ISL28023 Datasheet, PDF (38/55 Pages) Intersil Corporation – Bidirectional current sensing

ISL28023
VSHUNT_THRES_RNG D[6]
The Vshunt_Thres_Rng bit sets the overvoltage threshold range
for the overcurrent DAC. The selectable V_SHUNT range improves
the overvoltage threshold resolution for lower full-scale current
applications. Table 29 defines the range settings for the V_BUS
threshold detector. The yellow shaded row denotes the default
setting.
TABLE 29. Vshunt_Thres_Rng BIT DEFINED
Vshunt_Thres_Rng: D[6]
0
V_SHUNT (RANGE)
80mV
1
40mV
VSHUNT_OC_SET D[5:0]
The Vshunt_OC_Set bits control the V_SHUNT voltage level to the
input of the OC comparator. The LSB of the DAC is 1.56% of the
full-scale range chosen using the Vshunt_Thres_Rng bits.
The overvoltage range starts at 25% of the full-scale range
chosen using Vbus_Thres_Rng bits and ends at 125% of the
chosen full-scale range.
TABLE 30. Vshunt_OC_Set BITS DEFINED
Vshunt_OC_Set: D[5:0]
OC THRESHOLD VALUE
00 0000
25% of FS
00 0001
(25 + 1.56)% of FS
TABLE 30. Vshunt_OC_Set BITS DEFINED
Vshunt_OC_Set: D[5:0]
OC THRESHOLD VALUE
00 0010
(25 + 3.12)% of FS
...............
....................
11 1101
(125 - 4.68)% of FS
11 1110
(125 - 3.12)% of FS
11 1111
(125 - 1.56)% of FS
SMB Alert
The DPM has two alert pins (SmbAlert1, SmbAlert2) to alert the
peripheral circuitry that a failed event has occurred. SmbAlert1
output is an open-drain allowing the user the flexibility to connect
the alert pin to other components requiring different logic
voltage levels than the DPM. The SmbAlert2 has a push/pull
output stage for driving pins with logic voltage levels equal to the
voltage applied to I2CVCC pin. The push/pull output is useful for
driving peripheral components that require the DPM to source
and sink a current. The alert pins are commonly connected to an
interrupt pin of a microcontroller or an enable pin of a device.
The SMB Alert registers control the functionality of the SMB Alert
pins. The threshold comparators are the inputs to the SMB Alert
registers. The outputs are the SMB Alert pins. Figure 101 on
page 38 is a simple functional block diagram of the SMB Alert
features.
FIGURE 101. SIMPLIFIED BLOCK DIAGRAM OF THE SMB ALERT FUNCTIONS WITHIN THE DPM
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FN8389.5
March 18, 2016