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LTC4151IDD-PBF Datasheet(PDF) 8 Page - Linear Technology |
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LTC4151IDD-PBF Datasheet(HTML) 8 Page - Linear Technology |
8 / 16 page LTC4151/LTC4151-1 8 41511fa APPLICATIONS INFORMATION The LTC4151/LTC4151-1 offer a compact complete solu- tion for high side power monitoring. With a wide operating voltage range from 7V to 80V, these devices are ideal for a variety of applications including consumer, automotive, industrial and telecom infrastructure. The simple applica- tion circuit as shown in Figure 1 provides monitoring of high side current with a 0.02 Ω resistor (4.096A in full- scale), input voltage (102.4V in full-scale) and an external voltage (2.048V in full-scale), all with an internal 12-bit resolution ADC. Data Converter The LTC4151/LTC4151-1 feature an onboard, 12-bit analog- to-digital converter (ADC) that continuously monitors three voltages in the sequence of (VSENSE+ – VSENSE–) first, VIN second and VADIN third. The differential voltage between SENSE+ and SENSE– is monitored with an 81.92mV full- scale and 20μV resolution that allows accurate measure- ment of the high side input current. SENSE+ is a Kelvin sense pin for the VIN pin and must be connected to VIN (see Figure 10) for proper ADC readout. The supply volt- age at VIN is directly measured with a 102.4V full-scale and 25mV resolution. The voltage at the uncommitted ADIN pin is measured with a 2.048V full-scale and 0.5mV resolution that allows monitoring of any external voltage. Figure 1. Monitoring High Side Current and Voltages Using the LTC4151 The 12-bit digital code of each measured voltage is stored in two adjacent registers out of the six total data registers A through F, with the eight MSBs in the first register and the four LSBs in the second (Table 2). The data in registers A through F is refreshed at a frequency of 7.5Hz in continuous scan mode. Setting control register bit G4 (Table 6) invokes a test mode that halts updating of these registers so that they can be written to and read from for software testing. The data converter features a snapshot mode allowing us- ers to make one-time measurements of a selected voltage (either the SENSE voltage, VIN voltage, or ADIN voltage). To enable snapshot mode, set control register bit G7 and write the two-bit code of the desired ADC channel to G6 and G5 (Table 6) using a Write Byte command. When the Write Byte command is completed, the ADC measures the selected voltage and a Busy Bit in the LSB data register is set to indicate that the data is not ready. After complet- ing the conversion, the ADC is halted and the Busy Bit is reset to indicate that the data is ready. To make another measurement of the same voltage or to measure another voltage, first disable the snapshot mode for the previous measurement by clearing control bit G7, then re-enable the snapshot mode and write the code of the desired voltage according to the procedure described above. 41511 F01 0.02Ω μ-Controller LTC4151 SHDN VIN 7V TO 80V VIN VDD VADIN 2 3 4 SCL SDA ADIN ADR1 SCL 8 110 6 7 5 9 SDA ADR0 GND SENSE+ SENSE– 3.3V VOUT 2k 2k |
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