ISL9237 Datasheet, PDF (21/40 Pages) Intersil Corporation – Optional ASGATE FET control

ISL9237
After POR, the ACProchot# register is reset to 0x0C00H. The
ACProchot# register can be read back to verify its content.
If the adapter current exceeds the ACProchot# register setting,
PROCHOT# signal will assert after the debounce time programmed
by the Control2 register Bit<10:9> and latch on for a minimum time
programmed by Control2 register Bit<8:6>.
TABLE 9. ACProchot# REGISTER 0x47H (20mΩ SENSING RESISTOR,
128mA STEP, x18 GAIN)
BIT
DESCRIPTION
<6:0>
Not used
<7>
0 = Add 0mA of ACProchot# threshold.
1 = Add 128mA of ACProchot# threshold.
<8>
0 = Add 0mA of ACProchot# threshold.
1 = Add 256mA of ACProchot# threshold.
<9>
0 = Add 0mA of ACProchot# threshold.
1 = Add 512mA of ACProchot# threshold.
<10>
0 = Add 0mA of ACProchot# threshold.
1 = Add 1024mA of ACProchot# threshold.
<11>
0 = Add 0mA of ACProchot# threshold.
1 = Add 2048mA of ACProchot# threshold.
<12>
0 = Add 0mA of ACProchot# threshold.
1 = Add 4096mA of ACProchot# threshold.
<15:13> Not used
Maximum <12:7> = 110010, 6400mA
Setting PROCHOT# Threshold for Battery
Over Discharging Current Condition
To set the PROCHOT# signal assertion threshold for battery over
discharging current condition, write a 16-bit DCProchot#
command (0x48H or 0b01001000) using the Write-word protocol
shown in Figure 24 and the data format shown in Table 10. By
using the recommended current sense resistor values, the
register’s LSB always translates to 1mA of adapter current. The
DCProchot# register accepts any current command, however, only
the valid register bits will be written to the register and the
maximum value is clamped at 12.8A for R_s2 = 10mΩ.
After POR, the DCProchot# register is reset to 0x1000H. The
DCProchot# register can be read back to verify its content.
If the battery discharging current exceeds the DCProchot# register
setting, the PROCHOT# signal will assert after the debounce time
programmed by the Control2 register Bit<10:9> and latch on for a
minimum time programmed by Control2 register Bit<8:6>.
In battery only and Low Power mode, the DCProchot# threshold
is set by Control0 register Bit<4:3>.
In battery only mode, DCProchot# function works only when
PSYS is enabled, since enabling PSYS will activate the internal
comparator reference. The Information register Bit<15>
indicates if the internal comparator reference is active or not.
When adapter is present, the internal comparator reference is
always active.
TABLE 10. DCPROCHOT# REGISTER 0x48H (10mΩ SENSING
RESISTOR, 256mA STEP, x18 GAIN)
BIT
DESCRIPTION
<7:0>
Not used
<8>
0 = Add 0mA of DCProchot# threshold.
1 = Add 256mA of DCProchot# threshold.
<9>
0 = Add 0mA of DCProchot# threshold.
1 = Add 512mA of DCProchot# threshold.
<10>
0 = Add 0mA of DCProchot# threshold.
1 = Add 1024mA of DCProchot# threshold.
<11>
0 = Add 0mA of DCProchot# threshold.
1 = Add 2048mA of DCProchot# threshold.
<12>
0 = Add 0mA of DCProchot# threshold.
1 = Add 4096mA of DCProchot# threshold.
<13>
0 = Add 0mA of DCProchot# threshold.
1 = Add 8192mA of DCProchot# threshold.
<15:14> Not used
Maximum <13:8> = 110010, 12800mA
Setting PROCHOT# Debounce Time and
Duration Time
Control2 register Bit<10:9> configures the PROCHOT# signal
debounce time before its assertion for ACProchot# and
DCProchot#. The low system voltage Prochot# has a fixed
debounce time of 10µs.
Control2 register Bit<8:6> configures the minimum duration of
Prochot# signal once asserted.
Control Registers
Control0, Control1 and Control2 registers configure the operation of
the ISL9237. To change certain functions or options after POR, write
an 8-bit control command to Control0 register (0x39H or
0b00111001) or a 16-bit control command to Control1 register
(0x3CH or 0b00111100) or Control2 register (0x3DH or
0b00111101) using the Write-word protocol shown in Figure 24
and the data format shown in Tables 11, 12 and 13, respectively.
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FN8723.3
July 7, 2016