ISL78229 Datasheet, PDF (51/71 Pages) Intersil Corporation – 2-Phase Boost Controller with Drivers

ISL78229
OT_NTC_WARN_LIMIT (51h)
Definition: Set/Read the voltage threshold for the external over-temperature warning (OT_NTC_WARN). As described in “External
Temperature Monitoring and Protection (NTC Pin)” on page 38, the NTC pin voltage represents the temperature of the board (Figure 71 on
page 38). The ISL78229 compares the NTC pin voltage V_NTC to a voltage threshold which is set by this OT_NTC_WARN_LIMIT command
to detect if OT_NTC_WARN occurs.
The OT_NTC_WARN_LIMIT command has two data bytes formatted as 16Lu (“Write/Read the 16Lu Data to Set NTC Threshold” on
page 42). Bits [15:10] are not used and Bits [9:0] unsigned binary integer value represents the voltage threshold for V_NTC with
2mV/LSB. The OT_NTC_WARN_LIMIT has default setting of 00E1h meaning 450mV threshold for V_NTC.
When V_NTC is lower than 450mV (default), the OT_NTC_WARN warning event is triggered. For detailed descriptions of this warning, refer
to “External Over-Temperature Warning (OT_NTC_WARN)” on page 38.
To convert the voltage threshold for to temperature threshold, 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: R/W
Protectable: Yes
Default Value: 00E1h. With 00E1h = 225(decimal) and 2mV/LSB, the OT_NTC_WARN default threshold for V_NTC is
225 * 2mV = 450mV.
Units: mV (referred for voltage threshold for V_NTC with 2mV/LSB)
Equation: V_{OT_NTC_WARN_LIMIT} = 0.002 * OT_NTC_WARN_LIMIT as Equation 23 on page 42, where OT_NTC_WARN_LIMIT is the 16Lu
data in this command, and V_{OT_NTC_WARN_LIMIT} refers to the OT_NTC_WARN threshold for V_NTC
Range: 0 to 2.046V (referred for voltage threshold for V_NTC with 2mV/LSB)
COMMAND
OT_NTC_WARN_LIMIT (51h)
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
0000000011100001
BIT NUMBER
9:0
15:10
MEANING
Set/Read the voltage threshold for V_NTC as OT_NTC_WARN warning detection with 2mV/LSB
Not used
Submit Document Feedback ₅₁
FN8656.3
February 12, 2016