FN8389 datasheet(36/56 Pages) RENESAS

36 / 56 page

ISL28023

FN8389 Rev.6.03

Page 36 of 55

Oct 27, 2022

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

value for the auxiliary VSHUNT channel.

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.

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 or external temperature of the chip. The

signed bit. The register value can be calculated using

Equation 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.

0XDA VOUT OV THRESHOLD SET (R/W)

The VOUT OV Threshold Set register is a read/writable word

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.

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.

(EQ. 13)

Vshunt_aux



(EQ. 14)

Vbus



(EQ. 15)

Bit_Val



























Bit_Val













FIGURE 100. SIMPLIFIED BLOCK DIAGRAM OF THE THRESHOLD

FUNCTIONS WITHIN THE DPM

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 00

11 1111

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