28023R12Z View Datasheet(PDF) - Intersil
Part Name
Description
Manufacturer
28023R12Z Datasheet PDF : 55 Pages
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ISL28023
0XE0 READ VSHUNT OUT AUX (R)
The Read VSHUNT Out Aux register is a readable word register
that stores the signed measured digital value of the auxiliary
VSHUNT input. Use Equation 2 to calculate the integer value of the
register, Equation 13 calculates the floating point measured
value for the auxiliary VSHUNT channel.
Vshunt_aux Register valuevshunt_aux LSB
(EQ. 13)
Vshunt_auxLSB is the numerical weight of each level for the
auxiliary VSHUNT channel. The Vshunt_auxLSB equals 2.5µV.
0XE1 READ VOUT AUX (R)
The Read VOUT Aux register is a readable word register that
stores the unsigned measured digital value of the auxiliary VBUS
input of the DPM. Using Equation 1 to calculate the integer value
of the register, Equation 14 calculates the floating point
measured value for the auxiliary VBUS channel.
Vbus Register valuevbus LSB
(EQ. 14)
VBUSLSB is the numerical weight of each level for the auxiliary
VBUS channel. The auxiliary VBUSLSB equals 100µV. The voltage
range for the auxiliary VBUS is 0 to VCC.
0X8D READ TEMPERATURE (R)
The read temperature register is a readable word register that
reports out the internal temperature of the chip. The register is a
16-bit signed register. Bit15 of the register is the signed bit. The
register value can be calculated using Equation 15.
Register Value
14
Bit_Valn2n
Bit_Val15215
n 0
(EQ. 15)
n is the bit position within the register value. Bit_Val is the value
of the bit either 1 or 0. The register value multiplied by 0.016
yields the internal temperature reading in Centigrade (°C).
Threshold Detectors
The DPM has three integrated comparators that allow for real
time fault detection of overvoltage, undervoltage for the primary
VBUS input and an overcurrent detection for the primary VSHUNT
input. An over-temperature detection is available by multiplexing
the input to the overvoltage comparator.
FIGURE 100. SIMPLIFIED BLOCK DIAGRAM OF THE THRESHOLD
FUNCTIONS WITHIN THE DPM
0XDA VOUT OV THRESHOLD SET (R/W)
The VOUT OV Threshold Set register is a read writable word
register that controls the threshold voltage level to the
overvoltage comparator. The description of the functionality
within this register is found in Table 22.
The compared reference voltage level to the OV comparator is
generated from a 6-bit DAC. The 6-bit DAC has 4 or 6 voltage
ranges to improve detection voltage resolution for a specific
voltage range.
TABLE 22. 0xDA VOUT OV THRESHOLD SET REGISTER DEFINITION
BIT NUMBER D[15:10] D[9]
D[8:6]
D[5:0]
Bit Name N/A OV_OT SEL Vbus_Thres_Ryng Vbus_OV_OT_Set
Default Value 0000 00 0
0 00
11 1111
OV_OT_SEL D[9]
The OV_OT_SEL bit configures the multiplexer to the input of the
OV comparator to either compare for over-temperature or
overvoltage. Setting the OV_OT_SEL to a 1 configures the OV
comparator to detect for an over-temperature condition.
VBUS_THRES_RNG D[8:6]
The Vbus_Thres_Rng bits sets the threshold voltage range for the
overvoltage and undervoltage DACs. There are 6 selectable
ranges for the 60V version of the DPM. Only 4 selectable ranges
for the 12V version of the DPM. Table 23 defines the range
settings for the VBUS threshold detector. The yellow shaded row
denotes the default setting.
Submit Document Feedback 36
FN8389.4
June 17, 2015
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