ISL78229 Datasheet, PDF (52/71 Pages) Intersil Corporation – 2-Phase Boost Controller with Drivers

ISL78229
READ_VIN (88h)
Definition: This command returns a voltage reading with value of VIN/48 (VIN pin voltage divided by 48).
The READ_VIN 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
VIN/48 voltage value with 2mV/LSB. According to Equation 21 on page 42, Equation 25 can be used to convert the 16Lu data
(Bits [9:0] unsigned binary integer value, termed as COMMAND) in this command to input voltage at the VIN pin:
V_IN = 48  0.002  COMMAND
(EQ. 25)
Data Length in Bytes: 2
Data Format: 16Lu
Type: Read Only
Protectable: N/A
Default Value: N/A
Units: Volts (referred for VIN/48 with 2mV/LSB, use Equation 25 get V_OUT)
Equation: Equation 25
Range: 0 to 2.046V (referred for VIN/48 with 2mV/LSB)
Example: READ_VIN = 007Dh = 125(decimal), with 2mV/LSB and Equation 25, V_IN = 48 * 0.002 * 125 = 12V
COMMAND
READ_VIN (88h)
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 input voltage with value of VIN/48 with 2mV/LSB. Use Equation 25 calculate the V_IN.
Not used
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FN8656.3
February 12, 2016