ISL9237EVAL2Z datasheet(21/40 Pages) INTERSIL

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ISL9237

FN8723.3

July 7, 2016

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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>.

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

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 Rs2 = 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.

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.

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

TABLE 10. DCPROCHOT# REGISTER 0x48H (10mΩ SENSING

RESISTOR, 256mA STEP, x18 GAIN)

BIT

DESCRIPTION

<7:0>

Not used

<8>