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ADP1046A-100-EVALZ 데이터시트(PDF) 27 Page - Analog Devices |
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ADP1046A-100-EVALZ 데이터시트(HTML) 27 Page - Analog Devices |
27 / 88 page Data Sheet ADP1046A Rev. 0 | Page 27 of 88 POWER SUPPLY SYSTEM AND FAULT MONITORING The ADP1046A has extensive system and fault monitoring capabilities. The system monitoring functions include voltage, current, power, and temperature readings. The fault conditions include out-of-limit values for current, voltage, power, and temperature. The limits for the fault conditions are programmable. The ADP1046A has an extensive set of flags that are set when certain programmed thresholds or limits are exceeded. These thresholds and limits are described in the Fault Registers section. FLAGS The ADP1046A has an extensive set of flags that are set when certain limits, conditions, and thresholds are exceeded. The real-time status of these flags can be read in Register 0x00 to Register 0x03. The response to these flags is individually program- mable. Flags can be ignored or used to trigger actions such as turning off certain PWM outputs or the OrFET gate. Flags can also be used to turn off the power supply. The ADP1046A can be programmed to respond when these flags are reset. For more information, see the Fault Registers section. The ADP1046A also has a set of latched fault registers (Register 0x04 to Register 0x07). The latched fault registers have the same flags as Register 0x00 to Register 0x03, but the flags in the latched registers remain set so that intermittent faults can be detected. Reading a latched fault register resets all the flags in that register. MONITORING FUNCTIONS The ADP1046A monitors and reports several signals, including voltages, currents, power, and temperature. All these values are stored in separate registers and can be read through the I2C interface. For more information, see the Value Registers section. VOLTAGE READINGS The VS1, VS2, and VS3 ADCs have an input range of 1.6 V. The outputs of the ADCs are 12-bit values, which means that the LSB size is 1.6 V/4096 = 390.625 μV. The user is limited to an input range of 1.4 V, which means that the ADC output code is limited to 1.4 V/390.6 μV = 3584. The equation to calculate the ADC code at a specified voltage (Vx) at the pin is given by the following formula: ADC Code = Vx/1.6 × 4096 For example, when there is 1 V on the input of the ADC, ADC Code = 1 V/1.6 × 4096 ADC Code = 2560 In a 12 V application, the 12 V reading is divided down using a resistor divider network to provide 1 V at the sense pin. Therefore, to convert the register value to a real voltage, use the following formula: VOUT = (LSB × 2560) × ((R1 + R2)/R2) In a 12 V system, this equates to VOUT = (390.625 μV × 2560) × (11 kΩ + 1 kΩ)/1 kΩ CURRENT READINGS CS1 Pin CS1 has an input range of 1.4 V. The ADC performs a 12-bit reading conversion of this value, which means that the LSB size is 1.4 V/4096 = 341.8 μV. When there is exactly 1 V on the CS1 pin, the value in the CS1 value register (Register 0x13[15:4]) reads 2926. The equation to calculate the ADC code at a specified CS1 input voltage (Vx) is given by the following formula: ADC Code = Vx/1.4 × 4096 For example, when there is 1 V on the CS1 input pin, ADC Code = 1 V/1.4 × 4096 ADC Code = 2926 CS2+, CS2− Pins The full-scale (FS) range for the CS2 ADC can be set to 60 mV or 120 mV using Register 0x27[5]. The CS2 ADC has an input range of 120 mV. The resolution is 12 bits, which means that the LSB size is 120 mV/4096 = 29.30 μV. The user is limited to an input range of 110 mV. The equation to calculate the ADC code at a specified CS2 input voltage (VX) is given by the following formula: ADC Code = Vx/(120 mV) × 4096 For example, when there is 50 mV on the input of the ADC, ADC Code = 50 mV/120 mV × 4096 ADC Code = 1707 Therefore, to convert the CS2 register value to a real current, use the following formula: IOUT = (CS2_ADC_CODE/4096) × (FS/RSENSE) where: CS2_ADC_CODE is the value in Register 0x18[15:4]. FS is the full-scale voltage drop (60 mV or 120 mV). RSENSE is the sense resistor value. For example, if CS2_ADC_CODE = 1520, RSENSE = 10 mΩ, and FS = 120 mV, the real current is calculated as follows: IOUT = (1520/4096) × (120 mV/10 mΩ) IOUT = 4.453 A |
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