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ADP1046AW Datasheet(PDF) 27 Page - Analog Devices

Part No. ADP1046AW
Description  Digital Controller for Isolated
Download  88 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADP1046AW Datasheet(HTML) 27 Page - Analog Devices

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Data Sheet
ADP1046AW
Rev. 0 | Page 27 of 88
POWER SUPPLY SYSTEM AND FAULT MONITORING
The ADP1046AW 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 ADP1046AW 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 ADP1046AW 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 ADP1046AW can
be programmed to respond when these flags are reset. For more
information, see the Fault Registers section.
The ADP1046AW 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 ADP1046AW monitors and reports several signals, includ-
ing 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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