LTC4151CS-2#PBF Linear Technology, LTC4151CS-2#PBF Datasheet - Page 10

• Manufacturer Part Number: LTC4151CS-2#PBF
• Description: IC CURRENT MONITOR(12BIT) 16SOIC
• Manufacturer: Linear Technology

Specifications of LTC4151CS-2#PBF

• Function: Current Monitor (12 Bit)
• Sensing Method: High-Side
• Accuracy: ±1%
• Voltage - Input: 7 ~ 80 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Voltage Supervisor Type: Voltage Monitor
• Number Of Voltage Supervisors: 1
• Reset Threshold Voltage (min): 2.3V
• Reset Threshold Voltage (max): 2.9V
• Operating Supply Voltage (min): 7V
• Operating Supply Voltage (max): 80V
• Package Type: SO
• Operating Temperature Classification: Commercial
• Operating Temp Range: 0C to 70C
• Pin Count: 16
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Lead Free Status / Rohs Status: Compliant

LTC4151
APPLICATIONS INFORMATION
Using Opto-Isolators with LTC4151-1 and LTC4151-2
The LTC4151-1/LTC4151-2 split the SDA line into SDAI
(input) and SDAO (LTC4151-1 inverted output) or SDAO
(LTC4151-2 output) for convenience of opto-coupling with
a host controller that sits at a different ground level.
When using opto-isolators with the LTC4151-1, connect
the SDAI to the output of the incoming opto-coupler and
connect the SDAO to the anode of the outgoing opto-
coupler (see Figure 9). With the outgoing opto-coupler
clamping SDAO and internal 6V (5.5V minimum) clamps
on SDAI and SCL, the pull-up resistors on these three pins
can be directly connected to V
rather than conventional SDAO), the need for a separate
low voltage supply for pull-ups is eliminated.
Figure 11 shows the LTC4151-2 with high speed opto-
couplers for faster bus speeds. The LTC4151-2 has a non-
inverter SDAO output. Powered from V
LT3010-5 low dropout regulator provides the supply for the
opto-couplers as well as the bus lines pull-up. If the SDAI
and SDAO on the master controller are not tied together,
the ACK bit of the SDAO must be returned back to SDAI.
10
48V
V
IN
V
ADR1
ADR0
IN
SENSE
Figure 9. Opto-Isolation of the I
Microcontroller (Data Rate of I
LTC4151-1
0.02
GND
+
R
S
IN
SENSE
. In this way (with SDAO
SDA0
ADIN
SDAI
–
SCL
IN
, the high voltage
R1
20k
V
ADIN
R2
20k
2
2
C is Limited by Slew Rate of Opto-Isolators)
R3
5.1k
C Interface Between LTC4151-1 and a
8
7
6
5
1
2
3
4
Start and Stop Conditions
When the I
in the high state. A bus master signals the beginning of a
transmission with a Start condition by transitioning SDA
from high to low while SCL stays high. When the master
has finished communicating with the slave, it issues a
Stop condition by transitioning SDA from low to high
while SCL stays high. The bus is then free for another
transmission.
Stuck-Bus Reset
The LTC4151 I
The low conditions of the SCL and the SDA/SDAI pins
are OR’ed to start the timer. The timer is reset when both
SCL and SDA/SDAI are pulled high. If the SCL pin or the
SDA/SDAI pin is held low for over 33ms, the stuck-bus
timer will expire and the internal I
reset to allow normal communication after the stuck-bus
condition is cleared. The stuck-bus timer can be disabled
by clearing control register bit G2.
MOCD207M
MOCD207M
2
C bus is idle, both SCL and SDA must remain
1
2
3
4
8
7
6
5
2
C interface features a stuck-bus reset timer.
R4
0.51k
R5
0.51k
R6
10k
R7
10k
2
C state machine will be
SCL
SDA
µ-CONTROLLER
3.3V
V
DD
4151 F09
4151fc