LTC4151IMS#PBF Linear Technology, LTC4151IMS#PBF Datasheet - Page 7

• Manufacturer Part Number: LTC4151IMS#PBF
• Description: IC CURRENT MONITOR(12BIT) 10MSOP
• Manufacturer: Linear Technology

Specifications of LTC4151IMS#PBF

• Function: Current Monitor (12 Bit)
• Sensing Method: High-Side
• Accuracy: ±1%
• Voltage - Input: 7 ~ 80 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• 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: MSOP
• Operating Temperature Classification: Industrial
• Operating Temp Range: -40C to 85C
• Pin Count: 10
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Lead Free Status / Rohs Status: Compliant

PIN FUNCTIONS
SHDN (LTC4151 Only): Shutdown Input. Internally pulled
up to 6.3V. Pull this pin below 1V to force the LTC4151 into
shutdown mode. Leave this pin open if unused.
BLOCK DIAGRAM
OPERATION
The LTC4151 accurately monitors high side current and
voltages. This device accepts a wide range of input volt-
ages from as low as 7V up to 80V and consumes less
than 1.7mA quiescent current in normal operation. A
shutdown mode is available with the LTC4151 to reduce
the quiescent current to less than 300µA by pulling the
SHDN pin below 1V.
In default continuous scan mode after power-up, the
onboard 12-bit analog-to-digital converter (ADC) continu-
ously and sequentially measures the high side differen-
tial voltage between SENSE
SENSE
amplifier, the input voltage V
an internal voltage divider, and the voltage applied to the
ADIN pin (full-scale 2.048V). The reference voltage of the
ADC is internally set to 2.048V. The digital data obtained
by the ADC is stored in the onboard registers.
–
(full-scale 81.92mV) through an internal sense
V
IN
735k
15k
GND
IN
INTERNAL
POWER
+
(full-scale 102.4V) through
(Kelvin sense of V
2k
+
SENSE
25X
R
S
+
ADIN
–
SENSE
MUX
–
IN
) and
6.3V
5µA
SHUTDOWN
CONTROL
V
at this pin is monitored by the onboard ADC with a full-
scale input range of 102.4V. SENSE
to V
12-BIT ADC
In snapshot mode, the LTC4151 can perform on-demand
measurement of a selected voltage without the need of
continuous polling by a master controller. The snapshot
mode is enabled by programming the control register
through the I
monitors the ADC’s conversion. When the conversion is
completed, the 12-bit digital code of the measured voltage
is held in the corresponding data registers.
The LTC4151 provides an I
from the data registers and to program the control register.
Two three-state pins, ADR0 and ADR1, are used to decode
nine device addresses (see Table 1). The LTC4151 features
a single SDA pin to handle both input data and output data,
while the LTC4151-1/LTC4151-2 provide separate data in
(SDAI) and data out (SDAO on the LTC4151-1 and SDAO
on the LTC4151-2) pins to facilitate opto-isolation.
IN
V
REF
: Supply Voltage Input. Accepts 7V to 80V. The voltage
SHDN
(LTC4151)
IN
= 2.048V
for proper ADC readout.
2
C interface. A status bit in the data register
REGISTERS
DECODER
ADR1
I
2
C/
ADR0
2
C interface to read the ADC data
6V
6V
SDAO/SDAO
(LTC4151-1/
LTC4151-2)
LTC4151-1)
SDA/SDAI
(LTC4151/
+
must be connected
SCL
4151 BD
LTC4151
4151fc
7