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LTC4151 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4151 Datasheet(HTML) 7 Page - Linear Technology |
7 / 18 page LTC4151 7 4151ff For more information www.linear.com/LTC4151 block DiagraM operaTion The LTC4151 accurately monitors high side current and voltages. This device accepts a wide range of input volt- ages from as low as 7V up to 80V and consumes 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 differential voltagebetweenSENSE+(KelvinsenseofVIN)andSENSE– (full-scale 81.92mV) through an internal sense amplifier, theinputvoltageVIN(full-scale102.4V)throughaninternal 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 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 conversion is completed, the 12-bit digital code of the measured voltage is held in the corresponding data registers. The LTC4151 provides 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/LTC4151-2 provide separate data in (SDAI) and data out (SDAO on the LTC4151-1 and SDAO on the LTC4151-2) pins to facilitate opto-isolation. SHUTDOWN CONTROL 4151 BD 6.3V I2C/ REGISTERS DECODER SHDN (LTC4151) VIN 5µA 2k RS VREF = 2.048V SDA/SDAI (LTC4151/ LTC4151-1) ADR1 SCL SDAO/SDAO (LTC4151-1/ LTC4151-2) ADR0 GND ADIN 15k 735k INTERNAL POWER SENSE+ SENSE– – + 6V 12-BIT ADC MUX 25X 6V pin FuncTions SHDN (LTC4151 Only): Shutdown Input. Internally pulled up to 6.3V. Pull this pin below 1V to force the LTC4151 into shutdown mode. Leave this pin open if unused. VIN: Supply Voltage Input. Accepts 7V to 80V. The voltage at this pin is monitored by the onboard ADC with a full- scale input range of 102.4V. SENSE+ must be connected to VIN for proper ADC readout. |
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