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LMP92064SDE データシート(PDF) 10 Page - Texas Instruments

部品番号 LMP92064SDE
部品情報  Precision Low-Side, 125-kSps Simultaneous Sampling, Current Sensor and Voltage Monitor With SPI
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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LMP92064SDE データシート(HTML) 10 Page - Texas Instruments

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LMP92064
DIGITAL
CONTROL
CSB
SCLK
VDD
INVG
INVP
SDI
SDO
GND
VDIG
REFC
REFG
DGND
VREF
2.048V
INCN
INCP
ADC
12-bit
RESET
+
-
ADC
12-bit
CSA
Av=25
+
-
Buffer
Av=1
LMP92064
SNOSCX0A – JUNE 2013 – REVISED DECEMBER 2014
www.ti.com
7 Detailed Description
7.1 Overview
The LMP92064 is a precision low-side digital current sensor and voltage monitor with a digital SPI interface. The
analog front-end includes a precision current sense amplifier to measure a load current across a shunt resistor
and abuffered voltage channel to measure the voltage supply of the load.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Current Sense Input Channel
The current sensing channel of the LMP92064 has a high impedance differential amplifier followed by a 12-bit
analog-to-digital converter. The binary code result of a conversion is stored as a right-justified 16-bit number as
shown in Table 1, where the 4 most significant bits are always 0. Due to an offset auto-calibration feature of the
current sense channel path, the top 256 codes are clipped at code 3840, denoted by the trailing zeros found in
the equivalent binary code of the maximum positive input voltage.
The output data of the current sense channel is accessible on registers 0x0203 and 0x0202.
Table 1. Ideal Current Channel Input Voltages and Output Codes
DESCRIPTION
ANALOG VALUE
DIGITAL OUTPUT
Full scale range
V FS= 81.92 mV
BINARY CODE
HEX CODE
[B15:B0]
Least significant bit (LSB)
VFS / 4096
Maximum Positive Input
VFS – 256 LSB
0000 1111 0000 0000
0x0F00
Voltage
Zero
0 V
0000 0000 0000 0000
0x0000
10
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Product Folder Links: LMP92064


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