PS810 Datasheet, PDF (1/46 Pages) Microchip Technology – Li Ion Single Cell Fuel Gauge

PS810
Li Ion Single Cell Fuel Gauge
Hardware Features
• Highly accurate fuel gauge for single cell Li Ion
applications
• Algorithms are implemented using an embedded
PIC18 low-power microcontroller with 16-bit
instruction set
• Reports current, voltage and temperature utilizing a
programmable 8 to15-bit + sign, sigma-delta ADC
• Host communication accomplished through an
industry standard SMBus interface or an
alternative single pin serial interface
• I/O pins are available to provide functions such as
digital GPIO, coin cell voltage measurement and
thermistor input
• Integrated temperature sensor and regulator
minimize external components
• Embedded fuel gauge algorithms and application
specific parameters are stored in a 4K x 16 Flash
memory
• 512 bytes of RAM are available for temporary
storage of battery parameters
Software Features
• Provides battery status, such as average time to empty,
relative State-Of-Charge and battery State-Of-Health
• In-system offset calibration compensates for
offset error in current measurement
Package Features
• 16-pin QFN package or 14-pin TSSOP package
• -20°C to +85°C operating temperature range
1.0 PRODUCT OVERVIEW
The PS810 is a fuel gauge for one-cell Li Ion or Li Poly-
mer applications. The device provides the host and the
system user with critical battery information, such as
voltage, current, temperature, run time, State-Of-Charge
and State-Of-Health. This information is available
through an industry standard SMBus or an alternative
Single Pin Serial interface. Advanced fuel gauge
algorithms are stored in on-board Flash memory and
executed by the industry recognized PIC18 micro-
controller. These algorithms include compensation
factors which optimize the performance of the battery for
a specific application and operating environment.
Compensation is included for the effects of temperature,
discharge rate, charge rate and battery aging.
Pin Description
16-pin QFN (4 mm x 4 mm)
NTC/IO2
VCOIN/IO3
VFILTER
MCLR
16 15 14 13
1
12
2
3
11
PS810 ₁₀
4
9
56 78
IO5
IO4
GND
SR
14-pin TSSOP
SCL/IO0 1
IO1 2
NTC/IO2 3
VCOIN/IO3 4
VFILTER 5
MCLR 6
VC1 7
14 ^SDA/SPS
13 ^IO6
12 ^IO5
11 ^IO4
10 ^GND
9 ^SR
8 ^ROSC
To provide precise measurements of current, voltage and
temperature, the PS810 integrates a highly accurate
15-bit + sign, sigma-delta A/D converter. Based upon
operating conditions, this programmable converter can be
configured to measure specific battery parameters with a
resolution of 8 to 15 bits + sign. Precision measurements
combined with advanced algorithms provide accurate
indications of capacity, run time, State-Of-Health and
safety and charge/discharge conditions.
The ability to operate directly from a single Li Ion or Li
Polymer cell minimizes the need for external compo-
nents, such as a voltage regulator and voltage divider.
To further limit external circuitry and enhance accuracy,
the PS810 provides an integrated temperature sensor
and oscillator.
© 2006 Microchip Technology Inc.
DS21904C-page 1