ISL78229 Datasheet, PDF (54/71 Pages) Intersil Corporation – 2-Phase Boost Controller with Drivers

ISL78229
READ_IIN (8Ch)
Definition: This command returns input current information with value of the IMON pin voltage (V_IMON) which represents the 2-phase
boost total input average current I_IN as described in “Average Current Sense for 2 Phases - IMON” on page 32.
The READ_IIN command has two data bytes formatted as 16Lu (refer to “Read the 16Lu Data to Report the 10-Bit ADC Input Voltage” on
page 42), where the Bits [15:10] are not used and Bits [9:0] are used. The Bits [9:0] unsigned binary integer value represents the IMON
voltage value with 2mV/LSB.
Equation 28 can be used to convert the 16Lu data (Bits [9:0] unsigned binary integer value, termed as COMMAND) reported in this
command to V_IMON:
V_IMON = 0.002  COMMAND
(EQ. 28)
According to Equations 13 and 14, Equation 29 can be used to convert the 16Lu data (Bits [9:0] unsigned binary integer value, termed
as COMMAND) reported in this command to the total 2-phase current value as the boost input current I_IN, where R_SEN, R_SET and R_IMON
are described in “Current Sense” on page 31:
I_IN = ^---^{C----------O----------M------------M----R------A--I----M----N------O---D}-----^{N-------------0}-------^.---0-------^{0R------2----}_S---–-_E---¹-_N---⁷-----^---¹---⁰----^–--⁶---^-----^---⁸----^---^R-----^S----^E----^T-
(EQ. 29)
Data Length in Bytes: 2
Data Format: 16Lu
Type: Read Only
Protectable: N/A
Default Value: N/A
Units: Volts (referred for V_IMON with 2mV/LSB. Use Equation 29 get I_IN, which has unit “A”)
Equation: Equation 28 to calculate V_IMON and Equation 29 to calculate I_IN
Range: 0 to 2.046V (referred for V_IMON with 2mV/LSB)
Example: READ_IIN = 0800h = 800(decimal).
Use Equation 28 to get V_IMON = 0.002 * 800 = 1.6V.
With R_SEN = 1mΩ, R_SET = 483.1Ω and R_IMON = 57.6kΩ, use Equation 29 to get I_IN = 41.65A.
COMMAND
READ_IIN (8Ch)
Format
16Lu
Bit Position
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Access
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Function
See Following Table
Default Value
N/A
BIT NUMBER
9:0
15:10
MEANING
Reports the total 2-phase boost input average current information with value of the IMON pin voltage with 2mV/LSB.
Use Equation 28 to calculate V_IMON, and Equation 29 to calculate the total 2-phase boost input average current I_IN.
Not used
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FN8656.3
February 12, 2016