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LTC4151IMS-PBF Datasheet(PDF) 7 Page - Linear Technology

Part # LTC4151IMS-PBF
Description  High Voltage I2C Current and Voltage Monitor
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4151IMS-PBF Datasheet(HTML) 7 Page - Linear Technology

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LTC4151/LTC4151-1
7
41511fa
BLOCK DIAGRAM
OPERATION
The LTC4151/LTC4151-1 accurately monitor high side cur-
rent and voltages. These devices accept a wide range of
input voltages from as low as 7V up to 80V and consume
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+ (Kelvin sense of VIN) and
SENSE(full-scale 81.92mV) through an internal sense
amplifier, the input voltage VIN (full-scale 102.4V) through
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.
In snapshot mode, the LTC4151/LTC4151-1 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 I2C interface. A status bit in the data
register monitors the ADC’s conversion. When the conver-
sion is completed, the 12-bit digital code of the measured
voltage is held in the corresponding data registers.
The LTC4151/LTC4151-1 provide an I2C interface to read
the ADC data 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 provides
separate SDAI (input) and SDAO (inverted output) pins to
facilitate optoisolation.
SHUTDOWN
CONTROL
41511 BD
6.3V
I2C/
REGISTERS
DECODER
SHDN
(LTC4151)
VIN
5μA
VIN
RS
VREF = 2.048V
SDA/SDAI
(LTC4151/
LTC4151-1)
ADR1
SCL
SDAO
(LTC4151-1)
ADR0
GND
ADIN
15k
735k
INTERNAL
POWER
SENSE+
SENSE
+
1
2
10
8
3
4
8
7
9
5
6V
6
6V
12-BIT ADC
MUX
25X


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