PS401-I/SS Microchip Technology, PS401-I/SS Datasheet - Page 26

• Manufacturer Part Number: PS401-I/SS
• Description: IC FUEL GAUGE BATTERY MGR 28SSOP
• Manufacturer: Microchip Technology

Specifications of PS401-I/SS

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PS401
TABLE 8-2:
DS40238B-page 26
NullCurr
PowerCalcVolt
PowerEmptyVolt
PowerVoltLimit
PwrConsumption
SelfdischrgErr
Parameter
Name
CAPACITY CALCULATIONS (CONTINUED)
Loc.
OTP
OTP
OTP
OTP
EE
EE
# Bytes
1
2
1
2
2
2
Lower
Limit
0
0
0
0
0
0
Upper
65535
65535
65535
65535
Limit
255
255
Typical
15602
15000
Value
9300
77
3
0
A zero zone control is built into the PS401
so that any small inaccuracy doesn't
actually drain the gas gauge, when in fact
the current is zero. For this reason, current
less than NullCurr mA in either direction will
be measured as zero.
Used for power calculations early in the
voltage curve, this is typically a mid-point
voltage level that will approximate the flat
part of the voltage curve as a straight line.
Voltage used for power calculation. This is
the pack voltage when the pack is empty.
Typically, this will be the cell empty voltage
Vempty times the number of cells. This is
used in the steep part of the voltage curve to
approximate a straight line.
Voltage for power calculations. VPOWER is
cutoff voltage that decides which formula to
use when converting mAh to mWh.
If the battery voltage is V, then
If V > PowerVoltLimit, mWh = mAh *
(V + PowerVolt) / 2.
If V < PowerVoltLimit, mWh = mAh *
(V + PowerEmptyVolt) / 2.
Current consumption of the battery module.
This is the average current that the battery
module typically draws from the battery
(255 = 1 mA).
Self-discharge error. This is the error
inherent in the ability of the self-discharge
lookup tables to meet actual battery
characteristics, 255 = 100%.
Operational Description
 2003 Microchip Technology Inc.