ISL88731CHRTZ-T Intersil, ISL88731CHRTZ-T Datasheet - Page 15

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ISL88731CHRTZ-T

Manufacturer Part Number
ISL88731CHRTZ-T
Description
IC BATT CHRGR SMBUS LVL2 28TQFN
Manufacturer
Intersil
Datasheet

Specifications of ISL88731CHRTZ-T

Function
Charge Management
Battery Type
Lithium-Ion (Li-Ion)
Voltage - Supply
8 V ~ 26 V
Operating Temperature
-10°C ~ 100°C
Mounting Type
Surface Mount
Package / Case
28-WFQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Setting Charge Current
ISL88731C has a 16-bit ChargeCurrent register that sets the
battery charging current. ISL88731C controls the charge current
by controlling the CSOP-CSON voltage. The register’s LSB
translates to 10µV at CSON-CSOP. With a 10mΩ charge current
R
the LSB translates to 1mA charge current. The ISL88731C
ignores the first 7 LSBs and uses the next 6 bits to control the
current DAC. The charge-current range of the ISL88731C is 0A to
8.064A (using a 10mΩ current-sense resistor). All numbers
requesting charge current above 8.064A result in a current
setting of 8.064A. All numbers requesting charge current
between 0mA to 128mA result in a current setting of 0mA. The
default charge current setting at Power-On Reset (POR) is 0mA.
To stop charging, set ChargeCurrent to 0. Upon initial power up,
the ChargeVoltage and ChargeCurrent registers are reset to 0
sense
BIT
10
11
12
13
14
15
resistor (RS2 in ”Typical Application Circuit” on page 2),
0
1
2
3
4
5
6
7
8
9
Charge Current, DACI 0
Charge Current, DACI 1
Charge Current, DACI 2
Charge Current, DACI 3
Charge Current, DACI 4
Charge Current, DACI 5
BIT NAME
15
TABLE 3. CHARGE CURRENT (REGISTER 0x14) (10mΩ SENSE RESISTOR, RS2)
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
0 = Adds 0mA of charger current.
1 = Adds 128mA of charger current.
0 = Adds 0mA of charger current.
1 = Adds 256mA of charger current.
0 = Adds 0mA of charger current.
1 = Adds 512mA of charger current.
0 = Adds 0mA of charger current.
1 = Adds 1024mA of charger current.
0 = Adds 0mA of charger current.
1 = Adds 2048mA of charger current.
0 = Adds 0mA of charger current.
1 = Adds 4096mA of charger current, 8064mA max.
Not used.
Not used.
Not used.
ISL88731C
and the charger is disabled. To start the charger, write valid
numbers to the ChargeVoltage and ChargeCurrent registers. The
ChargeCurrent register uses the Write-Word protocol (Figure 21).
The register code for ChargeCurrent is 0x14 (0b00010100).
Table 3 shows the mapping between the charge current set point
and the ChargeCurrent number. The ChargeCurrent register can
be read back to verify its contents.
The ISL88731C includes a fault limiter for low battery conditions.
If the battery voltage is less than 2.5V, the charge current is
temporarily set to 128mA. The ChargeCurrent register is
preserved and becomes active again when the battery voltage is
higher than 2.7V. This function effectively provides a foldback
current limit, which protects the charger during short circuit and
overload.
DESCRIPTION
February 8, 2011
FN6978.2

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