PS4160-4 Microchip Technology, PS4160-4 Datasheet - Page 4

• Manufacturer Part Number: PS4160-4
• Description: MODULE FUEL GAUGE LIION 4-CELL
• Manufacturer: Microchip Technology

Specifications of PS4160-4

• Module/board Type: Battery Manager Module
• Battery Type: Li-Ion
• For Use With/related Products: PS401
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification

PS4160
2.0
2.1
The module fuel gauge provides State-of-Charge
(SOC) and battery status data in accordance with the
SMBus standards version 1.1. The PS401 monitors the
cell voltages, battery temperature, and current to deter-
mine SOC and battery status. The State-of-Charge
calculations are compensated for cell self discharge.
The remaining time calculation is compensated for
temperature and discharge rate. The parameters for
determining battery status flags and alarm thresholds
are all programmable as is the battery design capacity
and the battery performance model data. Please refer
to the PS401 Single Chip Battery Manager Data Sheet
(DS40238) for details on configuring the PS401.
2.2
The primary safety circuit provides cell protection from
conditions of overcharge, overdischarge and over-
current. Analog IC MM1414DV from Mitsumi measures
individual cell voltages and voltage across the
discharge FET. These values are compared against
internal reference values and the gates of two
P-channel power MOSFETs are controlled based on
the comparison results.
2.3
A secondary level of safety protection is provided on
the PS4160. GPIO<6> (pin 4) of the PS401, with R25
removed and bit 2 of FLAGS1 = 0, is programmed to
provide backup overcharge protection and is activated
in the case of pack over voltage, over temperature or
charge over current. In the situation where the param-
eter being monitored is the same as that of the
MM1414 the limits are set beyond those of the
MM1414. This means that the secondary protection is
triggered only in the event the primary protection fails
to activate.
DS40235B-page 4
FUNCTIONAL DESCRIPTION
PS401 Fuel Gauge
Primary Safety
Secondary Safety
2.4
The third level of safety protection is activated by
GPIO<7> (pin 5) of the PS401 when R23 is removed
and bit 2 of FLAGS1 = 0. This pin is activated whenever
any individual cell voltage is measured above a pro-
grammable limit that is beyond both the primary and
secondary safety limits. An N-channel MOSFET is
turned on and allows current to pass through the resis-
tive heater section of a fuse. This heating opens the
fuse, permanently disabling the pack from further
charge or discharge.
2.5
To write to the OTP EPROM, an additional voltage
(V
voltage can be obtained from the PowerInfo board and
applied to the PS4160 at connection VP (small thru-
hole) located on the small edge of the board opposite
the connector edge. Then use the utilities located on
the PS OTP page of the PowerTool software to write
new values to the PS401 OTP EPROM.
2.6
The PS4160 features four additional pins, GPIO<3:0>
(pins 24-27), which are used to drive the LED SOC
display. GPIO<5> (pin 3), is connected to the switch
which activates the LED display. Alternately, these
GPIOs may be used for other purposes by removing
the unused LEDs, programming the pins appropriately,
and using the adjacent test points to monitor the pins.
3.0
PCB schematics and bill of materials are included
here for
schematic and BOM, please visit the Microchip web
site (www.microchip.com).
PP
) must be applied to the PS401. This programming
Ultimate Safety
OTP EPROM Programming
Programmable I/Os
BOARD DESCRIPTION
completeness.
 2003 Microchip Technology Inc.
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