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LMP92064SDE データシート(PDF) 10 Page - Texas Instruments |
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LMP92064SDE データシート(HTML) 10 Page - Texas Instruments |
10 / 29 page 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 Submit Documentation Feedback Copyright © 2013–2014, Texas Instruments Incorporated Product Folder Links: LMP92064 |
同様の部品番号 - LMP92064SDE |
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同様の説明 - LMP92064SDE |
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