ISL6295CVZ Datasheet, PDF (21/25 Pages) Intersil Corporation – Low Voltage Fuel Gauge

ISL6295
Register Initialization
During the Power-on Reset sequence, all registers are
loaded with initial values from EEPROM locations
0x020-0x087. These EEPROM locations are reserved to
contain register initialization values. In a battery pack
application, a Power-on Reset typically happens only at the
time of pack manufacture, when the cells are first connected
to the battery monitoring PCB containing the ISL6295.
Data in the EEPROM locations 0:0x020-0:0x07F will be
loaded into the corresponding register locations
1:0x020-1:0x07F in Bank 1. Data in the EEPROM locations,
0:0x080-0:0x087 will be loaded into the corresponding Cal/
Setup register locations 2:0x080-2:0x087 in Bank 2. In all
cases, EEPROM register initialization locations
corresponding to “Reserved” register locations must contain
the value of 0x00h in order to insure proper operation
following a Power-on Reset.
Factory Register Initialization
The EEPROM register initialization locations are
programmed with a set of default values at the time that the
ISL6295 is manufactured. This programming results in the
following operational state following a Power-on Reset:
• All Accumulators and Time Counters disabled and reset to
zero
• All A/D Conversion disabled
• A/D registers programmed with zeroes
• Sample and Shelf-Sleep modes disabled
• All Sample-Sleep mode entry methods disabled and trip
point values reset to zero
• GPIO mode disabled on GPAD and NTC pins
• SMBus address = 0x26
• Factory calibrated trim values for bandgap, voltage
reference, and main and auxiliary oscillators.
Table 2 lists in detail the values that are programmed into the
EEPROM register initialization locations.
CAUTION: Some critical calibration and initialization data is
programmed into the EEPROM locations with default values at the
time of the ISL6295 manufacture. Any modification to these values
may cause incorrect operation or malfunction of the part. The
following table sumarises the critical control registers where the
default settings must be kept.
TABLE 2. CRITICAL CONTROL REGISTERS
Name
Address
Default Setting
SMB Address
0x80
0x26 (Bits 0-7)
(0 0 1 0 0 1 1 0)
7
0
Band Gap Trim
0x81
Factory Trimmed
Value
Voltage Reference
Trim
0x82
Factory Trimmed
Value
Main Oscillator
0x83
Factory Trimmed
Value
clkTM
(Clock Test Mode)
0x84
0x00
Test Mux
0x85
0x00
Aux Oscillator
0x86
Factory Trimmed
Value
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21
FN9074.2
February 8, 2011