ZL9101M_15 Datasheet, PDF (51/67 Pages) Intersil Corporation – Digital DC/DC PMBus 12A Module

ZL9101M
OVUV_CONFIG (D8h)
Definition: Configures the output voltage OV and UV fault detection feature. The default value of 00h is recommended.
Data Length in Bytes: 1
Data Format: Bit
Type: R/W Byte
Default Value: 00h (One violation trigger V_OUT fault, OV fault does not enable low-side power device)
Units: N/A
BITS
PURPOSE
Controls How an OV Fault Response Shutdown Sets the Output
7 _{Driver State}
6:4 Not Used
3:0 Defines the Number of Consecutive Limit Violations Required
to Declare an OV or UV Fault
VALUE
0
1
0
N
DESCRIPTION
An OV fault does not enable low-side power device
An OV fault enables the low-side power device
Not used
N+1 consecutive OV or UV violations initiate a fault response
TEMPCO_CONFIG (DCh)
Definition: Configures the correction factor and temperature measurement source when performing temperature coefficient correction
for current sense. TEMPCO_CONFIG values are applied as negative correction to a positive temperature coefficient.
Data Length in Bytes: 1
Data Format: CUS
Type: R/W Byte
Protectable: Yes
Default Value: 2Ch (4400ppm/°C)
Equation: To determine the hex value of the Tempco Correction factor (TC) for current scale of a power stage current sensing, first
determine the temperature coefficient of resistance for the sensing element, α. This is found with Equation 10:


R_REF 
R_REF (T_REF
R
T)
(EQ. 10)
Where:
R = Sensing element resistance at temperature “T”
R_REF = Sensing element resistance at reference temperature T_REF
α = Temperature coefficient of resistance for the sensing element material
T = Temperature measured by temperature sensor, in °C
T_REF = Reference temperature that α is specified at for the sensing element material
After α is determined, convert the value in units of 100ppm/°C. This value is then converted to a hex value with Equation 11:
TC

 10⁶
100
(EQ. 11)
Typical Values: Copper = 3900ppm/°C (27h), silicon = 4800ppm/°C (30h)
Range: 0 to 6300ppm/°C
BITS
PURPOSE
VALUE
DESCRIPTION
7 Selects the Temp Sensor Source for Tempco Correction 0 Selects the internal temperature sensor
6:0
Sets the Tempco Correction in Units of 100ppm/˚C for
IOUT_CAL_GAIN
TC
RSEN (DCR) = IOUT_CAL_GAIN x (1+TC x (T-25))
where RSEN = resistance of sense element
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FN7669.5
February 12, 2015