ISL78229 Datasheet, PDF (55/71 Pages) Intersil Corporation – 2-Phase Boost Controller with Drivers

ISL78229
READ_TEMPERATURE (8Dh)
Definition: This command returns temperature information with value of the NTC pin voltage (V_NTC), which represents the temperature of
the board spot where the NTC resistor is placed (refer to “External Temperature Monitoring and Protection (NTC Pin)” on page 38).
The READ_TEMPERATURE 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 VNTC voltage value with 2mV/LSB.
Equation 30 can be used to convert the 16Lu data (Bits [9:0] unsigned binary integer value, termed as COMMAND) reported in this
command to V_NTC:
V_NTC = 0.002  COMMAND
(EQ. 30)
To convert the V_NTC voltage to temperature, refer to the specific V_NTC versus temperature characteristic curve (example Figure 71 on
page 38) for each specific application setup.
Data Length in Bytes: 2
Data Format: 16Lu
Type: Read Only
Protectable: N/A
Default Value: N/A
Units: Volts (referred for V_NTC with 2mV/LSB)
Equation: Equation 30 to calculate V_NTC. Use the specific V_NTC versus temperature characteristic curve such as Figure 71 on page 38
for the specific setup to convert _NTC to temperature.
Range: 0 to 2.046V (referred for V_NTC with 2mV/LSB)
Example: READ_TEMPERATURE = 00E1h = 225(decimal), with 2mV/LSB, use Equation 30 to get V_NTC = 225 * 2mV = 450mV.
If V_NTC versus temperature characteristic curve is Figure 71 on page 38, the temperature is around 102°C reading from the figure.
COMMAND
READ_TEMPERATURE (8Dh)
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 temperature information with value of the NTC pin voltage and with 2mV/LSB. Use Equation 30 to
calculate the NTC pin voltage V_NTC. Use the specific V_NTC versus temperature characteristic curve to convert VNTC to
temperature.
Not used
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FN8656.3
February 12, 2016