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LTC4151CDD-PBF Datasheet(PDF) 7 Page - Linear Technology |
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LTC4151CDD-PBF Datasheet(HTML) 7 Page - Linear Technology |
7 / 16 page 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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