 8): Mode Control Bit 0 (see Table 1).
GND (Pin 9): Ground for Both the SIM and the Controller.
Should be connected to the SIM GND contact as well as to
the V
bypassing is required to meet 10kV ESD specifications.
C1
C1
Table 1. Truth Table
–
+
U
DV
DV
DV
(Pin 10): Charge Pump Flying Capacitor Negative Input.
(Pin 11): Charge Pump Flying Capacitor Positive Input.
M0
0V
0V
IN
CC
CC
CC
FUNCTIONS
/controller GND. Proper grounding and supply
U
DV
DV
M1
0V
0V
0V
CC
CC
CONTROLLER
U
0V or DV
0V or DV
0V or DV
DV
V
M2
0V
W
CC
CC
CC
CC
CC
OPTIONAL
V
1.8V
BATT
Shutdown (V
OPERATING MODE
C
1 F
IN
V
V
M0
M1
M2
DV
RIN
CIN
DATA
DDRV
V
V
V
CC
IN
CC
CC
CC
CC
= 1.8V
= V
= 3V
= 5V
1 A
CC
IN
= 0V)
20k
CHARGE PUMP
STEP-DOWN
CONVERTER
STEP-UP/
DC/DC
C1
UVLO
0.1 F
+
V
and 6V. There is no power-up sequencing requirement for
V
V
to the SIM V
mined by the M0-M2 pins (see Table 1). V
to GND during shutdown (M0, M1 = 0V). A 2.2 F low ESR
ouptut capacitor should connect close to the V
I/O (Pin 14): SIM Side I/O Pin. The pin is an open drain
output with a nominal pull-up resistance of 10k
should be connected to the SIM I/O contact. The SIM card
must sink up to 1mA max when driving the I/O pin low due
to the internal pull-up resistors on the I/O and DATA pins.
The I/O pin is held active low during shutdown.
RST (Pin 15): Level Shifted Reset Output Pin. Should be
connected to the SIM RST contact.
CLK (Pin 16): Level Shifted Clock Output Pin. Should be
connected to the SIM CLK contact. Careful trace routing is
recommended due to fast rise and fall edge speeds.
IN
IN
CC
C1
(Pin 12): Charge Pump Input Pin. May be between 2.6V
with respect to DV
–
(Pin 13): SIM Card V
10k
LTC1555L-1.8
GND
V
RST
CLK
CC
I/O
CC
contact. The V
CC
C
2.2 F
OUT
.
CC
Output. Should be connected
V
RST
CLK
I/O
GND
CC
LTC1555L-1.8
CC
SIM
output voltage is deter-
1555L BD
CC
is discharged
CC
pin.
5
and