ADP1043A Analog Devices, ADP1043A Datasheet - Page 39

• Manufacturer Part Number: ADP1043A
• Description: Digital Controller for Isolated Power Supply Applications
• Manufacturer: Analog Devices

Table 20. Register 0x15—VS1 Voltage Value
Bits
[15:4]
[3:0]
Table 21. Register 0x16—VS2 Voltage Value
Bits
[15:4]
[3:0]
Table 22. Register 0x17—VS3 Voltage Value (Output Voltage)
Bits
[15:4]
[3:0]
Table 23. Register 0x18—CS2 Value (Output Current)
Bits
[15:4]
[3:0]
Name
Reserved
Name
Reserved
Name
Reserved
Name
Reserved
VS1 voltage value
VS2 voltage value
VS3 voltage value
Output current value
R/W
R
R
R/W
R
R
R/W
R
R
R/W
R
R
Description
This register contains the 12-bit local output voltage information. This voltage is measured at
the VS1 pin. To read the VS1 voltage information, this register must be read using two consecu-
tive read operations. The eight bits of the first read return the eight MSBs of the local output
voltage information. The top four bits of the second read return the four LSBs of the local
output voltage information. The range of the VS1 input pin is from 0 V to 1.55 V. This value
has 12 bits of resolution, which results in an LSB size of 378 μV. At 0 V input, the value in this
register is 0 (0x000). At 1.5 V input, the ADC output is 3964 (0xF7C). The recommended
nominal voltage at this pin is 1 V. At 1 V input, the value in this register is 2643 (0xA53).
Reserved.
Description
This register contains the 12-bit load output voltage information. This voltage is measured at
the VS2 pin. To read the load VS2 voltage information, this register must be read using two
consecutive read operations. The eight bits of the first read return the eight MSBs of the load
output voltage information. The top four bits of the second read return the four LSBs of the
load output voltage information. The range of the VS2 input pin is from 0 V to 1.55 V. This value
has 12 bits of resolution, which results in an LSB size of 378 μV. At 0 V input, the value in this
register is 0 (0x000). At 1.5 V input, the ADC output is 3964 (0xF7C). The recommended
nominal voltage at this pin is 1 V. At 1 V input, the value in this register is 2643 (0xA53).
Reserved.
Description
This register contains the 12-bit remote output voltage information. This value is the differential
voltage between the VS3+ and VS3− pins. To read the remote output voltage information,
this register must be read using two consecutive read operations. The eight bits of the first
read return the eight MSBs of the remote output voltage information. The top four bits of
the second read return the four LSBs of the remote output voltage information. The range of
the VS3 input pin is from 0 V to 1.55 V. This value has 12 bits of resolution, which results in an
LSB size of 378 μV. At 0 V input, the value in this register is 0 (0x000). At 1.5 V input, the ADC
output is 3964 (0xF7C). The recommended nominal voltage at this pin is 1 V. At 1 V input, the
value in this register is 2643 (0xA53).
Reserved.
Description
This register contains the 12-bit output current information. This information is the voltage
drop across the sense resistor. The user must divide this value by the sense resistor value to
obtain the current value. To read the output current information, this register must be read
using two consecutive read operations. The eight bits of the first read return the eight MSBs
of the output current information. The top four bits of the second read return the four LSBs
of the output current information. The CS2 pin has an input range of 250 mV. This value has
12 bits of resolution, which results in an LSB size of 61.04 μV. The nominal voltage setting in
Bits[7:6] of Register 0x23 changes this LSB step size.
If the nominal voltage range is from 75 mV to 150 mV, the LSB step size is 61.04 μV.
At a 30 mV input signal on CS2, the value in this register is 30 mV/61.04 μV = 491 (0x1EB).
If the nominal voltage range is from 37.5 mV to 75 mV, the LSB step size is 30.52 μV.
At a 30 mV input signal on CS2, the value in this register is 30 mV/30.52 μV = 982 (0x3D6).
If the nominal voltage range is from 0 mV to 37.5 mV, the LSB step size is 15.26 μV.
At a 30 mV input signal on CS2, the value in this register is 30 mV/15.26 μV = 1966 (0x7AE).
Reserved.
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ADP1043A